SDS2000X HD Series
Digital Oscilloscope
Service Manual
EN01A

Contents
1

2

IMPORTANT SAFETY INFORMATION ............................................................................................... 3
1.1

GENERAL SAFETY SUMMARY ............................................................................................................................ 3

1.2

SAFETY TERMS AND SYMBOLS .......................................................................................................................... 6

1.3

WORKING ENVIRONMENT ................................................................................................................................. 7

1.4

COOLING REQUIREMENTS ................................................................................................................................ 8

1.5

POWER AND GROUNDING REQUIREMENTS ......................................................................................................... 9

1.6

CLEANING ..................................................................................................................................................... 10

1.7

ABNORMAL CONDITIONS ................................................................................................................................ 10

1.8

SAFETY COMPLIANCE .................................................................................................................................... 11

FIRST STEPS .................................................................................................................................... 12
2.1

DELIVERY CHECKLIST .................................................................................................................................... 12

2.2

QUALITY ASSURANCE .................................................................................................................................... 122.3

MAINTENANCE AGREEMENT ............................................................................................................................ 123

DOCUMENT CONVENTIONS ........................................................................................................... 13

4

PREPARE INFORMATION ................................................................................................................ 14
4.1

4.1.1

Power-on Inspection ............................................................................................................................ 14

4.1.2

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

4.1.3

Auto Setup........................................................................................................................................... 16

4.1.4

Self-Calibration .................................................................................................................................... 16

4.2

5

FUNCTIONAL CHECK ...................................................................................................................................... 14

INTERFACE TEST ........................................................................................................................................... 18

4.2.1

USB Host Test..................................................................................................................................... 18

4.2.2

USB Device Test ................................................................................................................................. 19

4.2.3

LAN Port Test ...................................................................................................................................... 20

4.2.4

Pass/Fail out Test ................................................................................................................................ 22

PERFORMANCE TEST ..................................................................................................................... 25
5.1

TO VERIFY DC GAIN ACCURACY ..................................................................................................................... 27

5.2

TO VERIFY OFFSET ACCURACY ...................................................................................................................... 33

5.3

TO VERIFY DC MEASUREMENT ACCURACY ...................................................................................................... 36

5.4

TO VERIFY BANDWIDTH.................................................................................................................................. 37

5.5

TO VERIFY TIME BASE ACCURACY .................................................................................................................. 40

5.6

TO VERIFY TRIGGER LEVEL ............................................................................................................................ 41

5.7

TO VERIFY EXT TRIGGER LEVEL ..................................................................................................................... 42

5.8

TO VERIFY TRIGGER SENSITIVITY.................................................................................................................... 43

5.9

TO VERIFY CHANNEL SKEW ............................................................................................................................ 45

5.10

TO VERIFY INPUT IMPEDANCE ......................................................................................................................... 46

SDS2000X HD Service Manual

1

6

DISASSEMBLY PROCEDURES ....................................................................................................... 48
6.1

SAFETY CONSIDERATION AND CAUTIONS ......................................................................................................... 48

6.2

TOOLS LISTS................................................................................................................................................. 49

6.3

DISASSEMBLY PROCEDURES .......................................................................................................................... 49

6.3.1

To Remove the Handle and Foot ........................................................................................................ 49

6.3.2

To Remove the Rear Cover................................................................................................................. 50

6.3.3

To Remove the Rear Metal Cover ....................................................................................................... 51

6.3.4

To Remove the Back-Chassis Module ................................................................................................ 52

6.3.5

To Remove the Power Supply Module, Fan and I/O board ................................................................. 53

6.3.6

To Remove Front Panel ...................................................................................................................... 54

6.3.7

To Remove the Probe interface board and Mainboard ........................................................................ 55

6.3.8

To Remove the Rubber Keypad and Keyboard ................................................................................... 56

7

SOLVING GENERAL PROBLEMS ................................................................................................... 57

8

TROUBLESHOOTING....................................................................................................................... 60
8.1

SAFETY CONSIDERATION AND CAUTIONS ......................................................................................................... 60

8.2

REQUIRED EQUIPMENT .................................................................................................................................. 61

8.3

TROUBLESHOOTING FLOWCHART .................................................................................................................... 61

8.4

TO CHECK THE POWER SUPPLY MODULE ........................................................................................................ 62

8.5

TO CHECK THE ACQUISITION BOARD ............................................................................................................... 63

8.5.1

Acquisition Board Drawing .................................................................................................................. 63

8.5.2

Check the board-level power supplies ................................................................................................. 64

8.5.3

Check the clock ................................................................................................................................... 68

8.6

2

TO CHECK THE LCD ...................................................................................................................................... 70

8.6.1

To Check the LCD Power Supply ........................................................................................................ 70

8.6.2

To Check the LCD Signal .................................................................................................................... 70

SDS2000X HD Service Manual

1

Important Safety Information

This manual contains information and warnings that must be followed by the user for safe operationand to keep the product in a safe condition.

1.1

General Safety Summary

Carefully read the following safety precautions to avoid personal injury and prevent damage to the
instrument and any products connected to it. To avoid potential hazards, please use the instrument
as specified.

To Avoid Fire or Personal Injury.

Use Proper Power Line.
Only use a local/state-approved power cord for connecting the instrument to mains power sources.

Ground the Instrument.
The instrument grounds through the protective terra conductor of the power line. To avoid electric
shock, the ground conductor must be connected to the earth. Make sure the instrument is grounded
correctly before connecting its input or output terminals.

Connect the Signal Wire Correctly.
The potential of the signal wire is equal to the earth, so do not connect the signal wire to a high voltage.
Do not touch the exposed contacts or components.

Look over All Terminals’ Ratings.
To avoid fire or electric shock, please look over all ratings and signed instructions of the instrument.
Before connecting the instrument, please read the manual carefully to gain more information about
the ratings.

Equipment Maintenance and Service.
SDS2000X HD Service Manual3When the equipment fails, please do not dismantle the machine for maintenance. The equipment
contains capacitors, power supply, transformers, and other energy storage devices, which may cause
high voltage damage. The internal devices of the equipment are sensitive to static electricity, anddirect contact is easy to cause irreparable damage to the equipment. It is necessary to return to thefactory or the company's designated maintenance organization for maintenance. Be sure to pull out
the power supply when repairing the equipment. Live line operation is strictly prohibited. The
equipment can only be powered on when the maintenance is completed and the maintenance isconfirmed to be successful.

Identification of Normal State of Equipment.
After the equipment is started, there will be no alarm information and error information at the interface
under normal conditions. The curve of the interface will scan from left to right freely. If there is a buttonin the scanning process or there is an alarm or error prompt, the device may be in an abnormal state.
You need to view the specific prompt information. You can try to restart the setting. If the fault
information is still in place, do not use it for testing. Contact the manufacturer or the maintenancedepartment designated by the manufacturer to carry out maintenance to avoid the wrong test datacaused by the use of the fault or endanger the personal safety.

Not Operate with Suspected Failures.
If you suspect that there is damage to the instrument, please let qualified service personnel check it.

Avoid Circuit or Wire Exposed Components Exposed.
Do not touch exposed contacts or components when the power is on.

Do not operate in wet/damp conditions.

Do not operate in an explosive atmosphere.

Keep the surface of the instrument clean and dry.

Only probe assemblies that meet the requirement of UL61010-031 and CAN/CSA-C22.2
No.61010-031 shall be used.
4

SDS2000X HD Service ManualOnly a lithium battery with the same specifications as the original battery should be used toreplace the battery on board.

Not to use the equipment for measurements on mains circuits, not to use the equipment formeasurements on voltage exceed the voltage range describe in the manual. The maximum
additional transient voltage cannot exceed 1300 V.

The responsible body or operator should refer to the instruction manual to preserve theprotection afforded by the equipment. If the equipment is used in a manner not specified by
the manufacturer, the protection provided by the equipment may be impaired.

Any parts of the device and its accessories are not allowed to be changed or replaced, otherthan authorized by the manufacturer or agent.

SDS2000X HD Service Manual

5

1.2

Safety Terms and Symbols

When the following symbols or terms appear on the front or rear panel of the instrument or in thismanual, they indicate special care in terms of safety.

This symbol is used where caution is required. Refer to the accompanying
information or documents to protect against personal injury or damage to the
instrument.
This symbol warns of a potential risk of shock hazard.

This symbol is used to denote the measurement ground connection.

This symbol is used to denote a safety ground connection.
This symbol shows that the switch is an On/Standby switch. When it is pressed,
the oscilloscope’s state switches between Operation and Standby. This switch
does not disconnect the device's power supply. To completely power off theoscilloscope, the power cord must be unplugged from the AC socket after theoscilloscope is in the standby state.
This symbol is used to represent alternating current, or " AC ".
The " CAUTION " symbol indicates a potential hazard. It calls attention to a
CAUTION

procedure, practice, or condition which may be dangerous if not followed. Do notproceed until its conditions are fully understood and met.
The " WARNING " symbol indicates a potential hazard. It calls attention to a

WARNINGprocedure, practice, or condition which, if not followed, could cause bodily injury
or death. If a WARNING is indicated, do not proceed until the safety conditions
are fully understood and met.

6

SDS2000X HD Service Manual

1.3

Working Environment

The design of the instrument has been verified to conform to the EN 61010-1 safety standard per thefollowing limits:

Environment
The instrument is used indoors and should be operated in a clean and dry environment with anambient temperature range.

Note: Direct sunlight, electric heaters, and other heat sources should be considered when evaluating
the ambient temperature.

Warning: Do not operate the instrument in explosive, dusty, or humid
environments.

Ambient Temperature
Operating: 0℃ to +50℃
Non-operating: -30℃ to +70℃

Note: Direct sunlight, radiators, and other heat sources should be taken into account when assessing
the ambient temperature.

Humidity
Operating: 5% ~ 90% RH, 30℃, derate to 50 % RH at 40℃
Non-operating: 5% ~ 95% RH

AltitudeOperating: ≤ 3,000 m, 25℃
Non-operating: ≤ 15,000 m

SDS2000X HD Service Manual

7Installation ( overvoltage ) Category
This product is powered by mains conforming to installation ( overvoltage ) Category II.
Note: Installation ( overvoltage ) category I refers to situations where equipment measurement
terminals are connected to the source circuit. In these terminals, precautions are done to limit thetransient voltage to a correspondingly low level.
Installation ( overvoltage ) category II refers to the local power distribution level which applies toequipment connected to the AC line ( AC power ).

