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Copyright© 2023 RIGOL TECHNOLOGIES CO., LTD. All Rights Reserved.
Trademark Information
RIGOL®is the trademark of RIGOL TECHNOLOGIES CO., LTD.
Notices•

RIGOL products are covered by P.R.C. and foreign patents, issued and pending.

•

RIGOL reserves the right to modify or change parts of or all the specifications and pricing
policies at the company's sole decision.

•

Information in this publication replaces all previously released materials.

•

Information in this publication is subject to change without notice.

•

RIGOL shall not be liable for either incidental or consequential losses in connection with thefurnishing, use, or performance of this manual, as well as any information contained.

•

Any part of this document is forbidden to be copied, photocopied, or rearranged without priorwritten approval of RIGOL.

Product Certification
RIGOL guarantees that this product conforms to the national and industrial standards in China as
well as the ISO9001:2015 standard and the ISO14001:2015 standard. Other international standard
conformance certifications are in progress.
Contact Us
If you have any problem or requirement when using our products or this manual, please contact
RIGOL.
E-mail: service@rigol.com
Website: http://www.rigol.com

Section

Description

Page

List of Figures.............................................................................................................................. VII
List of Tables.................................................................................................................................XII
1 Safety Requirement.........................................................................................................1

1.1 General Safety Summary.................................................................................................................. 1

1.2 Safety Notices and Symbols............................................................................................................ 2

1.3 Measurement Category.....................................................................................................................3

1.4 Ventilation Requirement................................................................................................................... 4

1.5 Working Environment........................................................................................................................ 4

1.6 Care and Cleaning............................................................................................................................... 6

1.7 Environmental Considerations

2 Product Features.............................................................................................................. 7

3 Document Overview
4 Quick Start........................................................................................................6....................................................................................................... 8........................................................................................................................10

4.1 General Inspection............................................................................................................................10

4.2 Appearance and Dimensions
4.3 To Prepare for Use........................................................................................................ 10.............................................................................................................................11

4.3.1 To Adjust the Supporting Legs........................................................................................11

4.3.2 To Connect to Power...........................................................................................................124.3.3 Turn-on Checkout................................................................................................................ 12

4.3.4 To Set the System Language............................................................................................ 13

4.3.5 To Connect the Probe......................................................................................................... 13

4.3.6 Function Inspection.............................................................................................................14

4.3.7 Probe Compensation.......................................................................................................... 15

4.4 Product Overview..............................................................................................................................16

4.4.1 Front Panel Overview..........................................................................................................17

4.4.2 Rear Panel Overview........................................................................................................... 23

4.4.3 User Interface Overview
4.5 Touch Screen Gestures.................................................................................................... 24.................................................................................................................... 26

4.5.1 Tap............................................................................................................................................. 27

4.5.2 Drag.......................................................................................................................................... 27

4.5.3 Pinch&Stretch........................................................................................................................28

4.6 Parameter Setting Method............................................................................................................ 29

4.7 To Use the Security Lock.................................................................................................................34

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DHO800 User GuideI

4.8 To Use the Built-in Help System

5 Vertical System...................................................................................................35............................................................................................................... 36

5.1 To Enable or Disable the Analog Channel
5.2 To Adjust the Vertical Scale........................................................................................................... 37

5.3 To Adjust the Vertical Offset..........................................................................................................39

5.4 To Specify Channel Coupling........................................................................................................ 40

5.5 To Specify Bandwidth Limit........................................................................................................... 40

5.6 To Specify Input Impedance..........................................................................................................41

5.7 To Invert a Waveform
5.8 To Set Probe...................................................................................................................... 41........................................................................................................................................42

5.9 To Specify the Amplitude Unit
5.10 To Adjust Bias......................................................................................................44..................................................................................................................................... 44

5.11 To Specify the Skew..........................................................................................................................45

5.12 To Turn the Channel Label Display On/Off

6 Horizontal System...............................................................................45......................................................................................................... 47

6.1 To Adjust the Horizontal Time Base........................................................................................... 47

6.2 To Adjust the Horizontal Position................................................................................................48

6.3 Zoom Mode (Delayed Sweep)......................................................................................................49

7 Acquisition System........................................................................................................51

7.1 Acquisition Mode..............................................................................................................................51

7.2 Sampling Mode................................................................................................................................. 53

7.3 Sample Rate........................................................................................................................................ 54

7.4 Memory Depth...................................................................................................................................55

7.5 Horizontal Expansion Reference.................................................................................................. 56

7.6 Roll Mode.............................................................................................................................................57

7.7 XY Mode...............................................................................................................................................57

8 Triggering the Oscilloscope....................................................................................... 61

8.1 Trigger Source.................................................................................................................................... 61

8.2 Trigger Level........................................................................................................................................62

8.3 Trigger Mode...................................................................................................................................... 62

8.4 Trigger Coupling................................................................................................................................64

8.5 Trigger Holdoff...................................................................................................................................64

8.6 Noise Rejection..................................................................................................................................65

8.7 Trigger Type.........................................................................................................................................65

8.7.1 Edge Trigger...........................................................................................................................66

8.7.2 Pulse Width Trigger
8.7.3 Slope Trigger
DHO800 User Guide
II................................................................................ 36.............................................................................................................67..........................................................................................................................70
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8.7.4 Video Trigger......................................................................................................................... 73

8.7.5 Pattern Trigger.......................................................................................................................75

8.7.6 Duration Trigger................................................................................................................... 78

8.7.7 Timeout Trigger.................................................................................................................... 81

8.7.8 Runt Trigger........................................................................................................................... 83

8.7.9 Window Trigger
8.7.10 Delay Trigger.................................................................................................................... 85..........................................................................................................................87

8.7.11 Setup/Hold Trigger..............................................................................................................90

8.7.12 Nth Edge Trigger.................................................................................................................. 92

8.7.13 RS232 Trigger........................................................................................................................ 95

8.7.14 I2C Trigger.............................................................................................................................. 97

8.7.15 SPI Trigger............................................................................................................................ 101

8.8 Trigger Output Connector

9 Math Operation........................................................................................................... 104........................................................................................................... 105

9.1 Arithmetic Operation.....................................................................................................................106

9.2 Function Operation........................................................................................................................109

9.3 FFT Operation.................................................................................................................................. 113

9.4 Logic Operation...............................................................................................................................118

9.5 Digital Filter...................................................................................................................................... 121

10 Measurements..............................................................................................................126

10.1 Auto Scale......................................................................................................................................... 126

10.2 Auto Measurements...................................................................................................................... 127

10.2.1 Measurement Parameter.................................................................................................127

10.2.1.1 Time Parameters................................................................................................ 127

10.2.1.2 Count Values....................................................................................................... 128

10.2.1.3 Delay and Phase Parameters......................................................................... 130

10.2.1.4 Voltage Parameters...........................................................................................132

10.2.1.5 Other Parameters...............................................................................................133

10.2.2 Select the Measurement Item
10.2.3 Measurement Settings....................................................................................... 134.....................................................................................................136

10.2.4 Remove the Measurement Results..............................................................................139

10.3 Cursor Measurements...................................................................................................................140

10.3.1 Manual Mode......................................................................................................................142

10.3.2 Track Mode.......................................................................................................................... 144

10.3.3 XY Mode............................................................................................................................... 147

11 Digital Voltmeter (DVM) and Frequency Counter11.1 Digital Voltmeter (DVM)............................................149...............................................................................................................149

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DHO800 User GuideIII11.1.1 Measurement Settings.....................................................................................................149

11.1.2 Remove the Measurement
11.2 Frequency Counter............................................................................................. 151.........................................................................................................................151

11.2.1 Measurement Settings
11.2.2 Reset Statistics.....................................................................................................152.................................................................................................................... 153

11.2.3 Remove the Measurement

12 Histogram Analysis............................................................................................. 153.....................................................................................................154

12.1 To Enable or Disable the Histogram Function...................................................................... 154

12.2 To Select the Histogram Type.....................................................................................................155

12.3 To Select the Histogram Source................................................................................................ 155

12.4 To Set the Histogram Height...................................................................................................... 155

12.5 To Set the Histogram Range.......................................................................................................156

12.6 Histogram Analysis Results......................................................................................................... 156

12.7 To Remove Results..........................................................................................................................158

12.8 To Clear Statistics............................................................................................................................ 158

13 Reference Waveform..................................................................................................159

13.1 To Enable Ref Function................................................................................................................. 159

13.2 To Set the Reference Waveform................................................................................................ 159

13.3 To Set the Ref Waveform Display..............................................................................................160

13.4 Export and Import Operation

14 Pass/Fail Test.....................................................................................................161................................................................................................................. 163

14.1 To Enable or Disable the Pass/Fail Test Function
14.2 To Select the Source...................................................................................................................... 164

14.3 To Create a Mask.............................................................................................................................164

14.4 To Set the Output Form of the Test Results...........................................................................165

14.5 To Start or Stop the Pass/Fail Test Operation........................................................................166

14.6 To Display the Statistics of the Test Results...........................................................................166

15 Protocol Decoding......................................................................................................168

15.1 Parallel Decoding............................................................................................................................168

15.1.1 Clock Setting (CLK)
15.1.2 Bus Setting............................................................................................................169........................................................................................................................... 170

15.1.3 Display-related Settings.................................................................................................. 171

15.1.4 Event Table........................................................................................................................... 171

15.2 RS232 Decoding..............................................................................................................................172

15.2.1 Source Setting.....................................................................................................................174

15.2.2 To Set Data Package
15.2.3 Display-related Settings
DHO800 User Guide
IV.................................................................164......................................................................................................... 175.................................................................................................. 175
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15.2.4 Event Table
15.3 I2C Decoding........................................................................................................................... 176....................................................................................................................................177

15.3.1 Source Setting.....................................................................................................................178

15.3.2 Display-related Settings
15.3.3 Event Table
15.4 SPI Decoding.................................................................................................. 178........................................................................................................................... 179....................................................................................................................................180

15.4.1 To Set the Source...............................................................................................................181

15.4.2 To Set Mode and Data..................................................................................................... 182

15.4.3 Display-related Settings.................................................................................................. 183

15.4.4 Event Table........................................................................................................................... 183

16 Multi-pane Windowing............................................................................................. 185

17 Waveform Recording and Playing.........................................................................18717.1 Common Settings...........................................................................................................................18717.2 Record Options................................................................................................................................188

17.3 Play Options..................................................................................................................................... 189

18 Search and Navigation
18.1 Search.............................................................................................. 192................................................................................................................................................. 192

18.2 Navigation.........................................................................................................................................194

19 Display Control.............................................................................................................198

19.1 Display Type......................................................................................................................................198

19.2 Persistence Time............................................................................................................................. 198

19.3 Waveform Intensity........................................................................................................................199

19.4 To Set the Screen Grid...................................................................................................................199

19.5 Display Settings...............................................................................................................................199

19.6 Show Scale........................................................................................................................................ 200

19.7 Color Grade.......................................................................................................................................200

19.8 Waveform Freeze

20 Store and Load............................................................................................................................ 200............................................................................................................. 201

20.1 To Enter the Storage Menu
20.2 To Save a File......................................................................................................... 201....................................................................................................................................201

20.2.1 To Save Image.....................................................................................................................201

20.2.2 To Save Wave...................................................................................................................... 203

20.2.3 Save Setup............................................................................................................................205

20.2.4 Binary Data Format (.bin)
20.3 To Load a File................................................................................................206....................................................................................................................................209

20.4 Firmware Upgrade..........................................................................................................................210

20.5 Disk Management.......................................................................................................................... 211

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DHO800 User Guide
V21 System Utility Function Setting.............................................................................. 214

21.1 I/O Setting.........................................................................................................................................21421.2 Basic Settings................................................................................................................................... 216

21.3 About this Oscilloscope................................................................................................................218

21.4 Other Settings..................................................................................................................................219

21.5 Auto Config.......................................................................................................................................219

21.6 SelfCal................................................................................................................................................. 220

21.7 Option List.........................................................................................................................................22021.8 Quick Action Settings
21.9 Self-check....................................................................................................................220.......................................................................................................................................... 223

22 Remote Control............................................................................................................224

22.1 Remote Control via USB............................................................................................................... 225

22.2 Remote Control via LAN...............................................................................................................225

23 Troubleshooting
24 Appendix...........................................................................................................227........................................................................................................................ 228

24.1 Appendix A: Options and Accessories
24.2 Appendix B: Warranty................................................................................................................... 228

24.3 Appendix C: Factory Settings

DHO800 User Guide
VI.................................................................................... 228..................................................................................................... 229

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List of Figures
Figure 4.1 Front View ..............................................................................................................10
Figure 4.2 Side View ................................................................................................................11
Figure 4.3 Adjusting the Supporting Legs ...................................................................... 11
Figure 4.4 To Connect to Power ..........................................................................................12
Figure 4.5 Connecting the Passive Probe ........................................................................14
Figure 4.6 Using the Compensation Signal .................................................................... 15
Figure 4.7 Square Waveform Signal .................................................................................. 15
Figure 4.8 Probe Compensation .........................................................................................16
Figure 4.9 Front Panel (2-channel Model) .......................................................................17
Figure 4.10 Front Panel (4-channel Model) .................................................................... 17
Figure 4.11 Rear Panel ............................................................................................................23
Figure 4.12 User Interface .....................................................................................................24
Figure 4.13 Tap Gesture .........................................................................................................27
Figure 4.14 Drag Gesture ...................................................................................................... 28
Figure 4.15 Pinch&Stretch Gesture ....................................................................................28
Figure 4.16 English Input Interface ....................................................................................29
Figure 4.17 Chinese Input Interface .................................................................................. 31
Figure 4.18 String Keypad .....................................................................................................32
Figure 4.19 Numeric Keypad ................................................................................................33
Figure 4.20 To Use the Security Lock ................................................................................ 34
Figure 5.1 Vertical Menu ....................................................................................................... 36
Figure 5.2 Waveform Invert On/Off .................................................................................. 42
Figure 5.3 Probe Setting Menu ...........................................................................................42
Figure 5.4 Zero Offset ............................................................................................................ 45
Figure 6.1 Horizontal Menu ................................................................................................. 47
Figure 6.2 Zoom Mode .......................................................................................................... 50
Figure 7.1 Horizontal Menu ................................................................................................. 51
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DHO800 User Guide
VIIFigure 7.2 Display Modes ......................................................................................................53
Figure 7.3 Memory Depth .................................................................................................... 55
Figure 7.4 XY Menu .................................................................................................................58
Figure 7.5 Measurement Schematic Diagram of Phase Deviation ......................... 59
Figure 8.1 Schematic Diagram of the Acquisition Memory ......................................63
Figure 8.2 Trigger Holdoff .....................................................................................................65
Figure 8.3 Edge Trigger Setting Menu ..............................................................................66
Figure 8.4 Positive/Negative Pulse Width .......................................................................68
Figure 8.5 Pulse Width Trigger Setting Menu ................................................................68
Figure 8.6 Positive Slope Time/Negative Slope Time ................................................. 70
Figure 8.7 Slope Trigger Setting Menu ............................................................................ 71
Figure 8.8 Video Trigger Setting Menu ............................................................................73
Figure 8.9 Pattern Trigger ..................................................................................................... 76
Figure 8.10 Pattern Trigger Setting Menu .......................................................................76
Figure 8.11 Duration Trigger ................................................................................................78
Figure 8.12 Duration Trigger Setting Menu ....................................................................79
Figure 8.13 Timeout Trigger .................................................................................................81
Figure 8.14 Timeout Trigger Menu ....................................................................................81
Figure 8.15 Runt Trigger ........................................................................................................83
Figure 8.16 Runt Trigger Setting Menu ............................................................................83
Figure 8.17 Window Trigger Setting Menu .....................................................................85
Figure 8.18 Delay Trigger ...................................................................................................... 87
Figure 8.19 Delay Trigger Setting Menu ..........................................................................88
Figure 8.20 Setup/Hold Trigger .......................................................................................... 90
Figure 8.21 Setup/Hold Trigger Setting Menu .............................................................. 91
Figure 8.22 Nth Edge Trigger ...............................................................................................93
Figure 8.23 Nth Edge Trigger Setting Menu .................................................................. 93
Figure 8.24 Schematic Diagram of RS232 Protocol ..................................................... 95
Figure 8.25 RS232 Trigger Setting Menu .........................................................................95
DHO800 User Guide
VIII

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Figure 8.26 Sequence Diagram of I2C Protocol ............................................................ 98
Figure 8.27 I2C Trigger Setting Menu ...............................................................................98
Figure 8.28 Binary Format Setting ...................................................................................100
Figure 8.29 Hexadecimal Format Setting ......................................................................100
Figure 8.30 Sequential Chart of SPI Bus ........................................................................101
Figure 8.31 SPI Trigger Setting Menu ............................................................................ 102
Figure 9.1 Math Menu ......................................................................................................... 105
Figure 9.2 Waveform Display Window of the Operation Results ......................... 106
Figure 9.3 Arithmetic Operation Menu ..........................................................................107
Figure 9.4 Operation Result Display Window ..............................................................107
Figure 9.5 Function Operation Menu .............................................................................110
Figure 9.6 Operation Result Display Window ..............................................................111
Figure 9.7 FFT Operation Menu ....................................................................................... 114
Figure 9.8 FFT Operation Window .................................................................................. 114
Figure 9.9 Peak Search .........................................................................................................117
Figure 9.10 Logic Operation Menu ................................................................................. 118
Figure 9.11 Operation Result Display Window ........................................................... 120
Figure 9.12 Digital Filter Menu ......................................................................................... 122
Figure 9.13 Operation Result Display Window ........................................................... 123
Figure 10.1 Time Parameters .............................................................................................127
Figure 10.2 Delay and Phase Parameters ......................................................................130
Figure 10.3 Voltage Parameters ....................................................................................... 132
Figure 10.4 Vertical Measurement Items ...................................................................... 134
Figure 10.5 Horizontal Measurement Items ................................................................ 135
Figure 10.6 Other Measurement Items ..........................................................................135
Figure 10.7 Measurement Settings Menu .................................................................... 136
Figure 10.8 Cursors ...............................................................................................................140
Figure 10.9 Manual Mode Setting Menu ......................................................................142
Figure 10.10 Manual Cursor Measurement Example ................................................144
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DHO800 User Guide
IX

Figure 10.11 Track Mode Setting Menu ........................................................................ 145
Figure 10.12 Track Measurement (before Horizontal Expansion) ........................ 146
Figure 10.13 Track Measurement (after Horizontal Expansion) ............................ 147
Figure 10.14 XY Mode Setting Menu ............................................................................. 147
Figure 11.1 DVM Setting Menu ........................................................................................150
Figure 11.2 Frequency Counter Setting Menu ............................................................ 152
Figure 12.1 Histogram Menu ............................................................................................ 154
Figure 12.2 Histogram Analysis Interface ..................................................................... 155
Figure 12.3 Histogram Analysis Results .........................................................................157
Figure 13.1 Reference Waveform Menu ........................................................................159
Figure 14.1 PassFail Menu .................................................................................................. 163
Figure 14.2 PassFail Menu-Simplified ............................................................................ 163
Figure 14.3 Pass/Fail Test Interface ................................................................................. 166
Figure 15.1 Schematic Diagram of Parallel Decoding .............................................. 168
Figure 15.2 Parallel Decoding Menu .............................................................................. 169
Figure 15.3 Parallel Decoding Event Table ....................................................................172
Figure 15.4 Schematic Diagram of RS232 Serial Bus ................................................ 173
Figure 15.5 RS232 Decoding Menu ................................................................................ 173
Figure 15.6 RS232 Decoding Event Table ..................................................................... 176
Figure 15.7 I2C Serial Bus ................................................................................................... 177
Figure 15.8 I2C Decoding Menu ...................................................................................... 177
Figure 15.9 I2C Decoding Event Table ........................................................................... 179
Figure 15.10 SPI Serial Bus .................................................................................................180
Figure 15.11 SPI Decoding Menu .................................................................................... 181
Figure 15.12 SPI Decoding Event Table ......................................................................... 184
Figure 16.1 "Add Window" Menu ....................................................................................185
Figure 17.1 "Record" Menu ................................................................................................187
Figure 17.2 Minimized "Play" Menu ............................................................................... 190
Figure 18.1 Search Menu ....................................................................................................192
DHO800 User GuideX

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Figure 18.2 MarkTable Display ..........................................................................................194
Figure 18.3 Navigation Menu ........................................................................................... 195
Figure 18.4 Simplified Navigation Menu ...................................................................... 195
Figure 18.5 "Search Event" Navigation Setting Menu ..............................................196
Figure 18.6 "Frame Segment" Navigation Setting Menu ........................................196
Figure 19.1 Display Setting Menu ................................................................................... 198
Figure 20.1 Image Saving Setting Menu .......................................................................202
Figure 20.2 Waveform Saving Setting Menu ...............................................................204
Figure 20.3 Setup Saving Setting Menu ........................................................................205
Figure 20.4 Load Setting Menu ........................................................................................ 210
Figure 20.5 Upgrade Menu ................................................................................................211
Figure 20.6 Disk Management Interface .......................................................................212
Figure 21.1 Self-calibration Menu ................................................................................... 220
Figure 21.2 Quick Menu ......................................................................................................221

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DHO800 User Guide
XIList of Tables
Table 4.1 Power Adaptor Specifications ...........................................................................12
Table 5.1 Probe Ratio ..............................................................................................................43
Table 8.1 Video Standard ...................................................................................................... 74
Table 9.1 Window Function ................................................................................................116
Table 9.2 Logic Operation .................................................................................................. 119
Table 15.1 Bus Setting ..........................................................................................................170
Table 20.1 BIN File Format ................................................................................................. 206
Table 20.2 File Header ..........................................................................................................207
Table 20.3 Waveform Header ............................................................................................207
Table 20.4 Waveform Data Header ................................................................................. 209
Table 24.2 Factory Settings ................................................................................................ 229

DHO800 User Guide
XII

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Safety Requirement

1

Safety Requirement

1.1

General Safety Summary
Please review the following safety precautions carefully before putting the instrument
into operation so as to avoid any personal injury or damage to the instrument andany product connected to it. To prevent potential hazards, please follow the
instructions specified in this manual to use the instrument properly.
•

Use Proper Power Cord.
Only the exclusive power cord designed for the instrument and authorized foruse within the destination country could be used.

•

Connect the Probe Correctly.
If a probe is used, the probe ground lead must be connected to earth ground.
Do not connect the ground lead to high voltage. Improper way of connection
could result in dangerous voltages being present on the connectors, controls orother surfaces of the oscilloscope and probes, which will cause potential hazards
for operators.

•

Observe All Terminal Ratings.
To avoid fire or shock hazard, observe all ratings and markers on the instrument
and check your manual for more information about ratings before connecting
the instrument.

•

Use Proper Overvoltage Protection.
Ensure that no overvoltage (such as that caused by a bolt of lightning) can reachthe product. Otherwise, the operator might be exposed to the danger of anelectric shock.

•

Do Not Operate Without Covers.
Do not operate the instrument with covers or panels removed.

•

Do Not Insert Objects into the Air Outlet.
Do not insert objects into the air outlet, as doing so may cause damage to the
instrument.

•

Avoid Circuit or Wire Exposure.
Do not touch exposed junctions and components when the instrument is
powered on.

•

Do Not Operate With Suspected Failures.
If you suspect that any damage may occur to the instrument, have it inspected
by RIGOL authorized personnel before further operations. Any maintenance,

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DHO800 User Guide
1

Safety Requirement

adjustment or replacement especially to circuits or accessories must be
performed by RIGOL authorized personnel.
•

Provide Adequate Ventilation.
Inadequate ventilation may cause an increase of temperature in the instrument,
which would cause damage to the instrument. So please keep the instrument
well ventilated and inspect the air outlet and the fan regularly.

•

Do Not Operate in Wet Conditions.
To avoid short circuit inside the instrument or electric shock, never operate theinstrument in a humid environment.

•

Do Not Operate in an Explosive Atmosphere.
To avoid personal injuries or damage to the instrument, never operate theinstrument in an explosive atmosphere.

•

Keep Instrument Surfaces Clean and Dry.
To avoid dust or moisture from affecting the performance of the instrument,
keep the surfaces of the instrument clean and dry.

•Prevent Electrostatic Impact.
Operate the instrument in an electrostatic discharge protective environment toavoid damage induced by static discharges. Always ground both the internal andexternal conductors of cables to release static before making connections.

•

Use the Battery Properly.
Do not expose the battery (if available) to high temperature or fire. Keep it out of
the reach of children. Improper change of a battery (lithium battery) may cause
an explosion. Use the RIGOL specified battery only.

•

Handle with Caution.
Please handle with care during transportation to avoid damage to keys, knobs,
interfaces, and other parts on the panels.

WARNING
Equipment meeting Class A requirements may not offer adequate protection to broadcast
services within residential environment.

1.2

Safety Notices and Symbols
Safety Notices in this Manual:
WARNING
Indicates a potentially hazardous situation or practice which, if not avoided, will result inserious injury or death.

DHO800 User Guide
2

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Safety Requirement

CAUTION
Indicates a potentially hazardous situation or practice which, if not avoided, could resultin damage to the product or loss of important data.

Safety Notices on the Product:•

DANGER
It calls attention to an operation, if not correctly performed, could result in injury
or hazard immediately.

•WARNING
It calls attention to an operation, if not correctly performed, could result in
potential injury or hazard.

•

CAUTIONIt calls attention to an operation, if not correctly performed, could result indamage to the product or other devices connected to the product.

Safety Symbols on the Product:

1.3

Hazardous

Safety Warning Protective Earth Chassis Ground

Voltage

Terminal

Test Ground

Measurement Category
Measurement Category
This instrument can make measurements in Measurement Category I.
WARNING
This instrument can only be used for measurements within its specified measurement
categories.

Measurement Category Definitions•

Measurement category I is for measurements performed on circuits not directly
connected to MAINS. Examples are measurements on circuits not derived from
MAINS, and specially protected (internal) MAINS derived circuits. In the latter
case, transient stresses are variable. Thus, you must know the transient withstandcapability of the equipment.

•

Measurement category II is for measurements performed on circuits directly
connected to low voltage installation. Examples are measurements on household
appliances, portable tools and similar equipment.

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DHO800 User Guide
3

Safety Requirement•

Measurement category III is for measurements performed in the building
installation. Examples are measurements on distribution boards, circuit-breakers,
wiring (including cables, bus-bars, junction boxes, switches and socket-outlets) in
the fixed installation, and equipment for industrial use and some otherequipment. For example, stationary motors with permanent connection to a
fixed installation.

•

Measurement category IV is for measurements performed at the source of alow-voltage installation. Examples are electricity meters and measurements on
primary overcurrent protection devices and ripple control units.

1.4

Ventilation Requirement
This instrument uses a fan to force cooling. Please make sure that the air inlet andoutlet areas are free from obstructions and have free air. When using the instrument
in a bench-top or rack setting, provide at least 10 cm clearance beside, above andbehind the instrument for adequate ventilation.
CAUTION
Inadequate ventilation may cause an increase of temperature in the instrument, which
would cause damage to the instrument. So please keep the instrument well ventilated andinspect the air outlet and the fan regularly.

1.5

Working Environment
Temperature
Operating: 0℃ to +50℃
Non-operating: -30℃ to +60℃
Humidity•

Operating:
Below +30℃: ≤90%RH (without condensation)+30℃ to +40℃: ≤75% RH (without condensation)+40℃ to +50℃: ≤45%RH (without condensation)•

Non-operating:
Below +60℃: ≤90%RH (without condensation)

WARNINGTo avoid short circuit inside the instrument or electric shock, never operate theinstrument in a humid environment.

DHO800 User Guide
4

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Safety Requirement

Altitude•Operating: below 3 km•

Non-operating: below 15 km

Protection Level Against Electric ShockESD ±8kV
Installation (Overvoltage) Category
This product is powered by mains conforming to installation (overvoltage) category II.
WARNING
Ensure that no overvoltage (such as that caused by a bolt of lightning) can reach the
product. Otherwise, the operator might be exposed to the danger of an electric shock.

Installation (Overvoltage) Category Definitions
Installation (overvoltage) category I refers to signal level which is applicable toequipment measurement terminals connected to the source circuit. Among theseterminals, precautions are done to limit the transient voltage to a low level.
Installation (overvoltage) category II refers to the local power distribution level which
is applicable to equipment connected to the AC line (AC power).
Pollution Degree
Pollution Degree 2
Pollution Degree Definition•

Pollution Degree 1: No pollution or only dry, nonconductive pollution occurs.
The pollution has no effect. For example, a clean room or air-conditioned officeenvironment.

•

Pollution Degree 2: Normally only nonconductive pollution occurs. Temporaryconductivity caused by condensation is to be expected. For example, indoor
environment.

•

Pollution Degree 3: Conductive pollution or dry nonconductive pollution that
becomes conductive due to condensation occurs. To be found in industrial
environment or construction sites (harsh environments). For example, shelteredoutdoor environment.

•

Pollution Degree 4: The pollution generates persistent conductivity caused byconductive dust, rain, or snow. For example, outdoor areas.

Safety ClassClass 2

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Safety Requirement

1.6

Care and Cleaning
Care
Do not store or leave the instrument where it may be exposed to direct sunlight forlong periods of time.
Cleaning
Clean the instrument regularly according to its operating conditions.
1. Disconnect the instrument from all power sources.
2. Clean the external surfaces of the instrument with a soft cloth dampened with mild
detergent or water. Avoid having any water or other objects into the chassis via theheat dissipation hole. When cleaning the LCD, take care to avoid scarifying it.
CAUTION
To avoid damage to the instrument, do not expose it to caustic liquids.

WARNINGTo avoid short-circuit resulting from moisture or personal injuries, ensure that the
instrument is completely dry before connecting it to the power supply.

1.7

Environmental Considerations
The following symbol indicates that this product complies with the WEEE Directive
2002/96/EC.

The equipment may contain substances that could be harmful to the environment orhuman health. To avoid the release of such substances into the environment andavoid harm to human health, we recommend you to recycle this productappropriately to ensure that most materials are reused or recycled properly. Pleasecontact your local authorities for disposal or recycling information.
You can click on the following link https://int.rigol.com/services/services/declaration
to download the latest version of the RoHS&WEEE certification file.

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Product Features

2

Product Features
Product Features•

Ultra-low noise floor, purer signal, never miss the small signals•

Up to 12 bits resolution for all the models of this series•

Max. analog bandwidth of 100 MHz, 4 analog channels, external trigger output(std.) available for the dual-channel model•Max. real-time sample rate of 1.25 GSa/s•

Max. memory depth of 25 Mpts•

Vertical sensitivity range: 500 μV/div to 10 V/div•

Max. capture rate of 1,000,000 wfms/s (in UltraAcquire mode)•

Digital phosphor display with real-time 256-level intensity grading•

Waveform search and navigation function allows you to debug the signal
anomalies faster•7" (1024x600) capacitive multi-touch screen•

Brand new Flex Knob brings user-friendly experience•

USB Device & Host, LAN, and HDMI interfaces (std.) for all the models of thisseries•Novel and delicate industrial design, easy to operate•

Unique online upgrade

The DHO800 series is RIGOL's new launched high-performance economical digital
oscilloscope. Though compact in design, it has superior performance. It features acapture rate up to 1,000,000 wfms/s (in UltraAcquire Mode), 25 Mpts memory
depth, 12 bits resolution, and low noise.
The DHO800 series is a brand new economical digital oscilloscope designed for thevast mainstream digital oscilloscope market to meet their design, debugging, andtest demands.

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DHO800 User Guide
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Document Overview

3

Document Overview
This manual gives you a quick overview of the front and rear panel, user interface aswell as basic operation methods of DHO800 series.
TIP
For the latest version of this manual, download it from RIGOL official website (http://

www.rigol.com).

Publication Number
UGA36100-1110
Software Version
Software upgrade might change or add product features. Please acquire the latest
version of the manual from RIGOL website or contact RIGOL to upgrade the software.
Format Conventions in this Manual
1. KeyThe front panel key is denoted by the menu key icon. For example,
indicates the "Default" key.
2. Menu
The menu item is denoted by the format of "Menu Name (Bold) + Character
Shading" in the manual. For example, Setup indicates the "Setup" sub-menu underthe "Utility" function menu. You can click or tap Setup to access the "Setup" menu.
3. Operation Procedures
The next step of the operation is denoted by ">" in the manual. For example,> Storage indicates first clicking or tapping

and then clicking or tapping

Storage.
4. Connector
The front/rear panel connector is denoted by "Brackets + Connector Name (Bold)",
for example, [AUX OUT].
5. Knob
Label

Horizontal
POSITION

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Knob

Label

Horizontal Position
Knob

Knob
Multipurpose

1

Knob 1

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Document Overview

Label

Knob

Label

Knob

Horizontal Scale
Horizontal

SCALE

Multipurpose2

Knob

Knob 2

Vertical Position
VerticalPOSITION Knob
Vertical Scale

Vertical

SCALE

Knob

Trigger Level Knob

LEVEL
-

-

Content Conventions in this Manual
DHO800 series digital oscilloscope includes the following models. Four-channel
models and two-channel models share the same operation method. Unless otherwise
specified, this manual takes the four-channel model DHO814 as an example toillustrate the operation methods of DHO800 series oscilloscope.
Model

Max. Analog Bandwidth

No. of Analog Channels

DHO80270 MHz2+EXT

DHO80470 MHz4

DHO812100 MHz

2+EXT

DHO814100 MHz

4

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Quick Start

4

Quick Start

4.1

General Inspection
1. Inspect the packaging
If the packaging has been damaged, do not dispose the damaged packaging or
cushioning materials until the shipment has been checked for completeness andhas passed both electrical and mechanical tests.
The consigner or carrier shall be liable for the damage to the instrument resulting
from shipment. RIGOL would not be responsible for free maintenance/rework or
replacement of the instrument.
2. Inspect the instrument
In case of any mechanical damage, missing parts, or failure in passing the electricaland mechanical tests, contact your RIGOL sales representative.
3. Check the accessories
Please check the accessories according to the packing lists. If the accessories aredamaged or incomplete, please contact your RIGOL sales representative.
Recommended Calibration Interval
RIGOL suggests that the instrument should be calibrated every 18 months.

4.2

Appearance and Dimensions

161.75 mm

265.36 mm

Figure 4.1 Front View
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Quick Start

77.38 mmFigure 4.2 Side View

4.3

To Prepare for Use

4.3.1

To Adjust the Supporting Legs
Adjust the supporting legs properly to use them as stands to tilt the oscilloscope
upwards for stable placement of the oscilloscope as well as better operation andobservation. You can also fold the supporting legs when the instrument is not in use
for easier storage or shipment, as shown in the figure below.

Supporting Legs（a）Unfold the supporting legs（b）Fold the supporting legs

Figure 4.3 Adjusting the Supporting Legs

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4.3.2

To Connect to PowerThe power requirements of the oscilloscope are DC, 12 V, 4 A. Please use the power
adaptor provided in the accessories to connect the oscilloscope to the AC powersource (100 V to 240 V, 50 Hz to 60 Hz), as shown in the figure below.

Power Cord Connector

Figure 4.4 To Connect to Power

Table 4.1 Power Adaptor Specifications
Item

Description

Input

100 V to 240 V, 50 Hz to 60 Hz, 1.2 A Max

OutputDC, 12 V, 4 A, 48 W

CAUTION
The power adaptor provided in accessories can only be used to power RIGOL instruments.
Do not use it for mobile phone and other devices.

WARNINGTo avoid electric shock, ensure that the instrument is correctly grounded.

4.3.3

Turn-on Checkout
After the instrument is connected to the power source, press the power key

at thelower-left corner of the front panel to power on the instrument. During the start-up

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Quick Start

process, the instrument performs a series of self-tests. After the self-test, the splash
screen is displayed.
•

Restart: Click or tap> Restart. Then a prompt message "Are you sure to

reboot?" is displayed. Click or tap OK to restart the instrument.
•

Shutdown:-

Click or tap> Shutdown. Then a prompt message "Are you sure to

shutdown?" is displayed. Click or tap OK to shut down the instrument.
-

Press

and a prompt message "Are you sure to shutdown?" is displayed.

Click or tap OK to shut down the instrument.
-

Press

twice to shut down the instrument.

-

Press

for three seconds to shut down the instrument.

TIP
You can also click or tap> Utility > Setup and set the "Power status" to "Switch on". The

instrument powers on once connected to power.

4.3.4

To Set the System Language
This oscilloscope supports multiple languages. You can click or tap> Utility >Setup > Language to select the system language.

