SDS2000X Plus Series
Digital Oscilloscope
Service Manual
SM0102XP-E01ASDS2000X Plus Series Digital Oscilloscope Service ManualContents
CONTENTS ............................................................................................................................ 2
1

2

GENERAL SAFETY SUMMARY.......................................................................................... 4
1.1

SAFETY TERMS AND SYMBOLS ........................................................................................................ 4

1.2

WORKING ENVIRONMENT ............................................................................................................... 5

1.3

COOLING REQUIREMENTS .............................................................................................................. 6

1.4

AC POWER ................................................................................................................................... 7

1.5

POWER AND GROUND CONNECTIONS ................................................................................................ 8

1.6

CALIBRATION ................................................................................................................................ 91.7

CLEANING ..................................................................................................................................... 9

1.8

ABNORMAL CONDITIONS ................................................................................................................. 9

FIRST STEPS ................................................................................................................. 11
2.1

DELIVERY CHECKLIST .................................................................................................................. 11

2.2

QUALITY ASSURANCE .................................................................................................................. 11

2.3

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

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

4

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

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

4.1.2

Probe Compensation ......................................................................................................... 16

4.1.3

Auto Setup......................................................................................................................... 17

4.1.4

Self-Calibration .................................................................................................................. 18

4.2

5

FUNCTIONAL CHECKS .................................................................................................................. 14

4.1.1

INTERFACE TEST ......................................................................................................................... 19

4.2.1

USB Host Test ................................................................................................................... 194.2.2

USB Device Test ............................................................................................................... 20

4.2.3

LAN Port Test .................................................................................................................... 22

4.2.4

Pass/Fail out Test .............................................................................................................. 24

PERFORMANCE TEST .................................................................................................... 27
5.1

TO VERIFY DC GAIN ACCURACY ................................................................................................... 31

5.2

TO VERIFY OFFSET ACCURACY ..................................................................................................... 32

5.3

TO VERIFY TIME BASE ACCURACY ................................................................................................ 34

5.4

TO VERIFY TRIGGER DELAY.......................................................................................................... 35

5.5

TO VERIFY EXT TRIGGER DELAY ................................................................................................... 36

5.6

TO VERIFY EXT TRIGGER LEVEL ................................................................................................... 37

5.7

TO VERIFY NOISE FLOOR ............................................................................................................. 39

5.8

TO VERIFY BANDWIDTH ................................................................................................................ 40

5.9

TO VERIFY BANDWIDTH LIMIT ....................................................................................................... 41

5.10

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

5.11

TO VERIFY INPUT I MPEDANCE ....................................................................................................... 45

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6

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

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

6.2

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

6.3

DISASSEMBLY PROCEDURES ........................................................................................................ 50

6.3.1

To Remove the Rear Cover and Knobs............................................................................. 50

6.3.2

To Remove the Power Supply Module and Fan ................................................................ 52

6.3.3

To Remove the Front Panel and Rubber Keypad .............................................................. 53

6.3.4

To Remove the Keyboard and Probe Interface Board ....................................................... 54

6.3.5

To Remove the Acquisition board...................................................................................... 55

6.3.6

To Remove the LCD Module and LCD Interface Board ..................................................... 56

7

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

8

TROUBLESHOOTING ..................................................................................................... 59
8.1

SAFETY CONSIDERATION AND CAUTIONS ....................................................................................... 59

8.2

REQUIRED EQUIPMENT ................................................................................................................. 60

8.3

TROUBLESHOOTING FLOWCHART .................................................................................................. 60

8.4

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

8.5

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

8.5.1
8.6

Acquisition Board SDY8.007.181C .................................................................................... 63

TO CHECK THE LCD .................................................................................................................... 67

8.6.1

To Check the LCD Power Supply ...................................................................................... 67

8.6.2

To Check the LCD Signal .................................................................................................. 68

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1

General Safety Summary

This chapter contains information and warnings that must be followed to keep
the instrument operating under the appropriate safety conditions. In addition to
the safety precautions specified in this section, you must also follow
recognized safety procedures.