Degree of Pollution
The oscilloscopes may be operated in environments of Pollution Degree II.
Note: Degree of Pollution II refers to a working environment that is dry and non-conductive pollution
occurs. Occasional temporary conductivity caused by condensation is expected.

IP Rating
IP 20 ( as defined in IEC 60529 ).

1.4

Cooling Requirements

This instrument relies on forced air cooling with internal fans and ventilation openings. Care must be
taken to avoid restricting the airflow around the apertures ( fan holes ) at each side of the oscilloscope.
To ensure adequate ventilation it is required to leave a 15 cm ( 6 inches ) minimum gap around thesides of the instrument.

CAUTION: Do not block the ventilation holes located on both sides of theoscilloscope.

CAUTION: Do not allow any foreign matter to enter the oscilloscope through theventilation holes, etc.

8

SDS2000X HD Service Manual

1.5Power and Grounding Requirements

The instrument operates with a single-phase, 100 to 240 Vrms ( +/-10% ) AC power at 50/60 Hz ( +/5% ).

No manual voltage selection is required because the instrument automatically adapts to line voltage.

Depending on the type and number of options and accessories ( probes, PC port plug-in, etc .) , theinstrument can consume up to 120 W of power.

Note: The instrument automatically adapts to the AC line input within the following ranges:
Voltage Range

90 - 264 Vrms

Frequency Range

47 - 63 Hz

The instrument includes a grounded cord set containing a molded three-terminal polarized plug anda standard IEC 320 ( Type C13 ) connector for making line voltage and safety ground connection.
The AC inlet ground terminal is connected directly to the frame of the instrument. For adequate
protection against electrical shock hazards, the power cord plug must be inserted into a mating AC
outlet containing a safety ground contact. Use only the power cord specified for this instrument andcertified for the country of use.

Warning: Electrical Shock Hazard!
Any interruption of the protective conductor inside or outside of the oscilloscope,or disconnection of the safety ground terminal creates a hazardous situation.
Intentional interruption is prohibited.

The position of the oscilloscope should allow easy access to the socket. To make the oscilloscopecompletely power off, unplug the instrument power cord from the AC socket.

The power cord should be unplugged from the AC outlet if the oscilloscope is not to be used for an
extended period.

SDS2000X HD Service Manual

9CAUTION: The outer shells of the front panel terminals (CH1, CH2, CH3, CH4,
EXT) are connected to the instrument’s chassis and therefore to the safety
ground.

1.6

Cleaning

Clean only the exterior of the instrument, using a damp, soft cloth. Do not use chemicals or abrasive
elements. Under no circumstances allow moisture to penetrate the instrument. To avoid electricalshock, unplug the power cord from the AC outlet before cleaning.

Warning: Electrical Shock Hazard!
No operator serviceable parts inside. Do not remove covers.
Refer servicing to qualified personnel

1.7

Abnormal Conditions

Do not operate the oscilloscope if there is any visible sign of damage or has been subjected to severetransport stresses.

If you suspect the oscilloscope’s protection has been impaired, disconnect the power cord and secure
the instrument against any unintended operation.

Proper use of the instrument depends upon careful reading of all instructions and labels.

Warning: Any use of the oscilloscope in a manner not specified by the
manufacturer may impair the instrument’s safety protection. This instrument
should not be directly connected to human subjects or used for patient monitoring.

10

SDS2000X HD Service Manual1.8

Safety ComplianceThis section lists the safety standards with which the product complies.

U.S. nationally recognized testing laboratory listing

UL 61010-1:2012/R: 2018-11. Safety Requirements for Electrical Equipment for Measurement,
Control, and Laboratory Use – Part 1: General Requirements.



UL 61010-2-030:2018. Safety Requirements for Electrical Equipment for Measurement, Control,and Laboratory Use – Part2-030: Particular requirements for testing and measuring circuits.

Canadian certification


CAN / CSA-C22.2 No. 61010-1:2012 / A1:2018-11. Safety Requirements for Electrical Equipment
for Measurement, Control, and Laboratory Use – Part 1: General Requirements.



CAN / CSA-C22.2 No. 61010-2-030:2018. Safety Requirements for Electrical Equipment for
Measurement, Control, and Laboratory Use – Part 2-030: Particular requirements for testing andmeasuring circuits.

SDS2000X HD Service Manual112First Steps

2.1

Delivery Checklist

First, verify that all items listed on the packing list have been delivered. If you note any omissions or
damage, please contact your nearest SIGLENT customer service center or distributor as soon as
possible. If you fail to contact us immediately in case of omission or damage, we will not be
responsible for replacement.

2.2

Quality Assurance

The oscilloscope has a 3-year warranty ( 1-year warranty for probes and accessories ) from the dateof shipment, during normal use and operation. SIGLENT can repair or replace any product that isreturned to the authorized service center during the warranty period. We must first examine theproduct to make sure that the defect is caused by the process or material, not by abuse, negligence,
accident, abnormal conditions, or operation.

SIGLENT shall not be responsible for any defect, damage, or failure caused by any of the following:a)

Attempted repairs or installations by personnel other than SIGLENT.

b)

Connection to incompatible devices / incorrect connection.

c)

For any damage or malfunction caused by the use of non-SIGLENT supplies. Furthermore,
SIGLENT shall not be obligated to service a product that has been modified. Spare,replacement parts, and repairs have a 90-day warranty.

The oscilloscope's firmware has been thoroughly tested and is presumed to be functional.
Nevertheless, it is supplied without warranty of any kind covering detailed performance. Products notmade by SIGLENT are covered solely by the warranty of the original equipment manufacturer.

2.3

Maintenance Agreement

We provide various services based on maintenance agreements. We offer extended warranties aswell as installation, training, enhancement and on-site maintenance, and other services throughspecialized supplementary support agreements. For details, please consult your local SIGLENT
customer service center or distributor.
12

SDS2000X HD Service Manual3

Document Conventions

For convenience, text surrounded by a box border is used to represent the button of the front panel.
For example,

Default

represents the "Default" button on the front panel.

Text with shading is used to represent the touchable or clickable menu / button / region on the touch
screen. For example, Display represents the " Display " menu on the screen:

For the operations that contain multiple steps, the description is in the form of " Step 1 > Step 2 >...".
As an example, follow each step in the sequence to enter the upgrade interface:
Measure＞ Tools ＞ Track

Press theMeasurebutton on the front panel as step 1, click the Tools option on the screen as

step 2, and click the Track option on the screen as step 3 to enter the Track setting menu.

SDS2000X HD Service Manual13

4

Prepare Information

Before initiating performance verification or any adjustments, it is recommended the user follow theseprocedures. The following topics are discussed in this chapter.
How to perform functional checks



How to operate standard interface tests

How to use the self-calibration routine

How to recall factory default settings

For more detailed information about oscilloscope operation, please refer to the User Manual.

4.1

Functional Check

The functional check details four types of checks used to determine if the oscilloscope is operating
properly.

4.1.1

Power-on Inspection

The standard power supply for the instrument is 100~240 V, 50/60 Hz. Please use the power cord
provided with the instrument to connect it to AC power.

Figure 1 Connect the power cord

14

SDS2000X HD Service Manual

CAUTION: To avoid electric shock, make sure that the instrument is correctly
grounded to the earth before connecting AC power.

Press the Power button located at the lower-left corner of the front panel to start the oscilloscope.
After the boot-up the oscilloscope will begin to perform its power-on tests automatically, after which
theDefault

4.1.2

button can be pressed to recall the factory default settings.

Probe Compensation

When a passive probe is used for the first time, you should compensate it to match the input channelof the oscilloscope. Non-compensated or poorly compensated probes may increase measurement
inaccuracy or error. The probe compensation procedures are as follows:1.

Connect the coaxial cable interface ( BNC connector ) of the passive probe to any channel of theoscilloscope.

2.

Connect the probe to the “ Compensation Signal Output Terminal ” ( Cal ) on the front of theoscilloscope. Connect the ground alligator clip of the probe to the “ Ground Terminal ” under thecompensation signal output terminal.

3.

Press theAuto Setup

button.

4.

Check the waveform displayed and compare it with the following.

SDS2000X HD Service Manual

15

5.

Under

PerfectlyOver

CompensatedCompensatedCompensated

Use a non-metallic driver to adjust the low-frequency compensation adjustment hole on the probe
until the waveform displayed is as the “ Perfectly compensated ” in the figure above.

4.1.3

Auto Setup

Press theAuto Setup

button to enable the waveform auto setting function. The oscilloscope willautomatically adjust the horizontal time base, vertical scale, and trigger mode according to the input
signal to obtain an optimum waveform display.

Auto Setup will not work on all signal types, especially time-varying bursts or slow signals ( < 20Hz ). If Auto Setup cannot achieve desired settings, you can manually adjust the vertical,
horizontal, and trigger systems.



Select the channel with the lowest frequency when several channels are connected to signals.

4.1.4

Self-Calibration

The self-calibration program can quickly calibrate the oscilloscope to reach the best working state
and the most precise measurement. It is recommended to perform a self-calibration if the change of
ambient temperature is more than 5℃. Make sure the oscilloscope has been warmed up or operated
for more than 30 minutes before the self-calibration.

Please perform the self-calibration as follows:
1.

Disconnect everything from all inputs.

2.

Operate Utility > Menu > Maintenance > Self Calibration , and the following dialog
will appear. Select Continue to start the self-calibration program.

16

SDS2000X HD Service ManualFigure 2 Calibration Interface

The oscilloscope will not respond to any operations until the self-calibration is finished. After the selfcalibration is completed, touch the screen or press any button to exit.

SDS2000X HD Service Manual

17

4.2

Interface Test

The SDS2000X HD series oscilloscope is designed with four standard interfaces: USB Host, USB
Device, LAN, and Pass/Fail. Connecting to other instruments via these interfaces enables theoscilloscope to achieve additional capabilities. To ensure the oscilloscope is operating properly, it isrecommended that the user first test the interfaces.

4.2.1

USB Host Test

To test whether the USB Host interface is operating correctly.

Tools:
A U-disk ( FAT32 format recommended )Steps:
1.

Insert a U-disk ( flash drive ) into the USB Host interface on the front panel of the oscilloscope.

2.

A message prompt “ USB flash drive detected .” appears on the screen, and an icon will beshown in the lower right corner of the screen which confirms the U-disk has been successfullyrecognized.

Figure 3 USB drive detected

18

SDS2000X HD Service Manual

4.2.2

USB Device Test

To test if the USB Device interface is operating correctly.

Tools:
A computer with a USB interface

A standard USB cable ( Type AB )

National Instruments NI-Max software

Steps:
1.