4.3.5

To Connect the Probe
RIGOL provides passive probes for DHO800 series. For specific probe models, refer to

DHO800 Data Sheet. For detailed technical information of the probes, please refer tothe corresponding Probe User Guide.
Connect the Passive Probe
1. Connect the BNC terminal of the probe to an analog channel input terminal of theoscilloscope on the front panel as shown in the figure below.
2. Connect the ground alligator clip or spring of the probe to the circuit groundterminal, and then connect the probe tip to the circuit point to be tested.

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Quick Start

Figure 4.5 Connecting the Passive Probe
After you connect the passive probe, check the probe function and probe
compensation adjustment before making measurements. For details, please refer toFunction Inspection and Probe Compensation.

4.3.6

Function Inspection
1. Press the front-panel

and a prompt message "Restore default settings?"

is displayed. Click or tap OK to restore the instrument to its factory default
settings.
2. Connect the ground alligator clip of the probe to the "Ground Terminal" as shownin Figure 4.6 .
3. Use the probe to connect the input terminal of CH1 and the "Compensation Signal
Output Terminal" of the probe, as shown in Figure 4.6 .

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Compensation Signal
Output Terminal
Ground Terminal

Figure 4.6 Using the Compensation Signal
4. Set the probe ratio based on the attenuation of the probe, and then click or tap> Auto.
5. Observe the waveform on the display. In normal condition, you should see asquare waveform similar to the waveform shown in the figure below.

Figure 4.7 Square Waveform Signal
6. Test the other channels in the same way. If you see the waveform, but the squarewave is not shaped correctly as shown above, perform the procedure described inProbe Compensation. If you do not see the waveform, perform those steps again.
WARNINGTo avoid electric shock when using the probe, please make sure that the insulated wire of
the probe is in good condition. Do not touch the metallic part of the probe when theprobe is connected to high voltage source.

4.3.7

Probe Compensation
When used for the first time, the oscilloscope probe must be compensated to matchthe input characteristics of the oscilloscope channel to which it is connected. The

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Quick Start

non-compensated or poorly compensated probe may cause measurement errors. The
compensation procedure is as follows:
1. Perform Step 1, 2, 3 and 4 in Function Inspection.
2. Check the displayed waveforms and compare them with the waveforms shown in

Figure 4.8 .

Over compensated

Perfectly compensated

Under compensatedFigure 4.8 Probe Compensation
3. Use the probe compensation adjustment tool provided in the accessories to adjust
the low-frequency compensation adjustment hole on the probe until the displayed
waveform is consistent with the "Perfectly compensated" waveform shown in theabove figure.

4.4

Product Overview
Unless otherwise specified, this chapter takes the four-channel model DHO814 as an
example to introduce the appearance and dimensions, front and rear panels, and userinterface of the DHO800 series oscilloscope.

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Quick Start

4.4.1

Front Panel Overview
1

3 4

2

5

6

7
8

9
10
11
12

16 15

13

14
Figure 4.9 Front Panel (2-channel Model)

1

3 4

2

5

6

7
8

9
10
11
12

16 15

14
Figure 4.10 Front Panel (4-channel Model)

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Quick Start

1. 7'' Capacitive Touch Screen
Displays the waveforms, menu labels, and parameter settings, system state,
prompt messages, and other information.
2. Multipurpose Knobs- Non-menu operation:
When not operating on the menu, you can rotate the knob 1 to adjust the
waveform brightness. When a cursor, decoding, Math waveform, or reference
waveform is added on the screen, you can rotate the multipurpose knob tomove the cursor (knob 1 and 2), adjust the decode threshold (knob 1) anddecode result display position (knob 2), adjust the vertical scale (knob 1) andvertical offset (knob 2) of the math/reference waveform. You can click or tap
Flex Knob on the Toolbar at the upper-right of the screen to set priority.
- Automatic: Cursor > Math/Ref/Decode > Intensity (default priority).
- Manual: all non-menu operation items are listed at the lower part of the Flex
Knob menu. You can select one of them as the current item for multipurpose
knob to adjust.
- Menu operation:
When operating on the menu, you can rotate the multipurpose knob 1/2 toadjust the value in the menu. When you click or tap an input field and then the/icon is displayed in the input field, it indicates that you can use

multipurpose knob 1/2 to set the value. The LED indicator of the correspondingknob is illuminated. At this point, you can rotate the knob to adjust the value orpress the knob to restore the parameter to the default value.
When using the virtual numeric keypad or drop-down list, you can rotate theknob to navigate through the keypad or drop-down list and press the knob toselect an item.
3. Analyse Key

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Quick Start

Press

to access the Analyse menu. In this menu, you can access analysis

features including digital voltmeter (DVM), counter, power analysis, waveformrecording, and pass/fail.
4. Measure Key
Press

to access the Measure menu. You can select the waveform parametersin the menu. For details, refer to Select the Measurement Item.
5. Cursor Key
Press

to enable cursor measurements. The results are displayed in the right-

side "Result" bar. Three cursor modes are available: Manual, Track, and XY; wherein,
the XY mode is available only when the XY function is enabled.
6. Common Tools Keys-

is the auto scale key. Press this key to enable the auto scale function.
The oscilloscope is automatically configured to best display the input signals by
adjusting the vertical scale, horizontal timebase, and trigger mode. To set up
the key, please refer to Auto Config.

-

is the RUN/STOP key. Press the key to set the oscilloscope's run state to"RUN" or "STOP". In "RUN" state, this key is illuminated in green; in "STOP"
state, this key is illuminated in red.

-is the key for a single acquisition. Press this key to set the oscilloscope's
trigger mode to "Single".
is the default setup key. Press this key twice to directly restore the-oscilloscope's default settings. You can also press the key and a dialog box isdisplayed. Click or tap OK in the dialog to restore the oscilloscope's default
settings.
-

is the clear key. Press this key to clear all waveform on the display. If
the oscilloscope is in "RUN" mode, it continues to display new waveforms.

7. Touch Lock Key

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Quick Start

is the touch lock key. Press this key once to disable the touch screen
function; press it again to enable the touch screen.
8. Quick Action Key
Press

to perform the selected quick action: print screen, save wave, save

setup, measure all, statistics reset, waveform record, or save group. To set up thekey, please refer to Quick Action Settings.
9. Trigger Controls-

is the trigger setup key. Press this key to access the Trigger
menu. For details, please refer to Triggering the Oscilloscope.
is the trigger slope setup key. Press this key to select the-edge type (rising edge, falling edge, or either edge). This key is
not active when the trigger type is not set to "Edge".
-is the force trigger key. Press this key to force a trigger.

-

LEVEL is the trigger level/digital threshold knob. Turn theknob clockwise to increase the trigger level or turn the knob
counterclockwise to decrease the level. Pressing the knob canquickly set the trigger level to the waveform's 50% peak-to-peakvalue.

10. Horizontal Controls- Horizontal

POSITION is the horizontal position knob.

Turn the knob to change the horizontal position (trigger
position) to move the waveforms horizontally. Press theknob to reset the horizontal position to default.
- Horizontal

SCALE is the horizontal scale knob. Turn theknob to change the horizontal time/div setting to compress
or expand waveforms of all channels horizontally. Press thisknob to toggle between fine and coarse adjustment forhorizontal time base or enable/disable the Zoom mode(related to Fine/Zoom)-

is the horizontal menu key. Press this key to accessthe Horizontal menu in which you can set the horizontal
system and acquisition system.

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is the Navigate key. Press this key to access the
Navigation menu. You can navigate time, search events, orsegments. For details, please refer to Navigation.
are the navigation keys. You can use the-keys to navigate time, search events, or segments. You canalso use the keys to play recorded waveforms.
11. Vertical Controls-

is the Math key. Press this key to access the Math menu. Mathoperations include A+B, A-B, A×B, A/B, FFT, etc. You can also set the Math label.
is the reference key. Press this key to assess the Ref menu, in which you-

can add reference waveforms in waveform view and compare them withmeasured waveforms to identify circuit fault.
- Vertical

POSITION is the vertical position knob. Turn this knob to change

the selected waveform's vertical position to move the waveform up or down on
the display. Press this knob to reset the vertical position to zero.
- Vertical

SCALE is the vertical scale knob. Rotate this knob to modify thevalue of vertical divisions of the graticule in volts/div to increase or decrease thedisplay amplitude of the waveform. Press this knob to toggle between fine andcoarse adjustment of the vertical scale.
-

/

/

/

is the channel key. Depending on the actual

situation, press the key to enable (display), select, or disable the corresponding
channel, as described below:- If the channel is not displayed, you can press the channel key to open thechannel in the waveform view window.
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Quick Start- If the channel is displayed but not selected, you can press the channel key toselect the channel.
- If the channel is both displayed and selected, you can press the channel key
to close its display in the waveform view.
NOTE
As DHO802/DHO812 is a two-channel model, it only provides two channel keys (

and

).

12. Probe Compensation Signal Output Terminal/Ground Terminal
This terminal outputs the probe compensation signal which helps you match aprobe's input capacitance to the oscilloscope channel to which it is connected.
13. External Trigger Input Terminal (for DHO812 and DHO802 only)
BNC connector to input external trigger signal.
14. Analog Channel Input Terminals
BNC connectors. Attach probes to these connectors for analog signal inputs.
NOTE
As DHO802/DHO812 is a two-channel model, it only provides two analog input terminals.

15. USB HOST PortThis series supports USB storage device of FAT32/NTFS format and mouse.
- USB storage device: imports or exports data (software update, waveform,
setup, or captured image).
- Mouse: connects a mouse to control the instrument.
16. Power Key
Powers on/off the oscilloscope.

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Quick Start

4.4.2

Rear Panel Overview

2
3

1

4
5
6

8

7
Figure 4.11 Rear Panel

1. AUX OUT- Trigger output:
After the AUX output is set to "TrigOut", the oscilloscope generates a trigger
and outputs a signal that can reflect the current capture rate of the oscilloscope
via this interface. Connect the signal to a waveform display device and measure
the frequency of the signal. The measurement result is the same as the current
capture rate.
- Pass/Fail:
After the AUX output is set to "PassFail", in the pass/fail test, the instrument will
output a pulse via the [AUX OUT] connector when a passed or failed waveform
is detected during the pass/fail test.
2. LAN
Connect the instrument to network via this interface. The instrument conforms to
the standards specified in LXI Device Specification 2011. Its test system can bebuilt quickly. Then you can control the instrument through using Web Control tosend the SCPI commands. When update is available, you can perform online
upgrading for the system software of the instrument via the LAN interface.
3. USB DEVICE
Connect the instrument to the PC via this interface. Then you can use the PC
software to send the SCPI commands or use the user-defined programming tocontrol the instrument.
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Quick Start

4. HDMI
You can connect the instrument to an external display that has the HDMI interface(e.g. monitor or projector) via this interface to better observe the waveform display
clearly. At this time, you can also view the waveforms on the LCD of the
instrument.
5. USB Type-C Power Connector
The power requirements of the oscilloscope are DC, 12 V, 4 A. Please use thepower adaptor provided in the accessories to connect the oscilloscope to the AC
power source (100 V to 240 V, 50 Hz to 60 Hz).
6. Security Lock HoleUse a standard PC/laptop lock cable to secure the oscilloscope to a work bench orother location.
7. Ground Terminal
Connect the instrument chassis to the ground using the lead.
8. Mounting Screws
Interval of screw holes: 100 mm x 100 mm. Use screws to secure the oscilloscopeto the bracket with the same screw hole interval.

4.4.3

User Interface Overview
1

2

3

4

5

6

7

8

9

13

11

12

10

Figure 4.12 User Interface

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Quick Start

1. Waveform View
Displays the measurement waveform window for CH1-CH4. Click or tap
upper-right corner of the window to close the window; click or tap

at theto enterthe configuration menu of the specified function.
2. Run State Label
Displays the operating status of the instrument. Possibles states include RUN,
STOP, T'D, WAIT, and AUTO.
3. Horizontal Timebase Label
Displays the current horizontal time base. Click or tap this label to enter thehorizontal setting menu.
4. Sample Rate & Memory Depth Label
Displays the current sample rate and memory depth. Click or tap this label to enter
the horizontal setting menu.
5. Horizontal Position Label
Displays the current horizontal position. Click or tap this label to enter thehorizontal setting menu.
6. Trigger Label- Displays the trigger information of the system, including the trigger type,
trigger level, trigger mode, and etc.
- Click or tap the trigger label, then the trigger setting window is displayed. You
can set the parameters for the trigger.
7. Function Toolbar
Provides STOP/RUN, Default, Measure, Flex Knob, Windows, Cursors, Math, XY,
Storage, Counter, DVM, Decode, Record, and Navigate keys.
8. Result Sidebar
Displays the measurement results and statistics of various functions. Click or tap
at the lower-right corner of the screen to open or close the "Result" sidebar.
9. Split-screen Display
If you enable multiple functions, multiple windows can be displayed on the screen
at one time.
10. Notification Area
Displays USB icon, LAN icon, sound icon, and remote control icon. You can click or
tap this area to open the "Utility" menu.

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Quick Start- USB storage device icon: When a USB storage device is detected,

will bedisplayed.
- LAN icon: When the LAN interface is successfully connected,

is displayed.

- Sound icon: In the "Utility" menu, click or tap Setup > Beeper to enable ordisable the sound. When on,

will be displayed; when off,

will bedisplayed. You can simply click or tap the icon to enable or disable the sound.
- Remote control icon: When you use Web Control to control the instrument
remotely,

will be displayed.

11. Math Labels- Displays the on/off states of Math1-Math4.
- Click or tap M1-M4 labels to display the on/off state, operation type, andvertical scale for Math1-Math4.
12. Channel Labels- Display the channel on/off status.
- Display the channel coupling mode.
- Display the vertical scale.
- Display the vertical offset.
- Click or tap the label to enable/disable the corresponding channel or open the
Vertical menu.
NOTE
As DHO802/DHO812 is a two-channel model, it only provides two channel labels.

13. Function Navigation Icon
Click or tap the icon to open the function navigation menu in which you canaccess the specified function menu by clicking or tapping the corresponding
function key.

4.5

Touch Screen Gestures
The instrument's large capacitive touch screen makes operation and configurationeasy and flexible. The highly sensitive user interface designed for touch has a strong
waveform display capability, bringing an extraordinary user experience. The actions

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Quick Start

supported by the touch screen controls include tapping, pinching&stretching, as wellas dragging.

4.5.1

Tap
Use one finger to tap the symbol or characters on the screen slightly, as shown in

Figure 4.13 . With the Tap gesture, you can perform the following operations:•Tap the menu displayed on the screen to operate on the menu.

•

Tap the function navigation icon at the lower-left corner of the touch screen to
enable the function navigation.

•

Tap the displayed numeric keypad to set the parameters.

•

Tap the virtual keypad to set the filename.

•Tap the close button at the upper-right corner of the message box to close theprompt window.

•

Tap other windows on the touch screen and operate on the windows.

Figure 4.13 Tap Gesture

4.5.2

Drag
Use one finger to select the object, and then drag the object to a destination place, as
shown in the figure below. With the drag gesture, you can perform the following
operation:•

Drag the waveform to change its position or scale.

•

Drag the window controls to change the position of the window (e.g. numeric
keypad).

•Drag the cursor to move the cursor.

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Drag the trigger cursor to change the trigger level.

•

In multi-window display, drag one of the displayed windows to change its
position on the display.

Figure 4.14 Drag Gesture

4.5.3

Pinch&Stretch
Pinch or stretch two points on the screen with two fingers to zoom in or out the
waveform. To zoom in the waveform, first pinch the two fingers and then stretch thefingers; to zoom out the waveform, first stretch the two fingers, and then pinch thefingers together, as shown in the figure below. With the pinch&stretch gesture, you
can perform the following operation:•

Pinching&stretching in the horizontal direction can adjust the horizontal timebase of the waveform.

•

Pinching&stretching in the vertical direction can adjust the vertical scale of the
waveform.

Figure 4.15 Pinch&Stretch Gesture

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4.6

Parameter Setting Method
For this instrument, you can use the knob and touch screen to set parameters. The
common parameter setting methods are as follows:•

Method 1: Some parameters can be adjusted by rotating the knob on the front
panel.

•

Method 2: Click or tap the input field of a specified parameter, then a virtual
keypad is displayed. Complete the parameter setting with the keypad.

Input Chinese and English Characters
When naming a label, this instrument supports Chinese/English input method. The
following part introduces how to input Chinese and English characters with the
Chinese/English input method.
•

Input English Characters
Uppercase/Lowercase Switchover

Input Method Switch to Numbers
And Symbols
Switchover

Name Input Area

Virtual Keypad

Space Key

Backspace Key

Confirm Input

Figure 4.16 English Input Interface
1. Select English input method
First check the input method type. If it shows "En/中", then go to Step 2; if itshows "中/En", click or tap the input method switchover key to switch to "En/中" (English input method).
2. Clear the name input area
If there is no character in the "Name Input Area", please go to the next step. If
there are characters in the "Name Input Area", click or tap the Backspace key
to delete all the characters from the "Name Input Area" in order.

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3. Input the upper-case letter
If you want to input an upper-case letter, first use the Caps key to switch
between the upper-case and lower-case mode. If the Caps key is selected,
input the upper-case letter with the virtual keypad. If not, first click or tap theCaps key to ensure it is selected, then input the upper-case letter. All the input
letters will be displayed in the "Name Input Area".
4. Input the lower-case letter
Refer to the operation specified in the previous step. If the Caps key is notselected, directly input the lower-case letter.
5. Input numbers or symbols
If the letter keypad is displayed, you need to click or tap the numericswitchover key to switch to the numeric keypad, and input numbers or
symbols with the numeric keypad. All the input letters will be displayed in the"Name Input Area".
6. Modify or delete the unwanted characters that have been input
During the name input process, you can modify or delete the unwanted
character if necessary. To delete the characters that have been input, click or
tap the Backspace key in the virtual keypad to delete the characters. To
modify the characters that have been input, delete the unwanted characters
first and then input the new characters.
You can directly move the cursor to the character to be modified or deleted,delete the desired character or input the new characters after deleting theunwanted character.
7. Confirm the input
After completing the input operation, click or tap "OK".
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Input Chinese Characters

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Quick Start

Pinyin Input Area

Chinese Character
Selection Area

Figure 4.17 Chinese Input Interface
1. Select Chinese input method
First check the input method type. If it shows "中/En", then go to Step 2; if itshows "En/中", click or tap the input method switchover key to switch to"中/En" (Chinese input method).
2. Clear the name input area
If there is no character in the "Name Input Area", please go to the next step. If
there are characters in the "Name Input Area", click or tap the Backspace key
to delete all the characters from the "Name Input Area" in order.
If there are characters in the "Pinyin Input Area", when you delete charactersfrom the name input area, the characters in the Pinyin input area will bedeleted first.
3. Input Chinese characters
Click or tap the characters in the virtual keypad to input Pinyin into the input
area, then the characters to be selected will be displayed in the Chinesecharacter selection area. Slide to view more Chinese characters for you tochoose. Select the desired Chinese character, and then the selected character
will be displayed in the input area.
4. Modify or delete the unwanted characters that have been input
During the name input process, you can modify or delete the unwanted
character if necessary. To delete the characters that have been input, click or
tap the Backspace key in the virtual keypad to delete the characters. To
modify the characters that have been input, delete the unwanted characters
first and then input the new characters.
5. Confirm the input
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Quick Start

After completing the input operation, click or tap "OK".
Input a String
When naming a file or folder, you need to input a string with the string keypad.
Uppercase/Lowercase Switchover

Name Input Area

Switch to Numbers and Symbols

Virtual Keypad

Space Key

Backspace Key

Confirm Input

Figure 4.18 String Keypad
1. Clear the name input area
If there is no character in the "Name Input Area", please go to the next step. If
there are characters in the "Name Input Area", click or tap the Backspace key todelete all the characters from the "Name Input Area" in order.
2. Input the upper-case letter
If you want to input an upper-case letter, first use the Caps key to switch between
the upper-case and lower-case mode. If the Caps key is selected, input the uppercase letter with the virtual keypad. If not, first click or tap the Caps key to ensure it
is selected, then input the upper-case letter. All the input letters will be displayedin the "Name Input Area".
3. Input the lower-case letter
Refer to the operation specified in the previous step. If the Caps key is notselected, directly input the lower-case letter.
4. Input numbers or symbols
If the letter keypad is displayed, you need to click or tap the numeric switchover
key to switch to the numeric keypad, and input numbers or symbols with thenumeric keypad. All the input letters will be displayed in the "Name Input Area".

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Quick Start

5. Modify or delete the unwanted characters that have been input
During the name input process, you can modify or delete the unwanted character
if necessary. To delete the characters that have been input, click or tap the
Backspace key in the virtual keypad to delete the characters. To modify thecharacters that have been input, delete the unwanted characters first and theninput the new characters.
You can directly move the cursor to the character to be modified or deleted, delete
the desired character or input the new characters after deleting the unwanted
character.
6. Confirm the input
After completing the input operation, click or tap "OK".
Input a Value
When setting or modifying a parameter, input an appropriate value with the numeric
keypad.
•Click or tap the value or unit in the numeric keypad to complete the input.

•

Rotate the multipurpose knob (1/2) to move the cursor to select the desired
value and unit. Press the knob to confirm the input.

CursorDelete Key
Max. Value
Min. Value
Default Key
Clear Key

Ten to the Nth Power

Confirmation Key

Unit

Figure 4.19 Numeric Keypad
After you input all the values and select the desired units, the numeric keypad isturned off automatically. This indicates that you have completed parameter setting.
Besides, after you have input the values, you can also click or tap "OK" directly to

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Quick Start

close the numeric keypad. At this time, the unit of the parameter is the default unit. In
the numeric keypad, you can perform the following operations:

4.7•

Modify the parameter value that has been input;•

Set the parameter value to a maximum or minimum value;•

Set the parameter to a default value;•

Clear the parameter input field.

To Use the Security LockIf necessary, you can lock the instrument to a fixed location by using the security lock(please purchase it by yourself), as shown in the figure below.
The method is as follows: align the lock with the lock hole and plug it into the lockhole vertically, turn the key clockwise to lock the oscilloscope, and then pull the key
out.

Security Lock Hole

Figure 4.20 To Use the Security Lock

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Quick Start

CAUTION
Please do not insert other objects into the security lock hole to avoid damaging the
instrument.

4.8

To Use the Built-in Help System
The built-in help file provides information about the functions and menu
introductions of the instrument. Click or tap> Help to enter the help system.

In the help system, you can get its help information by clicking on or tapping the link
for the specified chapter.

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Vertical System

5

Vertical System
This series oscilloscope provides 2 analog input channels (CH1-CH2) for DHO802 andDHO812 and 4 analog input channels (CH1-CH4) for DHO804 and DHO814, and eachchannel is equipped with an independent vertical control system. The setting
methods for their vertical systems are the same. This chapter takes CH1 of the fourchannel model as an example to introduce the setting method for the vertical system.
When a channel is selected, click or tap the channel status label at the bottom of thescreen. Then the menu as shown in the figure below is displayed.

Figure 5.1 Vertical Menu

5.1

To Enable or Disable the Analog Channel
Enable the Analog Channel
When a signal is connected to CH1, you can enable the channel in the following ways.
•

Click or tap the channel status label at the bottom of the screen to enable thechannel.

•Press the front-panel

key to enable the channel, and the backlight of thiskey is illuminated.
•

In Figure 5.1 , select the CH1 tab. Click or tap the Display on/off switch to turnCH1 on or off.

When CH1 is activated, its status label at the bottom of the screen is as shown in the
figure below.

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Vertical System

The information displayed in the channel status label is related to the current channel
setting (irrelevant with the on/off status of the channel). After the channel is turned
on, modify the parameters such as the vertical scale, horizontal time base, trigger
mode, and trigger level according to the input signal for easy observation andmeasurement of the waveform.
When CH1 is enabled but not activated, its status label is as shown in the following
figure.

Click or tap the channel status label at the bottom of the screen or press the frontpanel

key to activate CH1. You can also select the CH1 tab in Vertical menu toactivate it.
Disable the Analog Channel
You can disable the analog channel in the following ways.
•

If CH1 has been enabled and activated, you can press the front-panel

key

to disable it directly. You can also click or tap the channel status label at thebottom of the screen to open the Vertical menu and then click or tap the label
again to disable the channel.
•

If CH1 has been enabled but not activated, first activate the channel. Then press
the front-panel

key or use the channel status label to disable CH1.

•

In Figure 5.1 , set Display to OFF to disable CH1.

•

In addition, you can slide down the channel label to disable the channel.

If CH1 is disabled, its status label is as shown in the figure below.

5.2

To Adjust the Vertical Scale
Vertical scale indicates the voltage value per grid in the vertical axis of the screen. It is
often expressed in V/div. Adjusting the vertical scale increases or decreases the

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Vertical System

display amplitude of the waveform. The scale information of the channel status label
at the bottom of the screen would change accordingly.
VerticalScale

The adjustable range of the vertical scale is related to the current probe ratio. Bydefault, the probe ratio is 1X. In this case, the adjustable range of the vertical scale isfrom 500 μV/div to 10 V/div.
When CH1 is turned on and activated, you can adjust the vertical scale in thefollowing ways.
•

Rotate the Vertical

SCALE knob to adjust the vertical scale (clockwise to

reduce the scale and counterclockwise to increase).
•

Enable the touch screen function, and then adjust the vertical scale with thepinch & stretch gesture on the touch screen. For details, refer to descriptions in

Pinch&Stretch.
•

In the Vertical menu, click or tap the icon at the right side of the input field ofScale to increase or decrease the scale value or use the corresponding
multipurpose knob on the front panel to set the value. You can also click or tap
the input field to input a specific value with the displayed numeric keypad.

Input Field

Increase Decrease

In the Vertical menu, click or tap the Fine on/off switch to toggle between ON (fineadjustment) and OFF (coarse adjustment). The default setting is OFF. You can alsopress the Vertical

SCALE knob to toggle between "coarse adjustment" and "fineadjustment".

•

Fine adjustment: Use the icons at the right side of Scale or rotate the knob tofurther adjust the vertical scale within a relatively smaller range to improvevertical resolution. If the amplitude of the input waveform is a little bit greaterthan the full scale under the current scale and the amplitude would be a little bit

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Vertical System

lower if the next scale is used, fine adjustment can be used to improve theamplitude of waveform display to view signal details.
•

Coarse adjustment: Use the icons at the right side of Scale or rotate the knob toadjust the vertical scale in a 1-2-5 step sequence, i.e. 500 μV/div, 1 mV/div, 2
mV/div, 5 mV/div, 10 mV/div...10 V/div.

5.3

To Adjust the Vertical Offset
Vertical offset indicates the offset of the signal ground level position of the waveformfrom the vertical center of the display. Its unit is consistent with the currently selected
amplitude unit (refer to To Specify the Amplitude Unit). Adjusting the vertical offset
moves the corresponding channel's waveform up and down. The vertical offset
information (as shown in the following figure) in the channel status label at thebottom of the screen will change accordingly.

Vertical
Offset
The adjustable range of the vertical offset is related to the current probe ratio andvertical scale.
When CH1 is turned on and activated, you can adjust the vertical offset in thefollowing ways.
•

POSITION knob at the right section of the front panel toRotate the Verticaladjust the vertical offset within the adjustable range. Rotate this knob clockwise
to increase the vertical offset, and rotate it counterclockwise to reduce thevertical offset. Pressing down the knob can quickly reset the vertical offset (setthe vertical offset to 0).
•

Enable the touch screen function, and then adjust the vertical offset with thedrag gesture. For details, refer to Drag.

•In the Vertical menu, click or tap the Up/Down arrow icon at the right side of the
input field of Offset to increase or decrease the offset value or use thecorresponding multipurpose knob to set the value. You can also click or tap the
input field to input a specific value with the pop-up numeric keypad.

Input Field

Decrease Increase

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5.4

To Specify Channel Coupling
You can remove unwanted signals by setting the coupling mode. For example, thesignal under test is a square waveform with DC offset.
Click or tap the channel status label at the bottom of the screen, and then the
Vertical menu is displayed. Click or tap the Coupling drop-down button to select the
coupling mode.

•

When the coupling mode is "DC", both the DC and AC components of the signal
under test can pass the channel.

•

When the coupling mode is "AC", the DC components of the signal under test
are blocked•

When the coupling mode is "GND", the DC and AC components of the signal
under test are blocked.

After a coupling mode is selected, it is indicated in the channel status label at thebottom of the screen, as shown in the figure below.

DC

5.5

AC

GND

To Specify Bandwidth Limit
This oscilloscope supports the bandwidth limit function. Setting the bandwidth limit
can reduce the noises in the displayed waveforms. For example, the signal under test
is a pulse with high frequency oscillation.
•

When the bandwidth limit is turned off, the high frequency components of thesignal under test can pass the channel.

•

When the bandwidth limit is turned on, the high frequency components found in
the signal under test that are greater than the limit are attenuated. This series
supports 20 MHz bandwidth limit.

Click or tap the channel status label at the bottom of the screen, and then the
Vertical menu is displayed. Click or tap the BW Limit drop-down button to select the
specified bandwidth. When the bandwidth limit is enabled, the specific bandwidth

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Vertical System

limit value will be displayed in the channel status label at the bottom of the screen, as
shown in the figure below.

TIP
Bandwidth limit can not only reduce the noise, but also can attenuate or eliminate the highfrequency components of the signal.

5.6

To Specify Input ImpedanceThis series oscilloscope provides 1 MΩ input impedance mode. In this mode, theinput impedance of the oscilloscope is very high, and the current flowed from thecircuit under test can be ignored.

5.7

To Invert a Waveform
Click or tap the channel status label at the bottom of the screen, and then the
Vertical menu is displayed. Then click or tap the Invert on/off switch to enable ordisable the waveform invert function.

When "ON" is selected, the channel label is as shown in the figure below.

When the Invert function is disabled, the waveform is displayed normally; whenenabled, the voltage values of the displayed waveform are inverted, as shown in the
figure below. Inverting a waveform also changes the result of math function,
waveform measurement, etc.

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Vertical System"Invert" Off"Invert" On

Figure 5.2 Waveform Invert On/Off
TIP
When the Invert function is turned on, the trigger (e.g. Edge trigger, Pulse trigger, or Slope
trigger) edge or polarity will be changed.

5.8

To Set Probe
The analog channel of this oscilloscope supports passive probes. For detailed
technical information of the probes, please refer to the corresponding Probe User
Guide.
Click or tap the channel status label at the bottom of the screen. Then the Verticalmenu is displayed. Then click or tap Probe to enter the Probe setting menu, as shownin the figure below.

Figure 5.3 Probe Setting Menu
Probe Ratio
The oscilloscope allows you to set the probe attenuation manually. To obtain theaccurate measurement results, you must set the probe ratio properly. By default, theprobe ratio is 1X.
The probe ratio values available are as shown in the following table.
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Vertical System

Table 5.1 Probe Ratio
Attenuation
Menu(display amplitude of the signal: actual
amplitude of the signal)0.001X

0.001:1

0.002X

0.002:1

0.005X

0.005:1

0.01X

0.01:1

0.02X

0.02:10.05X

0.05:1

0.1X

0.1:1

0.2X

0.2:1

0.5X

0.5:1

1X (default)

1:1

2X

2:1

5X

5:1

10X

10:1

15X

15:1

20X

20:1

50X

50:1

100X

100:1

150X

150:1

200X

200:1

500X

500:1

1000X

1000:1

1500X

1500:1

2000X

2000:1

5000X

5000:1

10000X

10000:1

15000X

15000:1

20000X

20000:1

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Vertical System

Attenuation
Menu(display amplitude of the signal: actual
amplitude of the signal)

50000X

50000:1TIP
The oscilloscope auto-recognizes certain probes with a fixed attenuation ratio. After that, theprobe ratio will also be auto recognized to save you from configuring it manually.

Go Back to the Vertical Menu
In the Probe setting menu, click or tap Vertical to go back to the Vertical menu.

5.9

To Specify the Amplitude Unit
Click or tap the channel status label at the bottom of the screen, and then the
Vertical menu is displayed. Click or tap the Unit drop-down button to select W, A, V,
or U. The default unit is V.

Changing the amplitude unit also changes the units of the functions related to thechannel accordingly.

5.10

To Adjust Bias
When you use an oscilloscope to make actual measurements, a small offset that arises
from the temperature drift of the component or external environment disturbancemay occur on the zero-cross voltage of the channel, which will affect themeasurement results of the vertical parameters. This series oscilloscope allows you to
set an offset calibration voltage for calibrating the zero point of the corresponding
channel so as to improve the accuracy of the measurement results.
In the "Vertical" menu, click or tap the Up/Down arrow icon at the right side of the
input field of Bias to increase or decrease the bias value. You can click or tap the input
field to set the value with the pop-up numeric keypad. You can also use thecorresponding multipurpose knob to set the value.
Value Input Area

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Decrease Increase

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Vertical System

The range of bias is related to the vertical scale.
TIP
If the zero-cross voltage of the channel has a larger amplitude offset that exceeds theadjustable range, please perform self-calibration for the instrument to ensure themeasurement accuracy. For details, refer to SelfCal.

5.11

To Specify the Skew
When using an oscilloscope for actual measurement, the transmission delay of theprobe cable may bring relatively greater errors (zero offset). This series oscilloscope
allows you to set a delay time for calibrating the zero offset of the corresponding
channel. Zero offset is defined as the offset of the crossing point of the waveform andtrigger level line relative to trigger position, as shown in the figure below.

Zero Offset
Figure 5.4 Zero Offset
In the "Vertical" menu, click or tap the Ch-Ch Skew input field to set the channel-tochannel skew time. The available range is from -100 ns to 100 ns, and the default is
0.00 s.

5.12

To Turn the Channel Label Display On/Off
The instrument uses the channel number to mark the corresponding channel by.

default. For ease of use, you can also set a label for each channel. For example,
Click or tap the channel status label at the bottom of the screen. Then the Verticalmenu is displayed. Click or tap the Label on/off switch to turn the label display on oroff. You can also click or tap the label input field to input a specific name for thechannel label with the pop-up keypad.

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Vertical System

For how to use the keypad, refer to descriptions in Parameter Setting Method.

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Horizontal System

6

Horizontal System
You can access the Horizontal menu in the following ways.
•

Click or tap the channel status label at the bottom of the screen, and then the
Vertical menu is displayed. Click or tap the Acquisition button to enter the
Horizontal menu.

•

Click or tap the horizontal time base label ("H" icon), acquisition label ("A" icon),or horizontal position label ("D" icon) at the top of the screen to enter the
Horizontal menu.

Horizontal Time Base•

Press the front-panel

Sample Rate

Horizontal Position

key to enter the Horizontal menu.

Figure 6.1 Horizontal Menu

6.1

To Adjust the Horizontal Time Base
Horizontal time base, also called the horizontal scale, refers to the time of each grid in
the horizontal direction of the screen. It is usually expressed in s/div. The range of thehorizontal time base is from 5.00 ns/div to 500 s/div.
While you change the horizontal time base, the displayed waveforms of all channels
are expanded or compressed horizontally relative to the selected time reference(Horizontal Expansion Reference). The horizontal time base in the horizontal timebase label ("H" icon) will change accordingly, as shown in the figure below.

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Horizontal System

You can adjust the horizontal time base in the following ways.
•

Rotate the front-panel Horizontal

SCALE knob to adjust the horizontal timebase (clockwise to decrease the scale and counterclockwise to increase).
•

Enable the touch screen function, and then adjust the horizontal time base with
the Pinch&Stretch gesture. For details, refer to Pinch&Stretch.

•

In the Horizontal menu, click or tap the icon at the right side of the input field ofScale to increase or decrease the horizontal time base or use the corresponding
multipurpose knob to set the value. You can also click or tap the input field to
input a specific value with the pop-up numeric keypad.

Input Field

Increase Decrease

In the Horizontal menu, click or tap the Vernier on/off switch to toggle between ON(fine adjustment) and OFF (coarse adjustment). You can also press the front-panel
Horizontal

SCALE knob to toggle between "coarse adjustment" and "fineadjustment".
•

Coarse adjustment: Click or tap the icons at the right side of the input field ofScale to adjust the horizontal time base of the waveforms of all channels in a
1-2-5 step sequence within the adjustable range.

•

Fine adjustment: Click or tap the icon at the right side of the input field of Scaleto adjust the horizontal time base of the waveforms of all channels at a smaller
step within the adjustable range.

6.2

To Adjust the Horizontal Position
Horizontal position, also called trigger position, refers to the trigger point position of
the waveforms of all channels in the horizontal direction relative to the center of thedisplay. When the waveform trigger point is at the left (right) side of the center, thehorizontal position is a positive (negative) value.
Changing the horizontal position moves the waveform trigger points and thedisplayed waveforms of all channels horizontally. The horizontal position displayed in
the horizontal position label ("D" icon) changes accordingly, as shown in the figure
below.