1.1

Safety Terms and Symbols

When the following symbols or terms appear on the front or rear panel of the
instrument or in this manual, they indicate special care in terms of safety.
This symbol is used where caution is required. Refer to theaccompanying information or documentation 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 scope’s state switches between Operation andStandby. This switch does not disconnect the device's power supply.
To completely power off the scope, the power cord must be
unplugged from the AC socket after the oscilloscope is in thestandby state.
This symbol is used to represent an alternating current, or "AC".
CAUTION

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

WARNING

The "WARNING" symbol indicates a potential hazard. It calls
attention to a procedure, 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.

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1.2

Working Environment

This instrument is intended for indoor use and should be operated in a clean,
dry environment with an ambient temperature range of 0 °C - 40 °C.
Temperature
Operating: 0 ℃ to +40 ℃
Non-operation: -20 ℃ to +60 ℃

Humidity
Operating: 85% RH, 40 ℃, 24 hours
Non-operating: 85% RH, 65 ℃, 24 hours

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

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

WARNING: Do not operate the oscilloscope in an explosive
atmosphere or wet and damp conditions.

The design of the instrument has been verified to conform to EN 61010-1
safety standard per the following limits:Installation (overvoltage) Category: II (Mains Supply Connector)

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Degree of Pollution: IIDegree of Ingress Protection: IP20

Note:
Installation (Overvoltage) Category II refers to the local distribution level,
which applies to equipment connected to the mains supply (AC powersource).

Degree of Pollution II refers to a working environment which is dry and nonconductive pollution occurs. Occasional temporary conductivity caused bycondensation is expected.

CAUTION: Protect the display touch screen of the scope fromexcessive impact.

CAUTION: Do not exceed the maximum specified front panel terminal(CH1, CH2, CH3, CH4, EXT) voltage levels. Refer to Specifications formore details.

CAUTION: Do not connect or disconnect probes or test leads while
they are connected to a voltage source.

1.3

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 theapertures (fan holes) at each side of the scope. To ensure adequate

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ventilation it is required to leave a 15 cm (6 inch) minimum gap around thesides of the instrument.

CAUTION: Do not block the ventilation holes located on both sides ofthe scope.

CAUTION: Do not allow any foreign matter to enter the scope throughthe ventilation holes, etc.

1.4

AC Power

The instrument operates with a single-phase, 100 to 240 Vrms (+/-10%) AC
power at 50/60 Hz (+/-5%), or single-phase 100 - 120 Vrms (+/-10%) AC
power at 400 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.), the instrument can consume up to 100 W of power.

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

90 - 264 Vrms

90 - 132 Vrms

Frequency Range:

47 - 63 Hz

380 - 420 Hz

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1.5Power and ground connections

The instrument includes a grounded cord set containing a molded threeterminal polarized plug and a standard IEC320 (Type C13) connector for
making line voltage and safety ground connection. The AC inlet groundterminal is connected directly to the frame of the instrument. For adequate
protection against electrical shock hazard, 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 and certified for the country ofuse.

Warning: Electrical Shock Hazard!
Any interruption of the protective ground conductor within or outside of
the scope or disconnection of the safety ground terminal creates ahazardous situation.
Intentional interruption is prohibited.

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

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

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

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1.6

Calibration

The recommended calibration interval is one year. Calibration should be only
performed by qualified personnel.

1.7

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 topenetrate the instrument. To avoid electrical shock, unplug the power cordfrom the AC outlet before cleaning.

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

1.8

Abnormal Conditions

Only operate the instrument for the purposes specified by the manufacturer.
Do not operate the scope if there are any visible signs of damage or if it has
been subjected to severe transport stresses.

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

Proper use of the instrument requires reading and understanding all of the
instructions and labels.

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Warning: Any use of the scope 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.