Set up National Instruments Measurement and Automation Explorer ( NI-Max ) software on acomputer and install the driver step by step following the instructions.

2.

Connect the oscilloscope to the computer using a USB cable.

3.

Run NI-MAX software. Click “ Device and Interface ” at the upper left corner of the NI softwareinterface and immediately the “ USBTMC ” device symbol is displayed.

4.

Click “ Open VISA Test Panel ” option button, and then the following Interface will appear. Next,
click the “ Input/Output ” option button and click the “ Query ” option button to view the Read
operation information.

SDS2000X HD Service Manual194.2.3

LAN Port Test

Use to test if the LAN interface operates correctly when connected with NI Visa software.

Tools:
A computer with a LAN interface

A standard LAN cable

National Instruments NI-MAX software

Steps:
1.

Set up the National Instruments Measurement and Automaton Explorer ( NI-MAX ) software on
a computer and install the driver using the following instructions.

2.

Perform Utility > I/O > LAN Config to open the LAN Config dialog box. And input usable
IP Address and Subnet Mask.

20

SDS2000X HD Service ManualFigure 4 IP Setting interface

3.

Connect the oscilloscope to the computer using a LAN cable via the LAN interface ports.

4.

Run NI-MAX software. Click “ Device and Interface ” at the upper left corner of the NI softwareinterface and select the “ LAN ” device symbol.

5.

Click “ Open VISA Test Panel ” option button, which then displays the following interface ( below ).
Then click the “ Input/Output ” option button and click the “ Query ” option button. The “ Read ”
operation information will be displayed.

SDS2000X HD Service Manual21

4.2.4

Pass/Fail out Test

To test the Mask Test function and signal output by viewing on another oscilloscope.

Tools:
A second oscilloscope

Two BNC cables

Steps:
1.

Turn on the SDS2000X HD oscilloscope.

2.

Enable Channel 1.

3.

Perform

Analysis>

Mask Test

to open the Mask Test dialog box, and touch

Mask

Setup > Create Mask to set the mask. Set the items as below:

22

SDS2000X HD Service ManualTable 1 Mask Test Settings
Parameter

Setting

Enable to Test

On

SourceCH1

Type

All in

Display InfoOn

Mask Setting
Mask X

0.32

Mask Y

0.32

Note: Press Create Mask to complete Mask setting, after mask x setting and mask y setting.

After selecting the corresponding items as shown in the table above, the screen will appear as in
Figure 5:

Figure 5 Mask Test Interface

SDS2000X HD Service Manual23All data points of the waveform must be inside the mask to pass the test. Even a single point outside
the mask will cause a failure.
1.

Connect the Pass/Fail output signal ( on the rear panel ) to the input terminal of anotheroscilloscope.

2.

Move the waveform on the screen up, down, or sideways so that any portion of it falls outside of
the Pass / Fail mask. If the interface is operating normally then a pulse will appear on the second
oscilloscope. Adjust the second oscilloscope’s time base and voltage scale as needed. If there
is no viewable pulse on the second oscilloscope then there may be a problem with this function.

Figure 6 Pulse Waveform

24

SDS2000X HD Service Manual5

Performance Test

This chapter explains testing the oscilloscope to verify performance specifications. For accurate test
results, please let the test instruments and the oscilloscope warm-up for at least 30 minutes before
testing.

Below is the required equipment for the test:
Table 2 Required test equipment
Equipment
Fluke 9500B

Description
3.2 GHz High-Performance
Oscilloscope Calibrator

Qty
1

Test item
DCG accuracy \ Offset accuracy \DC measurement accuracy \Timebase accuracy \ Trigger level \Fluke 9530

Active Head≥2

Trigger sensitivity \ BW \ BWL \Input impedance\...

The figures below show the test setups:

9500B

DUT

9530 Active Head

Figure 7 Test setup for DCG / Offset / Timebase

Note: The 9530 active head in Figure 7 is connected to any channel of the 9500B, and its BNC
connector is connected to the specified channel of the oscilloscope according to the test.

SDS2000X HD Service Manual25

9500B

DUT

9530 Active Head
9530 Active Head

Figure 8 Test setup for Channel skew

Note: The 9530 active heads in Figure 8 are connected to any two channels of the 9500B, and their
BNC connectors are connected to specified channels of the oscilloscope according to the test.

Rear panel of DUT

9500B

DUT

9530 Active Head

9530 Active Head

Figure 9 Test setup for Ext trigger level

Note: The 9530 active heads in Figure 9 are connected to any two channels of the 9500B. The BNC
connector of one active head is connected to CH1 of the oscilloscope, and the one of another active
head is connected to the external trigger of the oscilloscope.

Verify Test Results
To verify whether or not a test passes ( i.e. whether the readings are within the appropriate limits ), it
is necessary to record the readings in the Performance Test located in the Test Record.

Self-Calibration
26

SDS2000X HD Service Manual

The Self Calibration procedure is described in the section Self-Calibration. If the environmental
temperature changes by more than 5℃, the Self Calibration operation must be performed to achieve
the specified performance.

5.1

To Verify DC Gain Accuracy

To calculate the DC gain error of a vertical scale, at least nine input and reading values are required
to generate a two-dimensional array.

Use the least square method below to fit the DC Gain error:
Gain error = LINEST( Verror1:Verror9, Vsetting1:Vsetting9 )Where:
“ LINEST ” is a function in Microsoft EXCEL© that uses the “ least squares ” method to calculate
a line that best fits your dataset. It creates a two-dimensional array by using the least square
method and then returns an array describing the line. The first value of the returned array
represents the slope of the fitting line.

“ Vsetting ” represents the DC voltage output of the 9500B.

“ Vmeasure ” represents the measurement value on the oscilloscope.

“ Verror ” represents the difference between the voltage setting and the measurement value.
Table 3 Instance of Gain Error Calculation
Vsetting(mV)

Vmeasure(mV)

Verror(mV)

Point 1

-3

-3.08

-0.08

Point 2

-2.25

-2.34

-0.09

Point 3

-1.5

-1.59

-0.09

Point 4

-0.9

-0.97

-0.07

Point 5

0

-0.00

0

Point 6

0.89

0.821

-0.069Point 7

1.5

1.43

-0.07

Point 8

2.25

2.186

-0.064

Point 9

3

2.93

-0.07

SDS2000X HD Service Manual

Gain error

0.36%

27

Steps:1.

Set the 9500B output to On.

2.

Connect a selected channel of the oscilloscope to the 9500B with an active head as shown in
Figure 7.

3.

Set the oscilloscope into Non-interleaving mode (both CH1/CH2 and/or both CH3/CH4
activated). Set the timebase of the oscilloscope to 500 us/div, the “ Max Mem Depth ” in themenu of Acquire to 1M, and the impedance of the selected channel to 1 MΩ.

4.

Set the vertical scale of the selected channel to 10 V/div, the position to 0 V. Select the
Measure menu of the oscilloscope to display the “ Mean ” measurement of the selectedchannel.

5.

Set DC voltage output level of the 9500B according to Table 4, and record the “ Mean ” valueof the channel as Vmean.

6.

Calculate Verror ( Verror= Vmean – Vsetting ), and set the next output level as step 5.

7.

Calculate gain error with these 9 data points: Vsetting1~Vsetting9, Verror1~Verror9 by using the‘ LINEST ’ function. Check if the slope falls within the range shown in Table 4.

8.

Set the next vertical scale of the selected channel to the other settings in Table 4, and repeat
step 4 to step 7.

9.

After measuring all vertical scales of the selected channel in turn, turn the 9500B output to Off.

10.

Connect another channel of the oscilloscope to the 9500B with the active head. Check the otherchannels in the same way as step 4 to step 9.

11.

Set the oscilloscope into Interleaving mode (only one of CH1/CH2 and/or only one of CH3/CH4
activated). Set the impedance of the selected channel to 1MΩ, set the timebase to 100 us/div,
the “ Max Mem Depth ” to 2M, and repeat step 4 to step 10 to measure all channels of theoscilloscope in turn according to Table 4 which the vertical scale less than or equal to 1 V/div.
Table 4 DC Gain Accuracy Setting
VerticalApplicable

Scale

Impedance

10 V/div

1MΩDC voltage output levels

DC GainError Limit-37.5 V, -28.125 V, -18.75 V, -9.375 V,± 0.6%
0 V, 9.375 V, 18.75 V, 28.125 V, 37.5 V-33.375 V, -25.03125 V, -16.6875 V, -8.34375 V,
8.9 V/div

1MΩ

± 0.6%
0 V, 8.34375 V, 16.6875 V, 25.03125 V, 33.375 V

28

SDS2000X HD Service ManualVertical

Applicable

Scale

Impedance

7.1 V/div

1MΩ

DC voltage output levels

DC GainError Limit-26.625 V, -19.96875 V, -13.3125 V, -6.65625 V,± 0.6%
0 V, 6.65625 V, 13.3125 V, 19.96875 V, 26.625 V-21.375 V, -16.03125 V, -10.6875 V, -5.34375 V,
5.7 V/div

1MΩ

± 0.6%
0 V, 5.34375 V, 10.6875 V, 16.03125 V, 21.375 V

4.5 V/div

1MΩ-16.875 V, -12.65625 V, -8.4375 V, -4.21875 V,
0 V, 4.21875 V, 8.4375 V, 12.65625 V, 16.875 V± 0.6%-13.3125 V, -9.984375 V, -6.65625 V,
3.55 V/div

1MΩ-3.328125 V, 0 V, 3.328125 V,± 0.6%

6.65625 V, 9.984375 V, 13.3125 V-10.6875 V, -8.015625 V, -5.34375 V,
2.85 V/div

1MΩ-2.671875 V, 0 V, 2.671875 V,± 0.6%

5.34375 V, 8.015625 V, 10.6875 V-8.4375 V, -6.328125 V, -4.21875 V,
2.25 V/div

1MΩ-2.109375 V, 0 V, 2.109375 V,± 0.6%

4.21875 V, 6.328125 V, 8.4375 V
1.8 V/div

1MΩ-6.75 V, -5.0625 V, -3.375 V, -1.6875 V,± 0.6%
0 V, 1.6875 V, 3.375 V, 5.0625 V, 6.75 V

1.42 V/div

1MΩ-5.325 V, -3.99375 V, -2.6625 V, -1.33125 V,± 0.6%
0 V, 1.33125 V, 2.6625 V, 3.99375 V, 5.325 V

1.02 V/div

1MΩ-3.825 V, -2.86875 V, -1.9125 V, -0.95625 V,± 0.6%
0 V, 0.95625 V, 1.9125 V, 2.86875 V, 3.825 V

1.00 V/div

1MΩ-3.75 V, -2.8125 V, -1.875 V, -0.9375 V,± 0.6%
0 V, 0.9375 V, 1.875 V, 2.8125 V, 3.75 V

860 mV/div

1MΩ-3.225 V, -2.41875 V, -1.6125 V, -0.80625 V,± 0.6%
0 V, 0.80625 V, 1.6125 V, 2.41875 V, 3.225 V-2.5875 V, -1.940625 V, -1.29375 V,