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Horizontal System

You can adjust the horizontal position in the following ways.
•

Rotate the Horizontal

POSITION knob at the right section of the front panel

to adjust the horizontal position within the adjustable range. Rotate this knob
clockwise to reduce the horizontal position or counterclockwise to increase thehorizontal position. Pressing the knob can quickly reset the horizontal position(set the horizontal position to 0).
•

Enable the touch screen function, and then adjust the horizontal position withthe drag gesture. For details, refer to Drag.

•In the "Horizontal" menu, use the corresponding multipurpose knob to set thehorizontal position or use the icons at the right side of the input field of Position
to increase or decrease the value, as shown in the figure below. You can also clickor tap the Position input field to input a specific value with the pop-up numeric
keypad.

Input Field

6.3

Increase Decrease

Zoom Mode (Delayed Sweep)
Zoom (delayed sweep mode) can be used to horizontally expand a length ofwaveform to view waveform details. In the Horizontal menu, click or tap the Zoom
on/off switch to enable or disable the delayed sweep function. When it is enabled,
you can set the scale and position in Zoom mode.

Input Field for Increase Decrease
Zoomed Time Base•

Input Field for Increase Decrease
Zoomed Position

Zoomed Scale: Rotate the corresponding multipurpose knob or use the icons at
the right side of the Scale input field to increase or decrease the time base for
the Zoom window. You can also click or tap the input field to input the specificvalue directly via the pop-up numeric keypad.

•

Zoomed Position: Rotate the corresponding multipurpose knob or use the icons
at the right side of the Position input field to increase or decrease the position

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Horizontal System

for the Zoom window. You can also click or tap the input field to input the
specific value directly via the pop-up numeric keypad.
When the Zoom mode is enabled, the display divides in half, as shown in the figure
below.
Zoomed Time Base

Main Time Base

Zoomed Position

Waveform before Expansion
Waveform after Expansion

Figure 6.2 Zoom Mode•

Waveform before expansion:
The upper portion of the display that is not covered by subtransparent grayshows the normal display of the waveform. Its horizontal time base (called themain time base) is indicated in the label at the upper-left corner of the display.
You can move the area left and right by adjusting the horizontal position andincrease or decrease the size of the area by adjusting the horizontal scale.

•

Waveform after expansion:
The lower portion shows the horizontally expanded version of the normal
waveform display. Its horizontal time base (called the zoomed time base) isdisplayed in the middle. Compared with the main time base, the zoomed timebase has higher resolution.

TIP
The zoomed time base should be smaller than or equal to the main time base.

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Acquisition System

7

Acquisition System
The "Horizontal" menu allows you to configure the instrument's acquisition system.

Figure 7.1 Horizontal Menu

7.1

Acquisition Mode
The acquisition mode is used to determine how the waveform points are calculated
from the sample points. In the Horizontal menu, click or tap the desired acquisitionmode for the Acquisition item. This oscilloscope provides four acquisition modes:
Normal (default), Average, Peak, and UltraAcquire. The selected acquisition mode isindicated in the acquisition label ("A" icon) at the top of the screen

Acquisition
Mode
NormalIn Normal acquisition mode, the oscilloscope samples the signal at a fixed timeinterval to rebuild the waveform. This mode produces the best display for most
waveforms.
Average
In this mode, the oscilloscope averages the waveforms from multiple acquisitions to
reduce the random noise of the input signal and increase the vertical resolution. A
greater number of averages lowers the noise and increases the vertical resolution. On
the other hand, the higher the number of averages, the slower the response of thedisplayed waveform to waveform changes.

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Acquisition System

When you select "Average" mode, click or tap the Averages input field to set the
number of averages with the pop-up numeric keypad or use the corresponding
multipurpose knob to set the value. Its range is from 2 to 65536, and the default is 2.
NOTE
The number of averages must be the Nth power of 2. When it is not in N power-of-2
increments, a prompt message "Truncation average error" is displayed. At this time, a valuethat is smaller than the one you input and the closest to N power-of-2 increments will be input
automatically.

Peak
In this mode, the oscilloscope acquires the maximum and minimum values of thesignal within the acquisition interval to get the signal envelope or capture narrowpulses that might be lost. This mode prevents signal aliasing at the expense of
exaggerating the noise.
In this mode, the minimum pulse width detected is the sample period.
UltraAcquire
UltraAcquire mode is one of the fast acquisition modes. It divides the oscilloscope's
memory into segments and fills a memory segment for each individual trigger event.
It provides a much higher waveform capture rate and helps minimize the dead time
between trigger events.
When you select "UltraAcquire" mode, click or tap the Display Frame input field to
set the number of frames and the Timeout input field to set the timeout. When thenumber of the frames reaches the maximum or the sampling time reaches thetimeout, the oscilloscope stops sampling and plots the waveform. Click or tap the
Display mode drop-down button to select the display mode of the acquired data.
•

Adjacent: Waveform segments are shown in an adjacent way with each segment
shown next to the previous segment in time order. A maximum of 100 frames
can be displayed on the screen at a time in this mode.

•

Overlay: All the captured waveform segments are overwritten to display as one
single segment of the waveform. A maximum of 100 frames can be displayed on
the screen at a time in this mode.

•

Waterfall: It displays the captured waveform segments in a cascaded display
order. A maximum of 100 frames can be displayed on the screen at a time in this
mode.

•

Perspective: The waveform segments are displayed in the ladder-like form, witheach segment being arranged above another with a certain perspective (angle),
moving up like a rising slope. A maximum of 100 frames can be displayed on thescreen at a time in this mode.

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Mosaic: The whole waveform view is divided into several blocks, and eachwaveform segment is displayed in each block in sequence. A maximum of 80
frames can be displayed on the screen at a time in this mode.

Figure 7.2 Display ModesTIP•

The UltraAcquire mode is not available when any of the following functions is enabled:
cursors, decoding, Search, Zoom, Pass/Fail test, waveform recording, reference waveform,
roll mode, slow sweep mode, and XY mode. To switch to the UltraAcquire mode, please
ensure that all of those functions are disabled.

•

In UltraAcquire mode, the functions mentioned above (except for roll mode and slow
sweep mode) are disabled. When roll mode or slow sweep mode is enabled, theacquisition mode is automatically switched to "Normal".

7.2

Sampling Mode
This oscilloscope only supports the real-time sampling mode. In this mode, theoscilloscope produces the waveform display from samples collected during one
trigger event. The maximum real-time sample rate of this series is 1.25 GSa/s. The
current sample rate is displayed in the acquisition label at the top of the screen.
By default, the operating status label at the left top of the screen is illuminated ingreen, indicating that the instrument is in real-time sampling, and the STOP/RUN
button on the toolbar is in green. Click or tap the STOP/RUN button or press thefront-panel

key to stop sampling. At this time, the operating status label shows"STOP" in red, and the STOP/RUN button turns red. Also, the backlight of the frontpanel

key turns red. The oscilloscope will maintain its last captured graph. You

can still pan or zoom the waveforms by using the horizontal/vertical controls.

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7.3

Sample Rate
Sampling is the process of converting an analog signal into digital data at a specified
time interval and then storing them sequentially in acquisition memory. The sample
rate is the reciprocal of the time interval.
In Horizontal menu, the "SaRate" item shows the current sample rate. The current
sample rate is also indicated in the acquisition label ("A" icon) at the top of thescreen, as shown in the figure below.

Sample Rate
Sample Interval
The sample rate of the analog channel is related to the instrument model and current
channel mode. For two-channel models (DHO802 and DHO812), the oscilloscope
provides up to 1.25 GSa/s real-time sample rate in single channel mode and 625
MSa/s real-time sample rate in all channels mode. For four-channel models (DHO814
and DHO804), the oscilloscope provides up to 1.25 GSa/s real-time sample rate insingle channel mode, 625 MSa/s real-time sample rate in half channels mode, and
312.5 MSa/s real-time sample rate in all channels mode.
•

Single channel mode: If any one of the channels is enabled, it is called single
channel mode.

•

Half channels mode: For four-channel models, if two of the channels areenabled, it is called half channels mode.

•

All channels mode: For two-channels models, if all two channels are enabled, it
is called all channels mode; for four-channel models, if any three channels or all
four channels are enabled, it is called all channels mode.

A sample rate that is too low might have the following effects on the waveform:•

Waveform Distortion: When the sample rate is too low, some waveform details
are lost, and the sample waveform displayed is rather different from the actual
waveform of the signal.

•

Waveform Aliasing: Aliasing occurs when the sample rate is twice lower than
the actual signal frequency (Nyquist Frequency). The frequency of the waveformreconstructed from the sample data is smaller than the actual signal frequency.

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Waveform Leakage: If the sample rate is too low, the waveform reconstructedfrom the sample data does not represent the original signal correctly.

7.4

Memory Depth
Memory depth refers to the number of points that the oscilloscope can store in asingle trigger acquisition. It reflects the storage capability of the acquisition memory.
DHO800 series oscilloscope provides up to 25 Mpts memory depth (standard).

Trigger Point
T

Pre-Sample

Delayed Sample
Memory Depth

Figure 7.3 Memory Depth
The following formula shows the relations among memory depth, sample rate, andhorizontal time base:

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MDepth ≥ SRate x TSCale x HDivs•

MDepth indicates the memory depth. The unit is pts.

•

SRate indicates the sample rate. The unit is Sa/s.

•

TSCale indicates the horizontal time base. The unit is s/div.

•

HDivs indicates the number of grids in the horizontal direction. The unit is div.

Therefore, with the same horizontal time base, a higher memory depth can ensure ahigher sample rate.
In Horizontal menu, click or tap the Mem Depth drop-down button to select the
memory depth. The default setting is "10k". The selected memory depth value isdisplayed in the acquisition label ("A" icon) at the top of the screen.

MemoryDepth•

When only one of the channels is enabled, the memory depths available include
Auto, 1 kpts, 10 kpts, 100 kpts, 1 Mpts, 10 Mpts, and 25 Mpts.

•

When two of the channels are enabled, the memory depths available include
Auto, 1 kpts, 10 kpts, 100 kpts, 1 Mpts, and 10 Mpts.

•

When three channels or all four channels are enabled (only available for fourchannel models), the memory depths available include Auto, 1 kpts, 10 kpts, 100
kpts, and 1 Mpts.

TIP•

In "Auto" mode, the oscilloscope selects the memory depth automatically according to
the current sample rate.

•

When Acquisition Mode is set to "Average", the maximum memory depth available is 10
Mpts in single channel mode and 1 Mpts in half channels mode/all channels mode.

7.5

Horizontal Expansion ReferenceThis function allows you to set the position that the waveform on the display isreferenced to when it is horizontally expanded or compressed when the horizontal
time base is adjusted. In the Horizontal menu, click or tap the Expand drop-down
button to select the reference position. Available options include Center (default),
Left, Right, Trigger, and User.
•

Center: when the horizontal time base is modified, the waveform will be
expanded or compressed horizontally relative to the center of the display.

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Left: when the horizontal time base is modified, the waveform will be expanded
or compressed horizontally relative to the leftmost position of the display.

•

Right: when the horizontal time base is modified, the waveform will be
expanded or compressed horizontally relative to the rightmost position of thedisplay.

•

Trigger: when the horizontal time base is modified, the waveform will be
expanded or compressed horizontally relative to the trigger point.

•

User: when the horizontal time base is modified, the waveform will be expanded
or compressed horizontally relative to the user-defined reference position.
When you select "User", click or tap the User Expansion input field and set thevalue with the displayed numeric keypad. Its range is from -500 to 500, and thedefault is 0.

7.6

Roll Mode
The roll mode causes the waveform to move across the screen from right to left. It
allows you to view the acquired data without waiting for a complete acquisition. In
Horizontal menu, select "Auto" or "OFF" in Roll.
•

Auto: the Roll mode is enabled. It is automatically enabled when the horizontal
scale is 50 ms/div or slower.

•

OFF: the Roll mode is disabled. The oscilloscope operates at slow sweep speeds
when the horizontal scale is 200 ms/div or slower. In slow sweep mode, theoscilloscope acquires the data to the left of the trigger point and then waits fortrigger. After the trigger occurs, it continues to acquire the data to the right of
the trigger point. When you use this mode to observe low-frequency signals, it isrecommended to set the channel coupling mode (To Specify Channel Coupling)to "DC".

TIP•

If the Zoom mode is currently turned on, enabling the roll mode automatically turns off
the Zoom mode.

•

The following functions are not available when the roll mode is enabled:

To Adjust the Horizontal Position (available when the oscilloscope run state is STOP),
Zoom Mode (Delayed Sweep), Triggering the Oscilloscope, Protocol Decoding, Pass/Fail
Test, Waveform Recording and Playing, Persistence Time, UltraAcquire, Average, XY
Mode, Search.

7.7

XY ModeBy default, this series oscilloscope uses the YT mode for waveform display window. In
YT mode, Y-axis indicates the Voltage and X-axis indicates the Time. Besides, it also

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supports the XY display in which both X-axis and Y-axis indicate voltage. The XY
mode converts the oscilloscope from a "Voltage-Time" display to a "Voltage-Voltage"display using two input channels.
Enable the XY Mode
You can enable the XY display mode in the following ways.
•

Click or tap the Windows button in the function navigation menu or on the
toolbar to enter the Add Window menu. In the "Diagram" item, click or tap XY >Add to enable the XY display mode.

•

Click or tap the XY button in the function navigation menu or on the toolbar toenable the XY display mode.

•

In the "Horizontal" menu, tick XY to enable the XY mode.

Configure the XY Mode
Click or tap

at the upper-right corner of the XY display window to enter the XY

configuration menu.

Figure 7.4 XY Menu•

Source: Click or tap the drop-down button of "Source X" to select the sourcechannel of the X-axis in the XY window. Click or tap the drop-down button of"Source Y" to select the source channel of the Y-axis in the XY window.
In the Add Window menu, you can also configure Source Z. Source Z, as the Zaxis input in the XY display mode, is used to control whether to display the X-Y
waveforms in the XY display mode. This function is called "blanking".

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When "None" is selected for "Source Z", the blanking function is disabled,
and you can only see the X-Y waveforms.

-

When you select "CH1-CH4" for "Source Z", the blanking function isenabled. The Z-axis input from the external connector determines whether
to display the X-Y waveforms. When Z is high (the input level is greater than0 V), the X-Y waveforms are displayed; when Z is low (the input level issmaller than 0 V), the waveforms are hidden.

•

Grid: Please refer to To Set the Screen Grid.

NOTE
Advanced settings are not available for now. The current settings can produce the best display.

Phase Deviation Measurement
In this mode, you can use the Lissajous method to measure the phase deviation of thetwo input signals whose frequencies are the same. The following figure shows themeasurement schematic diagram of phase deviation.

Figure 7.5 Measurement Schematic Diagram of Phase Deviation
According to sinƟ=A/B or C/D, Ɵ is the phase deviation angle between the twochannels. The definitions of A, B, C, and D are shown in the figure above. The phasedeviation angle is obtained, that is:
Ɵ=±arcsin(A/B) or ±arcsin(C/D)
If the principal axis of the ellipse is within Quadrant I and III, the phase deviation
angle obtained should be within Quadrant I and IV, namely within (0 to π/2) or (3π/2to 2π). If the principal axis of the ellipse is within Quadrant II and IV, the phasedeviation angle obtained should be within Quadrant II and III, namely within (π/2 toπ) or (π to 3π/2).

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The XY mode can be used to measure the phase deviation occurred when the signal
under test passes through a circuit network. Connect the oscilloscope to the circuit tomonitor the input and output signals of the circuit.

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Triggering the Oscilloscope

8

Triggering the Oscilloscope
The trigger system allows you to set specific trigger conditions as required. The
oscilloscope captures a waveform as well as its neighboring part and displays themon the screen once a particular trigger condition is met. For a digital oscilloscope, itsamples waveform continuously no matter whether it is stably triggered. Rather, only
stable triggering can produce stable display. The trigger module ensures that every
time base sweep or acquisition starts from the user-defined trigger condition, namely
every sweep is synchronous with the acquisition and the waveforms acquired areoverlapped so as to display the stable waveforms.
You should set the triggers based on the features of the input signal. To quickly
capture your desired waveforms, you need to understand the signal under test. Thisoscilloscope provides a variety of trigger types that help you focus on the desired
waveform details.
You can enter the Trigger menu in the following ways.
•

Press the front-panel•

In Figure 5.1 , click or tap the Trigger button to enter the trigger menu.

•

Click or tap the trigger label (as shown in the figure below) at the top of the

key to enter the trigger menu.

screen to enter the trigger menu.

8.1

Trigger Source
In the "Trigger" menu, click or tap the drop-down button of Source to select thedesired source. Available sources include analog channels CH1-CH4 and EXT.
Analog Channel Input
Signals input from analog channels CH1-CH4 can all be used as trigger sources. No
matter whether the channel selected is enabled, the channel can work normally.
External Trigger Input (for DHO812 and DHO802 only)
The external trigger source can be used to trigger on the third channel while both thechannels are acquiring data. The trigger signal (e.g. external clock or signal of thecircuit under test) will be connected to EXT trigger source via the external trigger
input terminal [EXT TRIG] connector. You can set the trigger conditions within therange of the trigger level (from -5 V to +5 V).

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8.2

Trigger Level
The adjustment of the trigger level/threshold level is related to the type of the trigger
source.
•When the trigger source is CH1-CH4, rotate the front-panel

LEVEL knob or

use the corresponding multipurpose knob (when the trigger menu is opened) toadjust the trigger level. You can also click or tap the Level input field to set thevalue with the pop-up numeric keypad. During the adjustment, a trigger levelline (the color of the trigger level line is the same as that of the channel) and a
trigger icon "" are displayed on the screen, and they move up and downwith the variation of the trigger level. When you stopping modifying the trigger
level, the trigger level line disappears in about 2 s. The current trigger level isdisplayed in the trigger information label at the top of the screen.
In Runt Trigger, Slope Trigger, and Window trigger, you need to set the upperand lower limits of the trigger level. Two trigger level icons

and

are

displayed at the right section of the screen.
•

When the trigger source is EXT, rotate the front-panel

LEVEL knob or use thecorresponding multipurpose knob (when the trigger menu is opened) to adjust
the trigger level. You can also click or tap the Level input field to set the value
with the pop-up numeric keypad. The current trigger level is displayed in thetrigger information label at the top of the screen.
For this trigger source, only the variation of the trigger level value is displayedon the screen during the adjustment of the trigger level, without displaying thetrigger level lines on the screen.
To better trigger the waveforms, for a trigger with a single level, you can directly clickor tap 50% in the menu or press the trigger level knob to make the level move to the
middle of the waveform. However, for a trigger with two levels (e.g. Slope trigger,
Runt trigger, Window trigger), you need to click or tap 90% for Level A and 10% forLevel B to make the level move within the range of the waveform amplitude.

8.3

Trigger Mode
The following is the schematic diagram of the acquisition memory. To better
understand the trigger event, you can think of the trigger event as dividing
acquisition memory into a pre-trigger and post-trigger buffer.

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Triggering the Oscilloscope

Trigger Event

Pre-trigger Buffer

Post-trigger Buffer

Acquisition Memory

Figure 8.1 Schematic Diagram of the Acquisition Memory
After the oscilloscope starts running, it first fills the pre-trigger buffer. Then, after the
pre-trigger buffer is filled, the oscilloscope starts searching for a trigger. While
searching for the trigger, the data sampled will still be transmitted to the pre-trigger
buffer (the new data will continuously overwrite the previous data). When a trigger isfound, the pre-trigger buffer contains the events that occurred just before the trigger.
Then, the oscilloscope will fill the post-trigger buffer and display the data in theacquisition memory. If the acquisition is initiated via the front-panel
process repeats; if the acquisition is initiated via thekey, thekey, it stops after finishinga single acquisition (you can pan and zoom the currently displayed waveform).
This series provides Auto (default), Normal, and Single trigger modes.
Click or tap the trigger information label (as shown in the figure below) at the top of
the screen or press the front-panel

key to open the "Trigger" menu. In the

Sweep item, you can quickly switch the current trigger mode. The selected trigger
mode is displayed in the trigger information label at the top of the screen: A (Auto), N(Normal), or S (Single).

•

Auto: In this trigger mode, if the specified trigger conditions are not found,triggers are forced and acquisitions are made so that signal activity is displayedon the oscilloscope. This trigger mode can be used when the signal levels are
unknown, when the DC signals should be displayed, or when trigger conditions
occur often enough that forced triggers are unnecessary.

•

Normal: In this trigger mode, triggers and acquisitions only occur when thespecified trigger conditions are found. This trigger mode can be used when thesignal is at a low repetition rate, when you only want to acquire specific events
specified by the trigger settings, or when you try to stabilize the display by
preventing the oscilloscope from auto-triggering.

•Single: In this trigger mode, a single trigger and acquisition only occur when thespecified trigger conditions are found, and then the oscilloscope stops. This

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trigger mode can be used when you need to make a single acquisition of thespecified event and analyze the acquisition result. You can pan and zoom thecurrently displayed waveform without subsequent waveform data overwriting
the current waveform. After a single trigger is initiated, the oscilloscope is in"STOP" state.
In Normal and Single trigger modes, you can click or tap the Force button in thetrigger menu or press the front-panel

8.4

key to force a trigger event.

Trigger Coupling
Trigger coupling determines what part of the signal is passed to the trigger circuit.
Please distinguish it from channel coupling (To Specify Channel Coupling). Thisfunction is available only when the trigger type is Edge and the trigger source is ananalog channel.
In the "Trigger" menu, click or tap the Coupling drop-down button to select thedesired coupling mode (by default, it is DC).

•

DC: allows DC and AC components to pass the trigger circuitry.

•

AC: blocks the DC components and attenuates the signals.

•

LFR: blocks the DC components and rejects the low-frequency components.

•

HFR: rejects the high frequency components.

TIP
When "AC" or "LFR" is selected as the coupling mode, no trigger level lines and trigger icons
are displayed. When you adjust the trigger level, you can only see the changes of the trigger
level values in the trigger information label at the top of the screen.

8.5

Trigger Holdoff
Trigger holdoff can be help stabilize triggering on complex repetitive waveforms thathave multiple edges or other events between waveform repetitions (such as pulse
series). Holdoff time is specified as the amount of time that the oscilloscope waits for
re-arming the trigger circuitry after generating a correct trigger. The oscilloscope will
not trigger even if the trigger condition is met during the holdoff time and will only
re-arm the trigger circuitry after the holdoff time expires.

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For example, to get a stable trigger on the repetitive pulse burst as shown in the
figure below, set the holdoff time to be greater than t1 but less than t2.

Figure 8.2 Trigger Holdoff
Click or tap the trigger information label (as shown in the figure below) at the top of
the screen or press the front-panel

key to open the "Trigger" menu. Click or

tap the input field of Holdoff to set the holdoff time (the holdoff to this time when
the waveforms are stably triggered) with the pop-up numeric keypad. You can also
use the corresponding multipurpose knob to set the value. The adjustable range ofthe holdoff time is from 8 ns (default) to 10 s.

8.6

Noise Rejection
Noise rejection can reject the high frequency noise in the signal and reduce thepossibility of triggering the oscilloscope by mistake.
Click or tap the trigger information label (as shown in the figure below) or press thefront-panel

key to open the "Trigger" menu. Click or tap the Noise Reject

on/off switch to enable or disable the noise rejection function.

8.7

Trigger Type
This series oscilloscope provides the following trigger types.

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8.7.1

Edge Trigger
Edge trigger identifies a trigger on the trigger level of the specified edge on the input
signal.
Trigger TypeClick or tap the Type drop-down button to select "Edge".

Figure 8.3 Edge Trigger Setting Menu
After a trigger type is selected, the current trigger setting information (including thetrigger type, source, and level) is displayed in the trigger information label at the topof the screen, as shown in the figure below. The information will change based on thetrigger settings.

Source Selection
Click or tap the Source drop-down button to select CH1-CH4 or EXT(for two-channel
models only). For details, refer to Trigger Source. The selected trigger source isindicated in the trigger information label at the top of the screen.
Only when you select the channel that has signal inputs as the trigger source, can you
obtain a stable trigger.
Edge TypeIn the Slope item, select which edge of the input signal will trigger the oscilloscope.
The selected slope will be indicated in the trigger information label.

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Rising: triggers on the rising edge of the input signal when the voltage level
meets the specified trigger level.

•

Falling: triggers on the falling edge of the input signal when the voltage level
meets the specified trigger level.

•

Either: triggers on the rising or falling edge of the input signal when the voltage
level meets the preset trigger level.

TIP
When edge trigger is selected, you can also press the front-panel

key to switch theedge type.

Trigger ModeIn Sweep, select Auto, Normal, or Single as the trigger mode. For details, refer todescriptions in Trigger Mode.
Trigger Parameter Setting
You can refer to Trigger Coupling, Trigger Holdoff, and Noise Rejection to set the
coupling, trigger holdoff, and noise rejection under this trigger type.
Trigger Level
Click or tap the Level input field to set the trigger level with the pop-up numeric
keypad. You can also use the front-panel trigger level knob or the corresponding
multipurpose knob to set the trigger level. For details, refer to descriptions in Trigger

Level. The current trigger level is displayed in the trigger information label at the topof the screen.

8.7.2

Pulse Width Trigger
Pulse width triggering sets the oscilloscope to trigger on the positive or negative
pulse of a specified width. In this mode, the oscilloscope will trigger when the pulse
width of the input signal satisfies the specified pulse width condition.
In this oscilloscope, positive pulse width is defined as the time difference between thetwo crossing points of the trigger level and positive pulse; negative pulse width isdefined as the time difference between the two crossing points of the trigger leveland negative pulse, as shown in the figure below.

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A

B

Trigger Level+Width-WidthA

B

Trigger Level

Figure 8.4 Positive/Negative Pulse Width
Trigger TypeClick or tap the Type drop-down button to select "Pulse".

Figure 8.5 Pulse Width Trigger Setting Menu
After a trigger type is selected, the current trigger setting information (including thetrigger type, source, and level) is displayed in the trigger information label at the topof the screen, as shown in the figure below. The information will change based on thetrigger settings.

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Source Selection
Click or tap the Source drop-down button to select CH1-CH4. For details, refer to

Trigger Source. The selected trigger source is indicated in the trigger information
label at the top of the screen.
Only when you select the channel that has signal inputs as the trigger source, can you
obtain a stable trigger.
PolarityIn the Polarity item, select the desired polarity: positive polarity (polarity () or negative).

Trigger Condition
Set the trigger condition in the When item.
•

When you select "Positive" for polarity, ">" for trigger condition, the oscilloscope
triggers when the positive pulse width of the input signal is greater than thespecified pulse width.

•

When you select "Positive" for polarity, "<" for trigger condition, the oscilloscope
triggers when the positive pulse width of the input signal is smaller than thespecified pulse width.

•

When you select "Positive" for polarity, "< >" for trigger condition, theoscilloscope triggers when the positive pulse width of the input signal is greaterthan the specified lower limit of pulse width and smaller than the specified
upper limit of pulse width.

•

When you select "Negative" for polarity, ">" for trigger condition, theoscilloscope triggers when the negative pulse width of the input signal is greaterthan the specified pulse width.

•

When you select "Negative" for polarity, "<" for trigger condition, theoscilloscope triggers when the negative pulse width of the input signal is smaller
than the specified pulse width.

•

When you select "Negative" for polarity, "< >" for trigger condition, theoscilloscope triggers when the negative pulse width of the input signal is greaterthan the specified lower limit of pulse width and smaller than the specified
upper limit of pulse width.

Pulse Width Setting•

In the When menu, when ">" or "<" is selected, click or tap the input field ofUpper or lower to set the upper limit value or the lower limit value with the
pop-up numeric keypad. You can also use the corresponding multipurpose knob
to set the value. The pulse width available is from 1 ns to 10 s.

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In the When menu, when "< >" is selected, click or tap the input field of Upperand Lower respectively to set the upper limit value and the lower limit value withthe pop-up numeric keypad. You can also use the corresponding multipurpose
knob to set the values. The lower limit of the pulse width must be smaller thanthe upper limit.

Trigger ModeIn Sweep, select Auto, Normal, or Single as the trigger mode. For details, refer todescriptions in Trigger Mode.
Trigger Parameter Setting
You can refer to Trigger Holdoff and Noise Rejection to set the trigger holdoff andnoise rejection under this trigger type.
Trigger Level
Click or tap the Level input field to set the trigger level with the pop-up numeric
keypad. You can also use the front-panel trigger level knob or the corresponding
multipurpose knob to set the trigger level. For details, refer to descriptions in Trigger

Level. The current trigger level is displayed in the trigger information label at the topof the screen.

8.7.3

Slope Trigger
Slope triggering sets the oscilloscope to trigger on the positive or negative slope ofthe specified time. This trigger mode is applicable to ramp and triangle waveforms.
In this oscilloscope, positive slope time is defined as the time difference between thetwo crossing points of trigger level line A and B with the rising edge; negative slope
time is defined as the time difference between the two crossing points of trigger levelline A and B with the falling edge. See the figure below.

A

Upper Limit of Trigger Level(Up Level)

B

Positive Slope Time

Lower Limit of Trigger Level(Low Level)

Negative Slope Time

Figure 8.6 Positive Slope Time/Negative Slope Time
Trigger TypeClick or tap the Type drop-down button to select "Slope".

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Figure 8.7 Slope Trigger Setting Menu
After a trigger type is selected, the current trigger setting information (including
trigger type, trigger source, and trigger level) is displayed in the trigger information
label at the top of the screen, as shown in the figure below. The information willchange based on the trigger settings.

Source Selection
Click or tap the Source drop-down button to select CH1-CH4. For details, refer to

Trigger Source. The selected trigger source is indicated in the trigger information
label at the top of the screen.
Only when you select the channel that has signal inputs as the trigger source, can you
obtain a stable trigger.
Edge Type
Select the input signal edge (in the Slope item) on which the oscilloscope triggers.
•

Rising: triggers on the rising edge of the input signal.

•

Falling: triggers on the falling edge of the input signal.

Trigger Condition
Set the trigger condition in the When item.

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When you select "Rising" for the edge type, ">" for trigger condition, theoscilloscope triggers when the positive slope time of the input signal is greaterthan the specified time.

•

When you select "Rising" for the edge type, "<" for trigger condition, theoscilloscope triggers when the positive slope time of the input signal is smaller
than the specified time.

•

When you select "Rising" for the edge type, "< >" for trigger condition, theoscilloscope triggers when the positive slope time of the input signal is greaterthan the specified lower limit time and smaller than the specified upper limit
time.

•

When you select "Falling" for the edge type, ">" for trigger condition, theoscilloscope triggers when the negative slope time of the input signal is greaterthan the specified time.

•

When you select "Falling" for the edge type, "<" for trigger condition, theoscilloscope triggers when the negative slope time of the input signal is smaller
than the specified time.

•

When you select "Falling" for the edge type, "< >" for trigger condition, theoscilloscope triggers when the negative slope time of the input signal is greaterthan the specified lower limit time and smaller than the specified upper limit
time.

Slope Time Setting•

In the When item, when ">" or "<" is set to trigger conditions, click or tap the
input field of Lower or Upper to set the lower limit value or the upper limit value
with the pop-up numeric keypad. You can also use the corresponding knob to
set the value. The slope time available is from 1 ns to 10 s.

•

In the When item, when "< >" is set to trigger conditions, click or tap the input
field of Upper and Lower respectively to set the upper limit value and the lower
limit value with the pop-up numeric keypad. You can also use the correspondingknob to set the values. The lower slope time limit must be smaller than theupper slope time limit.

Trigger ModeIn Sweep, select Auto, Normal, or Single as the trigger mode. For details, refer todescriptions in Trigger Mode.
Trigger Parameter Setting
You can refer to Trigger Holdoff and Noise Rejection to set the trigger holdoff andnoise rejection under this trigger type.

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Triggering the Oscilloscope

Level Selection and Setting
After the trigger condition setting is completed, you need to adjust the trigger levelto correctly trigger the signal and obtain a stable waveform.
Click or tap the Level A/Level B input field to set the level A/level B with the pop-up
numeric keypad. You can also use the trigger level knob or use the corresponding
multipurpose knob to adjust level A/level B. When Linkage is ticked, the upper limit
and lower limit values change at the same time. The difference between upper andlower limit remains unchanged. For details, refer to descriptions in Trigger Level. The
current trigger level is displayed in the trigger information label at the top of thescreen.
TIP
Press the trigger level knob to switch between three modes: "only adjust Level A", "only adjust
Level B", and "adjust Level A and Level B at the same time".

8.7.4

Video Trigger
The video signal can include image information and timing information, which adopts
different standards and formats. This series can trigger on the standard video signal
field or line of NTSC (National Television Standards Committee), PAL (Phase
Alternating Line), or SECAM (Sequential Couleur A Memoire).
Trigger TypeClick or tap the Type drop-down button to select "Video".

Figure 8.8 Video Trigger Setting Menu
After a trigger type is selected, the current trigger setting information (including
trigger type, trigger source, and trigger level) is displayed in the trigger information
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Triggering the Oscilloscopelabel at the top of the screen, as shown in the figure below. The information willchange based on the trigger settings.

Source Selection
Click or tap the Source drop-down button to select CH1-CH4. For details, refer to

Trigger Source. The selected trigger source is indicated in the trigger information
label at the top of the screen.
Only when you select the channel that has signal inputs as the trigger source, can you
obtain a stable trigger.
Video Polarity
In the Polarity item, select the desired polarity: positive polarity (polarity () or negative).

Video Standard
Click or tap the drop-down button of Standard to select the desired video standard.
Table 8.1 Video Standard
Video Standard

Frame Frequency(Frame)Scan TypeTV Scan Line

NTSC

30

Interlaced Scan

525

PAL/SECAM

25

Interlaced Scan625

480p/60Hz

60

Progressive Scan525

576p/50Hz

50Progressive Scan625

720p/60Hz

60

Progressive Scan

750

720p/50Hz

50Progressive Scan

750

720p/30Hz

30Progressive Scan

750

720p/25Hz

25

Progressive Scan

750

720p/24Hz

24

Progressive Scan

750

1080p/60Hz60

Progressive Scan1125

1080p/50Hz

50

Progressive Scan1125

1080p/30Hz30

Progressive Scan1125

1080p/25Hz

25

Progressive Scan1125

1080p/24Hz

24

Progressive Scan

1125

1080i/60Hz

60

Interlaced Scan

1125

1080i/50Hz

50Interlaced Scan

1125

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Sync
In the Sync item, select the desired sync type.
•

All Lines: triggers on the first line found.

•

Line: triggers on the specified line.
When this sync type is selected, you can specify a line number. Click or tap the
input field of Line to set the line number by using the pop-up numeric keypad.
You can also use the corresponding multipurpose knob to set the value. The
range of the line number is related to the currently selected video standards. The
range is from 1 to 525 (NTSC), 1 to 625 (PAL/SECAM), 1 to 525 (480p), 1 to 625(576p), 1 to 750 (720p), or 1 to 1125 (1080p/1080i).

•

Odd: triggers on the rising edge of the first ramp pulse in the odd field. It is only
available when the video standard is set to "NTSC" or "PAL/SECAM".

•

Even: triggers on the rising edge of the first ramp pulse in the even field. It isonly available when the video standard is set to "NTSC" or "PAL/SECAM".

Trigger ModeIn Sweep, select Auto, Normal, or Single as the trigger mode. For details, refer todescriptions in Trigger Mode.
Trigger Parameter Setting
You can refer to Noise Rejection to set the noise rejection under this trigger type.
Trigger Level
Click or tap the Level input field to set the trigger level with the pop-up numeric
keypad. You can also use the front-panel trigger level knob or the corresponding
multipurpose knob to set the trigger level. For details, refer to descriptions in Trigger

Level. The current trigger level is displayed in the trigger information label at the topof the screen.
TIP•

To better observe the waveform details in the video signal, you can set a larger memory
depth first.

•

In the trigger debugging process of video signals, the frequency in different part of thesignal can be reflected by a different brightness, as RIGOL's digital oscilloscope provides
the intensity graded color display function. Experienced users can quickly judge thesignal quality and discover abnormalities during the debugging process.

8.7.5

Pattern Trigger
The pattern trigger identifies a trigger condition by looking for a specified pattern.
This pattern is a logical "AND" combination of channels. Each channel can be set to H
(high), L (low), or X (don't care). A rising or falling edge (you can only specify a single

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Triggering the Oscilloscopeedge) can be specified for one channel included in the pattern. When an edge is
specified, the oscilloscope will trigger at the edge specified if the pattern set for theother channels are true (namely the actual pattern of the channel is the same as thepreset pattern). If no edge is specified, the oscilloscope will trigger on the last edgethat makes the pattern true. If all the channels in the pattern are set to "X", theoscilloscope will not trigger.