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SDS2000X Plus Series Digital Oscilloscope Service Manual2
2.1First steps
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 tocontact 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) from thedate of shipment, during normal use and operation. SIGLENT can repair or
replace any product that is returned to the authorized service center during
the warranty period. We must first examine the product to make sure that thedefect 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 byany of the following:a) Attempted repairs or installations by personnel other than SIGLENT.
b) Connection to incompatible devices/incorrect connection.
c) The use of non-SIGLENT accessories or 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.

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The oscilloscope's firmware has been thoroughly tested and is presumed to
be functional. Nevertheless, it is supplied without warranty of any kindcovering detailed performance. Products not made by SIGLENT are covered
solely by the warranty of the original equipment manufacturer.

2.3

Maintenance Agreement

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

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3

Document Conventions

For convenience, text surrounded by a box border is used to represent the
button of the front panel. For example, Print represents the "Print" button on
the front panel. Italicized 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 toenter the upgrade interface:
Utility＞System Setting＞Upgrade
Press the Utility button on the front panel as step 1, click the System Setting
option on the screen as step 2, and click the Update option on the screen as
step 3 to enter the upgrade interface.

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SDS2000X Plus Series Digital Oscilloscope Service Manual4

Prepare Information

Before initiating performance verification or any adjustments, it isrecommended the user follow these procedures. The following topics are
discussed in this chapter.

How to perform functional checks



How to operate four 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 theUser Manual.

4.1

Functional Checks

The functional checks details four types of checks used to determine if theoscilloscope is operating properly.
4.1.1 Power-on Inspection
The standard power supply for the instrument is 100~240 V, 50/60 Hz, or
100~120 V, 400 Hz. Please use the power cord provided with the instrument
to connect it to AC power.

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Figure 1 Connect the power cord

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

Press the Power button located at the lower-left corner of the front panel andnote that several buttons will be lit for about 6 seconds simultaneously until
the boot screen appears. The oscilloscope will then begin to perform its
power-on tests automatically, after which the Default button can be pressed torecall the factory default settings.

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4.1.2 Probe Compensation
When a probe is used for the first time, you should compensate it to match the
input channel of the oscilloscope. Non-compensated or poorly compensatedprobe may increase measurement inaccuracy or error. The probe
compensation procedures are as follows:
1. Connect the coaxial cable interface (BNC connector) of a passive
probe to any channel of the oscilloscope.
2. Connect the probe to the “Compensation Signal Output Terminal”(Cal) on the front of the oscilloscope. Connect the ground alligator clipof the probe to the “Ground Terminal” under the compensation signal
output terminal.

3. Press the Auto Setup button.
4. Check the waveform displayed and compare it with the following.

Under
Compensated

Perfectly
CompensatedOver
Compensated

5. 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.

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4.1.3 Auto Setup
Press the Auto Setup button to enable the waveform auto setting function.
The oscilloscope will automatically adjust the horizontal time base, verticalscale, 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 (< 100 Hz). If Auto Setup cannot achieve the desired
settings, you can manually adjust the vertical, horizontal, and trigger
systems.



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

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4.1.4 Self-Calibration
The self-calibration program can quickly calibrate the oscilloscope to reachthe 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 morethan 30 minutes before running self-calibration.

Please perform the self-calibration as follows:
1. Disconnect everything from all inputs.
2. Operate Utility>Do Self Cal, and it will pop up the following dialog. SelectContinue to start the self-cal program.

Figure 2

Calibration Interface

3. The oscilloscope will not respond to any operations until the self-cal isfinished. After the self-cal is completed, touch the screen or press any
button to exit.

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4.2

Interface Test

The SDS2000X Plus series oscilloscope is designed with four standard
interfaces: USB Host, USB Device, LAN, and Pass/Fail. Connecting to other
instruments via these interfaces enables the oscilloscope 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

Steps:
1. Insert a U-disk (flash drive) into the USB Host interface on the front panelof the oscilloscope.
2. A message prompt “USB flash drive detected.” appears on the screen,
and an icon will be shown in the lower right corner of the screen which
confirms the U-disk has been successfully recognized.