690 mV/div

1MΩ

-0.646875 V, 0 V, 0.646875 V,± 0.6%

1.29375 V, 1.940625 V, 2.5875 V-2.0625 V, -1.546875 V, -1.03125 V,
550 mV/div

1MΩ

-0.515625 V, 0 V, 0.515625 V,± 0.6%

1.03125 V, 1.546875 V, 2.0625 V
SDS2000X HD Service Manual29Vertical

Applicable

Scale

Impedance

DC voltage output levels

DC GainError Limit-1631.25 mV, -1223.4375 mV, -815.625 mV,
435 mV/div

1MΩ

-407.8125 mV, 0 mV, 407.8125 mV,± 0.6%

815.625 mV, 1223.4375 mV, 1631.25 mV-1293.75 mV, -970.3125 mV, -646.875 mV,
345 mV/div

1MΩ

-323.4375 mV, 0 mV, 323.4375 mV,± 0.6%

646.875 mV, 970.3125 mV, 1293.75 mV-1031.25 mV, -773.4375 mV, -515.625 mV,
275 mV/div

1MΩ

-257.8125 mV, 0 mV, 257.8125 mV,± 0.6%

515.625 mV, 773.4375 mV, 1031.25 mV
220 mV/div

1MΩ

172 mV/div

1MΩ

-825 mV, -618.75 mV, -412.5 mV, 206.25 mV,
0 mV, 206.25 mV, 412.5 mV, 618.75 mV, 825 mV-645 mV, -483.75 mV, -322.5 mV, -161.25 mV,
0 mV, 161.25 mV, 322.5 mV, 483.75 mV, 645 mV± 0.6%± 0.6%-517.5 mV, -388.125 mV, -258.75 mV,
138 mV/div

1MΩ

-129.375 mV, 0 mV, 129.375 mV,± 0.6%

258.75 mV, 388.125 mV, 517.5 mV-382.5 mV, -286.875 mV, -191.25 mV,
102 mV/div

1MΩ

-95.625 mV, 0 mV, 95.625 mV,± 0.6%

191.25 mV, 286.875 mV, 382.5 mV
100 mV/div

1MΩ

-375 mV, -281.25 mV, -187.5 mV, -93.75 mV,
0 mV, 93.75 mV, 187.5 mV, 281.25 mV, 375 mV± 0.6%-322.5 mV, -241.875 mV, -161.25 mV,
86.0 mV/div

1MΩ

-80.625 mV, 0 mV, 80.625 mV,± 0.6%

161.25 mV, 241.875 mV, 322.5 mV-258.75 mV, -194.0625 mV, -129.375 mV,
69.0 mV/div

1MΩ

-64.6875 mV, 0 mV, 64.6875 mV,± 0.6%

129.375 mV, 194.0625 mV, 258.75 mV-202.5 mV, -151.875 mV, -101.25 mV,
54.0 mV/div

1MΩ

-50.625 mV, 0 mV, 50.625 mV,± 0.6%

101.25 mV, 151.875 mV, .202.5 mV

30

SDS2000X HD Service ManualVertical

Applicable

Scale

Impedance

DC voltage output levels

DC GainError Limit-163.125 mV, -122.34375 mV, -81.5625 mV,
43.5 mV/div

1MΩ

-40.78125 mV, 0 mV, 40.78125 mV,± 0.6%

81.5625 mV, 122.34375 mV, 163.125 mV-129.375 mV, -97.03125 mV, -64.6875 mV,
34.5 mV/div

1MΩ

-32.34375 mV, 0 mV, 32.34375 mV,± 0.6%

64.6875 mV, 97.03125 mV, 129.375 mV-103.125 mV, -77.34375 mV, -51.5625 mV,
27.5 mV/div

1MΩ

-25.78125 mV, 0 mV, 25.78125 mV,± 0.6%

51.5625 mV, 77.34375 mV, 103.125 mV
22.0 mV/div

1MΩ

17.2 mV/div

1MΩ

-82.5 mV, -61.875 mV, -41.25 mV, -20.625 mV,
0 mV, 20.625 mV, 41.25 mV, 61.875 mV, 82.5 mV-64.5 mV, -48.375 mV, -32.25 mV, -16.125 mV,
0 mV, 16.125 mV, 32.25 mV, 48.375 mV, 64.5 mV± 0.6%± 0.6%-51.75 mV, -38.8125 mV, -25.875 mV,
13.8 mV/div

1MΩ

-12.9375 mV, 0 mV, 12.9375 mV,± 0.6%

25.875 mV, 38.8125 mV, 51.75 mV-30.75 mV, -23.0625 mV, -15.375 mV,
8.20 mV/div

1MΩ-7.6875 mV, 0 mV, 7.6875 mV,± 0.6%

15.375 mV, 23.0625 mV, 30.75 mV-26.25 mV, -19.6875 mV, -13.125 mV,
7.00 mV/div

1MΩ-6.5625 mV, 0 mV, 6.5625 mV,± 0.6%

13.125 mV, 19.6875 mV, 26.25 mV-21.75 mV, -16.3125 mV, -10.875 mV,
5.80 mV/div

1MΩ

-5.4375 mV, 0 mV, 5.4375 mV,± 0.6%

10.875 mV, 16.3125 mV, 21.75 mV-13.35 mV, -10.0125 mV, -6.675 mV,
4.45 mV/div

1MΩ

-3.3375 mV, 0 mV, 3.3375 mV,± 1.5%

6.675 mV, 10.0125 mV, 13.35 mV-10.65 mV, -7.9875 mV, -5.325 mV,
3.55 mV/div

1MΩ-2.6625 mV, 0 mV, 2.6625 mV,± 1.5%

5.325 mV, 7.9875 mV, 10.65 mV

SDS2000X HD Service Manual31Vertical

Applicable

Scale

Impedance

2.80 mV/div

1MΩ

2.55 mV/div

1MΩ

1.76 mV/div

1MΩ

1.40 mV/div

1MΩ

1.00 mV/div

1MΩ

DC GainDC voltage output levels

Error Limit-8.4 mV, -6.3 mV, -4.2 mV, -2.1 mV,± 1.5%

0 mV, 2.1 mV, 4.2 mV, 6.3 mV, 8.4 mV-6.75 mV, -5.0625 mV, -3.375 mV, -1.6875 mV,
0 mV, 1.6875 mV, 3.375 mV, 5.0625 mV, 6.75 mV-5.28 mV, -3.96 mV, -2.64 mV, -1.32 mV,
0 mV, 1.32 mV, 2.64 mV, 3.96 mV, 5.28 mV-4.2 mV, -3.15 mV, -2.1 mV, -1.05 mV,± 1.5%± 1.5%± 1.5%

0 mV, 1.05 mV, 2.1 mV, 3.15 mV, 4.2 mV-3 mV, -2.25 mV, -1.5 mV, -0. 888 mV,± 1.5%
0 mV, 0. 888 mV, 1.5 mV, 2.25 mV, 3 mV

“ Vsetting ” in Table 4 is calculated in the following ways:
When the vertical scale is 1 mV/div, Vsetting is calculated to follow [ -3, -2.25, -1.5,-0.888, 0, 0.888, 1.5,
2.25, 3 ] * 1 mV.
When the vertical scale is within 1 mV to 5 mV, Vsetting is calculated to follow [ -3, -2.25, -1.5, -0.75,
0, 0.75, 1.5, 2.25, 3 ] * vertical scale.
When the vertical scale is more than 5 mV, Vsetting is calculated to follow [ -3.75, -2.8125, -1.875,-0.9375, 0, 0.9375, 1.875, 2.8125, 3.75 ] * vertical scale.

An Instance of Vsetting Calculation of 10 V/div:
Vsetting 1 = -3.75*10-37.5 V

Vsetting 2 = -2.8125*10-28.125 V

Vsetting 3 = -1.875*10-18.75 V

Vsetting 4 = -0.9375*10-9.375 V

Vsetting 5 = 0*10

0Vsetting 6 = 0.9375*10

9.375 V

Vsetting 7 = 1.875*10

18.75 V

Vsetting 8 = 2.8125*10

28.125 V

Vsetting 9 = 3.75*10

37.5 V32

SDS2000X HD Service Manual

5.2

To Verify Offset Accuracy

Two components must be verified for offset accuracy. The first part is the offset gain error relative tothe setting of an offset value ( Gain component ). The second part is the error only relative to thesetting of the vertical scale ( Full-scale component ).
Table 5 Components of Offset Accuracy

Offset accuracy

Gain Component

Full-scale Component

0.5%*offset

0.5%*full-scale +1 mV

Note: Refer to datasheet for the max offset spec at every vertical scale.

Take the setting below as an example:
The offset is 0 V, and the vertical scale is 200 mV/div.

Use the method below to calculate the offset accuracy:
Offset accuracy = 0.5%*0 V + 0.5%*200mV*8 + 1 mV = 9 mV

To calculate the offset gain error of a vertical scale ( i.e. Gain component ), at least five input andreading values are required to generate a two-dimensional array.

Use the least square method below to fit the Offset Gain error:
Offset Gain error = LINEST ( Offseterror1: Offseterror5, Offsetsetting1: Offsetsetting5 )Where:
“ LINEST ” is a function in Microsoft EXCEL© that uses the “ least squares ” method to calculate
a line that best fits your dataset. It creates a two-dimensional array by using the least square
method and then returns an array describing the line. The first value of the returned array
represents the slope of the fitting line.

“ Vsetting ” represents DC voltage output of the 9500B.

“ Offsetsetting ” represents the offset value setting on the oscilloscope.

SDS2000X HD Service Manual33“ Vmean ” represents the measurement value on the oscilloscope.

“ Offseterror ” represents the difference between Vmean and Vsetting.
Table 6 Instance of Offset Gain Error Calculation
Vsetting

Offsetsetting

Vmean

Offseterror

Offset Gain

(V)

(V)

(V)

(V)

Error

Point 1

10

-10

10.1

0.1

Point 2

5

-5

5.05

0.05

Point 3

0

0

0

0

Point 4

-5

5

-5.05

-0.05

Point 5

-10

10

-10.1

-0.1

-1%

Steps:
1.