Figure 8.9 Pattern Trigger
Trigger TypeClick or tap the Type drop-down button to select "Pattern".

Figure 8.10 Pattern Trigger Setting Menu
After a trigger type is selected, the current trigger setting information (including thetrigger type, source, and level) is displayed in the trigger information label at the topof the screen, as shown in the figure below. The information will change based on thetrigger settings.

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Triggering the Oscilloscope

Source Selection
Click or tap the Source drop-down button to select CH1-CH4. For details, refer to

Trigger Source. The selected trigger source is indicated in the trigger information
label at the top of the screen.
Only when you select the channel that has signal inputs as the trigger source, can you
obtain a stable trigger.
Pattern Setting
The following five patterns are available:•

1: sets the pattern of the channel selected to "1", i.e. the voltage level is higher
than the trigger level of the channel.

•

0: sets the pattern of the channel selected to "0", i.e. the voltage level is lower
than the trigger level of the channel.

•

X: sets the pattern of the channel selected to "X", i.e. this channel is not used as apart of the pattern. When all channels in the pattern are set to "X", theoscilloscope will not trigger.

•: sets the pattern to the rising edge of the channel selected.

•: sets the pattern to the falling edge of the channel selected.

The Left/Right arrow key indicates moving left/right to switch the channel pattern.
"All" indicates all bits. Select a pattern for a channel and then click or tap All. The
patterns of all the other channels will be set to the currently selected pattern.
Only one edge (rising or falling edge) can be specified in the pattern. If one edge item
is currently defined and then another edge item is defined in another channel in thepattern, then a prompt message "Invalid input" is displayed.
Trigger ModeIn Sweep, select Auto, Normal, or Single as the trigger mode. For details, refer todescriptions in Trigger Mode.
Trigger Parameter Setting
You can refer to Trigger Holdoff and Noise Rejection to set the trigger holdoff andnoise rejection under this trigger type.
Trigger Level
Click or tap the Level input field to set the trigger level with the pop-up numeric
keypad. You can also use the front-panel trigger level knob or the corresponding
multipurpose knob to set the trigger level. For details, refer to descriptions in Trigger

Level. The current trigger level is displayed in the trigger information label at the topof the screen.

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Triggering the Oscilloscope

8.7.6

Duration Trigger
In duration trigger, the oscilloscope identifies a trigger condition by searching for theduration of a specified pattern. This pattern is a logical "AND" combination of thechannels. Each channel can be set to 1 (high), 0 (low), or X (don't care). The
instrument triggers when the duration (∆T) of this pattern meets the preset time, as
shown in the figure below.
∆T∆T

Pattern:HLHL

CH1

CH2

CH3

CH4

Figure 8.11 Duration Trigger
Trigger TypeClick or tap the drop-down button of Type to select "Duration".

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Triggering the Oscilloscope

Figure 8.12 Duration Trigger Setting Menu
After a trigger type is selected, the current trigger setting information (including thetrigger type, source, and level) is displayed in the trigger information label at the topof the screen, as shown in the figure below. The information will change based on thetrigger settings.

Source Selection
Click or tap the Source drop-down button to select CH1-CH4. For details, refer to

Trigger Source. The selected trigger source is indicated in the trigger information
label at the top of the screen.
Only when you select the channel that has signal inputs as the trigger source, can you
obtain a stable trigger.
Pattern Setting
The following three patterns are available:•

1: sets the pattern of the channel selected to "1", i.e. the voltage level is higher
than the trigger level of the channel.

•

0: sets the pattern of the channel selected to "0", i.e. the voltage level is lower
than the trigger level of the channel.

•

X: sets the pattern of the channel selected to "X", i.e. this channel is not used as apart of the pattern. When all channels in the pattern are set to "X", theoscilloscope will not trigger.

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Triggering the Oscilloscope

The Left/Right arrow key indicates moving left/right to switch the channel pattern.
"All" indicates all bits. Select a pattern for a channel and then click or tap All. The
patterns of all the other channels will be set to the currently selected pattern.
Trigger Condition
Set the trigger condition in the When item.
•>: triggers when the duration of the pattern is greater the preset time. Click or
tap the input field of Lower to set the lower limit of the duration of the patternwith the pop-up numeric keypad. You can also use the corresponding
multipurpose knob to set the value. The available range is from 1 ns to 10 s.

•<: triggers when the duration of the pattern is smaller than the preset time. Clickor tap the input field of Upper to set the upper limit of the duration of thepattern. You can also use the corresponding multipurpose knob to set the value.
The available range is from 1 ns to 10 s.

•< >: triggers when the duration of the pattern is smaller than the upper limit of
the preset time and greater than the lower limit of the preset time. Click or tap
the input field of Upper to set the upper limit of the duration of the pattern, andthe range is from 1.01 ns to 10 s. Click or tap the input field of Lower to set thelower limit of the duration of the pattern, and the range is from 1 ns to 9.9 s. You
can also use the corresponding multipurpose knob to set the upper/lower limit.
The lower time limit must be smaller than the upper time limit.

•> <: triggers when the duration of the pattern is greater than the upper limit of
the preset time or smaller than the lower limit of the preset time. Click or tap the
input field of Upper to set the upper limit of the duration of the pattern, and therange is from 1.01 ns to 10 s. Click or tap the input field of Lower to set thelower limit of the duration of the pattern, and the range is from 1 ns to 9.9 s. You
can also use the corresponding multipurpose knob to set the upper/lower limit.
The lower time limit must be smaller than the upper time limit.

Trigger ModeIn Sweep, select Auto, Normal, or Single as the trigger mode. For details, refer todescriptions in Trigger Mode.
Trigger Parameter Setting
You can refer to Trigger Holdoff and Noise Rejection to set the trigger holdoff andnoise rejection under this trigger type.
Trigger Level
Click or tap the Level input field to set the trigger level with the pop-up numeric
keypad. You can also use the front-panel trigger level knob or the corresponding
multipurpose knob to set the trigger level. For details, refer to descriptions in Trigger

Level. The current trigger level is displayed in the trigger information label at the topof the screen.
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8.7.7

Timeout Trigger
In Timeout trigger, the oscilloscope triggers when the time interval (∆T) (the timefrom when the rising edge (or falling edge) of the input signal passes through thetrigger level to the time from when the neighboring falling edge (or rising edge)
passes through the trigger level) is greater than the preset timeout value, as shown in

Figure 8.13 .

TTime Out < TTime Out
Figure 8.13 Timeout Trigger
Trigger TypeClick or tap the Type drop-down button to select "Timeout".

Figure 8.14 Timeout Trigger Menu
After a trigger type is selected, the current trigger setting information (including thetrigger type, source, and level) is displayed in the trigger information label at the topof the screen, as shown in the figure below. The information will change based on thetrigger settings.

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Source Selection
Click or tap the Source drop-down button to select CH1-CH4. For details, refer to

Trigger Source. The selected trigger source is indicated in the trigger information
label at the top of the screen.
Only when you select the channel that has signal inputs as the trigger source, can you
obtain a stable trigger.
Edge TypeIn Slope item, select the edge type from which the input signal passes through thetrigger level.
•

Rising: starts timing when the rising edge of the input signal passes through thetrigger level.

•

Falling: starts timing when the falling edge of the input signal passes throughthe trigger level.

•

Either: starts timing when either edge of the input signal passes through thetrigger level.

Timeout Value
Timeout value represents the maximum time that the signal remains idle before thesignal passes through the trigger level. Click or tap the input field of Timeout, andthen use the pop-up numeric keypad to set the timeout value of Timeout trigger. You
can also use the corresponding multipurpose knob to set the value.
Trigger ModeIn Sweep, select Auto, Normal, or Single as the trigger mode. For details, refer todescriptions in Trigger Mode.
Trigger Parameter Setting
You can refer to Noise Rejection to set the noise rejection under this trigger type.
Trigger Level
Click or tap the Level input field to set the trigger level with the pop-up numeric
keypad. You can also use the front-panel trigger level knob or the corresponding
multipurpose knob to set the trigger level. For details, refer to descriptions in Trigger

Level. The current trigger level is displayed in the trigger information label at the topof the screen.

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Triggering the Oscilloscope

8.7.8

Runt Trigger
The runt trigger sets the oscilloscope to trigger pulses that cross one trigger level but
not another, as shown in the figure below.
Positive Runt Pulse
Upper Limit of the
Trigger Level

Lower Limit of the
Trigger Level
Negative Runt Pulse

Figure 8.15 Runt Trigger
Trigger TypeClick or tap the drop-down button of Type to select "Runt".

Figure 8.16 Runt Trigger Setting Menu
After a trigger type is selected, the current trigger setting information (including thetrigger type, source, and level) is displayed in the trigger information label at the topof the screen, as shown in the figure below. The information will change based on thetrigger settings.

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Triggering the Oscilloscope

Source Selection
Click or tap the Source drop-down button to select CH1-CH4. For details, refer to

Trigger Source. The selected trigger source is indicated in the trigger information
label at the top of the screen.
Only when you select the channel that has signal inputs as the trigger source, can you
obtain a stable trigger.
Polarity
Select the pulse polarity of Runt trigger under the Polarity item.
•

Positive: indicates that the instrument triggers on the positive runt pulse.

•

Negative: triggers on the negative runt pulse.

Trigger Condition
Set the Runt trigger condition in the When item.
•

None: indicates not setting the trigger condition of Runt trigger.

•>: triggers when the runt pulse width is greater the Lower limit of pulse width.
Click or tap the input field of Lower to set the minimum pulse width of Runt
trigger with the pop-up numeric keypad. You can also use the corresponding
multipurpose knob to modify the value.

•<: triggers when the runt pulse width is smaller than the upper limit of pulse
width. Click or tap the input field of Upper to set the maximum pulse width ofRunt trigger with the pop-up numeric keypad. You can also use thecorresponding multipurpose knob to modify the value.

•< >: triggers when the runt pulse width is greater than the lower limit andsmaller than the upper limit of pulse width. Click or tap the input field of Upperto set the maximum pulse width of Runt trigger with the pop-up numeric
keypad. Click or tap the input field of Lower to set the minimum pulse width ofRunt trigger with the pop-up numeric keypad. You can also use thecorresponding multipurpose knob to modify the maximum and minimum pulse
width. The lower limit of the pulse width must be smaller than the upper limit.

Trigger ModeIn Sweep, select Auto, Normal, or Single as the trigger mode. For details, refer todescriptions in Trigger Mode.
Trigger Parameter Setting
You can refer to Trigger Holdoff and Noise Rejection to set the trigger holdoff andnoise rejection under this trigger type.

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Level Selection and Setting
After the trigger condition setting is completed, you need to adjust the trigger levelto correctly trigger the signal and obtain a stable waveform.
Click or tap the Level A/Level B input field to set the level A/level B with the pop-up
numeric keypad. You can also use the trigger level knob or use the corresponding
multipurpose knob to adjust level A/level B. When Linkage is ticked, the upper limit
and lower limit values change at the same time. The difference between upper andlower limit remains unchanged. For details, refer to descriptions in Trigger Level. The
current trigger level is displayed in the trigger information label at the top of thescreen.
TIP
Press the trigger level knob to switch between three modes: "only adjust Level A", "only adjust
Level B", and "adjust Level A and Level B at the same time".

8.7.9

Window Trigger
Window trigger provides a high trigger level and a low trigger level. The instrument
triggers when the input signal passes through the high trigger level or the low trigger
level.
Trigger TypeClick or tap the Type drop-down button to select "Over".

Figure 8.17 Window Trigger Setting Menu
After a trigger type is selected, the current trigger setting information (including
trigger type, trigger source, and trigger level) is displayed in the trigger information

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Triggering the Oscilloscopelabel at the top of the screen, as shown in the figure below. The information willchange based on the trigger settings.

Source Selection
Click or tap the Source drop-down button to select CH1-CH4. For details, refer to

Trigger Source. The selected trigger source is indicated in the trigger information
label at the top of the screen.
Only when you select the channel that has signal inputs as the trigger source, can you
obtain a stable trigger.
Edge Type
Select the input signal edge (in the Slope item) on which the oscilloscope triggers.
•

Rising: triggers on the rising edge of the input signal when Position condition ismet.

•

Falling: triggers on the falling edge of the input signal when Position condition
is met.

•Either: triggers on the rising or falling edge of the input signal when Position
condition is met.

Trigger Position
After selecting the window type, specify the time point of trigger by selecting thetrigger position (in Position item).
•Enter: triggers when the input signal enters the specified trigger level range.

•

Exit: triggers when the input signal exits the specified trigger level range.

•

Time: triggers when the accumulated hold time since the input signal entered
the specified trigger level range is equal to the window time. After you selectthis type, click or tap the input field of Time to set it by using the pop-up
numeric keypad. The available range is from 1 ns to 10 s.

Trigger ModeIn Sweep, select Auto, Normal, or Single as the trigger mode. For details, refer todescriptions in Trigger Mode.
Trigger Parameter Setting
You can refer to Trigger Holdoff and Noise Rejection to set the trigger holdoff andnoise rejection under this trigger type.

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Level Selection and Setting
After the trigger condition setting is completed, you need to adjust the trigger levelto correctly trigger the signal and obtain a stable waveform.
Click or tap the Level A/Level B input field to set the level A/level B with the pop-up
numeric keypad. You can also use the trigger level knob or use the corresponding
multipurpose knob to adjust level A/level B. When Linkage is ticked, the upper limit
and lower limit values change at the same time. The difference between upper andlower limit remains unchanged. For details, refer to descriptions in Trigger Level. The
current trigger level is displayed in the trigger information label at the top of thescreen.
TIP
Press the trigger level knob to switch between three modes: "only adjust Level A", "only adjust
Level B", and "adjust Level A and Level B at the same time".

8.7.10

Delay Trigger
In Delay trigger, you need to set Source A and Source B. The oscilloscope triggers
when the time difference (∆T) between the specified edges (Edge A and Edge B) of
Source A and Source B meets the preset time limit, as shown in the figure below.
Edge A and Edge B must be two neighboring edges.

Edge A

Source A
Edge B

Source B
T

Figure 8.18 Delay Trigger
Trigger TypeClick or tap the Type drop-down button to select "Delay".

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Triggering the Oscilloscope

Figure 8.19 Delay Trigger Setting Menu
After a trigger type is selected, the current trigger setting information (including
trigger type, trigger source, and trigger level) is displayed in the trigger information
label at the top of the screen, as shown in the figure below. The information willchange based on the trigger settings.

Source Setting•

Source A
Click or tap the drop-down button of SourceA to select CH1-CH4. For details,
refer to Trigger Source. The selected trigger source is indicated in the trigger
information label at the top of the screen.
Only when you select the channel that has signal inputs as the trigger source,
can you obtain a stable trigger.

•

Edge A
Select the trigger edge type ("Rising" or "Falling") of Source A in Delay trigger inthe EdgeA item.

•

Source B
Click or tap the drop-down button of SourceB to select CH1-CH4. For details,
refer to Trigger Source. The selected trigger source is indicated in the trigger
information label at the top of the screen.

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Only when you select the channel that has signal inputs as the trigger source,
can you obtain a stable trigger.
•

Edge B
Select the trigger edge type ("Rising" or "Falling") of Source B in Delay trigger inthe EdgeB item.

Set the Trigger Condition
Set the time limit condition of Delay trigger in the when item.
•>: triggers when the time difference (∆T) between the specified edges of Source
A and Source B is greater than the preset time lower limit. Click or tap the input
field of Lower to set the delay time lower limit in Delay trigger with the pop-up
numeric keypad. You can also use the corresponding multipurpose knob to set
the value.

•<: triggers when the time difference (∆T) between the specified edges of Source
A and Source B is smaller than the preset time upper limit. Click or tap the input
field of Upper to set the delay time upper limit in Delay trigger with the pop-up
numeric keypad. You can also use the corresponding multipurpose knob to set
the value.

•< >: triggers when the time difference (∆T) between the specified edges ofSource A and Source B is greater than the lower limit of the preset time andsmaller than the upper limit of the preset time. Click or tap the input field ofUpper to set the delay time upper limit in Delay trigger with the pop-up numeric
keypad. Click or tap the input field of Lower to set the delay time lower limit in
Delay trigger with the pop-up numeric keypad. You can also use thecorresponding multipurpose knob to set the upper and lower limit. The lower
time limit must be smaller than the upper time limit.

•> <: triggers when the time difference (∆T) between the specified edges ofSource A and Source B is smaller than the lower limit of the preset time or
greater than the upper limit of the preset time. Click or tap the input field ofUpper to set the delay time upper limit in Delay trigger with the pop-up numeric
keypad. Click or tap the input field of Lower to set the delay time lower limit in
Delay trigger with the pop-up numeric keypad. You can also use thecorresponding multipurpose knob to set the upper and lower limit. The lower
time limit must be smaller than the upper time limit.

Trigger ModeIn Sweep, select Auto, Normal, or Single as the trigger mode. For details, refer todescriptions in Trigger Mode.
Trigger Parameter Setting
You can refer to Trigger Holdoff and Noise Rejection to set the trigger holdoff andnoise rejection under this trigger type.
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Level Selection and Setting
After the trigger condition setting is completed, you need to adjust the trigger levelto correctly trigger the signal and obtain a stable waveform.
Click or tap the Level A/Level B input field to set the level A/level B with the pop-up
numeric keypad. You can also use the corresponding multipurpose knob to adjust
level A/level B or use the trigger level knob to adjust the level (the focus of the trigger
level knob is the last modified level). For details, refer to descriptions in Trigger Level.
The current trigger level is displayed in the trigger information label at the top of thescreen.

8.7.11

Setup/Hold Trigger
In setup&hold trigger, you need to set the clock source and data source. The setup
time starts when the data signal passes the trigger level and ends at the coming of
the specified clock edge; the hold time starts at the coming of the specified clockedge and ends when the data signal crosses the trigger level again, as shown in the
figure below. The oscilloscope triggers when the setup time or hold time is smaller
than the preset time.

T1

T1 is the setup timeT2

T2 is the hold time

Data Source
Edge

Clock Source
The data type is H

Figure 8.20 Setup/Hold Trigger
Trigger TypeClick or tap the drop-down button of Type to select "Setup/Hold".

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Figure 8.21 Setup/Hold Trigger Setting Menu
After a trigger type is selected, the current trigger setting information (including thetrigger type, source, and level) is displayed in the trigger information label at the topof the screen, as shown in the figure below. The information will change based on thetrigger settings.

Clock Source
Click or tap the drop-down button of SCL to select CH1-CH4. For details, refer to

Trigger Source. The selected trigger source is indicated in the trigger information
label at the top of the screen.
Only when you select the channel that has signal inputs as the trigger source, can you
obtain a stable trigger.
Edge Type
Select the desired clock edge type in the Slope item, and it can be set to "Rising" or"Falling".
Data Source
Click or tap the drop-down button of SDA to select CH1-CH4. For details, refer to

Trigger Source The selected trigger source is indicated in the trigger information label
at the top of the screen.
Only when you select the channel that has signal inputs as the trigger source, can you
obtain a stable trigger.
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Data Type
Select the effective pattern of the data signal in the Data Type item. It can be set to H
(high level) or L (low level).
Trigger Condition
Set the Setup/Hold trigger condition in the When item.
•

Setup: the oscilloscope triggers when the setup time is smaller than thespecified setup time. After selecting this type, click or tap the input field ofSetup to set the setup time with the pop-up numeric keypad. You can also use
the corresponding multipurpose knob to set the value.

•

Hold: the oscilloscope triggers when the hold time is smaller than the specified
hold time. After selecting this type, click or tap the input field of Hold to set thehold time with the pop-up numeric keypad. You can also use the corresponding
multipurpose knob to set the value.

•

Setup/Hold: the oscilloscope triggers when the setup time or hold time smaller
than the specified time value. After selecting this type, click or tap the input fieldof Setup and Hold respectively to set the setup and hold time with the pop-up
numeric keypad. You can also use the corresponding multipurpose knob to set
the values.

Trigger ModeIn Sweep, select Auto, Normal, or Single as the trigger mode. For details, refer todescriptions in Trigger Mode.
Trigger Parameter Setting
You can refer to Trigger Holdoff and Noise Rejection to set the trigger holdoff andnoise rejection under this trigger type.
Level Selection and Setting
After the trigger condition setting is completed, you need to adjust the trigger levelto correctly trigger the signal and obtain a stable waveform.
Click or tap the Level A/Level B input field to set the level A/level B with the pop-up
numeric keypad. You can also use the corresponding multipurpose knob to adjust
level A/level B or use the trigger level knob to adjust the level (the focus of the trigger
level knob is the last modified level). For details, refer to descriptions in Trigger Level.
The current trigger level is displayed in the trigger information label at the top of thescreen.

8.7.12

Nth Edge Trigger
The Nth edge trigger lets you to trigger on the Nth edge that occurs after a specified
idle time. For example, in the waveform as shown in the figure below, the instrument
should trigger on the second rising edge after the specified idle time (the time

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Triggering the Oscilloscope

between two neighboring rising edges), and the idle time should be within the range
between P and M (P < Idle Time < M). Wherein, M is the time between the first risingedge and its previous rising edge; P is the maximum time between the rising edges
that participate in counting.

Edge Type=
Edge Num=2
M

P

P<Idle Time<M

Figure 8.22 Nth Edge Trigger
Trigger TypeClick or tap the Type drop-down button to select "Nth Edge".

Figure 8.23 Nth Edge Trigger Setting Menu
After a trigger type is selected, the current trigger setting information (including
trigger type, trigger source, and trigger level) is displayed in the trigger information
label at the top of the screen, as shown in the figure below. The information willchange based on the trigger settings.

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Source Selection
Click or tap the Source drop-down button to select CH1-CH4. For details, refer to

Trigger Source. The selected trigger source is indicated in the trigger information
label at the top of the screen.
Only when you select the channel that has signal inputs as the trigger source, can you
obtain a stable trigger.
Edge Type
Select the input signal edge (in the Slope item) on which the oscilloscope triggers.
•

Rising: triggers on the rising edge of the input signal when the voltage level
meets the specified trigger level.

•

Falling: triggers on the falling edge of the input signal when the voltage level
meets the specified trigger level.

Idle Time
Click or tap the input field of Idle Time, and then use the pop-up numeric keypad to
set the idle time before the edge counting in Nth edge trigger. You can also use thecorresponding multipurpose knob to set the value.
Edge Count
Click or tap the input field of Edges, then use the pop-up numeric keypad to set thevalue of "N" in Nth edge trigger. You can also use the corresponding multipurpose
knob to set the value. The available range is from 1 to 65,535.
Trigger ModeIn Sweep, select Auto, Normal, or Single as the trigger mode. For details, refer todescriptions in Trigger Mode.
Trigger Parameter Setting
You can refer to Noise Rejection to set the noise rejection under this trigger type.
Trigger Level
Click or tap the Level input field to set the trigger level with the pop-up numeric
keypad. You can also use the front-panel trigger level knob or the corresponding
multipurpose knob to set the trigger level. For details, refer to descriptions in Trigger

Level. The current trigger level is displayed in the trigger information label at the topof the screen.

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8.7.13

RS232 Trigger
RS232 bus is a serial communication mode used in data transmission between PCs or
between a PC and a terminal. In RS232 serial protocol, a character is transmitted as aframe of data. The frame consists of 1 start bit, 5-8 data bits, 1 check bit, and 1-2 stop
bits. Its format is as shown in the figure below. This series oscilloscope triggers when
detecting the start frame, error frame, check error, or the specified data of the RS232
signal.

1 bit

5~8 bits

1 bit

1~2 bits

Start Bit

Data Bit

Check Bit

Stop Bit

Figure 8.24 Schematic Diagram of RS232 Protocol
Trigger TypeClick or tap the drop-down button of Type to select "RS232".

Figure 8.25 RS232 Trigger Setting Menu
After a trigger type is selected, the current trigger setting information (including thetrigger type, source, and level) is displayed in the trigger information label at the topof the screen, as shown in the figure below. The information will change based on thetrigger settings.

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Source Selection
Click or tap the Source drop-down button to select CH1-CH4. For details, refer to

Trigger Source. The selected trigger source is indicated in the trigger information
label at the top of the screen.
Only when you select the channel that has signal inputs as the trigger source, can you
obtain a stable trigger.
Polarity
Select the polarity of data transmission in the Polarity item. It can be set to "Positive"or "Negative".

Trigger Condition
Set the desired trigger condition in the When item.
•

Start: triggers on the start frame position.

•

Error: triggers when an error frame is detected.

•

Check Error: triggers when a check error is detected.

•

Data: triggers on the last bit of the preset data bits. Click or tap the input field ofData, and then use the pop-up numeric keypad to set the data of RS232 trigger.
You can also use the corresponding multipurpose knob to set the value.

Baud Rate
You can select the baud rate of data transmission (i.e. specifies a clock frequency).
Click or tap the drop-down button of Baud Rate, then select the preset baud rate.
The available baud rates include 50 bps, 75 bps, 110 bps, 134 bps, 150 bps, 300 bps,
and etc. You can also self-define the baud rate.
Data Bits
Indicates the number of bits per frame. Click or tap the drop-down button of Data
Bits to select the desired data bits. The available data bits include "5 Bits", "6 Bits", "7Bits", and "8 Bits".
Stop Bit
Indicates when to stop outputting data. Select the desired stop bit in the Stop Bit
item. The available data bits include 1 Bit, 1.5 Bits, and 2 Bits.

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ParityUsed to check whether the data are properly transmitted. Select None, Even, or Odd
in the Parity item.
•

None: indicates that no check bit appears during the transmission.

•

Even: indicates that the total number of "1" in the data bit and check bit is aneven number. For example, when 0x55 (01010101) is sent, "0" should be added
to the check bit.

•

Odd: indicates that the total number of "1" in the data bit and check bit is an
odd number. For example, when 0x55 (01010101) is sent, "1" should be added tothe check bit.

Trigger ModeIn Sweep, select Auto, Normal, or Single as the trigger mode. For details, refer todescriptions in Trigger Mode.
Trigger Parameter Setting
You can refer to Noise Rejection to set the noise rejection under this trigger type.
Trigger Level
Click or tap the Level input field to set the trigger level with the pop-up numeric
keypad. You can also use the front-panel trigger level knob or the corresponding
multipurpose knob to set the trigger level. For details, refer to descriptions in Trigger

Level. The current trigger level is displayed in the trigger information label at the topof the screen.

8.7.14I2C Trigger
I2C is a 2-wire serial bus used to connect the microcontroller and its peripheraldevice. It is a bus standard widely used in the microelectronic communication control
field.
The I2C serial bus consists of SCL and SDA. Its transmission rate is determined by SCL,
and its transmission data is determined by SDA, as shown in the figure below. The
instrument triggers on the start condition, restart, stop, missing acknowledgment,
specific device address, or data value. Besides, it can also trigger on the specificdevice address and data values at the same time.

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Figure 8.26 Sequence Diagram of I2C Protocol
Trigger TypeClick or tap the drop-down button of Type to select "I2C".

Figure 8.27 I2C Trigger Setting Menu
After a trigger type is selected, the current trigger setting information (including thetrigger type, source, and level) is displayed in the trigger information label at the topof the screen, as shown in the figure below. The information will change based on thetrigger settings.

Source Selection
Click or tap the drop-down buttons of SCL and SDA to select CH1-CH4 to specify thesources of SCL and SDA respectively. For details, refer to descriptions in Trigger
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Source. The selected trigger source is indicated in the trigger information label at the
top of the screen.
Only when you select the channel that has signal inputs as the trigger source, can you
obtain a stable trigger.
Trigger Condition
Set the desired trigger condition in the When item.
•

Start: triggers when SDA data transitions from high level to low level while SCL
is high level.

•

Stop: triggers when SDA data transitions from low level to high level while SCL ishigh level.

•

Restart: triggers when another start condition occurs before a stop condition.

•

MissedAck: triggers when ACK is 1.

•

Address: the trigger searches for the specified address value. When this event
occurs, the oscilloscope will trigger on the read/write bit. After this trigger
condition is selected:-

Click or tap the drop-down button of Direction to select "Write", "Read", or"R/W".
This setting is not available when AddrBits is set to "8 Bits".

-

Click or tap the drop-down button of AddrBits to select the desired
address bits. The available address bits are "7 Bits", "8 Bits", and "10 Bits".

-

Click or tap the input field of Address, and then use the pop-up numeric
keypad to set the address of I2C trigger. You can also use the corresponding
multipurpose knob to set the value.

•

Data: the trigger searches for the specified data value on the data line (SDA).
When this event occurs, the oscilloscope will trigger on the clock line (SCL)
transition edge of the last bit of data. After this trigger condition is selected, you
can set the following parameters.
-

Click or tap the drop-down button of AddrBits to select the desired
address bits. The available address bits are "7 Bits", "8 Bits", and "10 Bits".

-

Click or tap the input field of Bytes, and then use the pop-up numeric
keypad to set the length of the data. You can also use the corresponding
multipurpose knob to set the value. Its range is from 1 to 5.

-

Click or tap the input field of Data, and then the "Format" interface is will
displayed. You can select "Bin" or "Hex" data format.

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Figure 8.28 Binary Format Setting

Figure 8.29 Hexadecimal Format Setting•

A&D: the oscilloscope searches for the specified address and data at the sametime, then triggers when both the address and data meet the conditions. After
this condition is selected, you need to set the sub Data-menu items such as
Direction, Bytes, AddrBits, Address, and Data. For the setting methods, refer todescriptions in "Address" and "Data" conditions.

Trigger ModeIn Sweep, select Auto, Normal, or Single as the trigger mode. For details, refer todescriptions in Trigger Mode.

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Trigger Parameter Setting
You can refer to Noise Rejection to set the noise rejection under this trigger type.
Level Selection and Setting
After the trigger condition setting is completed, you need to adjust the trigger levelto correctly trigger the signal and obtain a stable waveform.
•

Level A
Click or tap the input field of Level A to input the level of SCL with the pop-up
numeric keypad. You can also use the corresponding multipurpose knob to set
the value. When the level A information is displayed in the trigger label, you canalso use the trigger level knob to adjust the level of SCL. For details, refer todescriptions in Trigger Level.

•

Level B
Click or tap the input field of Level B to input the level of SDA with the pop-up
numeric keypad. You can also use the corresponding multipurpose knob to set
the value. When the level B information is displayed in the trigger label, you canalso use the trigger level knob to adjust the level of SDA. For details, refer todescriptions in Trigger Level.

8.7.15SPI Trigger
In SPI trigger, after the CS or timeout condition is satisfied, the oscilloscope triggers
when the specified data is found. When using SPI trigger, you need to specify the CLKclock sources and MISO data sources.
The figure below shows the sequential chart of SPI bus.

CS

SCL
SDA

D7

D6

D5

D4

D3

D2

D1

D0

Figure 8.30 Sequential Chart of SPI Bus
Trigger TypeClick or tap the drop-down button of Type to select "SPI".

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Figure 8.31 SPI Trigger Setting Menu
After a trigger type is selected, the current trigger setting information (including
trigger type, trigger source, and trigger level) is displayed in the trigger information
label at the top of the screen, as shown in the figure below. The information willchange based on the trigger settings.

Source Selection
Click or tap the drop-down buttons of CLK and MISO to select CH1-CH4 to specify
the sources of CLK and MISO respectively. For details, refer to descriptions in Trigger

Source. The selected trigger source is indicated in the trigger information label at the
top of the screen.
Only when you select the channel that has signal inputs as the trigger source, can you
obtain a stable trigger.
Edge Type
Select the desired clock edge type in Slope.
•

Rising: samples the MISO data on the rising edge of the clock.

•

Falling: samples the MISO data on the falling edge of the clock.

Trigger Condition
Select the desired trigger condition in When.

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Triggering the Oscilloscope•With CS: if the CS signal is valid, the oscilloscope will trigger when the data
(SDA) satisfying the trigger conditions is found.
-

Click or tap the drop-down button of CS to select CH1-CH4 as the CS signal
line.

-

After selecting this condition, you can click or tap "Positive" (high level isvalid) or "Negative" (low level is valid) in CS Mode.

•

Timeout: the oscilloscope starts to search for the data (MISO) on which totrigger after the clock signal (CLK) stays in the idle state for a specified period oftime. After selecting this condition, you can click or tap the Timeout input field,
then use the numeric keypad to set the idle time. You can also use thecorresponding multipurpose knob to set the value. The range is from 8 ns to 10s.

NOTE
As DHO812/DHO802 only has two channels, the "With CS" is not available.

Data
Click or tap the of field of Data, and then the "Format" interface is displayed. You can
set the data bit that needs to be triggered. For details, refer to descriptions in I2C

Trigger.
Data Bits
Click or tap the input field of DataBits, and then use the pop-up numeric keypad to
set the number of bits in the serial data string. You can also use the corresponding
multipurpose knob to set the value. The number of bits in the string can be set to any
integer ranging from 4 to 32.
Trigger ModeIn Sweep, select Auto, Normal, or Single as the trigger mode. For details, refer todescriptions in Trigger Mode.
Trigger Parameter Setting
You can refer to Noise Rejection to set the noise rejection under this trigger type.
Level Selection and Setting
After the trigger condition setting is completed, you need to adjust the trigger levelto correctly trigger the signal and obtain a stable waveform.
•

Level A
Click or tap the input field of Level A to input the level of CLK with the pop-up
numeric keypad. You can also use the corresponding multipurpose knob or thetrigger level knob to adjust the level of CLK. When the level A information isdisplayed in the trigger label, you can also use the trigger level knob to adjust

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the level of CLK. For details, refer to descriptions in Trigger Level. The current
trigger level is displayed in the trigger information label at the top of the screen.
•

Level B
Click or tap the input field of Level B to input the level of MISO with the pop-up
numeric keypad. You can also use the corresponding multipurpose knob toadjust the level of MISO. When the level B information is displayed in the trigger
label, you can also use the trigger level knob to adjust the level of MISO. For
details, refer to descriptions in Trigger Level. The current trigger level is displayedin the trigger information label at the top of the screen.

•

Level C
Click or tap the input field of Level C to input the level of CS with the pop-up
numeric keypad. You can also use the corresponding multipurpose knob toadjust the level of CS. When the level C information is displayed in the trigger
label, you can also use the trigger level knob to adjust the level of CS. For details,
refer to descriptions in Trigger Level. The current trigger level is displayed in thetrigger information label at the top of the screen.

8.8

Trigger Output Connector
The rear-panel trigger output connector ([AUX OUT]) of this series can output trigger
signals determined by the current setting (hardware trigger).
Click or tap> Utility. Click or tap Setup, and then select "TrigOut" in Aux Out. A

signal which reflects the current oscilloscope capture rate can be output from [AUX
OUT] connector each time a trigger is generated by the oscilloscope. If this signal isconnected to a waveform display device to measure the frequency, the measurement
result is the same as the current capture rate.
If "PassFail" is selected in Aux Out, the instrument can output a pulse from the [AUX
OUT] connector when a pass/failed event is detected during the pass/fail test.

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9

Math Operation
This series oscilloscopes can realize multiple math operations between waveforms ofdifferent channels, including arithmetic operation, spectrum operation, logic
operation, function operation, and digital filter. You can access the Math menu in thefollowing ways.
•

Click or tap the function navigation icon

at the lower-left corner of thescreen, and then select Math to enter the "Math" menu.
•

Click or tap the Math button on the toolbar at the upper-right corner of thescreen to enter the "Math" menu.

•

Click or tap M1-M4 in the Math label at the bottom of the screen to open the"Math" window. You can also click or tap the Math label and then select a label
from M1-M4 to enter the corresponding Math window. Then click or tap theM1-M4 label again, or theicon at the upper-right corner of the window toenter the "Math" menu. The Math label is as shown in the figure below.

•

Press the front-panel

key to enter the "Math" menu.

Figure 9.1 Math Menu
This oscilloscope provides four math operations: Math1, Math2, Math3, and Math4. In
the Math menu, you can select the desired math operation type by clicking or
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Math Operation

tapping the Math1-Math4 label or by sliding the menu left and right. This manualtakes Math1 as an example to introduce math operation.
In the Math menu, click or tap the Operation on/off switch to show or hide thewaveform display window of the operation results. By default, it is OFF. When "ON" isselected for Math1-Math4, the menu as shown in the figure below is displayed on thescreen.

Figure 9.2 Waveform Display Window of the Operation Results
You can drag the title bar of the display window to change the position of theat the upper-right corner of the window to close

window. You can also click or tap
it.