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Figure 3 USB drive detected

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 the NI-Max software on a computer and install the driver step bystep 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

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SDS2000X Plus Series Digital Oscilloscope Service Manualof the NI software interface 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.

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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 NI-MAX software on a computer and install the driver using thefollowing instructions.
2. Perform Utility>System Setting>I/O Setting>LAN Config to open the LAN
Config dialog box. And input usable IP Address and Subnet Mask.

Figure 4 IP Setting interface

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1. Connect the oscilloscope to the computer using a LAN cable via the LANinterface ports.
2. Run NI-MAX software. Click “Device and Interface” at the upper left cornerof the NI software interface and select the “LAN” device symbol.

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

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4.2.4 Pass/Fail out Test
To test the Mask Test function and signal output by viewing on anotheroscilloscope.
Tools:
A second oscilloscope

Two BNC cables

Steps:
1. Turn on the SDS2000X Plus oscilloscope.
2. Enable Channel 1.
3. Perform Analysis > Mask Test to open the Mask Test dialog box, andtouch Mask Setup > Create Mask to set the mask. Set the items as below:
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 andmask y setting.

After selecting the corresponding items as shown in the table above, thescreen will appear as in Figure 5:
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Figure 5 Mask Test Interface

All data points of waveform must be inside the mask to pass the test. Even asingle point outside the mask will cause a failure.

1. Connect the Pass/Fail output signal (on the rear panel) to the input
terminal of another oscilloscope.
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 thesecond oscilloscope’s time base and voltage scale as needed. If there isno viewable pulse on the second oscilloscope then there may be a
problem with this function.

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Figure 6 Pulse Waveform

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5

Performance Test

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

Below is the required equipment for the test:
Table 2 Test equipment

Equipment

Description

Test item

Fluke 9500B + Active
Heads

High-Performance
Oscilloscope Calibrator

DCG¥Offset¥ Clockaccuracy¥Trigger delay¥BW¥BWL¥trigger
sensitivity¥ Input
impedance¥ Ext Trigger
delay¥Ext Trigger level…

GPIB Card and Cable

For communication between
the computer and the 9500B

USB Cable(or Ethernet
Cable)For communication between
the computer and the
SDS2000X Plus

BNC Cables
BNC T Connectors

BNC(m) to BNC(m),Approx.1m long
For signal distribution

DCG¥Offset

Computer

The figures below show the interconnections between the test equipment and
PC to the oscilloscope under test:

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9500B
GPIB

SDS2000X
Plus
SDS2000X-E

LAN

CH1

CH1

CH2 CH3 CH4PC
BNC CABLE

Figure 7 Connecting test instruments for DCG\Offset

9500B

LAN

GPIB

SDS2000X Plus
CH
1

CH1

CH
2

CH
3

CH
4

PC

BNC CABLE

Figure 8 Connecting test instruments for Clock\Trigger Delay

9500B

LAN

GPIB

SDS2000X Plus
CH
1

CH1

CH
2

CH
3

CH
4

PC

BNC CABLE

Figure 9 Connecting test instruments for BW\BWL\Trigger Sensitivity

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9500B

GPIB

LAN

SDS2000X Plus
CH
1

CH1

CH
2

CH CH EX
34 T

PC

BNC CABLE

Figure 10 Connecting test instruments for Input impedance

The figures below show the interconnections between the test equipment and
PC to Ext Trigger test:

9500B

GPIB

LAN

CH CH CH CH EXT
1
2
3
4

CH2

CH1

SDS2000X PlusPC
BNC CABLE

Figure 11 Connecting test instruments for Ext Trigger Delay\ Ext Trigger Level

9500B

GPIB

LAN

SDS2000X Plus
CH
1

CH1

CH
2

EXT

PC
BNC CABLE

Figure 12 Connecting test instruments for Ext Trigger Sensitivity

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

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

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5.1

To Verify DC Gain Accuracy
DC Gain Accuracy Slope = LINEST(Verror1:Verror5, VSetting1:VSetting5)
Note: “VSetting” represents the DC voltage output level setting.
“Verror” represents the difference between the output setting and themeasurement.