Set the 9500B output to On.

2.

Connect a selected channel of the oscilloscope to the 9500B with an active head as shown in
Figure 7.

3.

Set the timebase of the oscilloscope to 5 ms/div, the “ Max Mem Depth ” in the menu of
Acquire to 2M, and the impedance of the selected channel to 1 MΩ.

4.

Set the vertical scale of the channel to 2 V/div. Select the Measure menu of the oscilloscope
to display the “ Mean ” measurement of the selected channel.

5.

According to Table 7, set offset of the channel to Offsetsetting, and set the 9500B output level toVsetting = - Offsetsetting, then record the “ Mean ” value of the oscilloscope as Vmean.

6.

Calculate Offseterror ( Offseterror= Vmean - Vsetting ), and set the next Offsetsetting as step 5.

7.

Calculate offset slope with these 5 data points: Vsetting1~Vsetting5, Offseterror1~Offseterror5 by using
the ‘ LINEST ’ function. Check if the slope falls within the range of slope error shown in Table 7 .

8.

Set offset of the channel to 0 V, and turn the 9500B output to Off, then record the “ Mean ” valueof the oscilloscope as Vzero. Check if the Vzero falls within the range of Full-Scale Component. Turnthe 9500B output to On for the next measurement.

9.

Set the vertical scale of the channel to the other settings in Table 7, and repeat step 5 to step 7.

10.

Turn the 9500B output to Off.

11.

Connect another channel of the oscilloscope to the 9500B with the active head. Check the otherchannels in the same way as step 4 to step 10.

34

SDS2000X HD Service ManualTable 7 Offset Accuracy

Vertical Scale

Offsetsetting

Gain

Full-scale

Component

Component

Error Limit

Error Limit（V）

2 V/div-200 V, -100 V, 0 V, 100 V, 200 V± 0.5%± 0.081500 mV/div-160 V, -80 V, 0 V, 80 V, 160 V± 0.5%± 0.021200 mV/div-80 V, -40 V, 0 V, 40 V, 80 V

± 0.5%± 0.009

50 mV/div-16 V, -8 V, 0 V, 8 V, 16 V

± 0.5%± 0.003

20 mV/div-8 V, -4 V, 0 V, 4 V, 8 V± 0.5%± 0.0018

10 mV/div-4 V, -2 V, 0 V, 2 V, 4 V± 0.5%± 0.0014

2 mV/div-1.6 V, -0.8 V, 0 V, 0.8 V, 1.6 V± 0.5%± 0.00108

SDS2000X HD Service Manual

35

5.3

To Verify DC Measurement Accuracy

Some products do not list the DC measurement accuracy in the datasheet, but it can be calculated
by combining the DC gain Accuracy and Offset Accuracy. Verifying this specification is not necessary
if the DC gain accuracy and Offset accuracy had been verified.
Table 8 DC Measurement Accuracy
DC Measurement Accuracy±(DC gain accuracy x | Vsetting + Offset setting|+Offset accuracy)

Use the method below to calculate the High/Low limiting for the DC measurement results:
Upper limit = Vsetting + (DC gain accuracy x | Vsetting + Offsetsetting| + Offset accuracy)
Lower limit = Vsetting - (DC gain accuracy x | Vsetting + Offsetsetting| + Offset accuracy)

Where:
“ Vsetting ” represents DC voltage output by the 9500B.

“ Offsetsetting ” represents the offset value setting on an oscilloscope.

Table 9 Instance of DC Measurement Limiting Calculation

Vsetting

Offsetsetting

Vmean

Lower limit

Upper limit

(V)

(V)

(V)

(V)

(V)

Setting 1

3

0

2.944

3.056

Setting 2-30-3.056-2.944

1V/div

Upper limit = 3V + (|3V + 0|*0.5% + 0V*0.5% + 1V/div*8div*0.5% + 1mV) = 3.056 V
Lower limit = 3V - (|3V + 0|*0.5% + 0V*0.5% + 1V/div*8div*0.5% + 1mV) = 2.944 V

The instance above give the DC measurement limiting with two different input and offset settings.
Here the limiting calculation with no Zero offset is not listed, because the calculation process iscomplicated. It is not recommended to verify the device with no zero offset setting ( offset ≠ 0 ).
Steps:The equipment and device configuration sequence is the same as the Offset Accuracy verification
setting.
36

SDS2000X HD Service Manual

5.4

To Verify BandwidthThis test checks the bandwidth of all the analog channels. In the test, the impedance of 9500B should
be set to be the same as analog channels.
Table 10 Vertical Scales should be verified
Impedance

Vertical Scale50Ω

10 mV/div, 100 mV/div, 200 mV/div, 500 mV/div, 1 V/div

Steps:
1.

Connect the selected channel of the oscilloscope to the 9500B via the active head, as shown in
Figure 7.

2.

Set the vertical scale of the selected channel to 10 mV/div, impedance to 50 Ω, “ Max Mem Depth ”
to 2M.

3.

Press theMeasurebutton on the front panel of the oscilloscope to display “Stdev ”

measurement of the selected channel.
4.

Set the 9500B: impedance to 50 Ω, amplitude to 60 mV, waveform to sine.

5.

Set frequency of the 9500B to the frequency in Table 11
Table 11 Frequency points in the test
Model

Impedance

Frequency Point (Hz)1M, 1.14M, 1.31M, 1.50M, 1.72M, 1.97M, 2.25M, 2.57M,
2.95M, 3.37M, 3.86M, 4.42M, 5.06M, 5.79M, 6.63M, 7.59M,
8.69M, 9.94M, 11.38M, 13.03M, 14.91M, 17.07M, 19.54M,

SDS2504X HD

50 Ω

22.36M, 25.60M, 29.30M, 33.54M, 38.39M, 43.94M, 50.30M,
57.58M,

65.90M,

75.44M,

86.35M,

98.84M,

113.14M,

129.51M, 148.24M, 169.68M, 194.23M, 222.33M, 254.49M,
291.30M, 333.44M, 381.67M, 436.88M, 500.08M, 572.42M,
655.22M, 750.00M
1M, 1.14M, 1.31M, 1.50M, 1.72M, 1.97M, 2.25M, 2.57M,
2.95M, 3.37M, 3.86M, 4.42M, 5.06M, 5.79M, 6.63M, 7.59M,
SDS2354X HD

50 Ω

8.69M, 9.94M, 11.38M, 13.03M, 14.91M, 17.07M, 19.54M,
22.36M, 25.60M, 29.30M, 33.54M, 38.39M, 43.94M, 50.30M,
57.58M,

SDS2000X HD Service Manual

65.90M,

75.44M,

86.35M,

98.84M,

113.14M,
37

129.51M, 148.24M, 169.68M, 194.23M, 222.33M, 254.49M,
291.30M, 333.44M, ,381.67M, 436.88M, 500.00M
1M, 1.14M, 1.31M, 1.50M, 1.72M, 1.97M, 2.25M, 2.57M,
2.95M, 3.37M, 3.86M, 4.42M, 5.06M, 5.79M, 6.63M, 7.59M,
8.69M, 9.94M, 11.38M, 13.03M , 14.91M, 17.07M, 19.54M,
SDS2204X HD

50 Ω

22.36M, 25.60M, 29.30M, 33.54M, 38.39M, 43.94M, 50.30M,
57.58M, 65.90M, 75.43M, 86.35M, 100.00M, 113.14M,
129.51M , 148.24M, 169.68M, 200.00M, 222.32M, 254.49M,
291.30M , 350.00M
1M, 1.14M, 1.31M, 1.50M, 1.72M, 1.97M, 2.25M, 2.57M,
2.95M, 3.37M, 3.86M, 4.42M, 5.06M, 5.79M, 6.63M, 7.59M,

SDS2104X HD

50 Ω

8.69M, 9.94M, 11.38M, 13.03M , 14.91M, 17.07M, 19.54M,
22.36M, 25.60M, 29.30M, 33.54M, 38.39M, 43.94M, 50.30M,
57.58M, 65.90M, 75.43M, 86.35M, 100.00M, 113.14M,
129.51M , 148.24M, 169.68M, 200.00M

6.

It is recommended to adjust the timebase to 1 us/div.

7.

Record the “ Stdev ” measurement of the waveform as Vstdev and the first frequency point as
reference value as Vref.

8.

Set the vertical scale of the oscilloscope channel under test to the next setting according to Table
10, and repeat step 3 to step 7. The amplitude of the 9500B output is always 6*vertical scale.

9.

Check the other channels in the same way as step 1 to step 8.

10.

Disconnect the test connection.

After the test, calculate the dB value ( regarding the amplitude at 1 MHz as 0 dB ) at every frequency
point. Check if the value is in the limited range in Table 12 Use the formula below to calculate the dBvalue:
VstdevdB value = 20 ∗ log10 Vref

38

SDS2000X HD Service ManualTable 12 Limited Range
Model

SDS2504X HD

SDS2354X HD

SDS2204X HD

SDS2104X HD

SDS2000X HD Service Manual

Impedance

50 Ω

50 Ω

50 Ω

50 Ω

Frequency Point (Hz)

Range

≤ 51M

( -0.5, 0.5 ) dB

≤ 168M( -0.8, 0.8 ) dB

≤ 334M( -1.2, 1.0 ) dB

≤ 501M( -3.0, -1.0 ) dB

≤ 750M( -65, -2.0 ) dB

≤ 36M

( -0.5, 0.5 ) dB

≤ 118M( -0.8, 0.8 ) dB

≤ 236M( -1.2, 1.0 ) dB

≤ 351M( -3.0, 1.0 ) dB

≤ 500M( -5.5, 3.0 ) dB

≤ 21M

( -0.5, 0.5 ) dB

≤ 68M

( -0.8, 0.8 ) dB

≤ 136M( -1.2, 1.0 ) dB

≤ 201M( -3.0, 1.0 ) dB

≤ 300M( -65, 3.0 ) dB

≤ 11M

( -0.5, 0.5 ) dB

≤ 34M

( -0.8, 0.8 ) dB

≤ 68M

( -1.2, 1.0 ) dB

≤ 101M( -3.0, 1.0 ) dB

≤ 200M( -65, -2.0 ) dB

39

5.5

To Verify Time Base Accuracy

This test verifies the time base accuracy of the oscilloscope.
Time Base Accuracy: |Frequency Error| < 20 Hz

Note: 20 Hz is the initial accuracy limit of measuring the 10 MHz input. If the oscilloscope has beenused for a long time ( e.g. > 1 year ), the error caused by aging should be added to this limit. Refer tothe datasheet for the aging spec.