9.1

Arithmetic Operation
In the Math menu, click or tap the Operator drop-down button to select the desired
math operation. The arithmetic operations supported by this oscilloscope include A+B, A-B, A×B, and A÷B.
•A+B adds the waveform voltage values of signal source A and B point by pointand displays the results.

•

A-B subtracts the waveform voltage values of signal source B from that of source
A point by point and displays the results.

•

A×B multiplies the waveform voltage values of signal source A and B point bypoint and displays the results.

•

A÷B divides the waveform voltage values of signal source A by that of source B
point by point and displays the results. It can be used to analyze the Multiple
relation of the two channels waveforms.

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Math Operation

TIP
When the voltage of signal source B is 0 V, the division result is treated as 0.

Figure 9.3 Arithmetic Operation Menu
Operation Result Display Window
Click or tap the Operation on/off switch to enable the display of the arithmetic
operation result window. The source and the vertical scale parameters are displayed
at the top of the window, as shown in the figure below.
Label Source Sample Rate

Vertical Scale

Figure 9.4 Operation Result Display Window

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SourceClick or tap the drop-down button of SourceA or SourceB to select CH1-CH4 or
Ref1-Ref10. When a source channel is selected, the selected channel automaticallyswitches to the ON state.
TIP
Besides CH1-CH4 and Ref1-Ref10, the Math2 source can be set to Math1; the Math3 source
can be set to Math1 or Math2; the Math4 source can be set to Math1, Math2, or Math3.
Selecting a Math automatically enables its window display and sets its Operation on/off switch
to ON.

Scale
Scale is used to set the vertical scale of the operation result. You can set the verticalscale in the following ways.
•

In Math menu, rotate the corresponding multipurpose knob on the front panel
or click or tap the icon at the right side of the input field of Scale to increase or
decrease the scale value. You can also click or tap the input field to input a
specific value with the displayed numeric keypad.

•

Close the menu and then adjust the vertical scale with the pinch&stretch gestureon the touch screen. You can also rotate the multipurpose knob 1 on the front
panel to adjust the vertical scale. Please refer to Front Panel Overview toconfigure the front-panel multipurpose knobs.

OffsetOffset is used to set the vertical offset of the operation result. You can set the verticaloffset in the following ways.
•

In Math menu, rotate the corresponding multipurpose knob on the front panel
or click or tap the icon at the right side of the input field of Offset to increase or
decrease the scale value. You can also click or tap the input field to input a
specific value with the displayed numeric keypad.

•

Close the menu and then adjust the vertical offset with the drag gesture on thetouch screen. You can also rotate the multipurpose knob 2 on the front panel toadjust the vertical offset. Please refer to Front Panel Overview to configure thefront-panel multipurpose knobs.

InvertInvert is used to enable or disable the inverted display of the waveform. When the
Invert function is disabled, the waveform is displayed normally; when enabled, thevoltage values of the displayed waveform are inverted.
Waveform
This oscilloscope provides Main and Zoom for the measurement range.
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Math Operation•

Main indicates that the measurement range is within the main time base region.

•

Zoom indicates that the measurement range is within the zoomed time baseregion.

To use "Zoom", first enable the Zoom Mode (Delayed Sweep) in the Horizontal
System menu.
ExpandThe oscilloscope supports two vertical expansion modes: GND (default) and Center.
•

GND: When the vertical scale is changed, the math operation waveform will
expand or compress about the ground level of the signal.

•

Center: When the vertical scale is changed, the math operation waveform will
expand or compress about the center of the display.

Auto Set
Click or tap AutoSetting to adjust the vertical scale and the offset of the operation
results to the optimal value according to the current configuration for you to better
observe.
Label
It is used to set the label for the math operation results. For setting methods, refer todescriptions in To Turn the Channel Label Display On/Off.
Grid
For setting methods, refer to the descriptions in To Set the Screen Grid.

9.2

Function Operation
In the Math menu, click or tap the Operator drop-down button to select the desired
function operation. The available function operation types of this oscilloscope include
Intg, Diff, Sqrt, Lg (Base 10 Exponential), Ln, Exp, Abs, and AX+B.
•

Intg: calculates the integral of the selected source. For example, you can use
integral to measure the area under a waveform or the pulse energy.

•

Diff: calculates the discrete time derivative of the selected source. For example,
you can use differentiate to measure the instantaneous slope of a waveform.

•

Sqrt: calculates the square roots of the selected source point by point anddisplays the results.

•

Lg (Base 10 Exponential): calculates the base 10 exponential of the selectedsource point by point and displays the results.

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Ln: calculates the natural logarithm (Ln) of the selected source point by pointand displays the results.

•

Exp: calculates the exponential of the selected source point by point anddisplays the results.

•

Abs: calculates the absolute value of the selected source and displays the results.

•

AX+B: applies a linear function to the selected source, and displays the results.

Figure 9.5 Function Operation Menu
Operation Result Display Window
Click or tap the Operation on/off switch to enable or disable the display of theoperation result window. The source and the vertical scale parameters are displayed
at the top of the window, as shown in the figure below.

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Math Operation

Label Source

Sample Rate

Vertical Scale

Figure 9.6 Operation Result Display Window
SourceClick or tap the Source drop-down button to select the source from CH1-CH4 or
Ref1-Ref10. When a source channel is selected, the selected channel automaticallyswitches to the ON state.
TIP
Besides CH1-CH4 and Ref1-Ref10, the Math2 source can be set to Math1; the Math3 source
can be set to Math1 or Math2; the Math4 source can be set to Math1, Math2, or Math3.
Selecting a Math automatically enables its window display and sets its Operation on/off switch
to ON.

Auto Set
Click or tap AutoSetting to adjust the vertical scale and the offset of the operation
results to the optimal value according to the current configuration for you to better
observe.
Scale
Scale is used to set the vertical scale of the operation result. You can set the verticalscale in the following ways.
•

In Math menu, rotate the corresponding multipurpose knob on the front panel
or click or tap the icon at the right side of the input field of Scale to increase or
decrease the scale value. You can also click or tap the input field to input a
specific value with the displayed numeric keypad.

•

Close the menu and then adjust the vertical scale with the pinch&stretch gestureon the touch screen. You can also rotate the multipurpose knob 1 on the front

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panel to adjust the vertical scale. Please refer to Front Panel Overview toconfigure the front-panel multipurpose knobs.
OffsetOffset is used to set the vertical offset of the operation result. You can set the verticaloffset in the following ways.
•

In Math menu, rotate the corresponding multipurpose knob on the front panel
or click or tap the icon at the right side of the input field of Offset to increase or
decrease the scale value. You can also click or tap the input field to input a
specific value with the displayed numeric keypad.

•

Close the menu and then adjust the vertical offset with the drag gesture on thetouch screen. You can also rotate the multipurpose knob 2 on the front panel toadjust the vertical offset. Please refer to Front Panel Overview to configure thefront-panel multipurpose knobs.

InvertInvert is used to enable or disable the inverted display of the waveform. When the
Invert function is disabled, the waveform is displayed normally; when enabled, thevoltage values of the displayed waveform are inverted.
Waveform
This oscilloscope provides Main and Zoom for the measurement range.
•

Main indicates that the measurement range is within the main time base region.

•

Zoom indicates that the measurement range is within the zoomed time baseregion.

To use "Zoom", first enable the Zoom Mode (Delayed Sweep) in the Horizontal

System menu.
Label
It is used to set the label for the math operation results. For setting methods, refer todescriptions in To Turn the Channel Label Display On/Off.
ExpandThe oscilloscope supports two vertical expansion modes: GND (default) and Center.
•

GND: When the vertical scale is changed, the math operation waveform will
expand or compress about the ground level of the signal.

•

Center: When the vertical scale is changed, the math operation waveform will
expand or compress about the center of the display.

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Math Operation

Grid
For setting methods, refer to the descriptions in To Set the Screen Grid.
Parameter Setting•

When the operator is "Intg", click or tap the Offset input field and use the popup numeric keypad to set the DC offset calibration factor of the input signal. You
can also use the corresponding multipurpose knob to set the value.

•

When the operator is "Diff", click or tap Smooth input field and use the pop-up
numeric keypad to set the number of smooth times for the differential
operation. You can also use the corresponding multipurpose knob to set thevalue.

•

When the operator is "AX+B", click or tap A/B input field and use the pop-up
numeric keypad to set the A/B value. You can also use the corresponding
multipurpose knob to set the value.

9.3

FFT Operation
FFT (Fast Fourier Transform) is used to transform time-domain signals to frequencydomain components (frequency spectrum). This oscilloscope provides FFT operation
function which enables you to observe the time-domain waveform and spectrum of
the signal at the same time. FFT operation can facilitate the following works:•

Measure harmonic components and distortion in the system;•

Display the characteristics of the noise in DC power;•

Analyze vibration.

In the Math menu, click or tap the Operator drop-down button to select FFT toaccess the menu as shown in Figure 9.7 .

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Figure 9.7 FFT Operation Menu
Operation On/Off
Click or tap the Operation on/off switch to enable the FFT operation result window.
The parameters such as center frequency, frequency range, and resolution aredisplayed at the top of the window, as shown in the figure below. FFT resolution is thequotient of the sample rate and the number of FFT points. If the number of FFT points
is a fixed value, then the higher the sample rate, the higher the resolution.
NOTE
The number of FFT analysis points can be 1 Mpts in maximum.

Label Source

Samplerate

CenterFrequency

Frequency
Resolution
Span

Figure 9.8 FFT Operation Window
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SourceClick or tap the Source drop-down button to select CH1, CH2, CH3, or CH4 as thesource. When a source channel is selected, the selected channel automaticallyswitches to the ON state.
Auto Set
Click or tap AutoSetting to adjust the vertical scale and the offset of the operation
results to the optimal value according to the current configuration for you to better
observe.
Frequency Range
In X, select "Span-Center" or "Start-End" mode and then configure the frequency
range setting.
•Span-Center (frequency span to center frequency): Span specifies thefrequency range represented by the width from the frequency at the left side of
the window to the frequency at the right side of the window. Divide thefrequency span by 10 to obtain the frequency per division.
Click or tap the Center input field to set the frequency of the frequency-domain
waveform relative to the horizontal center of the screen. You can also use thecorresponding multipurpose knob to set the value. Its range is from 5 Hz to 625
MHz. Click or tap the Span input field to set the frequency span with the pop-up
numeric keypad. You can also use the corresponding multipurpose knob to set
the value. Its range is from 10 Hz to 625 MHz.

•

Start-End (start frequency to stop frequency): Start frequency specifies thefrequency at the left side of the window. Click or tap the Start input field to set
the start frequency with the pop-up numeric keypad or use the corresponding
multipurpose knob to set the value. Its range is from 0 Hz to (stop frequency-10Hz). Stop frequency specifies the frequency at the right side of the window. Clickor tap the End input field to set the stop frequency with the pop-up numeric
keypad or use the corresponding multipurpose knob to set the value. Its range isfrom (start frequency + 10 Hz) to 625 MHz. By default, it is 10 MHz.

Vertical Scale/Offset
In Unit item, you can select dBm/dBV or Vrms as the unit for Scale and Offset.
For how to set the Scale, refer to the descriptions in Scale of "Arithmetic Operation".
For how to set the Offset, refer to the descriptions in Offsetof "Arithmetic Operation".
Window Function
Spectral leakage can be considerably minimized when a window function is used. The
oscilloscope provides 6 FFT window functions which have different characteristics andare applicable to measure different waveforms, as shown in the table below. You needto select the window function according to the characteristics of the waveform to be

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measured. Click or tap the Window drop-down button to select the desired windowfunction.
Table 9.1 Window Function
Window
Function

Waveforms Applicable to theCharacteristics

Window Function
Transient or short pulse, the signal
levels before and after theBest frequency resolution
Rectangular

Poorest amplitude resolution
Similar to the situation when no
window is applied

multiplication are basically the same
Sine waveforms with the same
amplitudes and rather similarfrequencies
Wide band random noise withrelatively slow change of waveform
spectrum

Blackman-Best amplitude resolution

Single frequency signal, searching

HarrisPoorest frequency resolution

for higher order harmonics

Better frequency resolution and
Hanningpoorer amplitude resolution
compared with RectangularHamming

A little bit better frequency
resolution than Hanning

Sine, periodic, and narrow band
random noise
Transient or short pulse, the signal
levels before and after themultiplication are rather different
Measure the signal that has no

Flattop

Measure the signals accurately

accurate reference and requires anaccurate measurement
Measure the narrow band signal

Triangle

Better frequency resolution

and that has strong noiseinterference

Color Grade
Click or tap the Color Grade on/off switch to enable/disable the color grade displayof FFT operation results. When it is enabled, different colors are displayed on thescreen to indicate the times of data acquisition or acquisition probability. Click or tap
the Reset button for the Color Grade menu to clear the color grade display anddisplay the color grade again.

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Label
It is used to set the label for the math operation results. For setting methods, refer todescriptions in To Turn the Channel Label Display On/Off.
Grid
For setting methods, refer to the descriptions in To Set the Screen Grid.
Peak Search
Click or tap the icon

at the right side of Peak Search to enter the peak searchmenu, as shown in the figure below.

Figure 9.9 Peak Search•

Peak Search ON/OFF: click or tap the Peak Search on/off switch to enable ordisable the display of the peak search window. By default, it is OFF.

•

Peak Number: click or tap the input field for the Peak Number menu item anduse the pop-up numeric keypad to set the number of peaks. You can also use
the corresponding multipurpose knob to set the value. Its range is from 1 to 15.
Its default value is 5.

•

Threshold: click or tap the input field for the Threshold menu item to set thethreshold of the peak with the pop-up numeric keypad. You can also use thecorresponding multipurpose knob to set the value. The range of the threshold isrelated to the current FFT scale and offset.

•

Excursion: click or tap the Excursion input field to set the excursion of the peakor use the corresponding multipurpose knob to set the value. The minimum
value of Excursion is 0 and its unit is consistent with that of FFT.

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Table Order: in Table Order, select Amp Order or Freq Order as the sorting
mode. By default, it is "Amp Order".

Click or tap Export, then the save setting interface is displayed. You can export thepeak search results to the internal memory or the external USB storage device in CSV
format. In the menu, click or tap File Name input field to set the file name; click or
tap File Path input field and the disk management menu (Disk Management) is
displayed. Select the desired location to save the file and then click or tap Save tosave the peak search results.
Clicking or tapping the icon

at the right side of Peak Search can close the peaksearch menu.

9.4

Logic Operation
In the Math menu, click or tap the Operator drop-down button to select the desired
math operation. The logic operations supported by this oscilloscope include A&&B,
A||B, A^B, and !A. After selecting the desired logic operation in the drop-down buttonof Operator, you can configure its settings for the selected logic operation type.

Figure 9.10 Logic Operation Menu•

A&&B: Performs logic "AND" operation on the waveform voltage values of thespecified sources point by point and displays the results. In operation, when thevoltage value of the source channel is greater than the threshold of thecorresponding channel, it is regarded as logic "1"; otherwise it is logic "0". The
results of logic AND operation of two binary bits are shown in Table 9.2 Logic

Operation .

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A||B: Performs logic "OR" operation on the waveform voltage values of thespecified sources point by point and displays the results. In operation, when thevoltage value of the source channel is greater than the threshold of thecorresponding channel, it is regarded as logic "1"; otherwise it is logic "0". The
results of logic OR operation of two binary bits are shown in Table 9.2 Logic

Operation .
•A^B: Performs logic "XOR" operation on the waveform voltage values of thespecified sources point by point and displays the results. In operation, when thevoltage value of the source channel is greater than the threshold of thecorresponding channel, it is regarded as logic "1"; otherwise it is logic "0". The
results of logic XOR operation of two binary bits are shown in Table 9.2 Logic

Operation .
•!A: Performs logic "NOT" operation on the waveform voltage values of thespecified sources point by point and displays the results. In operation, when thevoltage value of the source channel is greater than the threshold of thecorresponding channel, it is regarded as logic "1"; otherwise it is logic "0". The
results of logic "NOT" operation of one binary bit are shown in Table 9.2 Logic

Operation .
Table 9.2 Logic Operation
A

B

A&&B

A||B

A^B

!A

0

0

0

0

0

1

0

1

0

1

1

1

1

0

0

1

1

0

1

1

1

1

0

0

Operation Result Display Window
Click or tap the Operation on/off switch to enable the display of the operation result
window. The source and the waveform sizes parameters are displayed at the top of
the window, as shown in the figure below.

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Label Source Waveform Size

Figure 9.11 Operation Result Display Window
SourceClick or tap the drop-down button of SourceA or SourceB to select CH1, CH2, CH3,
or CH4. When a source channel is selected, the selected channel automaticallyswitches to the ON state.
Waveform Size
You can select "Small", "Medium", or "Large" as the the waveform display mode.

OffsetOffset is used to set the vertical offset of the operation result. You can set the verticaloffset in the following ways.
•

In Math menu, rotate the corresponding multipurpose knob on the front panel
or click or tap the icon at the right side of the input field of Offset to increase or
decrease the scale value. You can also click or tap the input field to input a
specific value with the displayed numeric keypad.

•

Close the menu and then adjust the vertical offset with the drag gesture on thetouch screen. You can also rotate the multipurpose knob 2 on the front panel toadjust the vertical offset. Please refer to Front Panel Overview to configure thefront-panel multipurpose knobs.

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Sensitivity
Sets the sensitivity of the digital signal converted from the analog signal on thesource. Click or tap the Sensitivity input field to set the sensitivity with the pop-up
numeric keypad or use the corresponding multipurpose knob to set the value. For
details, refer to Parameter Setting Method.
Waveform
This oscilloscope provides Main and Zoom for the measurement range.
•

Main indicates that the measurement range is within the main time base region.

•

Zoom indicates that the measurement range is within the zoomed time baseregion.

To use "Zoom", first enable the Zoom Mode (Delayed Sweep) in the Horizontal

System menu.
Threshold
Click or tap the threshold input field of the specified channel and use the pop-up
numeric keypad to set the threshold or use the corresponding multipurpose knob to
set the value.

Label
It is used to set the label for the math operation results. For setting methods, refer todescriptions in To Turn the Channel Label Display On/Off.
Grid
For setting methods, refer to the descriptions in To Set the Screen Grid.

9.5

Digital Filter
In the Math menu, click or tap the Operator drop-down button to select the desired
math operation. The digital filters supported by this oscilloscope include: low-passfilter, high-pass filter, band-pass filter, and band-stop filter.
•

LowPass only allows the signals whose frequencies are lower than the current
upper limit frequency to pass.

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HighPass only allows the signals whose frequencies are higher than the current
lower limit frequency to pass.

•

BandPass only allows the signals whose frequencies are higher than the current
lower limit frequency and lower than the current upper limit frequency to pass.

•

BandStop only allows the signals whose frequencies are lower than the current
lower limit frequency or higher than the current upper limit frequency to pass.

Figure 9.12 Digital Filter Menu
Operation Result Display Window
Click or tap the Operation on/off switch to enable the display of the operation result
window. The source and the vertical scale parameters are displayed at the top of thewindow as shown in the figure below.

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Label Source

SampleRate

Vertical
Scal

Figure 9.13 Operation Result Display Window
SourceClick or tap the Source drop-down button to select from CH1-CH4 or Ref1-Ref10.
When a source channel is selected, the selected channel automatically switches to the
ON state.
TIP
Besides CH1-CH4 and Ref1-Ref10, the Math2 source can be set to Math1; the Math3 source
can be set to Math1 or Math2; the Math4 source can be set to Math1, Math2, or Math3.
Selecting a Math automatically enables its window display and sets its Operation on/off switch
to ON.

Auto Set
Click or tap AutoSetting to adjust the vertical scale and the offset of the operation
results to the optimal value according to the current configuration for you to better
observe.
Scale
Scale is used to set the vertical scale of the operation result. You can set the verticalscale in the following ways.
•

In Math menu, rotate the corresponding multipurpose knob on the front panel
or click or tap the icon at the right side of the input field of Scale to increase or
decrease the scale value. You can also click or tap the input field to input a
specific value with the displayed numeric keypad.

•

Close the menu and then adjust the vertical scale with the pinch&stretch gestureon the touch screen. You can also rotate the multipurpose knob 1 on the front

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panel to adjust the vertical scale. Please refer to Front Panel Overview toconfigure the front-panel multipurpose knobs.
OffsetOffset is used to set the vertical offset of the operation result. You can set the verticaloffset in the following ways.
•

In Math menu, rotate the corresponding multipurpose knob on the front panel
or click or tap the icon at the right side of the input field of Offset to increase or
decrease the scale value. You can also click or tap the input field to input a
specific value with the displayed numeric keypad.

•

Close the menu and then adjust the vertical offset with the drag gesture on thetouch screen. You can also rotate the multipurpose knob 2 on the front panel toadjust the vertical offset. Please refer to Front Panel Overview to configure thefront-panel multipurpose knobs.

InvertInvert is used to enable or disable the inverted display of the waveform. When the
Invert function is disabled, the waveform is displayed normally; when enabled, thevoltage values of the displayed waveform are inverted.
Waveform
This oscilloscope provides Main and Zoom for the measurement range.
•

Main indicates that the measurement range is within the main time base region.

•

Zoom indicates that the measurement range is within the zoomed time baseregion.

To use "Zoom", first enable the Zoom Mode (Delayed Sweep) in the Horizontal

System menu.
Frequency Limit•

LowPass: click or tap the ωc input field and use the pop-up numeric keypad to
set the upper limit frequency or use the corresponding multipurpose knob to set
the value.

•

HighPass: click or tap the ωc input field and use the pop-up numeric keypad to
set the lower limit frequency or use the corresponding multipurpose knob to set
the value.

•

BandPass: click or tap the ωc1 input field and use the pop-up numeric keypad
to set the lower limit frequency. Click or tap the ωc2 input field and use the popup numeric keypad to set the upper limit frequency. You can also use thecorresponding multipurpose knob to set the lower/upper limit frequency.

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BandStop: click or tap the ωc1 input field and use the pop-up numeric keypad
to set the lower limit frequency. Click or tap the ωc2 input field and use the popup numeric keypad to set the upper limit frequency. You can also use thecorresponding multipurpose knob to set the lower/upper limit frequency.

The settable ranges of the upper and lower limit frequencies are related to the Mathsample rate (displayed at the bottom of the screen when the Math function isenabled). The sample rate of the analog channel or the changes of the memory depth
can affect the Math sample rate.
Label
It is used to set the label for the math operation results. For setting methods, refer todescriptions in To Turn the Channel Label Display On/Off.
ExpandThe oscilloscope supports two vertical expansion modes: GND (default) and Center.
•

GND: When the vertical scale is changed, the math operation waveform will
expand or compress about the ground level of the signal.

•

Center: When the vertical scale is changed, the math operation waveform will
expand or compress about the center of the display.

Grid
For setting methods, refer to the descriptions in To Set the Screen Grid.

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10

Measurements
DHO800 series oscilloscope provides the quick measurements after "Auto" is selected,
auto measurements for 41 waveform parameters, as well as the cursor measurement
function.

10.1

Auto Scale
When the oscilloscope is correctly connected and has detected a valid input signal,
click or tap the function navigation icon

> Auto or press the front-panel

key to enable the waveform auto setting function and open the auto setting function
menu.

•

Click or tap the first icon, and then two periods of the signal are automaticallydisplayed on the screen. Meanwhile, the system will make measurements for the"period" and "frequency" of the currently displayed waveform. The measurement
results are displayed in the "Result" bar at the right side of the screen.

•

Click or tap the second icon, and then multiple periods of the signal areautomatically displayed on the screen. Meanwhile, the system will makemeasurements for the "period" and "frequency" of the currently displayed
waveforms in multiple periods. The measurement results are displayed in the"Result" bar at the right side of the screen.

•

Click or tap the third icon to enable the "rise time" measurement item. The
measurement results are displayed in the "Result" bar at the right side of thescreen. By default, it is intended for the fast edge signal.

•

Click or tap the fourth icon to enable the "fall time" measurement item. The
measurement results are displayed in the "Result" bar at the right side of thescreen. By default, it is intended for the fast edge signal.

•

Click or tap the fifth icon to cancel the auto setting and recovers to theparameter settings prior to clicking or tapping Auto.

•

Click or tap the sixth icon to enter the Auto Config sub-menu under the Utility
menu. For details, please refer to Auto Config.

TIP
The waveform auto setting function requires that the frequency of the signal should be greaterthan or equal to 35 Hz, and the amplitude greater than or equal to 10 mV. If those conditions
are not met, the waveform auto setting function may be invalid.

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10.2

Auto Measurements
You can enter the Measure menu in the following ways.
•

Click or tap the function navigation icon

at the lower-left corner of thescreen, and then select Measure to enter the "Measure" menu.
•

Press the front-panel•

Click or tap the Measure button on the toolbar to enter the "Measure" menu.

•

In Vertical System menu, click or tap the Measure button to enter the "Measure"

key to enter the "Measure" menu.

menu.

10.2.1

Measurement Parameter
This oscilloscope allows you to set the measurement source, enable or disable the allmeasurement function, the statistical function, and etc. You can make quick
measurements for many waveform parameters. The measurement results will be
displayed in the Result sidebar at the right section of the screen.
TIP
If there is no signal input for the current source or the measurement result is not within thevalid range (too large or too small), then the measurement results are invalid, and "*****" isdisplayed on the screen. Please re-input the signal or set the signal.

10.2.1.1

Time Parameters
Rise Time

Fall Time

Threshold
Upper Limit+Width- WidthThresholdMiddle Value
ThresholdLower Limit

PeriodFigure 10.1 Time Parameters

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Period: defined as the time between the middle threshold points of twoconsecutive, like-polarity edges.

•

Frequency: defined as the reciprocal of period.

•

Rise Time: indicates the time for the signal amplitude to rise from the thresholdlower limit to the threshold upper limit.

•

Fall Time: indicates the time for the signal amplitude to rise from the thresholdupper limit to the threshold lower limit.

•+Width: indicates the time between the threshold middle value of a rising edge
to the threshold middle value of the next falling edge.

•-Width: indicates the time between the threshold middle value of a falling edge
to the threshold middle value of the next rising edge.

•+Duty: indicates the ratio of the positive pulse width to the period.

•-Duty: indicates the ratio of the negative pulse width to the period.

•

Tvmax: indicates the time that corresponds to the maximum value of the
waveform (Vmax).

•

Tvmin: indicates the time that corresponds to the minimum value of the
waveform (Vmin).

The default values for threshold upper limit, threshold middle value, and thresholdlower limit are 90%, 50%, and 10%, respectively.
10.2.1.2

Count Values
The default values for threshold upper limit and threshold lower limit are 90% and10%, respectively.
Positive Pulse Count
It is specified as the number of positive pulses that rise from under the thresholdlower limit to above the threshold upper limit.
Positive Pulse Count = n12n
Threshold
Upper Limit

ThresholdLower Limit

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Negative Pulse Count
It is specified as the number of negative pulses that fall from above the thresholdupper limit to below the threshold lower limit.

Negative Pulse Count = n

Threshold
Upper Limit

ThresholdLower Limit

1

2

n

Rising Edge Count
It is specified as the number of rising edges that rise from under the threshold lower
limit to above the threshold upper limit.
Rising Edge Count = n12n
Threshold
Upper Limit

ThresholdLower Limit

Falling Edge Count
It is specified as the number of falling edges that fall from above the thresholdupper limit to below the threshold lower limit.

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Falling Edge Count = n

Threshold
Upper Limit

ThresholdLower Limit1
10.2.1.3

2nDelay and Phase Parameters

PeriodSource A
Delay
Source B
Figure 10.2 Delay and Phase Parameters
1. Delay(r-r): indicates the time difference between the threshold middle values of
the rising edge of Source A and that of Source B. Negative delay indicates thatthe rising edge of Source A occurred after that of Source B.
2. Delay(f-f): indicates the time difference between the threshold middle values ofthe falling edge of Source A and that of Source B. Negative delay indicates thatthe falling edge of Source A occurred after that of Source B.
3. Delay(r-f): indicates the time difference between the threshold middle values of
the rising edge of Source A and the falling edge of Source B. Negative delay
indicates that the rising edge of Source A occurred after the falling edge ofSource B.
4. Delay(f-r): indicates the time difference between the threshold middle values ofthe falling edge of Source A and the rising edge of Source B. Negative delay
indicates that the falling edge of Source A occurred after the rising edge ofSource B.
5. Phase(r-r): indicates the phase deviation between the threshold middle values of
the rising edge of Source A and that of Source B. The phase formula is as follows:

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PhaseA R B R =DelayA R B R
Period sourceA× 360 °

Wherein, PhaseARBR represents Phase(r-r), DelayARBR represents Delay(r-r), andPeriodsourceA represents the period of Source A.
6. Phase(f-f): indicates the phase deviation between the threshold middle values ofthe falling edge of Source A and that of Source B. The phase formula is as follows:

PhaseA F B F =DelayA F B F
Period sourceA× 360 °

Wherein, PhaseAFBF represents Phase (f-f), DelayAFBF represents Delay(f-f), andPeriodsourceA represents the period of Source A.
7. Phase(r-f): indicates the phase deviation between the threshold middle values of
the rising edge of Source A and the falling edge of Source B. The phase formula isas follows:

PhaseA R B F =DelayA R B F
Period sourceA× 360 °

Wherein, PhaseARBF represents Phase (r-f), DelayARBF represents Delay(r-f), andPeriodsourceA represents the period of Source A.
8. Phase(f-r): indicates the phase deviation between the threshold middle values ofthe falling edge of Source A and the rising edge of Source B. The phase formula isas follows:

PhaseA F B R =DelayA F B R
Period sourceA× 360 °

Wherein, PhaseAFBR represents Phase (f-r), DelayAFBR represents Delay(f-r), andPeriodsourceA represents the period of Source A.
TIP•

Source A and Source B can be any channel among CH1-CH4 and Math1-Math4.

•

The default threshold middle value is 50%.

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10.2.1.4

Voltage Parameters
OvershootVmax
Vupper
Vtop
Vpp

Vmid

Vamp
Vbase

VlowerVmin
Preshoot

Figure 10.3 Voltage Parameters
1. Vmax: indicates the voltage value from the highest point of the waveform to the
GND.
2. Vmin: indicates the voltage value from the lowest point of the waveform to the
GND.
3. Vpp: indicates the voltage value from the highest point to the lowest point of the
waveform.
4. Vtop: indicates the voltage value from the flat top of the waveform to the GND.
5. Vbase: indicates the voltage value from the flat base of the waveform to the GND.
6. Vamp: indicates the voltage value from the top of the waveform to the base of
the waveform.
7. Vupper: indicates the actual voltage value that corresponds to the thresholdmaximum value.
8. Vmid: indicates the actual voltage value that corresponds to the threshold middle
value.
9. Vlower: indicates the actual voltage value that corresponds to the threshold
minimum value.
10. Vavg: indicates the arithmetic average value on the whole waveform or in thegating area. The formula is shown as follows:

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Measurements

Wherein, xi is the ith point, and n is the number of points being measured.
11. VRMS: indicates the root mean square value on the whole waveform or in thegating area. The formula is as follows:

∑

RMS =

n
i =1

xi

2

n

Wherein, xi is the measurement result of the ith point, and n is the number ofpoints being measured.
12. Per.VRMS: indicates the root mean square value within a period. The formula is
as shown above.
13. Overshoot: indicates the ratio of the difference between the maximum value andthe top value of the waveform to the amplitude value.
14. Preshoot: indicates the ratio of the difference between the minimum value andthe base value of the waveform to the amplitude value.
15. AC RMS: indicates the root-mean-square value of the waveforms, with the DC
component removed. The formula is shown as follows:

S td .Dev =

∑

n
i =1

( x i − Average ) 2nWherein, xi is the amplitude of the ith point, Average is the waveform averagevalue, and n is the number of points being measured.
10.2.1.5

Other Parameters•

Positive Slew Rate: On the rising edge, first calculate the difference between
the high value and the low value, then use the difference to divide thecorresponding time value to obtain the positive slew rate.

•

Negative Slew Rate: On the falling edge, first calculate the difference between
the low value and the high value, then use the difference to divide thecorresponding time value to obtain the negative slew rate.

•

Area: indicates the area of the whole waveform within the screen. The unit isV*s. The area of the waveform above the zero reference (namely the verticaloffset) is positive, and the area of the waveform below the zero reference isnegative. The area measured is the algebraic sum of the area of the whole
waveform within the screen.

•

Period Area: indicates the area of the first period of waveform on the screen.
The unit is V*s. The area of the waveform above the zero reference (namely thevertical offset) is positive, and the area of the waveform below the zero

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reference is negative. The area measured is the algebraic sum of the whole
period area.

10.2.2

Select the Measurement Item
In the Measure menu, click or tap Horizontal, Vertical, or Other to go to the desiredmenu. You can also slide to select the measurement item to enter the corresponding
interface, as shown in Figure 10.4 , Figure 10.5 , and Figure 10.6 . Click or tap any ofthe measurement items to enable the measurements. This series allows you to enablemeasurements of up to 14 items at the same time.
TIP
You can also refer to Multi-pane Windowing to enable all measurements.

•

Vertical: Vmax, Vmin, Vpp, Vtop, Vbase, Vamp, Vupper, Vmid, Vlower, Vavg,
VRMS, Per. VRMS, Overshoot, Preshoot, Area, Per.Area, and AC.RMS.

Figure 10.4 Vertical Measurement Items•

Horizontal: Period, Frequency, Rise Time, Fall Time, +Width, -Width, +Duty, Duty, Positive Pulse Count, Negative Pulse Count, Rising Edge Count, Falling
Edge Count, Tvmax, Tvmin, +Slew Rate, and -Slew Rate.

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Figure 10.5 Horizontal Measurement Items•

Other: Delay (r-r), Delay (r-f), Delay (f-r), Delay (f-f), Phase (r-r), Phase (r-f),Phase(f-r), and Phase (f-f).

Figure 10.6 Other Measurement Items
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10.2.3

Measurement Settings
In the Measure menu, click or tap the Setting button to enter the measurement
setting menu.

Figure 10.7 Measurement Settings Menu
Histogram
Click or tap the Histogram on/off switch to enable or disable the histogram function.
After the histogram function is enabled, the Measure Histogram view is displayed on
the screen, as shown in the figure below. The histogram analysis result label isdisplayed in the Result sidebar (refer to Histogram Analysis Results).
NOTE
Add at least one measurement item (Select the Measurement Item) before enabling the
Measure Histogram function.

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After the Measure Histogram function is enabled, please refer to Select the

Measurement Item to add new measurement parameter. The new parameter will be
used as the measurement item. In the "Result" sidebar, you can also click or tap thelabel of the added measurement parameter (e.g. "Vpp" and "Vmin") to change themeasurement item.
Indicator
Click or tap the Indicator on/off switch to enable or disable the indicator.
If enabled, one or more cursors will be displayed on the screen. Before enabling theindicator, you need to enable at least one auto measurement parameter and thenumber of cursors will change with the measurement parameter enabled.
TIP
When no measurement parameter is selected or there is no source input, the indicator is notavailable. The indicator changes when the waveform is expanded or compressed horizontally.

Measurement Threshold•

First, select % or Abs as the display type.

•

Click or tap the drop-down button of Source to select the desired channel. You
can select from CH1-CH4 or Math1-Math4.

•

Click or tap the input field of Upper and use the pop-up numeric keypad to set
the upper limit of the measurement or use the corresponding multipurpose
knob to set the value. When the upper limit is set to be smaller than or equal tothe current middle value, a prompt message "Set at lower limit" is displayed.
Then, the oscilloscope will automatically adjust the upper limit and make itgreater than the middle value. By default, it is 90%. The default absolute value
varies with the vertical setting of the channel.

•

Click or tap the input field of Mid and use the pop-up numeric keypad to set the
middle value of the measurement or use the corresponding multipurpose knob
to set the value. The middle value is limited by the settings of the upper limit
and lower limit. By default, it is 50%. The default absolute value varies with thevertical setting of the channel.

•

Click or tap the input field of Lower and use the pop-up numeric keypad to set
the lower limit of the measurement or use the corresponding multipurpose knob
to set the value. When the lower limit is set to be greater than or equal to thecurrent middle value, a prompt message "Set at upper limit" is displayed. Then,the oscilloscope will automatically adjust the lower limit and make it smaller thanthe middle value. By default, it is 10%. The default absolute value varies with thevertical setting of the channel.

•

Click or tap Default to return the upper, middle, and lower limits to their default
values.

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Click or tap the Threshold on/off switch to enable or disable the threshold settings.
TIP
Modifying the threshold will affect the measurement results of time, delay, and phaseparameters.