This test verifies non-interleaved mode DC Gain Accuracy of all channels.

Steps:
1. Set the 9500B output to on.
2. Connect all channels of the oscilloscope to the 9500B as shown in Figure7.
3. Set Volts/Div of the oscilloscope to 1 mV/div. Press the Measure buttonon the front panel of the oscilloscope to display Mean measurement.
4. Set DC voltage output level of the 9500B according to Table 3, and record
the mean value of the oscilloscope as Vmean.
5. Calculate Verror (Verror=VSetting－Vmean), and set the next output levelas step 4.
6. Make a linear regression with these 5 data points: VSetting1~VSetting5,
Verror1~Verror5. Check if the slope falls within the range shown in Table3.
7. Set the oscilloscope Volts/Div to the other settings in Table 3, and repeat
step 4 to step 6.
8. Turn the 9500B output off.
9. Disconnect the connections to all the channels.

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Table 3

DC Gain Accuracy

Volt/DivDC voltage output levels

DC Gain Accuracy error

10 V/div

30 V,15V ,0,-15 V,-30 V±3%

5 V/div

15 V, 7.5 V,0,-7.5 V,-15 V±3%

2 V/div

6 V,3 V,0,-3 V,-6 V±3%

1 V/div

3 V,1.5 V,0,-1.5 V,-3 V±3%500 mV/div

1.5 V, 0.75 V,0,-0.75 V,-1.5 V±3%200 mV/div

600 mV, 300 mV,0,-300 mV,-600 mV±3%

100 mV/div

300 mV,150 mV,0,-150 mV,-300 mV±3%

50 mV/div

150 mV,75 mV,0,-75 mV,-150 mV±3%

20 mV/div

60 mV,30 mV,0,-30 mV, -60 mV±3%

10 mV/div

30 mV,150 mV,0,-150 mV,-30 mV±3%

5 mV/div

15 mV,7.5 mV,0,-7.5 mV-15 mV±3%

2 mV/div

6 mV, 3 mV,0,-3 mV, -6 mV±3%

1 mV/div

3 mV, 1 mV,0,-1 mV, -3 mV

±3%

5.2

To Verify Offset Accuracy
OffsetAccuracy

Slope=

LINEST(Offseterror1:Offset error5,

Offset out1:Offsetout5)
Note: “Offsetout” represents DC voltage output level setting;“Offseterror” represents the difference between the output setting and themeasurement.
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SDS2000X Plus Series Digital Oscilloscope Service ManualThis test verifies the non-interleaved mode Offset Accuracy of all thechannels.

Steps:
1. Set the 9500B output to on.
2. Connect all channels of the oscilloscope to 9500B as shown in Figure 7.
3. Set the Volts/Div of the channel to 1 mV/div. Press the Measure button on
the front panel of the oscilloscope to display Mean measurement.
4. According to Table 4, set offset of the channel to -Offset, and set the
9500B output level to equal the offset, then record the mean value of theoscilloscope as Vmean. When the offset is 0, set the 9500B output to off
and record the mean value of the oscilloscope as Vzero.
5. Calculate Offseterror (Offseterror= Vmean- Offset), and adjust the 9500B
to the output level as step 4.
6. Make a linear regression with these 5 data points:
Offseterror1~Offseterror5, Offsetout1~Offsetout5. Check to verify that theslope is within the limits specified in Table 4.
7. Check to verify that abs (Vzero) in step 4 is within the limits specified inTable 4.
8. Set the oscilloscope Volts/Div to the other settings in Table 4, and repeat
steps 4 to 6.
9. Turn the 9500B output off.
10. Disconnect the connections to all the channels.