Steps:
1.

Connect the selected channel of the oscilloscope to the 9500B, as shown in Figure 7.

2.

Set the oscilloscope vertical scale to 100 mV/div.

3.

Set the timebase of the oscilloscope to 1 ms/div.

4.

Set the Memory Depth to 2 Mpts.

5.

Set waveform of the 9500B to sine, amplitude to 600 mV, and frequency to 10 MHz.

6.

Check if the trigger ( hardware-measured ) frequency which is on the top right of the screen is in
the range of 9.999980 MHz to 10.00002 MHz.

Figure 107.
40Disconnect the test connection.
SDS2000X HD Service Manual

5.6

To Verify Trigger Level

This test checks the trigger level accuracy of the analog channels. In this test, the impedance of boththe 9500B and the oscilloscope should be set to 50 Ω.
Trigger Level Accuracy: |Error| ≤ 20 mV

Steps:
1.

Connect the selected channel of the oscilloscope to the 9500B as shown in Figure 7.

2.

Set the impedance of the 9500B to 50 Ω, frequency to 2 kHz, amplitude to 800 mV, andwaveform to sine.

3.

Set the timebase of the oscilloscope to 50 us/div.

4.

Set the impedance of the selected channel, vertical scale to 100 mV/div, trigger source to theselected channel, trigger slope to positive, and coupling mode to DC.

5.

Set the trigger level to 300 mV.

6.

Selected the Measure menu of the oscilloscope to display “ Level@x ” measurement.

7.

Record the value of “Level@x ”, calculate the level error ( error = 300 mV - Level@x ).

8.

Check if the trigger level error is in the limited range above.

9.

Set the trigger level to 0 mV and -300 mV, repeat step 6 to step 8 in turn.

10.

Set trigger slope to negative, repeat steps step 5 to step 9.

11.

Disconnect the test connection.

12.

Check the other analog channels in the same way as steps 1 to 11.

SDS2000X HD Service Manual

41

5.7

To Verify Ext Trigger Level

This test checks the trigger level accuracy of the external trigger channel. In this test, the impedanceof both the 9500B and the oscilloscope should be set to 1 MΩ.
Table 13 EXT Trigger Level Error Limit
Trigger Channel

Vertical Scale

Trigger Level Error Limited Range

EXT

150 mVAbs ( Error ) < 45 mV

EXT/5

345 mVAbs ( Error ) < 103.5 mV

Steps:
1.

Connect channel 1 and the external trigger channel of the oscilloscope to the 9500B with two
active heads, as shown in Figure 9.

2.

Set the oscilloscope timebase to 100 us/div.

3.

Set channel 1 of the oscilloscope to 150 mV/div, set the impedance of channel 1 and external
trigger to 1 MΩ, trigger source to EXT, trigger slope to positive, and coupling mode to DC.

4.

Set the impedance of the 9500B to 1 MΩ, frequency to 1 kHz, amplitude to 8*vertical scale,and waveform to sine.

5.

Set the trigger level to 450 mV.

6.

Set the Measure menu of the oscilloscope to display “ Level@x ” measurement.

7.

Record the value of “ Level@x ”, calculate the level error ( error = 450 mV - Level@x ).

8.

Check if the trigger level error is in the limited range above.

9.

Set the trigger level to 0 mV and -450 mV, and repeat step 5 to step 8 in turn.

10.

Set trigger slope to negative, repeat step 5 to step 9.

11.

Set the oscilloscope vertical scale to 345 mV/div, trigger source to EXT/5, trigger slope topositive, and coupling mode to DC.

12.

Set the impedance of the 9500B to 1 MΩ, frequency to 1 kHz, amplitude to 8* vertical scale,and waveform to sine.

13.

Set the trigger level to 1035 mV.

14.

Record the value of Level@x, calculate the level error ( error = 1035 mV - Level@x ).

15.

Check if the trigger level is in the limited range in Table 13.

42

SDS2000X HD Service Manual16.

Set the trigger level to 0mV and -1035 mV, and repeat step 13 to step 15 in turn.

17.

Set trigger slope to negative, and repeat step 13 to step 16.

18.

Disconnect the test connection.

5.8

To Verify Trigger Sensitivity

This test checks trigger sensitivity at the frequency of 10 MHz and also at the bandwidth frequency.
In the test, the impedance of 9500B should be set to 50 Ω.
Table 14 Trigger sensitivity data
Vertical Scale

Frequency

Frequency measured

100 mV/div

10 MHz≥ 9.9 MHz

100 mV/div

Bandwidth frequency≥ 99% * Bandwidth frequency

Steps:
1.

Connect the selected channel of the oscilloscope to the 9500B, as shown in Figure 7.

2.

Set the selected channel vertical scale of the oscilloscope to 100 mV/div, timebase to 50 ns/div,
and coupling mode to AC, and impedance to 50 Ω.

3.

Set the impedance of the 9500B to 50 Ω, frequency to 10 MHz, waveform to sine, and output
to 50 mV which is measured by the oscilloscope.

4.

Set trigger slope of the oscilloscope to Positive.

5.

Press the Trigger Level knob to set the level to the center of the waveform.

6.

Adjust the trigger level within the waveform range and observe the ( hardware-measured )frequency which is on the top right of the screen ( as shown in Figure 10), and check if a levelcan be found to satisfy the frequency measured in Table 14.

7.

Set the oscilloscope trigger slope to Negative, repeat steps 5 to 6.

8.

Set frequency of the 9500B to the bandwidth frequency of the oscilloscope, and adjust theoutput whose “ amplitude ” measured by the oscilloscope to 50 mV. Set the timebase of theoscilloscope to 2 ns/div, and then repeat steps 4 to 7.

9.

Check the other channels in the same way as steps 1 to 8.

10.

Disconnect the test connection.

SDS2000X HD Service Manual

43

The steps above are for testing the trigger sensitivity of the analog channels. The following steps areused to test the external trigger sensitivity.

Steps:
1.

Connect the external trigger channel of the oscilloscope to the 9500B, as shown in Figure 7.

2.

Set the impedance of the 9500B to 50 Ω, amplitude to 200 mV, frequency to 10 MHz, andwaveform to sine.

3.

Set the trigger source of the oscilloscope to EXT, trigger slope to Positive, and impedance ofthe external trigger channel to 50 Ω.

4.

Press the Trigger Level knob to set the level to the center of the waveform.

5.

Adjust the trigger level within the range of [ -100 mV, 100 mV ], observe the ( hardwaremeasured ) frequency which is on the top right of the screen ( as shown in Figure 10), andcheck if a level can be found to satisfy the frequency measured in Table 14.

6.

Set trigger slope to Negative, repeat steps 4 to 5.

7.

Set frequency of the 9500B to the 300 MHz ( bandwidth frequency of the external trigger ) andamplitude to 500 mV. Repeat steps 3 to 6. In step 5, change the trigger level range to[ -250 mV, 250 mV ].

8.

Set frequency of the 9500B to 10 MHz, amplitude to 1 V.

9.

Set the trigger source of the oscilloscope to EXT/5, trigger slope to Positive.

10.

Press the Trigger Level knob to set the level to the center of the waveform.

11.

Adjust the trigger level within the range of [ -500 mV, 500 mV ], observe the ( hardwaremeasured ) frequency which is on the top right of the screen ( as shown in Figure 10), andcheck if a level can be found to satisfy the frequency measured in Table 14.

12.

Set the trigger slope to Negative, repeat steps 10 to 11.

13.

Set the frequency of the 9500B to 300 MHz ( bandwidth frequency of the external trigger ),amplitude to 1.5 V. Repeat steps 9 to 12. In step 11, change the trigger level range to[ -750 mV, 750 mV ].

14.

44

Disconnect the test connection.

SDS2000X HD Service Manual

5.9

To Verify Channel Skew

This test checks the skew between two analog channels. In this test, the impedance of both the 9500B
and the oscilloscope should be set to 50 Ω.
Channel Skew Limit: |T@L| ≤ 100 ps

Steps:
1.

Connect two selected channels of the oscilloscope to the 9500B shown as in Figure 8.

2.

Press the ‘ Aux ’ key at the right of the ‘ OSCILLOSCOPE CALIBRATOR ’ panel of the 9500B
and select the Skew function.

3.

Set the impedance of the 9500B to 50 Ω, frequency to 1 kHz, and amplitude to 0.6 V.

4.

Set vertical scale of the selected channels to 100 mV/div, impedance to 50 Ω.

5.

Set the oscilloscope timebase to 2 ns/div, trigger source is the selected channel.

6.

Press theMeasurebutton on the front panel of the oscilloscope to display the “ Skew ”

measurement between two selected channels.
7.

Check if the result is in the limited range above.

8.

Disconnect the test connection.

9.

Check other channels in the same way as steps 1 to 8.

SDS2000X HD Service Manual

45

5.10

To Verify Input ImpedanceThis test checks the input impedance of all analog channels and the Ext trigger channel with different
coupling modes and vertical scales ( 100 mV/div, 200 mV/div, and 2 V/div ).
Table 15 Input Impedance data
ChannelCoupling and
impedance type

Range

0.1 V/div

1176000~1224000 Ω

0.2 V/div, 2 V/div

980000~1020000 Ω

AC / 1 MΩ
CH

Capacitance

Impedance Range

DC / 1 MΩ

980000~1020000 Ω

DC( AC ) / 50 Ω

49.5~50.5 Ω

1 MΩ

980000~1020000 Ω

50 Ω

49.5~50.5 Ω

14 ~ 18 pF

Ext

Steps:
1.

Connect the selected channel of the oscilloscope to the 9500B, as shown in Figure 7.

2.

Set the vertical scale of the selected channel to 100 mV/div, impedance to 1 MΩ, and coupling
mode to AC.

3.

Press the ‘ Aux ’ key at the right of the ‘ OSCILLOSCOPE CALIBRATOR ’ panel of the 9500B
and select the Load Resistance Measurement Function. Record the reading displays on thescreen of the 9500B.

4.

Set coupling mode of the channel to DC. Record the reading displays on the screen of the
9500B.

5.

Check if the impedance is within the specified range in Table 15.

6.

Test at 2 V/div and 200 mV/div, using the same procedure as steps 2 to 5.

7.

Check the other analog channels in the same way as steps 1 to 6.

8.

Press the ‘ Aux ’ key at the right of the ‘ OSCILLOSCOPE CALIBRATOR ’ panel of the 9500B
and select the Capacitance Measurement Function. Record the reading of the 9500B.