Measurement Range
Click or tap the drop-down button of the Region to select "Main" or "Zoom".
•

Main: indicates that the measurement range is within the main time base region.

•

Zoom: indicates that the measurement range is within the zoomed time baseregion.

TIP
To use "Zoom", you need to enable the Zoom Mode (Delayed Sweep) first.

Amplitude Measurement Method
Click or tap Auto or Manual as the amplitude measurement method, which affects
the measurement method for the top and base values

If you select "Manual", set the following parameters:•

Click or tap the Top toggle button to select Histogram or Max-Min as the top
value measurement method.

•

Click or tap the Base toggle button to select Histogram or Max-Min as the basevalue measurement method.

TIP
If you select "Manual" for the amplitude method, the measurement results of other parameters
may be affected.
"Histogram" and "Max-Min" are the internal measurement algorithm for the oscilloscope. The"Histogram" method mentioned above is different from the Histogram function of theoscilloscope.

Remove the Measurement Results
Refer to Remove the Measurement Results.

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Statistics
Click or tap the Statistic on/off switch to enable or disable the statistical result
display. You can also click or tap

at the lower-right of the measurement item inthe "Result" sidebar to expand the label to display all the statistical items. Click or tap
to collapse the label. The figure below shows the displayed results after theStatistic of period measurement is enabled.

•

Click or tap any measurement item in the "Result" sidebar at the right side of thescreen and a window is displayed. Click or tap Reset Stat. to clear the history
statistics data and makes statistics again. You can also click or tap Reset Stat. inthe measurement setting menu.

•

Click or tap the input field of Count and use the pop-up numeric keypad to set
the count value. You can also use the corresponding multipurpose knob to set
the value. Its range is from 2 to 100000. Its default value is 1000.

10.2.4

Remove the Measurement Results
This oscilloscope allows you to delete the measurement results of the parameters.
•

In Measure setting menu, click or tap Remove to delete the currently selected
measurement item that you've added; click or tap Remove All to delete all thedisplayed measurement items.

•

Click or tap any measurement item in the "Result" sidebar at the right side of thescreen and a window is displayed. Click or tap Remove to delete the currently

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selected measurement item that you've added; click or tap Remove All to delete
all the displayed measurement items.
•

In the "Result" sidebar, select a measurement item and drag it to the right todelete it quickly

10.3

Cursor Measurements
Cursor measurement can measure the X axis values (e.g. Time) and Y axis values (e.g.
Voltage) of the selected waveform. Before making cursor measurements, connect thesignal to the oscilloscope to acquire stable display. The cursor measurement function
provides the following two cursors.

Figure 10.8 Cursors•

X Cursor
X cursor is a vertical solid/dotted line that is used to make horizontal
adjustments. It can be used to measure time (s) and frequency (Hz).
-Cursor A is a vertical solid line (is displayed at the bottom of the screen),

and Cursor B is a vertical dotted line (is displayed at the bottom of thescreen).
-In the XY cursor mode, X cursor is used to measure the waveform
amplitude of Source X.

•

Y Cursor
Y cursor is a horizontal solid/dotted line that is used to make verticaladjustments. It can be used to measure amplitude (the unit is the same as that of
the source channel amplitude).

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Cursor A is a horizontal solid line (is displayed at the right section of

the screen), and Cursor B is a horizontal dotted line (is displayed at theright section of the screen).
-

In XY cursor mode, Y cursor is used to measure the waveform amplitude of
Source Y.

You can enable cursor measurements in the following ways.
•

Click or tap the function navigation icon

> Cursors to enable cursor

measurements.
•

Click or tap the Cursors button on the toolbar to enable cursor measurements.

•

Press the front-panel

key to enable cursor measurements.

The measurement results are displayed in the "Result" bar at the right side of thescreen.

•AX: indicates the X value at Cursor A.

•

AY: indicates the Y value at Cursor A.

•

BX: indicates the X value at Cursor B.

•

BY: indicates the Y value at Cursor B.

•∆X: indicates the horizontal spacing between Cursor A and Cursor B.

•∆Y: indicates the vertical spacing between Cursor A and Cursor B.

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1/∆X: indicates the reciprocal of the horizontal spacing between Cursor A andCursor B.

Click or tap the result bar and then select Remove or Setting in the pop-up window.
•

Click or tap Remove. Then the current cursor measurement results will becleared.

•Click or tap Setting. Then the "Cursors" menu is displayed. You can select the
cursor mode: Manual, Track, and XY.

10.3.1

Manual ModeIn the manual cursor mode, you can adjust the cursor manually to measure the valueof the waveforms of the specified source at the current cursor. If the settings for theparameter such as the cursor type and measurement source are different, themeasurement results will be different for cursor measurement.
In the Cursors menu, click or tap Manual for the Mode item to enable the Manual
cursor measurement function. The measurement results are displayed in the "Result"bar at the right side of the screen. When you change the cursor position, themeasurement results will be changed accordingly.

Figure 10.9 Manual Mode Setting Menu
Select the Measurement Source
Click or tap the drop-down button of Source to select the desired channel (None,
CH1-CH4, or Math1-Math4).
When a specified channel is selected as the source, it will be automatically turned on.
Select Cursor TypeClick or tap the Select toggle button to select "X" or "Y".

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X: It is a pair of vertical solid (Cursor A)/dotted (Cursor B) lines, used formeasuring time parameters. The measurement results include AX, BX, ∆X, and 1/∆X.

•

Y: It is a pair of horizontal solid (Cursor A)/dotted (Cursor B) lines, used formeasuring voltage parameters. The measurement results include AY, BY, and ∆Y.

Adjust Cursor Position
1. When "X" is selected, you can adjust the position of X cursor.
- Click or tap the input field of AX and use the pop-up numeric keypad to set thehorizontal position of Cursor A (X cursors). The horizontal axis indicates time,
and the unit of its setting value is the same as that of the horizontal unit. Its
adjustable range is limited within the screen.
- Click or tap the input field of BX and use the pop-up numeric keypad to set thehorizontal position of Cursor B (X cursors). The horizontal axis indicates time,
and the unit of its setting value is the same as that of the horizontal unit. Its
adjustable range is limited within the screen.
- Click or tap the AX BX on/off switch to turn on/off adjusting the horizontal
position of Cursor A and Cursor B (X cursors) simultaneously. The horizontal
spacing between Cursor A and Cursor B (X cursors) remains unchanged.
2. When "Y" is selected, you can adjust the position of Y cursor.
- Click or tap the input field of AY, and then use the pop-up numeric keypad to
set the vertical position of Cursor A (Y cursors). The vertical axis indicatesvoltage, and the unit of its setting value is the same as that of the vertical unit.
- Click or tap the input field of BY and use the pop-up numeric keypad to set thevertical position of Cursor B (Y cursor). The vertical axis indicates voltage, andthe unit of its setting value is the same as that of the vertical unit.
- Click or tap the AY BY on/off switch to turn on/off adjusting the vertical
position of Cursor A and Cursor B (Y cursors) simultaneously. The verticalspacing between Cursor A and Cursor B (Y cursors) remains unchanged.
You can also use the front-panel multipurpose knob

to adjust the cursor

position. To configure the multipurpose knobs, please refer to Front Panel Overview.
Measurement Example
Measure the period of a sine wave by using the manual cursor measurement andauto measurement respectively. The measurement results are both 200 ns.

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Auto Measurement

Cursor Measurement

Figure 10.10 Manual Cursor Measurement Example
Disable the Cursor Measurement Function
When cursor measurement is enabled, you can disable it in the following ways:•

In the Cursors menu, click or tap the Remove button to disable cursor
measurements.

•

In the "Result" bar at the right side of the screen, click or tap the "Cursors" label
and then click or tap Remove in the pop-up window.

•

In the "Result" bar at the right side of the screen, drag the "Cursors" label to theright to simply disable cursor measurements.

•

10.3.2Press the front-panel

key to disable cursor measurements.

Track ModeIn the Track mode, you can adjust the two pairs of cursors (Cursor A and Cursor B) tomeasure the X and Y values on two different sources respectively. When the cursors
are moved horizontally/vertically, the markers will position on the waveform
automatically. When the waveform is expanded or compressed horizontally/vertically,
the markers will track the points being marked at the last adjustment of the cursors.
In the Cursors menu, click or tap Track for the Mode item to enable the Track cursor
measurement function. The measurement results are displayed in the "Result" bar at
the right section of the screen.

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Figure 10.11 Track Mode Setting Menu
Select the Measurement Source•

Click or tap the drop-down button of AX Source to select the desired channel(None, CH1-CH4, or Math1-Math4).

•

Click or tap the drop-down button of BX Source to select the desired channel(None, CH1-CH4, or Math1-Math4).

When a specified channel is selected as the source, it will be automatically turned on.
Select the Track Mode
Click or tap the Track toggle button to select "X" or "Y" as the current track axis. By
default, it is "X".
•

X: When the X cursor position is adjusted, Y cursor will automatically track theintersection point between X cursor and source signal•

Y: When the Y cursor position is adjusted, X cursor will automatically track theintersection point between Y cursor and source signal.

Adjust Cursor Position•

When "X" is selected, you can adjust the position of X cursor.
-

Click or tap the input field of AX and use the pop-up numeric keypad to set
the horizontal position of Cursor A (X cursors). Its adjustable range islimited within the screen.

-

Click or tap the input field of BX and use the pop-up numeric keypad to set
the horizontal position of Cursor B (X cursors). Its adjustable range islimited within the screen.

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Click or tap the AX BX on/off switch to turn on/off adjusting the horizontal
position of Cursor A and Cursor B (X cursors) simultaneously. The horizontal
spacing between Cursor A and Cursor B (X cursors) remains unchanged.

•

When "Y" is selected, you can adjust the position of Y cursor.
-

Click or tap the input field of AY, and then use the pop-up numeric keypad
to set the vertical position of Cursor A (Y cursors).

-

Click or tap the input field of BY and use the pop-up numeric keypad to set
the vertical position of Cursor B (Y cursor).

-

Click or tap the AY BY on/off switch to turn on/off adjusting the vertical
position of Cursor A and Cursor B (Y cursors) simultaneously. The verticalspacing between Cursor A and Cursor B (Y cursors) remains unchanged.

You can also use the front-panel multipurpose knob

to adjust the cursor

position. To configure the multipurpose knobs, please refer to Front Panel Overview.
Measurement Example
Set the AX Source to CH1, BX Source to CH2, and Track to "X".
When the AX cursor position is adjusted, AY cursor will automatically track theintersection point between AX cursor and source signal (CH1); When the BX cursor
position is adjusted, BY cursor will automatically track the intersection point between
BX cursor and source signal (CH2). The measurement results are displayed in the"Result" bar, as shown in Figure 10.12 . Then, expand the waveforms horizontally, andyou will find that the cursor will track the point that has been marked, as shown in

Figure 10.13 .

Figure 10.12 Track Measurement (before Horizontal Expansion)

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Figure 10.13 Track Measurement (after Horizontal Expansion)
Disable the Cursor Measurement Function
When cursor measurement is enabled, you can disable it in the following ways:•

In the Cursors menu, click or tap the Remove button to disable cursor
measurements.

•

In the "Result" bar at the right side of the screen, click or tap the "Cursors" label
and then click or tap Remove in the pop-up window.

•

In the "Result" bar at the right side of the screen, drag the "Cursors" label to theright to simply disable cursor measurements.

•

10.3.3Press the front-panel

key to disable cursor measurements.

XY ModeIn the Cursors menu, click or tap XY for the Mode item to enable the XY cursor
measurement function. The measurement results are displayed in the "Result" bar at
the right section of the screen.

Figure 10.14 XY Mode Setting Menu

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TIP
By default, XY mode is unavailable. It is available only when the horizontal time base mode is"XY". To enable the XY mode, please refer to Enable the XY Mode.

Adjust Cursor Position•

Click or tap to select the "X" tab under the Select menu item to set the X value
for the specified cursor.
-

Click or tap the input field of AX and use the pop-up numeric keypad to set
the X value at Cursor A.

-

Click or tap the input field of BX and use the pop-up numeric keypad to set
the X value at Cursor B.

-

Click or tap the AX BX on/off switch to turn on/off adjusting the X value at
Cursor A and the X value at Cursor B simultaneously.

•

Click or tap to select "Y" under the Select item to set the Y value for the
specified cursor.
-

Click or tap the input field of AY and use the pop-up numeric keypad to set
the Y value at Cursor A.

-

Click or tap the input field of BY and use the pop-up numeric keypad to set
the Y value at Cursor B.

-

Click or tap to the AY BY on/off switch to turn on/off adjusting the Y value
at Cursor A and the Y value at Cursor B simultaneously.

You can also use the front-panel multipurpose knob

to adjust the cursor

position. To configure the multipurpose knobs, please refer to Front Panel Overview.
During the adjustment, the measurement results will change accordingly. The
adjustable range is limited within the screen.
Disable the Cursor Measurement Function
When cursor measurement is enabled, you can disable it in the following ways:•

In the Cursors menu, click or tap the Remove button to disable cursor
measurements.

•

In the "Result" bar at the right side of the screen, click or tap the "Cursors" label
and then click or tap Remove in the pop-up window.

•

In the "Result" bar at the right side of the screen, drag the "Cursors" label to theright to simply disable cursor measurements.

•

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Press the front-panel

key to disable cursor measurements.

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Digital Voltmeter (DVM) and Frequency Counter

11

Digital Voltmeter (DVM) and Frequency
CounterThis series oscilloscope provides a built-in digital voltmeter (DVM) and frequency
counter, which enable you to perform more accurate measurements, improving user
experience in counter and frequency measurement.

11.1

Digital Voltmeter (DVM)
The built-in DVM of this oscilloscope provides 4-digit voltage measurements on any
analog channel. DVM measurements are asynchronous from the oscilloscope's
acquisition system and are always acquiring. You can enable the DVM measurementsin the following ways.
•

Click or tap the function navigation icon

> DVM to enable DVM

measurements.
•

Click or tap the DVM button on the toolbar to enable DVM measurements.

•

Press the front-panel

key and then select DVM in the displayed "Analyse"menu to enable the DVM measurements.
After the DVM measurements are enabled, the "DVM" label appears in the "Result"bar at the right section of the screen, as shown in the figure below.

SourceVoltage ValueMode
DVM Bandwidth
The voltage value in the label shows the measurement extrema over the last 3
seconds.
Click or tap the "DVM" label and then a window is displayed. Click or tap Setting toenter the DVM setting menu as shown in Figure 11.1 . You can click or tap Remove todisable DVM measurements.

11.1.1

Measurement Settings
After the DVM is enabled, click or tap the "DVM" label in the "Result" bar at the rightsection of the screen and a window is displayed. Click or tap Setting in the window toenter the DVM setting menu, as shown in the figure below.

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Figure 11.1 DVM Setting Menu
Select the Measurement Source
Click or tap the Source drop-down button to select the desired source. The analog
channel (CH1-CH4) can be selected to be the measurement source.
Even if the analog channel (CH1-CH4) is not enabled, you can still perform the DVM
measurements.
Select the Measurement ModeIn the Mode item, you can select the DVM mode. The DVM measurement modes
include AC RMS, DC, and AC+DC RMS.
•

AC RMS: displays the root-mean-square value of the acquired data, with the DC
component removed.

•

DC: displays the average value of the acquired data.

•

AC+DC RMS: displays the root-mean-square value of the acquired data.

Set the Limits
Click or tap the Beeper on/off switch to turn on or off the beeper. When the beeper isturned on, you can enable the beeper to sound an alarm when the voltage value isinside or outside the limited range.
•

Limits Condition Setting
Click or tap the When toggle button to select "In Limits" or "Out Limits".
-

In Limits: when the voltage value is inside the limited range, you can enable
or disable the beeper to sound an alarm.

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Out Limits: when the voltage value is outside the limited range, you canenable or disable the beeper to sound an alarm.

•

Upper/Lower Limit Setting
Click or tap the input field of Upper, then use the pop-up numeric keypad to set
the upper limit of the voltage or use the corresponding multipurpose knob to
set the value.
Click or tap the input field of Lower, and then use the pop-up numeric keypad to
set the lower limit of the voltage or use the corresponding multipurpose knob to
set the value.

11.1.2

Remove the Measurement
Click or tap the "DVM" label in the "Result" bar and a window is displayed. Click or
tap Remove to disable DVM measurements and clear the measurement results. You
can also click or tap Remove in the DVM setting menu to disable the function.

11.2

Frequency Counter
The frequency counter analysis function provides frequency, period, or edge event
counter measurements on any analog channel.
You can enable the counter in the following ways:•

Click or tap> Counter to enable the counter.

•

Click or tap the Counter button on the toolbar to enable the counter.

•

Press the front-panel

key and then select Counter in the displayed"Analyse" menu to enable the counter.
After the counter is enabled, the "Counter" label displaying the counter measurement
results appears in the "Result" bar at the right section of the screen, as shown in the
figure below. You can set the Statistic switch to "ON" in "Counter" menu to enable
the statistical results. You can refer to Statistics Results.

SourceValue
Measurement Item
Results

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You can click or tap the "Counter" label in the "Result" bar and select Reset Stat.,
Setting, or Remove in the displayed window.

11.2.1

Measurement Settings
After the frequency counter is enabled, click or tap the "Counter" label in the "Result"bar at the right section of the screen and a window is displayed. Click or tap Settingin the window to enter the counter setting menu, as shown in the figure below.

Figure 11.2 Frequency Counter Setting Menu
Select the Measurement Source
Click or tap the drop-down button of Source to select the desired source. Analog
channels (CH1-CH4) and EXT (for two-channel models only) can be selected as thesource of the frequency counter.
Set Resolution
For Period and Frequency measurements, you need to set the readout resolution.
Click or tap the input field of Resolution to set the resolution by using the pop-up
numeric keypad. You can also use the corresponding multipurpose knob to set thevalue. The range of resolution is from 3 bits to 6 bits. By default, it is 4 bits.
The greater the resolution, the longer the gate time. In this way, the measurement
time will be longer.
Select the Measurement Item
In the Measure item, you can select the desired measurement item. Available options
include Frequency, Period, and Totalize. Wherein, Totalize indicates the count of edge
events on the signal.

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Clear Count
When "Totalize" is selected as the measurement item, the oscilloscope measures thecount of edge events on the signal. At this time, click or tap Clear Count to clear themeasurement results and start the measurements again.
Statistics Results
When "Frequency" or "Period" is selected, click or tap the Statistic on/off switch toturn on/off displaying all statistical items. When enabled, all the statistical results will
be displayed in the "Counter" label in the "Result" bar.

11.2.2

Reset Statistics
Click or tap the "Counter" label in the "Result" bar at the right section of the screen
and a window is displayed. Click or tap Reset Stat. in the window to reset thestatistics.

11.2.3

Remove the Measurement
Click or tap the "Counter" label in the "Result" bar at the right section of the screen
and a window is displayed. Click or tap Remove to clear the measurement results. The"Counter" label disappears from the "Result" bar accordingly. You can also click or tap
Remove in the counter setting menu to disable the function.

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12

Histogram Analysis
The histogram analysis function can provide the statistic view for waveform andmeasurement results, enabling you to judge the trend of waveforms, and quickly
locate the potential problems of the signal. This series oscilloscope supports
histogram types including Horizontal, Vertical, and Measure. For the Measure
Histogram function, refer to Histogram of the "Measurements" chapter. This chapter
only introduces the Horizontal and Vertical histogram.
Click or tap the function navigation icon

and select Histogram to enter theHistogram menu.

Figure 12.1 Histogram Menu

12.1

To Enable or Disable the Histogram Function
In Histogram menu, click or tap the Enable on/off switch to enable or disable thehistogram analysis. After the histogram function is enabled, with the on-goingacquisition and measurement of the waveforms, the height of the bar graph willchange within the set range of the histogram window to indicate the number of times
for data statistics.
Take horizontal histogram as an example. After the histogram function is enabled, thehistogram analysis view as shown in the figure below is displayed on the screen. Also,
the "Histogram" label appears on the Result bar at the right side of the screen.

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Figure 12.2 Histogram Analysis Interface
When the histogram function is enabled, you can click or tap the "Histogram" label >Setting to open the histogram setting menu. You can also click or tap the histogram
plot area to quickly open the histogram setting menu.
TIP
For definitions of the measurement items in the "Histogram" label, refer to Histogram Analysis

Results

12.2

To Select the Histogram TypeIn the Histogram menu, click or tap the Type drop-down button to select thehistogram type.
•

Horizontal: displays the number of times for statistics making in the forms ofcolumns in the histogram bar graph at the bottom of the graticule.

•

Vertical: displays the number of times for statistics making in the forms of rows
in the histogram bar graph at the left of the graticule.

12.3

To Select the Histogram Source
In the Histogram menu, Click or tap the Source drop-down button to select thedesired source. The analog channels (CH1-CH4) can be selected to be the histogramsource.

12.4

To Set the Histogram Height
The histogram height indicates the number of grids the histogram bar graph should
use on the screen.

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In Histogram menu, click or tap the input field of Height, and then use the pop-up
numeric keypad to set the height. It ranges from 1 div to 4 div, and the default is 2
div.

12.5

To Set the Histogram Range
You need to set the histogram window range. Adjust the size and position of thehistogram window by setting the "Left Limit", "Right Limit", "Top Limit", and "Bottom
Limit" respectively.
•

Click or tap the Left Limit input field and use the pop-up numeric keypad to set
the value. You can also use the corresponding multipurpose knob to set thevalue.

•

Click or tap the Right Limit input field and use the pop-up numeric keypad to
set the value. You can also use the corresponding multipurpose knob to set thevalue.

•

Click or tap the Top Limit input field and use the pop-up numeric keypad to set
the value. You can also use the corresponding multipurpose knob to set thevalue.

•

Click or tap the Bottom Limit input field and use the pop-up numeric keypad to
set the value. You can also use the corresponding multipurpose knob to set thevalue.

NOTE
Adjusting the horizontal time base or vertical scale will not affect the histogram limit range,
but only shows variation with the scale.

TIP
You can also drag the histogram window in white to adjust the window's size and position.

12.6

Histogram Analysis Results
After the histogram analysis function is enabled, the "Histogram" label will be
displayed in the Result sidebar, as shown in the figure below. Note that when thehistogram type is set to Histogram, the statistical data results also include theparameter XScale.

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Histogram Analysis

Figure 12.3 Histogram Analysis Results•

Sum: indicates the sum of all bins (buckets) in the histogram.

•

Peaks: indicates the maximum number of hits in any single bin.

•

Max: indicates the maximum value.

•

Min: indicates the minimum value.

•

Pk_Pk: indicates the Delta (Max-Min) between the max. value and the min. value.

•

Mean: indicates the average value of the histogram.

•

Median: indicates the median value of the histogram.

•

Mode: indicates the mode value of the histogram.

•

Bin width: indicates the width of each bin (bucket) in the histogram.

•

Sigma: indicates the standard deviation of the histogram.

•

XScale: indicates the horizontal scale of the histogram. It is 100 times the valueof Bin width.

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Histogram Analysis

12.7

To Remove Results•

Click or tap the "Histogram" label in the Result sidebar and a window isdisplayed. Click or tap Remove in the window to remove measurement results
and disable the histogram function.

•

In the "Result" bar at the right side of the screen, drag the "Histogram" label tothe right to quickly remove results and disable the histogram function.

12.8

To Clear Statistics
Click or tap the "Histogram" label in the Result sidebar and a window is displayed.
Click or tap Clear in the window to clear all statistical data and restart to makestatistics.

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Reference Waveform

13

Reference Waveform
This series oscilloscope provides 10 reference waveform positions (Ref1-Ref10). In theactual test process, you can compare the signal waveform with the reference
waveform to locate the failure.

13.1

To Enable Ref Function
You can access the Ref menu in the following ways.
•

Click or tap the function navigation icon

at the lower-left corner of thescreen, and then select Ref to enter the reference waveform function menu.
•

Press the front-panel

key to enter the reference waveform function menu.

Figure 13.1 Reference Waveform Menu
When the Ref function is enabled, you can select different colors for reference
waveforms, set the source of each reference channel, adjust the vertical scale andoffset of the reference waveform, save the reference waveform to the internal orexternal memory, and recall it when necessary.

13.2

To Set the Reference WaveformIn the Ref menu, you can specify a channel to serve as the reference channel. You cansave or clear the reference channel.
Select the Reference Channel
Click or tap the drop-down button of Current to select the reference waveformchannel (Ref1-Ref10). By default, Ref1 is enabled.

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Reference Waveform

Select the Ref Source
Click or tap the drop-down button of Source to select the desired reference
waveform source (CH1-CH4 or Math1-Math4).
Save the Reference Waveform to Internal Memory
Click or tap SaveToRef to save the displayed waveform for the specified source to theinternal memory as the reference waveform.
CAUTION
This operation only saves the reference waveform to the volatile memory, and the
waveform will be cleared at power-off or restored to the default settings. If you want tostore reference waveforms that can be recalled when necessary, please export the
waveform to internal or external memory (Export to Internal or External Memory)

Clear the Specified Reference Waveform
Click or tap Clear to clear the specified reference waveform for the "current
channel".
You can also click or tap the Clear button in the function navigation menu or press
the front-panel

key to clear the reference waveforms of all the reference

channels.

13.3

To Set the Ref Waveform Display
After clicking or tapping SaveToRef, you can adjust the vertical scale and offset of thereference waveform specified in Current.
Modify the Vertical Scale
Click or tap the input field of VScale, and then use the pop-up numeric keypad to set
the vertical scale of the reference waveform. You can directly click or tap the icons
at the right side of the input field of VScale to increase or decrease the verticalscale value. You can also use the corresponding multipurpose knob to adjust thescale.

Modify the Vertical Offset
Click or tap the input field of VOffset, and then use the pop-up numeric keypad to
set the vertical offset of the reference waveform. You can directly click or tap the Up
and Down arrow icons

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Reference Waveform

increase or decrease the vertical offset value. You can also use the corresponding
multipurpose knob to adjust the offset.

Restore the Reference WaveformIf you have adjusted the vertical scale and offset for the specified reference waveformof the current channel, to reset the reference waveform to the position where thesource channel stays prior to the SaveToRef operation, click or tap Reset.
Set the Reference Waveform ColorThis series oscilloscope provides five colors (gray, green, light blue, red, and orange)
to mark the reference waveforms of different channels in order to distinguish them.
Click or tap the drop-down button of Color to select the color of the reference
waveform of the channel.
Set the Reference Waveform Label
Click or tap the Label on/off switch to enable or disable the label display of thespecified reference waveform.
Click or tap the input field of Label to set the label of the specified reference channel
with the pop-up numeric keypad.

13.4

Export and Import Operation
Export to Internal or External Memory
You can save the current reference waveform to the internal memory or external USB
storage device. The file format of the reference waveform is "*.ref", "*.bin", or "*.csv".
Click or tap Export to enter the reference waveform file saving interface.
•

Set the Format
In the file saving interface, click or tap the drop-down button of Format to select"*.ref", "*.bin", or "*.csv" as the saving format.

•

Set the Filename
Click or tap the input field of File Name to set the filename with the pop-up
virtual keypad.
For how to use the keypad, refer to descriptions in Parameter Setting Method.

•

Set the Save Path
Click or tap the File Path input field, then the disk management menu isdisplayed. Through the disk management menu, you can save the current

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Reference Waveformreference waveform to the internal memory or external USB storage device. Thenclick or tap Save to complete the save operation. For details about the disk
management operation, refer to the Disk Management section in Store and

Load.
TIP
•

Only when the reference waveform is saved, can this export function be valid.

•

For the ".bin" format file, refer to Binary Data Format (.bin).

Import from Internal or External Memory
You can import the stored reference waveform file from the internal memory or
external USB storage device to the instrument and display the file on the screen.
Click or tap Import to enter the reference waveform file loading interface.
•

Set the Format
The file format of the reference waveform is specified as "*.ref" which isdisplayed in Format.

•

Set the Load Path
Click or tap the input field of File Path, then the disk management interface isdisplayed.
Through the disk management menu, you can load the current reference
waveform to the waveform view of the oscilloscope. Then click or tap Load tocomplete the load operation. For details about the disk management operation,refer to the Disk Management section in Store and Load.

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Pass/Fail Test

14

Pass/Fail Test
During the product design and manufacturing process, you usually need to monitor
the variations of the signal or judge whether the product is up to standard. DHO800
series oscilloscope can accomplish this task perfectly with its standard pass/fail test
function. You can use this function to define the mask based on "standard"
waveforms. It compares the signal under test with the mask and displays the test
results. When the pass/fail status is detected, you can choose to stop monitoring,sound an alarm with the beeper, or save the current screen image.
Click or tap the function navigation icon

at the lower-left corner of the screen to

open the function navigation. Then click or tap the Pass/Fail button to enter the"PassFail" setting menu. You can also press the front-panel

key and select Pass/

Fail to enter the "PassFail" setting menu. The menu is as shown in the figure below.

Figure 14.1 PassFail Menu
Click or tap

to minimize the "PassFail" menu to simplify the display, as shown in

the figure below.

Figure 14.2 PassFail Menu-Simplified

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14.1

To Enable or Disable the Pass/Fail Test Function
In the "Pass/Fail" setting menu, click or tap the Enable on/off switch to enable ordisable the pass/fail test function.
You can select the source, create mask, and set test result output only after the pass/
fail test function is enabled.

14.2

To Select the Source
Click or tap the drop-down button of Source to select the desired source. The
available output channels include CH1-CH4.
TIP
When a disabled channel is selected as the source, it will be automatically turned on.

14.3

To Create a Mask
In the Pass/Fail menu, you can self-define the mask of the pass/fail test. The mask can
be imported or exported.
Create a Mask
Click or tap X Mask and Y Mask input fields respectively to set the horizontal
tolerance range and vertical tolerance range with the pop-up numeric keypad. You
can also use the icons at the right side of the input fields or use the corresponding
multipurpose knob to set the values. Then click or tap Create to apply the currently
created mask (the region not covered by blue within the screen).
Save the Mask
When the pass/fail test function is enabled, you can save the current test mask range
to the internal memory or an external USB storage device (when detected) in "*.pf"
format.
Click or tap Save to enter the file saving interface. Click or tap the input field of File
Name and File Path to input the filename and select the desired file path to save thetest mask file to the internal or external memory. For details, refer to the DiskManagement section in Store and Load.
Load a Mask
When the pass/fail test function is enabled, you can load the test mask files from theinternal memory or an external USB storage device (when detected) and apply themto the current pass/fail test function.

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Pass/Fail Test

Click or tap Load to enter the file loading interface. Click or tap the input field of FilePath to load the specified test mask files (in *.pf format) and apply them to thecurrent pass/fail test function. For details, refer to the Disk Management section in

Store and Load.

14.4

To Set the Output Form of the Test Results
In Option, you can set what the oscilloscope will execute when test results aredetected according to your needs.
Set the output event and Aux output•

Click or tap the Aux Output on/off switch to enable or disable the Aux output.
When enabled, in the Utility menu, the sub-menu AUX Out of Setup is
automatically set to "PassFail". When a successful or failed event is detected, apulse will be output from the rear-panel [AUX OUT] connector. When disabled,
the sub-menu AUX Out of Setup in the Utility menu is automatically set to"TrigOut", and the output of the [AUX OUT] connector is irrelevant with the
pass/fail test.

•

Select "Pass" or "Fail" in Output Event. When a "pass" or "fail" event is detected,
a pulse will be output from the rear-panel [AUX OUT] connector.

Set the output polarity and output pulse width
Select "Positive" or "Negative" in Polarity, then click or tap the input field of Pulse to
set the pulse width with the pop-up numeric keypad. You can also use thecorresponding multipurpose knob to set the value. Its range is from 100 ns to 10 ms.
By default, it is 1 μs.
Set the error action
In Err Action, select one operation that the oscilloscope will execute once a pass/failtest is detected.
•

Stop: stop sampling when a failed event is found.

•

Beeper: the beeper sounds an alarm when a failed event is found (irrelevant withthe on/off status of the beeper).

•Screenshot: perform the screenshot operation when a failed event is found. If an
external storage device is detected, the screenshot will be saved to the external
storage device directly. Otherwise, it will be saved to the local disk.
If "Screenshot" is selected, "Stop" action will be executed forcibly. The samplingstops automatically. After the screenshot operation is completed, the sampling
will continue.

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14.5

To Start or Stop the Pass/Fail Test Operation
After the Pass/Fail test function is enabled, click or tap the Operate button
to start the test operation or

to stop the operation.

During the test process, the oscilloscope will test the waveforms, display the test
information, and output the test information based on the current settings. The"Pass/Fail" result will be displayed in the "Result" bar at the right side of the screen,
as shown in the figure below.
Blue Area: Mask

Pass/Fail Result Display

Signal under Test
The test fails once thewaveform reaches themask area.

Figure 14.3 Pass/Fail Test Interface
TIP•

Only when the pass/fail test function is enabled, can you start or stop the pass/fail test
operation, save and load the mask range.

•

After starting the test operation, you can neither modify the source channel nor adjust
the test mask.

14.6

To Display the Statistics of the Test Results
After the "Pass/Fail" function is enabled, the test results will be displayed in the"Result" bar at the right side of the screen. You can click or tap the icon

at thelower-right corner of the screen to hide the "Result" sidebar.
The test results statistics include the number of failed frames, the number ofsuccessful frames, and total number of frames, as shown in the figure below.

Failed Frames
Passed Frames
Total Frames

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Pass/Fail Test

Click or tap the "Pass/Fail" label and a window is displayed for you to perform thefollowing operations.
•

Click or tap Reset Stat., and then the statistics in the "Pass/Fail" label will bereset to 0.

•

Click or tap Setting, and then the PassFail setting menu is displayed.

•

Click or tap Remove, and then the pass/fail function is disabled.

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Protocol Decoding

15

Protocol Decoding
You can use the protocol analysis to discover errors, debug hardware, and accelerate
development easily, ensuring you to accomplish the projects with high speed andgood quality. Protocol decoding is the basis of protocol analysis. Only protocol
analyses with correct protocol decoding are acceptable, and only correct protocol
decoding can identify more error information. This oscilloscope provides four bus
decoding modules (Decode 1, Decode 2, Decode 3, and Decode 4) to make common
protocol decoding for the input signals of the analog channels. It provides standard
serial decodes including Parallel, RS232/UART, I2C, and SPI. As the decoding functions
and setting methods of Decode1, Decode2, Decode3, and Decode4 are the same, thischapter takes Decode1 as an example for illustration.

15.1> Decode to enter the "Decode" menu.

•

Click or tap•

Click or tap the Decode button on the toolbar to enter the "Decode" menu.

Parallel Decoding
Parallel bus consists of clock line and data line. As shown in the figure below, CLK is
the clock line, whereas Bit0 and Bit1 are the 0 bit and 1st bit on the data line
respectively. The oscilloscope will sample the channel data on the rising edge, fallingedge, or the rising/falling edge of the clock and judge each data point (logic "1" orlogic "0") according to the preset threshold level.

CLK

Bit0

Bit1
Parallel[BIN]

11

10

10

10

00

Figure 15.1 Schematic Diagram of Parallel Decoding
In the Decode menu, click or tap the drop-down button of Bus Type to selectParallel, then configure the parameters for Parallel decoding.

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Protocol Decoding

Figure 15.2 Parallel Decoding Menu
Bus Status
Click or tap the Bus Status on/off switch to enable or disable the bus decoding.

15.1.1Clock Setting (CLK)
Clock Setting (CLK)Click or tap the drop-down button of CLK to select from analog channels CH1-CH4. If"OFF" is selected, no clock channel is set, and sampling is performed when a hop
occurs to the data of the data channel during decoding.
Threshold
You need to set a threshold when the clock signal is an analog channel (CH1-CH4).
Click or tap the input field of Threshold, and then use the pop-up numeric keypad to
set the threshold. You can also use the corresponding multipurpose knob to set thevalue. The range of the threshold is related to the current vertical scale and offset.
CLK Edge
You can select "Rising", "Falling", or "Both" in CLK Edge when the clock channel is
set to an analog channel (CH1-CH4).
•

Rising: samples the channel data on the rising edge of the clock.

•

Falling: samples the channel data on the falling edge of the clock.

•

Both: samples the channel data on the rising edge or the falling edge of theclock.

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Protocol Decoding

15.1.2Bus Setting
Set the Bus
Click or tap the drop-down button of BUS to select the desired bus. Available options
include analog channels CH1-CH4. You can also self-define the bus.
Table 15.1 Bus Setting
Bus

Width

Bit X

ChannelRemarks
Width, Bit X, and CH are set

CH1

1

0

CH1

automatically, and you
cannot modify them.
Width, Bit X, and CH are set

CH2

1

0

CH2

automatically, and you
cannot modify them.
Width, Bit X, and CH are set

CH3

1

0

CH3

automatically, and you
cannot modify them.
Width, Bit X, and CH are set

CH4

1

0

CH4

automatically, and you
cannot modify them.