Table 4 Offset Accuracy

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SDS2000X Plus Series Digital Oscilloscope Service ManualVolt/Div

Offset

Slope
error

Zero
input(V)

10 V/div

35 V,30 V,0,-3 0V,-35 V±1.5%±1.202

5 V/div

30 V,25 V,0,-25 V,-30 V±1.5%±0.602

2 V/div

20 V,10 V,0,-10 V,-20 V±1.5%±0.242

1 V/div

10 V,5 V,0,-5 V,-10 V±1.5%±0.122500 mV/div

5 V,2.5 V,0,-2.5 V,-5 V±1.5%±0.062200 mV/div

2 V,1 V,0,-1 V,-2 V±1.5%±0.026

100 mV/div

1 V,0.5 V,0,-0.5 V,-1 V±1.5%±0.01450 mV/div

500 mV,250 mV,0,-250 mV,-500 mV±1.5%±0.00820 mV/div

200 mV,100 mV,0,-100 mV,-200 mV±1.5%±0.0044

10 mV/div

100 mV, 50 mV,0,- 50 mV,-100 mV±1.5%±0.0032

5 mV/div

50 mV,25 mV,0,-25 mV,-50 mV±1.5%±0.0026

2 mV/div

20 mV, 10 mV,0,-10 mV, -20 mV±1.5%±0.00224

1 mV/div

10 mV, 5 mV,0,-5 mV, -10 mV±1.5%±0.00224

5.3

To Verify Time Base Accuracy

This test verifies the time base accuracy of the oscilloscope. In the test, theimpedance of both the 9500B and the oscilloscope should be set to 1 MΩ.

Time Base Accuracy: Frequency Error < 10 Hz

Steps:

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1. Connect the selected channel of the oscilloscope to the 9500B.
2. Set the oscilloscope Volts/Div to 100 mV/div.
3. Set the oscilloscope Sec/Div to 50 ms/div.
4. Set the Memory Depth to 20Mpts.
5. Set waveform of the 9500B to sine, amplitude to 600 mV, and frequency
to the value (10 MHz).
6. Check if the trigger (hardware-measured) frequency which is on the top
right of the screen is in the range of 999910~1000010.
7. Disconnect the test connection.
8. To Verify Trigger Delay
9. This test checks the trigger delay of the analog channels. In this test, theimpedance of both the 9500B and the oscilloscope should be set to 50 Ω.

5.4

To Verify Trigger Delay

This test checks the trigger delay of the analog channels. In this test, theimpedance of both the 9500B and the oscilloscope should be set to 50 Ω.

Channel Trigger Delay Limit: abs(T@L) ≤ 150 ps

Steps:
1. Connect the selected channel 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 Skew function.

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3. Set the impedance of the 9500B to 50 Ω, frequency to 1 kHz, andamplitude to 0.6 V.
4. Set the oscilloscope Volts/Div to 100 mV/div.
5. Set the oscilloscope Sec/Div to 2 ns/div, trigger source is the selectedchannel.
6. Press the Measure button on the front panel of the oscilloscope to display
Time@Level measurement.
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 7.

5.5

To Verify Ext Trigger Delay

This test checks the trig delay between the external trigger channel andanalog channels. In the test, the impedance of the 9500B should be set to 50
Ω, and external channel and selected analog channel both set to 50 Ω.

CH-Ext Trigger Delay Limit: abs(Delay) ≤ 1 ns

Steps:
1. Connect selected analog channel and external channel of the oscilloscopeto the 9500B with active heads (CH1/CH2) shown as in Figure 11.
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, and36 / 70

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amplitude to 0.6 V.
4. Set the oscilloscope Volts/Div to 100 mV/div.
5. Set the oscilloscope Sec/Div to 2 ns/div.
6. Set the oscilloscope trigger source to EXT, the trigger slope to Rising, andthe trigger level to 0.
7. Press Measure button on the front panel of the oscilloscope to display
Delay measurement.
8. Check if the delay is within the limited range above (≤ 1 ns).
9. Disconnect the test connection.
10. Check the other analog channel in the same way as steps 1 to 9.

5.6

To Verify Ext Trigger Level

This test checks the trigger level accuracy of the external trigger channel. In
this test, the impedance of both the 9500B and the oscilloscope should be set
to 1 MΩ.