9.

Set the vertical scale of the selected channel to 100 mV/div, impedance to 1 MΩ, and coupling
mode to AC.

10.
46

Check if the capacitance is within the specified range in Table 15.
SDS2000X HD Service Manual

11.

Test at 2 V/div and 200 mV/div, using the same procedure as steps 9 to 10.

12.

Check the other analog channels in the same way as steps 8 to 11.

13.

Disconnect the test connection

When checking the EXT trigger channel, it is the same as checking analog channels. Record thereading displays on the screen of the 9500B, and check to verify it is within the specified range inTable 15.

SDS2000X HD Service Manual47

6

Disassembly ProceduresThis chapter describes how to remove major parts from the SDS2000X HD series oscilloscope.

6.1

Safety Consideration and Cautions

Only qualified personnel should perform the disassembly procedures. Disconnect the power before
you begin to remove or replace the parts. Otherwise, potential personal injuries or damages to thecomponents may occur.

WARNINGHAZARDOUS VOLTAGES
Maintenance is performed with the power supply on and without protective
covers. Only qualified personnel with proper tools and protection should
perform

maintenance.

Perform

maintenance

with

the

power

cord

disconnected whenever possible.
WARNINGAVOID ELECTRICAL SHOCK
Hazardous voltages exist on the power supply and LCD modules. To avoid
electrical shock, disconnect the power cord and wait at least three minutes forthe capacitors to discharge before you begin disassembly.

CAUTION

ESD CAUTIONElectrostatic discharge ( ESD ) sensitive devices inside. Electronic
components may be damaged without detection. Proper ESD precautions
should be taken to avoid performance degeneration or loss of functionality. At
a minimum, place the oscilloscope on a properly grounded ESD mat and wear
a properly grounded ESD strap.

CAUTIONREMOVE POWER TO AVOID DAMAGE
Remove power before you start to disassemble or replace parts. DO NOT
disassemble or replace parts with the power on. Damage to the components
may occur.

48

SDS2000X HD Service Manual

6.2

Tools Lists

Use these tools to remove or replace the modules in the oscilloscope:Multifunction screwdriver

Antistatic gloves

Custom screw hexagonal nut tool or long nose pliers

6.3

Disassembly ProceduresThis section describes how to remove the modules in the oscilloscope in detail. To install the removed
parts or replace a new part, follow the instructions in reverse order.

6.3.1

To Remove the Handle and Foot

Figure 11 To remove the handle and footSDS2000X HD Service Manual49

Steps:1.

Lift the handle and remove the two PM4*8 screws on the rear-cover of the handle. Then push
the two part of handle to different direction to remove the handle.

2.

Remove the four PWM3*8 screws from the bottom of each foot, then remove the two feet.

6.3.2 To Remove the Rear Cover

Figure 12 To remove the rear cover

Steps:
1.

Remove the six screws ( PWM3*6 ) on the rear cover.

2.

Lift the rear cover up and off carefully.

50

SDS2000X HD Service Manual

6.3.3 To Remove the Rear Metal Cover

Figure 13 To remove the rear metal cover

Steps:
1.

Remove the BNC nut on the rear metal cover.

2.

Remove the eight screws from the outside of the rear metal cover.

3.

Remove the rear metal cover.

SDS2000X HD Service Manual51

6.3.4 To Remove the Back-Chassis Module

Figure 14 To remove the back panel chassis module.

Steps:
1.

Remove the eight PM3*6 screws outside the back panel chassis.

2.

Lift the back panel chassis module slowly and unplug the connecting cables from the mainboard.

3.

Lift the back-chassis module away.

52

SDS2000X HD Service Manual

6.3.5 To Remove the Power Supply Module, Fan and I/O board

Figure 15 To remove the power supply module and fan.

Steps:
1.

Remove the four PM3*6 screws on the power supply and remove the power supply.

2.

Remove the four PB5*30 screws bottom of the fan and remove the fan.

3.

Remove the three PM3*6 screws on the I/O board remove the I/O board.

SDS2000X HD Service Manual536.3.6

To Remove Front Panel

Figure 16 To remove the mainboard and front panel

Steps:
1.

Remove the channel overlay sticker from the front panel and remove the four PM3*6 screws.

2.

Unplug the side connecting cable from the front panel.

3.

Remove the seven screws around the front chassis module.

4.

Lift the front chassis module slowly and unplug the middle connecting cable from the front panel.

5.

Remove the front panel.

54

SDS2000X HD Service Manual

6.3.7

To Remove the Probe interface board and Mainboard

Steps:
1.

Remove the one PM3*6 screws on the probe interface board, unplug the connecting cable andremove the probe interface board.

2.

Remove the four nuts from the front BNC connectors.

3.

Remove the thirteen PM3*6 screws on the mainboard and remove the mainboard.

SDS2000X HD Service Manual55

6.3.8To Remove the Rubber Keypad and Keyboard

Figure 17 To remove the rubber keypad and keyboard

Steps:
1.

Remove each front-panel knob by firmly grasping the knob ( with pliers protected by a soft clothto prevent scratches, if necessary ) and pull it away from the front panel.

2.

Remove the six PC3*6 screws on the keyboard.

3.

Remove the keyboard.

4.

Remove the rubber keypad.

This section describes how to remove the modules in the oscilloscope in detail. To install the removed
parts or replace a new part, follow the instructions in reverse order.

56

SDS2000X HD Service Manual

7

Solving General Problems

This chapter includes suggestions for solving general problems.

1.

The screen is still dark ( no display ) after power on:Check if the power button is illuminated. Orange indicates the oscilloscope is in standby
status and it needs a press to power on. White indicates that the oscilloscope is in the poweron status.



If the power button is not lit, check whether the power is correctly connected.

Check whether the fuse is burned out. If the fuse needs to be changed, please contact
SIGLENT timely and return the instrument to the factory for replacement by the maintenancepersonnel authorized by SIGLENT.



Restart the instrument after finishing the above inspections.



Go to the Troubleshooting chapter and check the power supply modules and acquisitionboard.

2.

If it still does not work correctly, please contact SIGLENT.

The screen displays only the logo. The instrument is frozen or unresponsive:

Remove all the USB devices plugged into the oscilloscope and power cycle the oscilloscopeto try again.



If not working, try to power cycle the oscilloscope and press themathbutton on the front

panel multiple times when the oscilloscope is booting up.
If not working, wait ten minutes to see if the oscilloscope can boot successfully. After the
successful boot, try to upgrade to the latest firmware to solve the problem.

Try to recover the system using a U-disk including the recovery package. Contact SIGLENT
for the recovery package and further instructions.

3.

If the display is still stuck at the logo screen, contact SIGLENT for further instructions.

The signal is sampled but no waveform of the signal is displayed:

Check whether the probe is correctly connected to the signal connecting wire.

Check whether the signal connecting wire is correctly connected to the BNC ( namely

SDS2000X HD Service Manual57channel connector ).


Check whether the probe is correctly connected to the item to be tested.

Check whether there are signals generated from the item to be tested.

Check the Trace option of the associated channel is Visible, not Hidden.



Check the acquisition is running and trigger status is Trig’d or Auto.



Check the horizontal time/division setting is reasonable and the acquisition time is shortenough for fast display.

Disconnect associated channel input and recall the default setup following the proceduresin the User Manual.

4.

5.

6.



Turn on the associated channel again and press the

If there is still no trace displayed, contact SIGLENT for further instructions.

Auto Setup

key.

The baseline trace drifts out of specification


Check that the fan is running.

Check that the vertical position setting is working.

Perform self-calibration following the procedures in the User Manual.



If self-calibration does not work, contact SIGLENT for further instructions.

There is an unexpected trace when no input is connected to channel inputPower cycle the oscilloscope.

Upgrade to the latest firmware.

Contact SIGLENT for further instructions.

The tested voltage amplitude is greater or lower than the actual value ( Note that this problem
usually occurs when the probe is used ):Check whether the attenuation coefficient of the channel complies with the attenuation ratioof the physical probe.



7.
58

Disconnect the oscilloscope from the external signal and do a self-cal.

There is a waveform display but not stable:
SDS2000X HD Service Manual

Check the trigger signal source: Check whether the source item at the trigger panel complies
with the signal channel used.



Check whether it is a " false wave ”: When the signal frequency is very large ( more than halfof the sample rate ), it is easy to appear as a " false wave " because of the violation of the
Nyquist theorem. At this point, a smaller time base should be set to make the sample rate ismore than 2 times the signal frequency.

Check the trigger type: General signals should use the “ Edge ” trigger and video signals
should use the “ Video ” trigger. Only when the proper trigger type is used, can the waveform
be displayed stably.



8.

Change the trigger holdoff setting.

No display after pressingRun / Stop:

Check the trigger mode in the trigger menu ( TRIGGER ). Set to “ Normal ” or “ Single ” andensure that the trigger level is set near the middle of the expected waveform amplitude or
set the mode to “ Auto ”.
Note: Using

9.

Auto Setup

can automatically finish the above setting.

Touch screen does not respond to touch operation:


Check whether the

Touchbutton backlight on the front panel is lighted up. If not, the touch

screen is not turned on. Press the button to enable the touch screen

10.

Restart the instrument.

The USB storage device cannot be recognized:


Check whether the USB storage device is operating correctly on another piece of equipment
or computer.



Make sure the USB interface is working normally.



Make sure that the USB storage device being used is flash storage type. This oscilloscope
does not support hardware storage types.



Make sure that the U disk system format is FAT32.



Restart the instrument and then insert the USB storage device to check it.

If the USB storage device still cannot be used normally, please contact SIGLENT.

SDS2000X HD Service Manual59

8TroubleshootingThis chapter contains information and procedures to troubleshoot general hardware failures.

8.1

Safety Consideration and Cautions

Only qualified personnel should perform troubleshooting procedures. Disconnect the power cord
whenever possible. DO NOT try to troubleshoot if visible damage is detected on the power supply
module and the acquisition board, return it to SIGLENT for further repair.

WARNINGHAZARDOUS VOLTAGES
Only qualified personnel with proper tools and protection should perform themaintenance. The equipment must be well-grounded during operation.

WARNINGAVOID ELECTRICAL SHOCK
Hazardous voltages exist on the power supply and LCD modules. To avoid
electrical shock, disconnect the power cord and wait at least three minutes forthe capacitors to discharge before you begin disassembly.