User

1 (Default)
to 40 (Default)--

Set the Width
When the "BUS" setting is set to "User", you can set the bus width. Click or tap the
input field of Width, and then use the pop-up numeric keypad to set the width. You
can also use the corresponding multipurpose knob to set the value.
Specify data channel for each bit
When the "BUS" setting is set to "User", you can specify the data channel for each bit.
Click or tap Bit X set the bit of the channel. By default, 0 is selected. Its available
range is from 0 to (width - 1).
Click or tap the drop-down button of CH to select the data channels for a bit.
Available sources include analog channels CH1-CH4.

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Protocol Decoding

Set the Threshold Level
To judge logic "1" and logic "0" of the buses, you need to set a threshold for eachanalog channel (CH1-CH4). When the channel signal amplitude is greater than thepreset threshold, it is judged as logic "1"; otherwise logic "0".
Click or tap the input field of Threshold, and then use the pop-up numeric keypad to
set the threshold. You can also use the corresponding multipurpose knob to set thevalue. The range of the threshold is related to the current vertical scale and offset.

Set the endian
In Endian, select "Invert" or "Normal" as the endian of the bus.
Set the polarity
In Polarity, select "Positive" or "Negative" as the data polarity.

15.1.3

Display-related Settings
In Decode menu, set the following display-related parameters.
Set the Display Format
Click or tap the drop-down button of Format to select the display format of the bus
data and event table. The available options include "Hex", "Dec", "Bin", and "ASCII".
Set the Label Display
Click or tap the Label on/off switch to enable or disable the label display of thedecoding bus. When enabled, the bus label will be displayed at the upper-left side of
the bus (when the bus display is enabled). The label shows the current bus type.

15.1.4

Event TableThe event table displays the decoded data and the corresponding decoding
information in time order in the form of a table. It can be used to observe relatively
longer decoded data. The decoding information includes the decoded data, thecorresponding line number, and time information.

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Protocol Decoding

Open or Close the Event Table
Click or tap the Event Table on/off switch to enable or disable the display of theevent table. When enabled, the event table is displayed as shown in the figure below.
You can also click or tap the icon

at the upper-right corner of the table to closethe event table.

Parallel Bus

Line No.

Decode Time

Decoded Data

Figure 15.3 Parallel Decoding Event Table
TIP•

When you adjust the horizontal time base, the waveform displayed on the screen will alsochange, and the total number of lines containing the decoding information in the event
table will also be changed.

•

The displayed decoded data information in the bus is related to the value of thehorizontal time base. Reducing the horizontal time base can help you view the detailed
information.

ExportWhen the oscilloscope is in "STOP" state, you can export the time and its
corresponding decoded data in the event table.
In Decode menu, click or tap Export, then the save setting interface is displayed. You
can export the data to the internal memory or the external USB storage device (onlywhen detected) in *.csv format. For details, refer to Store and Load.

15.2

RS232 Decoding
RS232 serial bus consists of the transmitting data line (TX) and the receiving data line(RX).

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Protocol Decoding

Figure 15.4 Schematic Diagram of RS232 Serial Bus
In RS232, baud rate is used to represent the transmission rate (namely bits per
second) of the data. You need to set the start bit, data bits, check bit (optional), andstop bits for each frame of data.

•

Start Bit: indicates when to output data.

•

Data Bit: indicates the number of data bits actually contained in each frame of
data.

•

Check Bit: used to check whether the data are properly transmitted.

•

Stop Bit: indicates when to stop outputting data.

In the Decode menu, click or tap the drop-down button of Bus Type to select RS232,
then configure the parameters for RS232 decoding.

Figure 15.5 RS232 Decoding Menu

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Bus Status
Click or tap the Bus Status on/off switch to enable or disable the bus decoding.
Quickly Apply Trigger Settings to Decoding
Copy trig indicates applying the trigger settings to the specified decoding setting.
Click or tap Copy Trig to apply the trigger settings to the specified decoding setting.

15.2.1

Source Setting
Set the Tx source and the threshold
Click or tap drop-down button of Tx to select the desired source. The options include
CH1-CH4 and OFF.
When the source is set to CH1-CH4, you can click or tap the input field of Threshold,and then use the pop-up numeric keypad to set the threshold of Tx source. You canalso use the corresponding multipurpose knob to set the value. The range of thethreshold is related to the current vertical scale and offset.
When you modify the threshold of the Tx source channel, a dotted line displaying thecurrent threshold level is displayed on the screen. It disappears in about 2 s after you
stop modifying the threshold.
Set the Rx source and the threshold
Use the same method to select the Rx source and set the threshold. The default stateof Rx is OFF.
TIP
The sources of Tx and Rx cannot be set to OFF at the same time.

Polarity
Click or tap "Positive" or "Negative" in Polarity.
•

Positive: High level is logic "1" and low level is logic "0".

•Negative: High level is logic "0" and low level is logic "1".

Set the baud rate
Click or tap the drop-down button of Baud to select the baud rate. The available
baud rates include 50 bps, 75 bps, 110 bps, 134 bps, 150 bps, and etc.
The oscilloscope allows you to self-define the baud rate. Click or tap the drop-down
button of Baud to select "User" and then set the baud rate with the pop-up numeric
keypad.

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15.2.2

To Set Data Package
Data
Click or tap the drop-down button of Data to select the data bits. The available databits are 5 bits, 6 bits, 7 bits, 8 bits, and 9 bits.
ParityIt is used to check whether the data transmission is correct. Click or tap the dropdown button of Parity to select the desired parity mode.
•

None: indicates that no check bit appears during the transmission.

•

Even: indicates that the total number of "1" in the data bit and check bit is aneven number. For example, when 0x55 (01010101) is sent, "0" should be added
to the check bit.

•

Odd: indicates that the total number of "1" in the data bit and check bit is an
odd number. For example, when 0x55 (01010101) is sent, "1" should be added tothe check bit.

Stop Bit
Click or tap the drop-down button of Stop Bit to set the stop bits after each frame ofdata. It can be set to 1 bit, 1.5 bits, or 2 bits.
EndianClick or tap the drop-down button of Endian to select the desired endian.
•

LSB: indicates Least Significant Bit transmission sequence, i.e. the lowest bit ofthe data is transmitted first.

•

MSB: indicates Most Significant Bit transmission sequence, i.e. the highest bit ofthe data is transmitted first.

MSB

bit0

LSB

bit1

t

bit2

bit3

bit4

bit5

bit6

bit7

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

15.2.3t

Display-related Settings
In Decode menu, set the following display-related parameters.

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Protocol Decoding

Set the Display Format
Click or tap the drop-down button of Format to select the display format of the bus
data and event table. The available options include "Hex", "Dec", "Bin", and "ASCII".
Set the Label Display
Click or tap the Label on/off switch to enable or disable the label display of thedecoding bus. When enabled, the bus label will be displayed at the upper-left side of
the bus (when the bus display is enabled). The label shows the current bus type.

15.2.4

Event Table
Click or tap the Event Table on/off switch to enable or disable the display of theevent table. When enabled, the event table is displayed as shown in the figure below.
You can also click or tap the icon

at the upper-right corner of the table to closethe event table.

RS232 BusLine No.

Time

Tx/Rx

Data

Error

Figure 15.6 RS232 Decoding Event Table
TIP•

When you adjust the horizontal time base, the waveform displayed on the screen will alsochange, and the total number of lines containing the decoding information in the event
table will also be changed.

•

The displayed decoded data information in the bus is related to the value of thehorizontal time base. Reducing the horizontal time base can help you view the detailed
information.

ExportWhen the oscilloscope is in "STOP" state, you can export the time and its
corresponding decoded data in the event table.

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Protocol Decoding

In Decode menu, click or tap Export, then the save setting interface is displayed. You
can export the data to the internal memory or the external USB storage device (onlywhen detected) in *.csv format. For details, refer to Store and Load.

15.3

I2C Decoding
I2C serial bus consists of the clock line (SCL) and the data line (SDA).
SCL: samples SDA on the rising or falling edge of the clock.
SDA: indicates the data channel.
SCL
SDA

Figure 15.7 I2C Serial Bus
In the Decode menu, click or tap the drop-down button of Bus Type to select I2C,
then configure the parameters for I2C decoding.

Figure 15.8 I2C Decoding Menu
Bus Status
Click or tap the Bus Status on/off switch to enable or disable the bus decoding.
Quickly Apply Trigger Settings to Decoding
Copy trig indicates applying the trigger settings to the specified decoding setting.
Click or tap Copy Trig to apply the trigger settings to the specified decoding setting.

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Protocol Decoding

15.3.1

Source Setting
Set the clock channel source and the threshold•

Click or tap the drop-down button of CLK to select the desired source of theclock channel. Available sources include analog channels CH1-CH4.

•

Click or tap the input field of SCL Thre and use the pop-up numeric keypad to
set the threshold of the clock channel. You can also use the corresponding
multipurpose knob to set the value.
When you modify the threshold of the clock channel, a dotted line displaying thecurrent threshold level is displayed on the screen. It disappears in about 2 s after
you stop modifying the threshold.

Set the data channel source and the threshold•

Click or tap the drop-down button of SDA to select the desired source of thedata channel. Available sources include analog channels CH1-CH4.

•

Click or tap the input field of SDA Thre and use the pop-up numeric keypad to
set the threshold of the data channel. You can also use the corresponding
multipurpose knob to set the value.

Exchange sources
Select "SCL/SDA" or "SDA/SCL" in Exchange to exchange the sources of the current
clock channel and data channel.
Specify whether the address information includes the "R/W" bit
For I2C bus, each frame of data starts with the address information (read address andwrite address).
Select "Without" or "With" in R/W to decide whether the address information
includes the "R/W" bit. When "With" is selected, the "R/W" bit will be included in theaddress information; when "Without" is selected, the "R/W" bit will not be includedin the address information.

15.3.2

Display-related Settings
In Decode menu, set the following display-related parameters.
Set the Display Format
Click or tap the drop-down button of Format to select the display format of the bus
data and event table. The available options include "Hex", "Dec", "Bin", and "ASCII".

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Protocol Decoding

Set the Label Display
Click or tap the Label on/off switch to enable or disable the label display of thedecoding bus. When enabled, the bus label will be displayed at the upper-left side of
the bus (when the bus display is enabled). The label shows the current bus type.

15.3.3

Event Table
Open or Close the Event Table
Click or tap the Event Table on/off switch to enable or disable the display of theevent table. When enabled, the event table is displayed as shown in the figure below.
You can also click or tap the icon

at the upper-right corner of the table to closethe event table.

I2C BusLine No.

Time

R/W Bit

Address

Decoded Data

ACK

Figure 15.9 I2C Decoding Event Table
TIP•

When you adjust the horizontal time base, the waveform displayed on the screen will alsochange, and the total number of lines containing the decoding information in the event
table will also be changed.

•

The displayed decoded data information in the bus is related to the value of thehorizontal time base. Reducing the horizontal time base can help you view the detailed
information.

ExportWhen the oscilloscope is in "STOP" state, you can export the time and its
corresponding decoded data in the event table.
In Decode menu, click or tap Export, then the save setting interface is displayed. You
can export the data to the internal memory or the external USB storage device (onlywhen detected) in *.csv format. For details, refer to Store and Load.

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Protocol Decoding

Address information in decoding
For I2C bus, each frame of data starts with the address information (read address andwrite address). In the address information, "Read" indicates the read address() and "Write" indicates the write address (). You can decide

whether to include or exclude the "R/W" bit for the address information.
Error expressions in decoding
In I2C decoding, the response includes ACK (acknowledgment) and NACK (nonacknowledgment). When NACK is detected after "Write", red error report information(

15.4) is displayed.

SPI Decoding
SPI bus is based on the master — slave configuration and usually consists of chip
select line (CS), clock line (CLK), and data line (SDA). Wherein, the data lines include
the master input/slave output (MISO) data line and master output/slave input (MOSI)
data line. The oscilloscope samples the channel data on the rising or falling edge ofthe clock signal and judge each data point (logic "1" or logic "0") according to thepreset threshold level.
CLK
MOSI
Master

MISO

Slave

CLK

CS
SDA

(MISO/MOSI)

Figure 15.10 SPI Serial Bus
In the Decode menu, click or tap the drop-down button of Bus Type to select SPI,
then configure the parameters for SPI decoding.

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Protocol Decoding

Figure 15.11 SPI Decoding Menu
Bus Status
Click or tap the Bus Status on/off switch to enable or disable the bus decoding.
Quickly Apply Trigger Settings to Decoding
Copy trig indicates applying the trigger settings to the specified decoding setting.
Click or tap Copy Trig to apply the trigger settings to the specified decoding setting.

15.4.1

To Set the Source
Set the Clock Signal•

Click or tap the drop-down button of CLK to select the desired source of theclock channel. Available sources include analog channels CH1-CH4.

•

Click or tap the input field of Threshold at the right side of CLK and use the
pop-up numeric keypad to set the threshold of the clock channel. You can also
use the corresponding multipurpose knob to set the value.

•

Click or tap "Rising" or "Falling" in Slope to set the instrument to sample MISO
and MOSI on the CLK edge.

MISO and MOSI Setting•

Click or tap the drop-down button of MISO to select the desired source.
Available sources include analog channels CH1-CH4 and OFF.

•

When the MISO source is set to CH1-CH4, you can click or tap the input field ofThreshold at the right side of MISO, and then use the pop-up numeric keypad
to set the threshold of the MISO channel. You can also use the corresponding
multipurpose knob to set the value.

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Protocol Decoding•

Click or tap the drop-down button of MOSI to select the desired source.
Available sources include analog channels CH1-CH4 and OFF.

•

When the MOSI source is set to CH1-CH4, you can click or tap the input field ofThreshold at the right side of MOSI, and then use the pop-up numeric keypad
to set the threshold of the MOSI channel. You can also use the corresponding
multipurpose knob to set the value.

TIP
The MISO and MOSI sources cannot be set to "OFF" at the same time.

15.4.2

To Set Mode and Data
Mode
Select "Timeout" or "CS" in Mode.
•

Timeout
You can perform frame synchronization according to the timeout, and thetimeout value must be greater than half of the clock cycle Click or tap the input
field of Timeout, and then use the pop-up numeric keypad to set the timeout
value. You can also use the corresponding multipurpose knob to set the value.
The adjustable range of the timeout value is from 8 ns to 10 s. By default, it is 1
μs.

•

CS
It contains a chip select line (CS). You can perform frame synchronizationaccording to CS. When "CS" is selected,-

Click or tap the drop-down button of CS to select the desired source. The
sources include analog channels CH1-CH4.

-

Click or tap the input field of Threshold and use the pop-up numeric
keypad to set the threshold. You can also use the corresponding
multipurpose knob to set the value.

-

In CS Polarity, select "Positive" or "Negative".

NOTE
As DHO812/DHO802 only has two channels, the CS mode is not available.

EndianClick or tap the drop-down button of Endian to select the desired endian.

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Protocol Decoding•

LSB: indicates Least Significant Bit transmission sequence, i.e. the lowest bit ofthe data is transmitted first.

•

MSB: indicates Most Significant Bit transmission sequence, i.e. the highest bit ofthe data is transmitted first.

MSB

bit0

LSB

bit1

t

bit2

bit3

bit4

bit5

bit6

bit7

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

t

Polarity
In Polarity, select "Positive" or "Negative" as the data polarity.
Width Setting
Click or tap the input field of Width, and then use the pop-up numeric keypad to set
the length of the data. You can also use the corresponding multipurpose knob to set
the value. The setting range is from 4 to 32. By default, it is 8.

15.4.3

Display-related Settings
In Decode menu, set the following display-related parameters.
Set the Display Format
Click or tap the drop-down button of Format to select the display format of the bus
data and event table. The available options include "Hex", "Dec", "Bin", and "ASCII".
Set the Label Display
Click or tap the Label on/off switch to enable or disable the label display of thedecoding bus. When enabled, the bus label will be displayed at the upper-left side of
the bus (when the bus display is enabled). The label shows the current bus type.

15.4.4

Event Table
Open or Close the Event Table
Click or tap the Event Table on/off switch to enable or disable the display of theevent table. When enabled, the event table is displayed as shown in the figure below.
You can also click or tap the icon

at the upper-right corner of the table to closethe event table.

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Protocol Decoding

SPI BusLine No.

Time

MISO Decoded DataMISO Error

Figure 15.12 SPI Decoding Event Table
TIP•

When you adjust the horizontal time base, the waveform displayed on the screen will alsochange, and the total number of lines containing the decoding information in the event
table will also be changed.

•

The displayed decoded data information in the bus is related to the value of thehorizontal time base. Reducing the horizontal time base can help you view the detailed
information.

ExportWhen the oscilloscope is in "STOP" state, you can export the time and its
corresponding decoded data in the event table.
In Decode menu, click or tap Export, then the save setting interface is displayed. You
can export the data to the internal memory or the external USB storage device (onlywhen detected) in *.csv format. For details, refer to Store and Load.

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Multi-pane Windowing

16

Multi-pane Windowing
This series oscilloscope supports multi-pane windowing. You can add multiple
windows and result display windows for display and view.
Click or tap> Windows to enter the "Add Window" menu. You can also click or

tap the Windows button on the toolbar at the top of the screen to enter the menu, asshown in the figure below.

Figure 16.1 "Add Window" Menu
Add Diagram Windows
1. First, select "XY" or "Math" in Diagram. When a diagram is selected, its preview
and parameter setting items can be displayed at the upper part of the "AddWindow" menu.
2. You can set the corresponding parameters according to your needs. For details,
refer to descriptions of relevant chapters.
3. Click or tap Add and then the selected diagram is displayed on the screen.

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Multi-pane Windowing

TIP
When the waveform view window is closed, the "Waveform View" item appears on the
Diagram menu. You can use the item to open the waveform view window.

Add Result Table Window
Click or tap "Measure", "All Measure", or "Decode" in Result Table, and then clickor tap Add. The corresponding measurement results will be displayed on the screen.

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Waveform Recording and Playing

17

Waveform Recording and Playing
Waveform recording/playing function can play the recorded waveforms, enabling you
to analyze the waveforms better.
You can enter the "Record" menu in the following ways.
•

Click or tap the function navigation icon

and then select Record to enter the"Record" menu.
••

Click or tap Record on the toolbar to enter the "Record" menu.
Press the front-panel

key and select Record in the pop-up "Analyse"menu to enter the "Record" menu.

Figure 17.1 "Record" Menu
TIP
When the acquisition mode is set to UltraAcquire, the waveform recording/playing function is
not available. You can view waveform segments using Navigate segments.

17.1

Common Settings
Waveform Recording
Click or tap the Record on/off switch to enable or disable the waveform recording
function. Before recording the waveform, you can refer to descriptions in Record

Options to set the waveform recording parameters.

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Waveform Recording and Playing••

Click or tap the Record button

to start recording the waveforms. Then therecord icon turns into

.

from

The data at the right side of the record progress bar indicate the current frame/
total frames. During recording, the current recording information is displayed on
the screen in real time with the current frames constantly changing.

•

After the recording is completed,turns intoand recording stops

automatically.
•

During recording, you can also click or tap

to suspend the recording

manually.

Currently Recorded Frames

Total Frames

Waveform Playing
Click or tap the play icon
the play icon turns into

in Play to start playing the recorded waveforms. Thenfrom

. For details about playing, refer to descriptions inPlay Options. During waveform playing, the value in Current changes dynamically.
During playing, you can also click or tap the icon

again to suspend playing

manually. ∆T indicates the time interval between the current frame and the first frame
during the recording process.

17.2

Record Options
During the waveform recording, the oscilloscope records the waveforms of thecurrently enabled channel at a specified interval until you manually stops therecording operation or the number of recorded frames has reached the limit
Before recording the waveforms, set the following parameters.
1. Interval
The recording interval indicates the time interval between the frames during therecording process.
Click or tap the Interval input field and use the pop-up numeric keypad to set thetime interval between frames. You can also use the front-panel multipurpose knob
to set the value. The available range is from 10 ns to 1 s.
2. Frames
The recording frames refer to the number of frames that can be recorded actually.
After starting the recording operation, the oscilloscope stops the recording

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Waveform Recording and Playing

operation automatically when the number of recorded frames reaches the set
value.
Click or tap the Frames input field to set the number of waveform frames to berecorded currently. You can also use the front-panel multipurpose knob to set thevalue. The range available is from 1 to the maximum number of frames that can berecorded currently.
3. Max Frames
The input field of Max Frames displays the maximum number of frames that canbe recorded currently. Click or tap Max and the frames will be automatically set tothe maximum value.
As the waveform memory is fixed, the more points in each frame, the fewer
waveform frames that can be recorded. Therefore, the maximum number ofrecorded frames depends on currently selected "memory depth" (refer to Memory

Depth). The number of waveform points per frame is the current memory depth.
Memory Depth ≥ Sample Rate x Horizontal Time Base x Number of Grids in the
Horizontal Direction. Therefore, the Max. value of waveform recording is also
related to the "Sample Rate" and "Horizontal Time Base".
4. Beeper: the beeper sounds at the end of recording.
: the beeper does not sound at the end of recording.

17.3

Play Options
Waveform playing function can play back the waveforms currently recorded. In Play,click or tap the Minimize on/off switch to select whether to minimize the menu.
When ON is selected, the window is minimized, making the display more simplified,easy for observation and operation. The minimized menu is as shown in the figure
below.

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Waveform Recording and Playing

Time Interval

Play Mode

Back to Start Previous Frame
Frame

Play Button

Next Frame

Back to End
Frame

Play Sequence

End Frame

Start Frame

Figure 17.2 Minimized "Play" Menu
Before playing the waveforms, set the following parameters.
1. Play Mode
You can play the waveforms in single mode () or cycle mode ().

-: plays from the start frame to the end frame, and then stops automatically.

-: plays from the start frame to the end frame, then such playback operationis repeated until you stop it manually.

2. Play Sequence
You can play back the waveforms clockwise () or counterclockwise (-: plays from the start frame to the end frame.

-: plays from the end frame to the start frame.

).

3. Interval
The playback interval indicates the time interval between the frames during theplaying process.
Click or tap the input field of Interval, and then use the pop-up numeric keypad to
set the time interval between frames. You can also use the corresponding
multipurpose knob to set the value. The available range is from 1 ms to 1 s.
4. Start Frame

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Waveform Recording and Playing

Click or tap the "Start Frame" input field in Figure 17.2 to set the start frame forplaying back the waveforms. You can also use the corresponding multipurpose
knob to set the value. The default is 1, and the maximum value is the maximum
number of frames recorded.
5. End Frame
Click or tap the "End Frame" input field in Figure 17.2 to set the end frame forplaying back the waveforms. You can also use the corresponding multipurpose
knob to set the value. The default is the number of frames of the recorded
waveforms.
6. Current Frame
When the playing is stopped, click or tap the "Current" input field in Figure 17.2 to
set the currently displayed frame with the pop-up numeric keypad. You can also
use the corresponding numeric keypad to set the value. The maximum allowed isthe number of recorded frames.

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Search and Navigation18

Search and Navigation
The Search function allows you to quickly find and mark the event of interest andthen go to the specified event in the marktable by navigating search events. The
search types include edge and pulse.
The Navigation function allows you to navigate time, search events, and segments.

18.1

SearchThis function allows you to search for the specified edge and pulse width trigger
vents. Found search events are marked with small inverted triangles (of the graticule. Click or tap) at the top> Search to enter the "Search" menu. You can also

click or tap Search in the "Navigation" menu (only when the navigation mode is set to"Search Event") to enter the "Search" menu, as shown in the figure below.

Figure 18.1 Search Menu
1. Search On/Off
Click or tap Search on/off switch to enable or disable the search function.
TIP
Enabling the search function automatically turns on the Zoom Mode (Delayed Sweep).

2. Set up searches
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Search and Navigation

Click or tap the Type drop-down button to select "Edge" or "Pulse". Click or tap
the Source drop-down button to select the source.
- Edge Searches: After setting the search type to "Edge", you can select the slope
type. For details, please refer to Edge Trigger. You can click or tap theThreshold input filed to set the threshold with the pop-up numeric keypad or
use the corresponding multipurpose knob to set the value.
- Pulse Width Searches: After setting the search type to "Pulse", you can set thetrigger condition. For details, please refer to Pulse Width Trigger. You can clickor tap the Threshold input filed to set the threshold with the pop-up numeric
keypad or use the corresponding multipurpose knob to set the value.
3. Copy search setups- Copy to Trigger
Click or tap To Trigger to copy the setup for the selected search type to thesame trigger type. For example, if the current search type is "Edge", clicking or
tapping To Trigger copies the search settings to the "Edge Trigger" settings.
- Copy from Trigger
Click or tap From Trigger to copy the trigger setup for the selected search typeto the search setup. For example, if the current trigger type is "Edge Trigger",clicking or tapping From Trigger copies the trigger settings to the "Edge"
search setup.
NOTE
To use the "To Trigger" or "From Trigger" function, the current trigger type should
correspond to the search type. Otherwise, a prompt message "Type mismatch" will pop up.

4. Marktable On/Off
Click or tap the MarkTable on/off switch to turn on or off the marktable display, as
shown in the figure below. The table lists all events of the current waveform in the
Waveform View. Zooming or adjusting the waveform causes the events in the table
to change. You can perform the following operations on the table:- When acquisitions are stopped (STOP mode), click or tap any row of the table toselect the specified event. The inverted triangle mark of the selected event turns
red like- Click or tap.
at the upper-right side of the table to open the search menu.

- Select the gray title bar of the table to drag the table and move the tablewindow.
- Click or tap

at the upper-right side of the table to close the search menu.

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Search and Navigation

Figure 18.2 MarkTable Display
5. Navigation
Click or tap Navigation to access the navigation menu. You can use the "Search
Event" mode in Navigation to navigate through the search events.
6. Save search events
You can save the event data to the instrument’s internal memory or an external
USB storage device in format of "*.csv".
Click or tap Save events to access the "Save" menu. For details, please refer to To

Save a File.

18.2

Navigation
The Navigation function allows you to navigate time, search events, and segments.
You can assess the Navigation menu in the following ways.

•

Press the front-panel•

Click or tap Navigate on the toolbar at the upper-right of the interface.

•In the "Search" menu, click or tap Navigation to access the menu.

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key to access the menu.

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Search and Navigation

Figure 18.3 Navigation Menu
The normal Navigation menu is as shown in the figure above. You can click or tap
to minimize the menu (see the figure below) for a simplified interface.

Figure 18.4 Simplified Navigation Menu
TIP
The navigation function is available only when the oscilloscope is in “STOP” state (acquisition
stopped).

Navigate time
It is available only when in "YT" time mode. The menu is as shown in Figure 18.3 .
When "Time" is selected, click or tap
panel

in "Navigation" menu or press the front-

key to start/stop playout. During playout, you can click or tap

backward or

to play

to play forward. The playout automatically stops when it reaches theleft or right edges. When it stops, clicking or tapping/

moves the waveform.

Click or tap the Speed drop-down button to select the speed level.
Navigate search events
After searching events using the Search function, you can select the "Search Event"mode in Navigation menu to navigate to specific events in the marktable. Its setting
menu is as shown in Figure 18.5 .

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Search and Navigation

Figure 18.5 "Search Event" Navigation Setting Menu
After "Search Event" is selected, click or tap Search to open the "Search" menu andset the search condition. For search setup, please refer to Search. You can select the
search type from the Type item. Click or tap
to go to the next search event. Click or tap

to go to the previous search event or
to go to the first event orto

go to the last event.
Navigate segments
This mode is available only in UltraAcquire acquisition mode. When UltraAcquire isenabled, the Mode is automatically set to "Frame Segment" which cannot be
modified. Its setting menu is as shown in Figure 18.6 .

Figure 18.6 "Frame Segment" Navigation Setting Menu•

In this mode, you can click or tap the Display mode drop-down button to set
the display mode of segments. For details, please refer to UltraAcquire.

•

Click or tap Start Frame and End Frame input fields to set the start frame andend frame which define the segment range to navigate through. You can also
use the corresponding multipurpose knob to set the start/end frame. After you

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Search and Navigation

click or tap the play/stop key, it plays from the "Start Frame" and the number offrames that can display on each screen page is (End Frame-Start Frame+1).
For example, if you set the start frame to 3 and the end frame to 9, it will playfrom the 3rd frame and displays 7 frames at a page.
•

Click or tap

in "Navigation" menu or press the front-panel

key to start/

stop playing through the frames between the Start Frame and End Frame.
During playout, you can click or tap

to play backward or

to play forward.

The playout automatically stops when it reaches the left or right edges. When it
stops, you can click or tap
or tap/to go forward or backward. You can also click

to go to the first page orto go to the last page. The current

page/total pages is indicated in Current Page.
TIP
During segment playing, you are not allowed to change the start/end frame.

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Display Control

19

Display Control
In the Display setting menu, you can set the type, persistence time, waveform
intensity, grid type, grid brightness, and etc. Click or tap the function navigation icon
at the lower-left corner of the screen, and then select Display to enter the"Display" menu. You can also click or tap theicon at the upper-right of the

Waveform View to enter the "Display" menu.

Figure 19.1 Display Setting Menu

19.1

Display Type
This series oscilloscope provides the "Vector" display mode in which the sample
points are connected by lines and displayed. In most cases, this mode can provide themost vivid waveform for you to view the steep edge of the waveform (such as square
waveform).

19.2

Persistence TimeIn the Display setting menu, click or tap the drop-down button of Persistence Timeto select the persistence time. The available values are Min, specific values (100 ms,
200 ms, 500 ms, 1 s, 2 s, 5 s, 10 s), and Infinite.

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Display Control

In the following part, a frequency sweep signal of the sine waveform is used to show
the waveform effects in different persistence times.
•

Min
Enables you to view waveform changing in high refresh rate.

•

Specific Values
Enables you to view glitches that change relatively slowly or glitches with lower
occurrence probability. The persistence time can be set to 100 ms, 200 ms, 500
ms, 1 s, 2 s, 5 s, or 10 s.

•

InfiniteIn this mode, the oscilloscope displays the waveform newly acquired without
clearing the waveforms acquired formerly. The waveforms acquired formerly will
be displayed in relatively low-brightness color and the newly acquired
waveforms will be displayed in normal brightness and color. Infinite persistence
can be used to measure noise and jitter and to capture incidental events.

19.3

Waveform Intensity
In Display menu, drag the slide bar of Wave Intensity to set the brightness ofwaveforms. The default is 50%, and the range available is from 1% to 100%.

19.4

To Set the Screen Grid
In the Display menu, select "FULL", "HALF", or "NONE" in Grid.

19.5

•

FULL: turns the background grid on.

•

HALF: turns part of the grid off, leaving only the main grid.

•

NONE: turns the background grid off.

Display Settings
Grid Brightness
In the Display setting menu, drag the slider of Grid Brightness to set the gridbrightness. The default is 50%, and the range available is from 0% to 100%.

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Display Control

Window Transparency
In the Display setting menu, drag the slider of Window Transparency to set thewindow transparency. The default is 50%, and the range available is from 0% to 100%.
Cursor Brightness
In the Display setting menu, drag the slider of Cursor Brightness to set the cursor
brightness. The default is 80%, and the range available is from 0% to 100%.

19.6

Show Scale
In the Display setting menu, click or tap the Show Scale on/off switch to enable ordisable scale display on the screen. By default, it is ON.

19.7

Color GradeIn the Display setting menu, click or tap the Color Grade on/off switch to enable ordisable the color grade display. By default, it is OFF.
When it is enabled, different colors are displayed on the screen to indicate the timesof data acquisition or acquisition probability.

19.8

Waveform Freeze
In the Display setting menu, click or tap the Waveform Freeze on/off switch toenable or disable the waveform freeze function. By default, it is ON.
When the function is enabled, the oscilloscope displays the waveform after multiple
sampling and superposition when sampling is stopped. You can click or tap the
STOP/RUN button at the upper-right side of the screen or press the front-panel
key to stop sampling. If this function is disabled, the last triggered waveform isdisplayed.

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Store and Load

20

Store and Load
You can save the current setups, waveforms, screen image, and parameters of theoscilloscope to the internal memory or external USB storage device (such as USB
storage device) in various formats and recall the stored setups or waveforms whennecessary. You can also load the upgrade software to the system and perform theupgrade operation for the instrument.
You can also copy, delete, or rename the specified type of file from the internal
memory or external USB storage device via the disk management menu.
This oscilloscope provides one USB HOST interfaces on the front panel, which can beconnected to the USB storage device for external storage. The USB storage device
connected is marked as "Removable USB Disk (D)".

20.1

To Enter the Storage Menu
You can enter the storage setting menu in the following ways.
•

Click or tap the function navigation icon

at the lower-left corner of thescreen, and then select Storage to enter the storage setting menu.
•

Click or tap the Storage button on the toolbar to enter the storage settingmenu.

In the Storage setting menu, there are three sub-menus (Save, Load, and Upgrade)for you to choose. Select the specified sub-menu and configure the corresponding
parameters.

20.2

To Save a FileIn the Storage menu, click or tap the Save tab to enter the save setting menu. In thismenu, you can save the image, waveform, or setup files.

20.2.1To Save Image
In the Storage menu, click or tap the Save tab to enter the save operation menu. In
this menu, click or tap the drop-down button of Choose to select "Save Image" toenter the "Save Image" setting menu. Set the relevant parameters and save the image
to the internal or external memory.

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Figure 20.1 Image Saving Setting Menu
Set the image format•

FormatClick or tap the drop-down button of Format to select "*.png", "*.bmp", or"*.jpg". Then the screen image will be saved to the internal or external memoryin the selected format.

•

InvertClick or tap the Invert on/off switch to turn on/off inverting image colors.

•

Color
Click or tap the Color toggle button to select "Color" or "Gray" images.

•

HeaderClick or tap the Header on/off switch to enable or disable the display of theheader. If you select "ON", the instrument model and the image creation date
will be displayed in the header of the image after you save the image file.

Set the file saving parameters•

Set the filename
Click or tap the input field of File Name to input the file name to be saved withthe pop-up virtual keypad.

•

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Set the file path

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Store and Load

Click or tap the input field of File Path, then the disk management interface isdisplayed. Select the target directory and then click or tap OK to set the file path.
For detailed operations, refer to descriptions in Disk Management.
When a USB device is not connected, the default file path is the "Local Disk";
when a USB device is detected, the path is automatically set to "D:".
•Overlay
Click or tap the Overlay on/off switch to enable or disable the overwriting
function. When this function is enabled, the existing file in the specified file pathwill be overwritten by the newly saved file that has the same filename as theexisting one.

Click or tap Save, the current screen image is saved based on the settings and thestorage menu is disabled.
TIP
When the quick action function is set to "Save Image" or "Save Group" with "Save Image"
selected, you can press the front-panel

20.2.2

key to save the image.

To Save Wave
In the Storage menu, click or tap the Save tab to enter the save operation menu. In
this menu, click or tap the drop-down button of Choose to select "Save Wave" toenter the "Save Wave" setting menu. The main settings (e.g. channel on/off state,vertical scale, and horizontal time base) and waveform data of all enabled channel will
be saved to the internal or external memory.

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Figure 20.2 Waveform Saving Setting Menu
Set the source of the waveform data and the format of the saved waveform•

Data source
Click or tap the drop-down button of Data Source to select "Screen" or"Memory".

•

Waveform format
Click or tap the drop-down button of Format to select the format of the saved
waveform. When the data source is set to "Screen", the format can be set to"*.bin" or "*.csv"; when the data source is set to "Memory", the format can be
set to "*.bin", "*.csv", or "*.wfm".

Set the file saving parameters•

Set the filename
Click or tap the input field of File Name to input the file name to be saved withthe pop-up virtual keypad.

•

Set the file path
Click or tap the input field of File Path, then the disk management interface isdisplayed. Select the target directory and then click or tap OK to set the file path.
For detailed operations, refer to descriptions in Disk Management.
When a USB device is not connected, the default file path is the "Local Disk";
when a USB device is detected, the path is automatically set to "D:".

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Overlay
Click or tap the Overlay on/off switch to enable or disable the overwriting
function. When this function is enabled, the existing file in the specified file pathwill be overwritten by the newly saved file that has the same filename as theexisting one.

Click or tap Save, the current waveform file is saved based on the settings and thestorage menu is disabled.
TIP
When the quick action function is set to "Save Wave" or "Save Group" with "Save Wave"
selected, you can press the front-panel

20.2.3

key to save the waveform.