Table 5 EXT Trigger Level Error Limit

Trigger
ChannelVolt/div

Trigger Level Error Limited Range

EXT

150 mV

Abs(Error) < 45mV

EXT/5

435 mV

Abs(Error) < 103.5mV

Steps:
1. Connect channel 1 and external trigger channel of the oscilloscope to the

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9500B with a BNC T connector, as shown in Figure 11.
2. Set the oscilloscope Sec/Div to 50 us/div.
3. Set the oscilloscope Volts/Div to 150 mV/div, 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 2 kHz, amplitude
to 4* Volts/Div, and waveform to sine.
5. Set the trigger level to 450 mV.
6. Press the Measure button on the front panel 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 -450 mV, repeat step 5 to step 8.
10. Set trigger slope to negative, repeat step 5 to step 9.
11. Set the oscilloscope Volts/Div to 345mV/div, trigger source to EX/5, trigger
slope to positive, and coupling mode to DC.
12. Set the impedance of the 9500B to 1 MΩ, frequency to 2 kHz, amplitude
to 4* Volts/Div, and waveform to sine.
13. Set the trigger level to 1035 mV.
14. Record the value of Level@x, calculate the level error (error = 300 mV Level@x).
15. Check if the trigger level is in the limited range in Table 5.
16. Set the trigger level to 0mV and -1035 mV, repeat step 13 to step 15.
17. Set trigger slope to negative, repeat step 13 to step 16.

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18. Disconnect the test connection.

5.7

To Verify Noise Floor

This test checks the noise floor of the analog channels and varies frommodels. In this test, do not connect any testing devices to the oscilloscope.

Table 6 Noise Floor Limited Range

Volt/Div

SNR Limited
Range

Volt/Div

SNR Limited
Range

500 uV[21,70]100 mV[38,70]1 mV[22,70]200 mV[38,70]2 mV[27,70]500 mV[38,70]5 mV[31,70]1V[38,70]10 mV[35,70]2V[38,70]20 mV[38,70]5V[38,70]50 mV[38,70]10 V[38,70]

Steps:
1. Set the oscilloscope Sec/Div to 1 ms/div.
2. Set the oscilloscope Volts/Div to 500 uV/div.
3. Press the Measure button on the front panel of the oscilloscope to display
Stdev and Peak-Peak measurement.
4. Calculate SNR (SNR =20 ∗ log108∗vdiv).

2∗√2∗stdev

5. Check if the SNR and pkpk/stdev are in the limited range shown in Table
5.
6. Check the other analog channels in the same way as steps 1 to 5.
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7. Set the oscilloscope Volts/Div to the others in the table above, and repeat
steps 3 to 5.

5.8

To Verify BandwidthThis test checks the bandwidth of all analog channels. In the test, theimpedance of 9500B should be set to be the same as analog channels, 50 Ω,
and 1 MΩ. The bandwidth should be verified at each coarse Volts/DIV, except
for 1 mV/div and 2 mv/div.

Steps:
1. Connect the selected channel of the oscilloscope to the 9500B via theactive head, as shown in Figure 9.
2. Set the oscilloscope Volts/Div to 5 mV/div, the Sec/Div to 500 us/div,
impedance to 50 Ω.
3. Press the Measure button on the front panel of the oscilloscope to display
Peak-Peak measurement.
4. Set waveform of the 9500B to sine, amplitude to 30 mV, and impedance
to 50 Ω, and set the impedance of the oscilloscope channels to 50 Ω.
5. Set frequency of the 9500B to the frequency in Table 7.

Table 7 Frequency points in the test

Scope Model

Impedance

Frequency Point (Hz)SDS2504X

50 Ω

0.05M,21M,52M,74M,121M,168M,201M,234M,2
68M,301M,334M,367M,401M,434M,468M,500M,601M,801M

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1. Every time the frequency is changed, it is recommended to adjust the
Sec/Div to a proper value to display a complete waveform.
2. Record the Peak-Peak measurement of the waveform.
3. Set the oscilloscope Volts/Div to the setting choices, and repeat step 2 tostep 7. Set amplitude of the 9500B to 600 mV when testing at 100 mV/div,
and set to 1.2 V when testing at 200 mV/div.
4. Check other channels in the same way as step1 to step 8.
5. Disconnect the test connection
6. After the test, calculate the dB value at every frequent point. Check if thevalue is in the limited range in Table 8.