CAUTION

ESD CAUTIONElectrostatic discharge (ESD) sensitive devices inside. Electronic components
may be damaged without protection. Proper ESD precautions should be taken
to avoid performance degeneration or loss of functionality. As a minimum,
place the oscilloscope on a properly grounded ESD mat and wear a properly
grounded ESD strap.

CAUTIONREMOVE POWER SUPPLY TO AVOID DAMAGE
Remove the power supply before you start to disassemble or replace parts.
Disassembling or replacing parts with power on is not allowed. Damage to thecomponents may occur.

CAUTION

USE AN EXTERNAL FANWhen you remove the oscilloscope metal cover, always use an external fan
to provide airflow over the heat sinks and the acquisition board.

60

SDS2000X HD Service Manual8.2

Required Equipment
Table 16 Required Equipment
Equipment
Digital Multi-meter

Oscilloscope

8.3

Critical Specifications

Recommended Model

Accuracy ± 0.1%

SIGLENT SDM3065X or

10 mV resolution

Agilent 34401A

200 MHz BW
1 MΩ impedance

SIGLENT SDS1204X-E

Troubleshooting Flowchart

The following flowchart describes how to troubleshoot the oscilloscope in the most general case. This
does not guarantee a 100% recovery of all possible hardware failures. Contact SIGLENT if you cannot
solve the problem.

Begin

Test Power
Supply Module

Good?

NO

Replace Power
Supply Module

NO

Replace Main
Board

NO

Replace LCD

YESTest Main Board

Good?
YES

Test LCD

Good?
YES

End

SDS2000X HD Service Manual

61

8.4

To Check the Power Supply Module

Disconnect all the external cables and devices from the front and back panel.

Disconnect the power cord from the oscilloscope, and wait until the power button light is off.

Remove the rear plastic cover and metal cover following the instructions in the chapter
Disassembly Procedures.



Note that the power supply module is on the metal frame. It can be tested while attached to theframe.



Disconnect the low-voltage side power supply cable from the power supply module labeled CN2.



Reconnect the power cord to the receptacle of the power supply module. Be cautious whenworking near the power supply module without the protective cover, high voltage may exist on
the heat sink and other exposed conductors.



Test the power supply with a multi-meter.



If the voltage is slightly out of specification, try to adjust SVR1 on the power supply with a properly
insulated screwdriver.
Table 17 Pin assignments of connectors on board
Connector

Pin Number

Assignment

1, 2

V+

Specification
12.6 Vdc ± 0.2 Vdc (no load)
12.2 Vdc ~ 12.8Vdc (full load)

CN2
3, 4

COM

COM / GND

Figure 18 Power supply module mechanical drawing
62

SDS2000X HD Service Manual

8.5

To Check the Acquisition Board

This guide is based on the acquisition board revision C (labeled SDY8.007.278C). Future revisions
will be compatible unless described differently.

8.5.1



Acquisition Board Drawing

Most of the test points are located on the top side of the board, it is not necessary to completely
remove the board from the chassis to do the troubleshooting unless noted. It is recommended tore-assemble the power supply module to the metal frame for safety considerations. Follow the
instructions in the chapter Disassembly Procedures.



Reconnect the power cable to the acquisition board after you have confirmed that the power
supply module is in good condition.

SDS2000X HD Service Manual63Power up the acquisition board by pushing the front panel power button.

In most cases, you can hear the relays click if the acquisition board power up successfully. If you
cannot hear the click or there is no sign that the acquisition board is powering up, go to To Check
the Power Supply Module section to check the standby power and the main power.



If any power rail or the signal under test is abnormal, replace the acquisition board.

8.5.2

Check the board-level power supplies

Check the board-level power supplies. Find and measure those test points using a multi-meter.
Table 18 Voltage parameters of the board-level power supplies

64

NumberTest Points

Net Name

Specification

1

TP10

VCC12V6_A

12.2 ~ 12.8 Vdc

2

TP11

VCC12V6_B

12.2 ~ 12.8 Vdc

3

TP12

VCC3V3_PWR

3.3 ± 0.2 Vdc

4

TP17

DVCC1V0

1.0 ± 0.05 Vdc

5

TP19

DVCC1V8

1.8 ± 0.09 Vdc

6

TP21

DVCC1V5

1.5 ± 0.075 Vdc

7

TP29

DVCC2V5

2.5 ± 0.125 Vdc

8

TP30

DVCC3V3_MSO

2.85 ± 0.1 Vdc

9

TP34

DVCC5V_USB

5.0 ± 0.3 Vdc

10

TP37

DVCC3V3

3.3 ± 0.2 Vdc

11

TP14

AVCC5V_D

5.0 ± 0.3 Vdc

12

TP39

AVCC6V

6.5 ± 0.3 Vdc

13

TP42

AVCC5V

5.0 ± 0.2 Vdc

16

TP43

AVCC3V3_PLL

3.3 ± 0.2 Vdc

17

TP44

AVCC3V3

3.3 ± 0.2 Vdc

18

TP45

AVCC1V9_ADC1

1.9 ± 0.1 Vdc

19

TP46

AVCC12V

11.5 ± 0.5 Vdc

20

TP48

AVCC1V9_ADC2

1.9 ± 0.1 Vdc

21

TP49

AVCC8V

8.0 ± 0.5 Vdc

22

TP108

AVEE-6V-6.0 ± 0.2 Vdc

SDS2000X HD Service ManualFigure 19 Test points for the Acquisition board power supplies

SDS2000X HD Service Manual65Figure 20 Test points for the Acquisition board power supplies (continued)

Figure 21 Test points for the Acquisition board power supplies (continued)

66

SDS2000X HD Service ManualFigure 22 Test points for the Acquisition board power supplies (continued)

Figure 23 Test points for the Acquisition board power supplies (continued)

SDS2000X HD Service Manual678.5.3Check the clock

There are 3 clock oscillators and associated fanout buffers on board to source different circuits. Eachof them serves one or more functions. The voltage compliance of all the clocks under test is
LVCMOS33 or LVCMOS25.
Table 19 Clock parameters of the Acquisition System
Clock
Frequency

Test Point

Compliance

TP103

LVCMOS33

TP104

LVCMOS33

R772

LVCMOS33

TP105

LVCMOS25

Reference Clock for the ACQ FPGATP95

LVCMOS33

Reference Clock for the SMP CPU subsystem

TP96

LVCMOS33

Reference Clock for the USB Controller 0

TP97

LVCMOS33

Reference Clock for the USB Controller 1

TP98

LVCMOS25

Reference Clock for USB Hub

TP99

LVCMOS25

Asynchronous Clock for the ACQ FPGA

TP100

LVCMOS33

Reference Clock for the Ethernet Controller

TP101

LVCMOS33

Reference Clock for the CPLDTP102

LVCMOS25

Reference Clock for the SMP FPGA subsystem

TP13

LVCMOS25

Reference Clock to the MMB FPGA

10.0000 MHz± 2 ppm

33.3333 MHz± 25 ppm

24.0000 MHz± 25 ppm

25.0000 MHz± 25 ppm

68

Served Function
10 MHz TCXO Output
Reference Clock for the Acquisition Clock
Generator
Lock detection for the clock generator, NOT aclock. Active high.

SDS2000X HD Service ManualFigure 24 Test points for clock

Figure 25 Test points for clock (continued)

SDS2000X HD Service Manual

69

8.6


To Check the LCD
Reconnect the power cable to the acquisition board after you have confirmed that the power
supply module is in good condition.

Connect the LCD cable to the acquisition board.

Power up the acquisition board by pushing the front panel power button.

8.6.1

To Check the LCD Power Supply

Find connector J8 and measure those test points using a multi-meter.

Figure 26 Test points for the LCD power supplies

These power rails are shared with the power supply network described in the Check the board-level
power supplies section. If they are within specification without the LCD cable connected, but out ofspecification when connected, there may be something wrong with the LCD panel or driver board.
Contact SIGLENT support for further instruction.

8.6.2

To Check the LCD Signal

Find connector J8, use an oscilloscope to measure the signal using the method below. Be aware thata 200 MHz oscilloscope may not be suitable for signal quality check, but good enough for signal
presence detection.

70

SDS2000X HD Service ManualFigure 27 Test points for LCD signal

Table 20 Signal parameters of the LCD
Test Point

SignalCompliance

Description
PWM signal to control the

J8 PIN7LCD ONLVCMOS33

brightness of the LCD.
Normally HIGH.
LCD DATA signal.

J8 PIN8/10

Data 0LVDS
Always active.
LCD DATA signal.

J8 PIN11/13

Data 1

LVDS
Always active
LCD DATA signal.

J8 PIN16/18

Data 2

LVDS
Always active

J8 PIN19/21

Clock

LVDS

LCD reference clock.



If the signal is active, replace the LCD panel.



If the signal is stuck, double-check with the LCD cable disconnected. If the signal is still stuck,
replace the acquisition board. If not, replace the LCD panel or the LCDI board.

SDS2000X HD Service Manual71About SIGLENTSIGLENT is an international high-tech company, concentrating on R&D, sales,
production and services of electronic test & measurement instruments.

SIGLENT first began developing digital oscilloscopes independently in 2002.
After more than a decade of continuous development, SIGLENT has extended
its product line to include digital oscilloscopes, isolated handheld

oscilloscopes,

function/arbitrary

waveform

generators,

RF/MWsignalgenerators, spectrum analyzers, vector network analyzers, digital multimeters,
DC power supplies, electronic loads and other general purpose test
instrumentation. Since its first oscilloscope was launched in 2005, SIGLENT
has become the fastest growing manufacturer of digital oscilloscopes. We
firmly believe that today SIGLENT is the best value in electronic test &measurement.

Headquarters:
SIGLENT Technologies Co., Ltd
Add: Bldg No.4 & No.5, Antongda Industrial
Zone, 3rd Liuxian Road, Bao'an District,
Shenzhen, 518101, China
Tel: + 86 755 3688 7876
Fax: + 86 755 3359 1582
Email: sales@siglent.com
Website: int.siglent.com

North America:
SIGLENT Technologies America, Inc
6557 Cochran Rd Solon, Ohio 44139
Tel: 440-398-5800
Toll Free: 877-515-5551
Fax: 440-399-1211
Email: info@siglent.com
Website: www.siglentna.com

Follow us on
Facebook: SiglentTech

Europe:SIGLENT Technologies Germany GmbH
Add: Staetzlinger Str.

70

86165 Augsburg, Germany
Tel: +49(0)-821-666 0 111 0
Fax: +49(0)-821-666 0 111 22
Email: info-eu@siglent.com
Website: www.siglenteu.com

72

SDS2000X HD Service Manual