Save Setup
In the Storage menu, click or tap the Save tab to enter the save operation menu. In
this menu, click or tap the drop-down button of Choose to select "Save Setup" toenter the "Save Setup" setting menu. Save the settings of the oscilloscope to theinternal or external memory in "*.stp" format. When loading, the stored settings canbe recalled.

Figure 20.3 Setup Saving Setting Menu
Set the file saving parameters•

Set the filename

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Click or tap the input field of File Name to input the file name to be saved withthe pop-up virtual keypad.
•

Set the file path
Click or tap the input field of File Path, then the disk management interface isdisplayed. Select the target file path and then click or tap OK. For detailed
operations, refer to descriptions in Disk Management.
When a USB device is not connected, the default file path is the "Local Disk";
when a USB device is detected, the path is automatically set to "D:".

•Overlay
Click or tap the Overlay on/off switch to enable or disable the overwriting
function. When this function is enabled, the existing file in the specified file pathwill be overwritten by the newly saved file that has the same filename as theexisting one.

Click or tap Save, the current setup file is saved based on the settings and the storage
menu is disabled.
TIP
When the quick action function is set to "Save Setup" or "Save Group" with "Save Setup"
selected, you can press the front-panel

20.2.4

key to save the setup.

Binary Data Format (.bin)
Binary data format stores waveform data in binary format and provides data headersthat describe these data. As data are displayed in binary format, its file size is much
more smaller than that in ASCII format. If several channels are enabled, then all thedisplayed channels will be saved (save the first channel then save the second, andthen it goes on like this until all the displayed channels are saved).
Table 20.1 BIN File Format
File
HeaderWaveform Waveform Channel
HeaderData
Data
HeaderWaveform Waveform Channel
HeaderData
Data
Header

16 Bytes

140 Bytes

140 Bytes

16 Bytesn Bytes

16 Bytesn Bytes

In BIN file format, it contains the following channel data:•

CH1 Data•

CH2 Data•

CH3 Data•

CH4 Data

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Math Waveform Data

Binary Header Format
1. File Header
There is only one file header in a binary file. The file header contains the following
information.
Table 20.2 File Header

CookieVersionFile Size

Number of
Waveforms

Two-byte characters, RG, indicating that the file is the RIGOL
binary data file format.
Two-byte, indicating the file version.
An 8-byte long integer, indicating the number of bytes in the
file. It includes the header.
A 4-byte integer, indicating the number of waveforms that are
stored in the file.

2. Waveform Header
It is possible to store several waveforms in the file. Each stored waveform has awaveform header. When several channels are stored, each channel can beconsidered as a separate waveform. The waveform header contains theinformation about the type of waveform data that are stored following the
waveform data header.
Table 20.3 Waveform Header
Header Size

A 4-byte integer, indicating the number of bytes in the header.
A 4-byte integer, indicating the type of the waveform stored in
the file. It is fixed to 1.

Waveform Type

Number of
Waveform Buffers-

0 = Unknown
1 = Normal
2 = Peak Detection
3 = Average
4 = Not Used
5 = Not Used
6 = Logic

A 4-byte integer, indicating the number of waveform buffers
required to read the data. It is fixed to 1.

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Number of PointsCount

A 4-byte integer, indicating the number of waveform points inthe data.
A 4-byte integer. It is fixed to 0.
A 4-byte float, indicating the X-axis duration of the waveform

X Display Rangethat is displayed. For time-domain waveforms, it indicates theduration of the display. If the value is zero, then no data has
been acquired.
An 8-byte double-precision floating-point, indicating the Xaxis value at the left edge of the screen. For time-domain

X Display Origin

waveforms, it indicates the time at the start of the display. The
value is treated as a double precision 64-bit float point
number. If the value is zero, then no data has been acquired.
An 8-byte double-precision floating-point, indicating the

X Increment

duration between data points on the X-axis. For time-domain
waveforms, it indicates the time between points. If the value iszero, then no data has been acquired.
An 8-byte double-precision floating-point, indicating the Xaxis value of the first data point in the data recording. For

X Origintime-domain waveforms, it indicates the time of the firstpoint. The value is treated as a double precision 64-bit float
point number. If the value is zero, then no data has beenacquired.
A 4-byte integer, indicating the unit of measurement for X
values in the acquired data. It is fixed to 2.

X Units-

0 = Unknown
1 = Volts (V)
2 = Seconds (s)3 = Constant
4 = Amps (A)
5 = Decibel (dB)
6 = Hertz (Hz)A 4-byte integer, indicating the unit of measurement for Y
Y Unitsvalues in the acquired data. The possible values are listed
above under X Units.

Date

Time

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A 16-byte character array, indicating the date when the file issaved.
A 16-byte character array, indicating the time when the file issaved.

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Store and Load

Model

Channel Name

A 24-byte character array in the format of MODEL#:SERIAL#,
indicating the oscilloscope's model and serial number.
A 16-byte character array that contains the label assigned to
the waveform.

3. Waveform Data Header
A waveform may have multiple data sets. Each waveform data set has a waveform
data header. The waveform data header consists of information about the
waveform data set. The header is stored before the data set.
Table 20.4 Waveform Data Header

Header Size

A 4-byte integer, indicating the number of bytes in the
waveform data header.
A 2-byte integer, indicating the type of the waveform datastored in the file.
- 0 = Unknown- 1 = Normal 32-bit float data

Buffer Type- 2 = Maximum float data
- 3 = Minimum float data
- 4 = Not Used
- 5 = Digital unsigned 8-bit character data (for digitalchannels)

Bytes Per Point

Buffer Size

20.3

A 2-byte short integer, indicating the number of bytes perdata point.
An 8-byte long integer, indicating the number of bytes of thecurrent channel waveform data.

To Load a FileIn the storage setting menu, click or tap the Load tab to switch to the load menu. In
this menu, you can load the local file to the instrument.

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Figure 20.4 Load Setting Menu
Load Setup
Click or tap the drop-down button of Choose to select "Load Setup". Then, click or
tap File Path to load the setups from the internal memory or the external USB disk.
The default file type is "*.stp", and no other options are available. Select the file to beloaded from the memory. Click or tap Load to load the selected file.

20.4

Firmware UpgradeThis instrument supports local upgrade and online upgrade.
Local upgrade
1. In the storage setting menu, click or tap Upgrade to enter the local upgrade
setting menu.

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Figure 20.5 Upgrade Menu
2. Click or tap the input field of File Path, then the disk management interface isdisplayed. Select the upgrade file. For detailed operations, refer to DiskManagement.
3. Click or tap Upgrade to complete the local upgrade.
Online upgrade
1. First ensure that the rear-panel LAN interface is connected to the network (if you
have limited access to the Internet, please ask the administrator for permission).
2. Click or tap the function navigation icon

at the lower-left corner of the screen

to enter the function navigation.
3. Then click or tap the Upgrade icon to perform the upgrade operation.

20.5

Disk Management
You can enter the storage setting menu in the following ways.
•

Click or tap the function navigation icon

at the lower-left corner of thescreen, and then select Storage to enter the storage setting menu.
•

Click or tap the Storage button on the toolbar to enter the storage setting
menu.

Then click or tap Disk at the lower-left corner of the "Storage" menu to enter the disk
management interface, as shown in the figure below.

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Figure 20.6 Disk Management Interface
Execute the following operations through the disk management menu:
Select a Disk
Before using the external storage device, make sure that a USB storage device (FAT32/
NTFS format) is connected correctly.
By default, the "Local Disk(C)" is selected. If an external storage device is inserted,under the "Disk" menu, two available storage disks can be selected at the upper-leftcorner of the "Disk" interface: Local Disk (C) and Removable USB Disk (D). If you selectan external storage device, for example, if you select "Removable USB Disk (D)", thecontents in USB Disk(D) will be displayed.
Create a Folder
Click or tap New Folder, then a folder name input keyboard is displayed.
For how to use the keypad, refer to descriptions in Parameter Setting Method. Click or
tap any place on the screen to exit the keyboard.
Clear the Internal Memory Safely
Click or tap SecurityClear, then a prompt message "Execute secure memory wipe?" isdisplayed. Click or tap OK to clear all the files stored in the internal disk. Otherwise,
click or tap Cancel to cancel security clear operation.
Select a File
Before operating on the file or folder, first select the desired file or folder.
Click or tap the check box at the right side of the folder, if checked, it is selected, with
an iconbeing displayed. Click or tap the check box again or

to deselect it.

The check box restores its original state.
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This series supports selecting multiple files or folders to operate on. You can also clickor tap the icon

at the upper-right corner of the interface to select all the files andfolders under the current disk. Click or tap

to cancel the select-all operation.

Cut, Copy, or Paste a File or a Folder•

Cut a File to a Specified Folder
Select a specified file or folder. Click or tap Cut to cut the specified file or folder.
Then select the destination folder. Then click or tap Paste to paste the specified
file or folder to the destination folder.

•

Copy a File to a Specified Folder
Select a specified file or folder. Click or tap Copy to copy the specified file orfolder. Then select the destination folder. Then click or tap Paste to paste thespecified file or folder to the destination folder.

Delete a File or Folder
In the current folder, select the file or folder to be deleted. Click or tap Delete, then aprompt message "Are you sure to delete the file?" is displayed. Click or tap OK todelete the file. Otherwise, click or tap Cancel to cancel the deletion operation.
Rename a File or Folder
Select a specified file or folder, then click or tap Rename to input a new filename orfolder name with the pop-up virtual keypad. Then, the rename operation iscompleted.

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21

System Utility Function Setting
In the Utility menu, you can set the I/O parameters and the system-related function
parameters. You can enter the "Utility" menu in the following ways.
•

Click or tap the Notification Area at the lower-right corner of the screen. Thenthe Utility menu is displayed.

•

21.1

Click or tap> Utility to enter the Utility menu.

I/O Setting
In Utility menu, click or tap IO to enter the I/O setting menu to configure thefollowing parameters.
Network Status
Different prompts will be displayed according to the current network connection
status.
•Network Config Succeeded!

•

Acquiring IP...

•IP Conflict!

•

DISCONNECTED•DHCP Config Failed•

Read Status Fail!

•CONNECTED•

Invalid IP•

IP lost•Please wait...

MAC Address
For each instrument, the MAC address is unique. When assigning the IP address forthe instrument, the system uses the MAC address to identify the instrument.
VISA Address
Displays the VISA address currently used by the instrument.

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IP Configuration TypeThe configuration type of the IP address can be DHCP, Auto IP, or Static IP. In different
IP configuration types, the configurations for IP address and other network
parameters are different.
•

DHCP
If "DHCP" is selected, the DHCP server in the current network will assign the
network parameters (e.g. IP address, Subnet, Gateway, and DNS) for the
instrument.

•

Auto IP
When "Auto IP" is selected, the instrument will acquire the IP address ranging
from "169.254.0.1" to "169.254.255.254" and the subnet mask (255.255.0.0)
automatically based on the current network configuration. The "Auto IP" works
only when "DHCP" is not selected or the connection failed.

•

Static IP
If "Static IP" is selected, the instrument is configured with static IP. In this case,you need to disable DHCP and Auto IP manually. Then you need to configure theparameters such as "IP address", "Subnet", "Gateway", and "DNS" manually. At
this time, you can self-define the network parameters (e.g. IP address) of the
instrument.
-

Set the IP address
The format of the IP address is nnn.nnn.nnn.nnn. The range of the first
segment (nnn) of the address is from 0 to 255 (except 127); wherein, thevalid range is from 0 to 223. The range for the other three segments is from0 to 255. You are recommended to ask your network administrator for an IP
address available.
This setting will be saved to the non-volatile memory; if "Load Last" is set to"Last", then DHCP and Auto IP are disabled at the next power-on. The
instrument will load the preset IP address automatically.

-

Set the subnet mask
The format of the subnet mask is nnn.nnn.nnn.nnn. Wherein, the range of"nnn" is from 0 to 255. You are recommended to ask your network
administrator for a subnet mask available.
This setting will be saved in the non-volatile memory; if "Load Last" is set to"Last", then DHCP and Auto IP are disabled at the next power-on. The
instrument will load the preset subnet mask automatically.

-

Set the default gateway
You can set this parameter in Static IP mode. The format of the gateway is
nnn.nnn.nnn.nnn. The range of the first segment (nnn) is from 0 to 223(except 127), and the range for the other three segments is from 0 to 255.

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You are recommended to ask your network administrator for a gateway
address available.
This setting will be saved in the non-volatile memory; if "Load Last" is set to"Last", then DHCP and Auto IP are disabled at the next power-on. The
instrument will load the preset gateway automatically-

Set the DNS address
You can set this parameter in Static IP mode. The format of the DNS address
is "nnn.nnn.nnn.nnn". The range for the first segment (nnn) of the address isfrom 0 to 223 (except 127); and the range for the other three segments isfrom 0 to 255. You are recommended to ask your network administrator foran address available.
Generally, you do not need to set the DNS, so this parameter setting can beignored.

TIP•

When the three IP configuration types are all turned on, the priority of the parameter
configuration from high to low is "DHCP", "Auto IP", and "Static IP".

•The three IP configuration types cannot be all turned off at the same time.

mDNS
Click or tap the mDNS on/off switch to enable or disable the multicast Domain Name
System (mDNS). This system is used to provide the function of DNS server for service
discovery in a small network without a DNS server.
Host Name
A maximum of 26-byte strings can be supported.
Apply the Network Parameter Setting
Drag the menu up on the screen. Click or tap Apply at the bottom to validate thecurrent network parameter setting.

21.2

Basic Settings
In the Utility menu, click or tap Setup to enter the basic setting menu.
LanguageThis product supports menus in multiple languages, including the display of the help
information, prompt messages, and interface. Click or tap the drop-down button of
Language to select the specified system language.
Load Last
You can set the system configuration to be recalled when the oscilloscope is poweredon again after power-off. Click or tap "Default" or "Last" for Load last.

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System Utility Function Setting•

Last: returns to the setting of the system at last power-off.

•

Default: returns to the factory setting of the system.

Power Status•

Switch Off: After the oscilloscope is connected to power, you need to press thepower key on the front panel to power on the instrument.

•

Switch On: After the oscilloscope is connected to power, it will be powered on
immediately.

BeeperClick or tap the Beeper on/off switch to enable or disable the beeper. When the
beeper is enabled, you can hear the beeper sound in the following situations:•Use a front-panel key or a menu key•

Use the touch screen•

When a prompt message is displayed

AUX Output
You can set the type of the signal output from the [AUX OUT] connector on the rear
panel.
•

TrigOut: After this type is selected, at each trigger (hardware trigger), theoscilloscope outputs a signal from the [AUX OUT] connector on the rear panelthat can reflect the current capture rate of the oscilloscope. If this signal isconnected to a waveform display device to measure the frequency, the foundmeasurement result is the same as the current capture rate.

•

PassFail: When this type is selected, the instrument can output a positive or
negative pulse via the [AUX OUT] connector when a successful or failed event is
detected. Refer to descriptions in To Set the Output Form of the Test Results.
Enabling the Aux Output function in "PassFail" menu automatically toggles the
AUX Out parameter to "PassFail"; setting the AUX Out parameter to "TrigOut"
automatically disables the Aux Output function in "PassFail" menu.

Input Lock
Once the input lock is enabled, the input function is disabled, for which you can nolonger use the touch screen, front-panel keys, and knobs to configure the instrument.
Press the front-panel channel keys in the order of

,

,

,

to

disable the input lock.

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ExpandThe waveform display can be set to expand or compress about the "Center" or"GND".
•

Center: When the vertical scale is changed, the displayed waveform will expand
or compress about the center of the display.

•

GND: When the vertical scale is changed, the displayed waveform will expand orcompress about the ground level position of the signal.

Fine/Zoom
It sets the effect of pressing the front-panel Horizontal

21.3

SCALE knob.

•

Fine: enables or disables the fine adjustment when the knob is pressed.

•

Zoom: enables or disables the Zoom mode when the knob is pressed.

About this Oscilloscope
In Utility menu, click or tap About, and then you can view the model, version, andother information about this instrument in About menu.
•

Model
Indicates the product model.

•

Serial Number
Indicates the serial number, the unique identification for the product.

•

Firmware
Indicates the firmware version number of the product.

•

Hardware
Indicates the hardware version number of the product.

•

Build
Indicates the creation time of the software version.

•

Android.Build
Indicates the creation time of the Android operating system.

•

Android.Version
Indicates the version number of the Android operating system. For example, 7.1.
0.

•

Launcher
Indicates the desktop UI version number of the Android operating system.

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System Utility Function Setting•

WebControl
Indicates the version number of browser remote control module.

21.4

Other Settings
Open Source Acknowledgment
Click or tap Open Source Acknowledgment to view the open source
acknowledgment of this series oscilloscope in the pop-up window.

21.5

Auto Config
In "Utility" menu, click or tap Auto Config to enter the menu in which you canconfigure the Auto function.
•

Click or tap Peak to Peak on/off switch to enable or disable the peak-to-peakpriority setting. This function is intended for the shifted signal. If there is a large
deviation, you can view the signal waveform in priority when you enable thefunction.

•

Click or tap Live CH on/off switch to turn on/off examining channels that are
turned on.
If "OFF" is selected, enable the Auto function and 4 analog channels (CH1-CH4)
will be examined for signal activity in sequence. If no signal is detected for a
specified channel, the channel will be turned off; otherwise, if a signal isdetected, the channel will be autoscaled to best display the signal. If “ON” isselected, enable the Auto function and only the channels that are turned on will
be examined.

•

Click or tap Overlay on/off switch to enable or disable the waveform overlay
display function. If enabled, waveforms of different channels will be displayed in
the same position of the screen; if disabled, waveforms of different channels will
be displayed on the screen from top to bottom in sequence.

•

Click or tap Keep Coupling on/off switch to turn on/off maintaining channel
coupling. If "ON" is selected, enable the Auto function and the channel couplingsetting is maintained; if "OFF" is selected, the channel coupling is DC coupling by
default.

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21.6

SelfCalThe self-calibration program can quickly make the oscilloscope to work in an optimal
state to get the precise measurement results. You can perform self-calibration at any
time, especially when the changes of the ambient temperature reach or exceed 5℃.
Make sure that the oscilloscope has been warmed up or operating for more than 30
minutes before the self-calibration.
In "Utility" menu, click or tap SelfCal, the self-calibration menu is as shown below.

Figure 21.1 Self-calibration Menu•

Click or tap Start, and then the oscilloscope will start to execute the selfcalibration program.

•

After starting the self-calibration program, click or tap Exit to cancel selfcalibration operation at any time.

•

21.7

Click or tap Close to close the self-calibration information window.

Option List
In the "Utility" menu, click or tap Options to view all the options of the instrument.

21.8

Quick Action Settings
In Utility menu, click or tap Quick to enter the menu to configure the quick action
key on the front panel.

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Figure 21.2 Quick Menu
Save Image•

Click or tap Save Image, then Operation is set to "Save Image".

•In the Format menu item, available image types include "png", "bmp", and"jpg".

•

Click or tap the Invert on/off switch to turn on/off inverting image colors.

•

Click or tap "Color" or "Gray" for Color to select the desired image color.

After setup, click or tap the

key at the upper-right corner of the front panel tocapture the current screen and save the image with the specified format. The location
where the file is saved depends on the File Path setting in Storage menu. For details,
please refer to To Save a File.
Save Wave•

Click or tap Save Wave, then Operation is set to "Save Wave".

•

Select "Memory" or "Screen" under Data Source as the source of the saved
waveform.

•

Available options under Format include "bin" and "csv".

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After setup, click or tap the

key at the upper-right corner of the front panel tosave the waveform based on the settings. The location where the file is saved
depends on the File Path setting in Storage menu. For details, please refer to To Savea File.
Save Setup
Click or tap Save Setup, then Operation is set to "Save Setup".
After setup, click or tap the

key at the upper-right corner of the front panel tosave the setup file suffixed with ".stp". The location where the file is saved depends on
the File Path setting in Storage menu. For details, please refer to To Save a File.
All Measurements•

Click or tap All Measure, then Operation is set to "All Measure".

•

In All Measure item, click or tap the drop-down button to select the channel(CH1-CH4) to measure.

After setup, click or tap the

key at the upper-right corner of the front panel toperform the measurement on the specified channel.
Reset Statistics•

Click or tap Stat Reset, then Operation is set to "Stat Reset".

•

Click or tap "Measure" or "Pass/Fail" under Stat Reset to reset all statistics of the"Measure" or "Pass/Fail" function.

After setup, click or tap the

key at the upper-right corner of the front panel.

This resets all statistics of the specified function in the Result sidebar at the right sideof the screen and starts the measurements again.
Waveform Recording
Click or tap Record, then Operation is set to "Record".
After setup, click or tap the

key at the upper-right corner of the front panel toperform the waveform recording.
Save Group•

Click or tap Save Group, then Operation is set to "Save Group".

•

Under Save Group, select one or more items from "Save Image", "Save Wave",and "Save Setup".

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System Utility Function Setting

After setup, click or tap the

key at the upper-right corner of the front panel tosave the selected items based on the settings. The location where the file is saved
depends on the File Path setting in Storage menu. For details, please refer to To Savea File.

21.9

Self-check
In Utility menu, click or tap Self Check to enter the "Self Check" setting. You can test
the following self-check items for the device.
Key Test
Click or tap Key Test to enter the key test interface (virtual front-panel key).
At this time, you can press the front-panel keys to check whether the virtual keys arehighlighted. If yes, it indicates that the keys work normally; if no, it indicates that
there's something wrong with the keys. Click or tap Exit at the lower-left corner of theinterface to exit the key test interface.
Touch Test
Click or tap Touch Test to enter the touch screen test interface.
Slide with your finger on the screen. If there is a line displaying at the empty area
where you slide on the screen and the box that you tap turns out to be filled withgreen background, it indicates that the touch function of this area is normal. Click or
tap Exit at the lower-left corner of the interface to exit the touch screen test interface.
Screen Test
Click or tap Screen Test to enter the screen test interface and check whether thedefective pixel exists.
There are 15 screen test interfaces. Click or tap the screen to switch to the next screen
test interface. Click or tap Exit at the upper-left corner of the interface to exit thescreen test interface.
Board Test
Click or tap Board Test, then the board test interface is displayed. Check whether the
status of each module is in good condition.

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Remote Control

22

Remote Control
The following ways of remote control are supported:•

User-defined Programming
Users can program and control the instrument by using the SCPI (Standard
Commands for Programmable Instruments) commands. For details about the
SCPI commands and programming, refer to Programming Guide of this productseries.

•PC Software
Users can use the PC software to send commands to control the instrument
remotely. RIGOL Ultra Sigma is recommended. You can download the softwarefrom RIGOL official website (http://www.rigol.com).
Operation Procedures:•-Set up communication between the instrument and PC.

-

Run Ultra Sigma and search for the instrument resource.

-

Open the remote command control panel to send commands.

Web Control
This instrument supports Web Control. Connect the instrument to the network,
then input the IP address of the instrument into the address bar of the browser
of your computer. The web control interface is displayed. Click Web Control toenter the web control page. Then you can view the display of the real-time
interface of the instrument. Through the Web Control method, you can migrantthe device control to the control terminals (e.g. PC, Mobile, iPad, and other smart
terminals) to realize remote control of the instrument. When you first log in to
the Web Control, the user name is "admin" and password is "rigol".

This instrument can be connected to the PC via the USB and LAN interface to set up
communication and realize remote control through the PC. The remote control can berealized by using SCPI (Standard Commands for Programmable Instruments)
commands.
This chapter will illustrate how to use the RIGOL Ultra Sigma software to remotely
control the instrument via various interfaces.
CAUTION
Before connecting the communication cable, please turn off the instrument to avoid
causing damage to the communication interfaces.

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Remote Control

22.1

Remote Control via USB
1. Connect the device
Use the USB cable to connect the rear-panel USB DEVICE interface of the
instrument to the USB HOST interface of the PC.
2. Search for the device resource
Start up Ultra Sigma and the software will automatically search for the resource
currently connected to the PC via the USB interface. You can also click USB-TMC tosearch for the resource.
3. View the device resource
The resources found will appear under the "RIGOL Online Resource" directory, andthe model number and USB interface information of the instrument will also be
displayed.
4. Control the instrument remotely
Right-click the device resource name and select "SCPI Panel Control" to open the
remotely command control panel. Then you can send commands and read data
through the panel. For details about the SCPI commands and programming, referto the Programming Guide of this instrument.

22.2

Remote Control via LAN
1. Connect the device
Use the network cable to connect the instrument to your local area network (LAN).
2. Configure network parameters
Configure the network parameters of the instrument according to I/O Setting.
3. Search for Search device resource
Start up Ultra Sigma and click LAN to open the panel as shown in the figure below.
Click Search and the software searches for the instrument resources currently
connected to the LAN and the resources found are displayed at the right section of
the window as shown in the figure below. Click OK to add it.

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Remote Control

Besides, you can input the IP address of the instrument manually into the text fieldunder "Manual Input LAN Instrument IP", then click TEST. If the instrument passes
the test, click Add to add the instrument to the LAN instrument resource list in theright section; if the instrument fails the test, please check whether the IP addressthat you input is correct, or use the auto search method to add the instrument
resource.
4. View the device resource
The resources found will appear under the "RIGOL Online Resource" directory.
5. Control the instrument remotely
Right-click the device resource name and select "SCPI Panel Control" to open the
remotely command control panel. Then you can send commands and read data
through the panel.
6. Load LXI webpage
As this instrument conforms to LXI CORE 2011 DEVICE standards, you can load LXI
web page through Ultra Sigma (right-click the instrument resource name andselect "LXI-Web"). Various important information about the instrument (including
the model, manufacturer, serial number, description, MAC address, and IP address)
will be displayed on the web page. You can also directly input the IP address of the
instrument in the address bar of the PC browser to load the LXI web page.

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Troubleshooting

23

Troubleshooting
1. When I power on the instrument, the instrument's screen stays black and does
not display anything.
a. Check whether the power supply has been connected correctly.
b. Check whether the power key is really pressed.
c. Restart the instrument after finishing the above inspections.
d. If the problem still persists, please contact RIGOL.
2. No waveform of the signal is displayed on the screen.
a. Check whether the probe is properly connected to the item under test.
b. Check whether there are signals generated from the item to be tested (you canconnect the probe compensation output signal to the faulty channel to locate
the problem, and then determine whether the channel or the item to be tested
has a problem).
c. Resample the signal.
d. If the problem still persists, please contact RIGOL.
3. The USB storage device cannot be recognized.
a. Check whether the USB storage device can work normally when connected toother instruments or PC.
b. Make sure that the USB storage device is FAT32/NTFS format. The instrument
doesn't support hardware USB storage device.
c. After restarting the instrument, insert the USB storage device again to check
whether it can work normally.
d. If the USB storage device still cannot work normally, please contact RIGOL.
4. The touch-enabled operation does not work.
a. Check whether you have locked the touch screen. If yes, unlock the touch
screen.
b. Check whether the screen or your finger is stained with oil or sweat. If yes,
please clean the screen or dry your hands.
c. Check whether there is a strong magnetic field around the instrument. If the
instrument is close to the strong magnetic field (e.g. a magnet), please movethe instrument away from the magnet field.
d. If the problem still persists, please contact RIGOL.

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Appendix

24

Appendix

24.1

Appendix A: Options and Accessories
Order Information

Order No.

Model
100 MHz, 1.25 GSa/s, 25 Mpts, 4CH

DHO814100 MHz, 1.25 GSa/s, 25 Mpts, 2CH

DHO81270 MHz, 1.25 GSa/s, 25 Mpts, 4CH

DHO80470 MHz, 1.25 GSa/s, 25 Mpts, 2CH

DHO802Standard Accessories
Power Adaptor Conforming to the Standard of the
Destination Country——

Banana-Plug Ground Connecting Cable——

DHO814/DHO804: Passive Probe x4 (150 MHz)DHO812/DHO802: Passive Probe x2 (150 MHz)

PVP3150

NOTE
For all the mainframes, accessories and options, please contact the local office of RIGOL.

24.2

Appendix B: Warranty
RIGOL TECHNOLOGIES CO., LTD. (hereinafter referred to as RIGOL) warrants that the
product mainframe and product accessories will be free from defects in materials andworkmanship within the warranty period. If a product proves defective within thewarranty period, RIGOL guarantees free replacement or repair for the defective
product.
To get repair service, please contact your nearest RIGOL sales or service office.
There is no other warranty, expressed or implied, except such as is expressly set forth
herein or other applicable warranty card. There is no implied warranty ofmerchantability or fitness for a particular purpose. Under no circumstances shall
RIGOL be liable for any consequential, indirect, ensuing, or special damages for any
breach of warranty in any case.

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Appendix

24.3

Appendix C: Factory Settings
Press the front-panel

or click/tap Default on the Toolbar and a prompt

message "Restore default settings?" is displayed. Click or tap OK to restore theinstrument to its factory default settings, as shown in the table below.
Table 24.2 Factory Settings
Parameter

Factory Settings

Horizontal
Horizontal Time Base

2 μs

Horizontal Position

0s

Delayed Sweep

OFF

Roll

Auto

Fine

OFF

Horizontal Expansion

CenterAcquisition
Acquisition Mode

NormalMemory Depth

10 kpts

Vertical
CH1 On/OffON

CH2 On/Off

OFF

CH3 On/Off

OFF

CH4 On/Off

OFF

Impedance

1 MΩ

Fine

OFF

Vertical Scale

50 mV

Vertical Offset

0V

Channel Unit

[V]

Channel Coupling

DC

Bias

0V

BW Limit

OFF

Channel Delay0s

Display LabelOFF

InvertOFF

Attenuation

1X

Trigger
Trigger Type

Edge Trigger

Trigger Mode

Auto

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Appendix

Parameter

Factory Settings

Source Selection

CH1

Edge Type

Rising

Trigger Coupling

DC

Trigger Holdoff

8 ns

Noise Rejection

OFF

Display
Display Type

VectorPersistence TimeMin

Waveform Intensity

50%

Grid

FULL

Grid Brightness

50%

Window Transparency

50%

Cursor Brightness

80%

Show ScaleON

Color Grade

OFF

Waveform FreezeON

MeasureThresholdOFF

Indicator

OFF

HistogramOFF

Statistics

OFF

Count

1,000

Display Type%

Source

CH1

Upper

90%

Mid

50%

Lower

10%

Amplitude Measurement
MethodAuto

RegionMain

CursorMode

OFF

ManualSourceCH1

Select

X

AX BX

OFF

AY

-6 μs

BY

6 μs

Track

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Appendix

Parameter

Factory Settings

AX Source

CH1

BX Source

CH1

AX BX

OFF

Track

X

AX

-6 μs

BX

6 μs

XY
Select

X

AX BX

OFF

AX

-150 mV

BX

150 mV

Frequency Counter
SourceCH1

Statistics

OFF

MeasureFrequency

Resolution

4

DVM
SourceCH1Mode

AC RMS

BeeperOFF

Limits Condition Setting

In Limits

Upper

1V

Lower

0V

Save Image
Format*.png

Invert

OFF

Color

Color

HeaderON

OverlayOFF

Save Wave
Data source

ScreenFormat*.bin

Save Setup
File Type*.stp

Load Setup
File Type*.stp

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Appendix

Parameter

Factory Settings

System Setting
BeeperOFF

AUX Output

TrigOut

Input Lock

OFF

ExpandGND

Fine/Zoom

Fine

Auto Config
Peak to Peak

ON

Live CH

OFF

OverlayON

Coupling

OFF

Quick Settings
Operation

Save Image

Format*.png

Invert

OFF

Color

Color

Pass/Fail Test
EnableOFF

SourceCH1

Y Mask

480 mdiv

X Mask240 mdiv

Format (to load file)*.pf

Format (to save file)*.pfFile Name

RigolDS

Aux Output

OFF

Pulse

1 μs

Output Event

FailPolarity

Positive

Error Action

Stop

Waveform Recording
Waveform Recording

OFF

RecordInterval

10 ns

Frames1,000

BeeperPlay
Minimize

OFF

Play Mode
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Appendix

Parameter

Factory Settings

Play Sequence
Interval

100 msMath Operation
InvertOFF

ExpandGND

Display Label

OFF

Grid

FULL

A+B
OperationOFF

Source A

CH1

Source B

CH1

Scale

500 mV

Offset0V

A-B
OperationOFF

Source A

CH1

Source B

CH1

Scale

500 mV

Offset0V

A×B
OperationOFF

Source A

CH1

Source B

CH1

Scale

500 mU

Offset0U

A÷BOperationOFF

Source A

CH1

Source B

CH1

Scale

500 mU

Offset0U

FFT
OperationOFF

SourceCH1

X

Span-Center

Unit

dBm/dBV

Center Frequency

5 MHz

Frequency Range

10 MHzVertical Scale

20 dB

Offset0 dBVCopyright ©RIGOL TECHNOLOGIES CO., LTD. All rights reserved.

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Appendix

Parameter

Factory Settings

Window Function

Hanning

Color GradeOFF

Peak Search

OFF

Peak Number

5

Threshold5.5 dBV

Threshold

1.8 dBOrder

Amp Order

A&&B
OperationOFF

Source A

CH1

Source B

CH1

Waveform Size

MediumOffset0 div

Sensitivity

300 mdiv

Thre.CH1

0V

Thre.CH2

0V

Thre.CH30V

Thre.CH4

0V

A||B
OperationOFF

Source A

CH1

Source B

CH1

Waveform Size

MediumOffset0 div

Sensitivity

300 mdiv

Thre.CH1

0V

Thre.CH2

0V

Thre.CH30V

Thre.CH4

0V

A^B
OperationOFF

Source A

CH1

Source B

CH1

Waveform Size

MediumOffset0 div

Sensitivity

300 mdiv

Thre.CH1

0V

Thre.CH2

0V

Thre.CH30V

Thre.CH4

0V!A

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Appendix

Parameter

Factory Settings

OperationOFF

Source A

CH1

Waveform Size

MediumOffset0 div

Sensitivity

300 mdiv

Thre.CH1

0V

Thre.CH2

0V

Thre.CH30V

Thre.CH40V

Intg
OperationOFF

SourceCH1

Scale

500 mV*s

Offset0 V*sOffset0V

Diff
OperationOFF

SourceCH1

Scale

500 mV/s

Offset

0 V/s

Smooth5

Sqrt
OperationOFF

SourceCH1

Scale

500 mU

Offset0U

Lg
OperationOFF

SourceCH1

Scale

500 mU

Offset0U

Ln
OperationOFF

SourceCH1

Scale

500 mU

Offset0U

Exp
OperationOFF

SourceCH1

Scale

500 mU

Offset0U

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Appendix

Parameter

Factory Settings

Abs
OperationOFF

SourceCH1

Scale

500 mV

Offset0V

Low Pass
OperationOFF

SourceCH1

Scale

500 mV

Offset0V

ωc

20 MHzHigh Pass
OperationOFF

SourceCH1

Scale

500 mV

Offset0V

ωc

20 MHzBand Pass
OperationOFF

SourceCH1

Scale

500 mV

Offset0V

ωc1

20 MHzωc2

40 MHzBand Stop
OperationOFF

SourceCH1

Scale

500 mV

Offset0V

ωc1

20 MHzωc2

40 MHzAX+B
OperationOFF

SourceCH1

Scale

500 mV

Offset

0V

A

1

B

0

Ref
Current

Ref1

SourceCH1

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Appendix

Parameter

Factory Settings

Vertical Scale

50 mV

Vertical Offset

0V

Label

REF1

Label Display

OFF

Color

OrangeDecodeBus Type

Parallel

Bus Status

OFF

Format

Hex

Label

ON

Event Table

OFF

Parallel
CLK

OFF

Bus

CH1

Threshold

0V

EndianInvertPolarity

Positive

RS232
TX

CH1

RX

OFF

Threshold

0V

Polarity

Positive

Baud Rate

9.6 kbps

Data

8 bitsEndianLSBParityNone

Stop Bit

1 bit

I2C
CLK

CH1

SCL Thre

0V

Data

CH2

SDA Thre

0V

Exchange

SCL/SDA

R/W

Without

SPI
CLK

CH1

CLK Threshold

0V

Edge Type

RisingMISO

CH2MISO Threshold

0V

MOSI

OFF

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Appendix

Parameter

Factory Settings

Mode

CS

CS

CH3

CS Threshold

0V

CS Polarity

Negative

Polarity

Positive

Width

8

EndianMSBHistogram Analysis
EnableOFF

Type

Horizontal

SourceCH1

Height2 div

Left Limit-4 μs

Right Limit

4 μs

Top Limit

100 mV

Bottom Limit-50 mV

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