Table 8 Limited Range

Scope Model

SDS5054X

5.9

Impedance

50 Ω

Frequency
(Hz)

Point

Range

≤52M

(-0.5,0.5) dB≤168M(-0.8,0.8) dB≤334M(-1.2,1) dB≤501M(-2.5,1) dB≤1001M(-45,3) dB

To Verify Bandwidth Limit

This test checks the bandwidth limit of all the analog channels. The test issimilar to the bandwidth test except that the bandwidth limit is turned on. In
the test, the impedance of 9500B should be set to 50 Ω. Test the bandwidth at
100 mV/div, 200 mV/div

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Steps:
1. Connect channel 1 of the oscilloscope to the 9500B via the active head,as shown in Figure 9.
2. Set the oscilloscope Volts/Div to 100 mV/div, the Sec/Div to 50 ms/div,
and set the BW Limit button to 20 MHz.
3. Press the Measure button on the front panel of the oscilloscope to display
Peak-Peak measurement.
4. Set the amplitude of the 9500B to 600 mV, and impedance to 50 Ω, andset the impedance of the oscilloscope channels to 50 Ω.
5. Set frequency of the 9500B to the frequency in Table 9.

Table 9Frequency points in the test

Frequency Point (Hz)
1k,10k,100k,1M,10M,12M,14M,16M,18M,20M,22M,24M,26M,28M,30M

1. Every time the frequency is changed, it is recommended to adjust the
Sec/Div to a value that displays a complete waveform.
2. Record the Peak-Peak measurement value of the waveform.

Table 10 Limited Range

Scope Model

SDS2504X Plus

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Impedance

50 Ω

Frequency Point (Hz)

Range

≤12M

(-2,1.15) dB≤14M(-2.4,2) dB≤20M(-3.4,2) dB≤25M(-6,2) dB≤30M(-8,2) dB

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1. Calculate the dB value at the frequency point. If the value Check if thevalue is in the limited range.
2. Check the other channels in the same way as in step1 to step 8.
3. Disconnect the test connection.

5.10 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 11 Trigger sensitivity data

Volts/Div

Frequency

Trigger Range

100 mV/div

10 MHz9.9~10.1 MHz

100 mV/div

bandwidth

bandwidth±1%

Steps:
1. Connect the selected channel of the oscilloscope to the 9500B, as shownin Figure 9.
2. Set the oscilloscope Volts/Div to 100 mV/div, Sec/Div to 50 ns/div,
coupling mode to AC.
3. Set impedance of the 9500B to 50 Ω, frequency to 10 MHz, and amplitude
to 80 mV, and set the impedance of the oscilloscope channels to 50 Ω.
4. Set trigger slope of the oscilloscope to Positive.
5. Press Trigger Level knob to set the level to the center of the waveform.
6. Adjust the trigger level within the waveform range to achieve a stable
trigger.
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7. Record the (hardware-measured) frequency which is on the top right ofthe screen, and check that it is in the specified trigger range listed in Table
11.
8. Set the oscilloscope trigger slope to Negative, repeat steps 5 to 7.
9. Set frequency of the 9500B to the bandwidth frequency of theoscilloscope. Set Sec/Div to 2 ns/div, then repeat steps 4 to 8.
10. Check the other channels in the same way as steps 1 to 9.
11. Disconnect the test connection.

The steps above are for testing the trigger level when using the internal trigger
using the analog input channels. The following steps are used to test theexternal trigger sensitivity.

Steps:
1. Connect the external trigger channel of the oscilloscope to the 9500B, as
shown in Figure 12.
2. Set the impedance of the 9500B to 50 Ω, amplitude to 200 mV, frequency
to 10 MHz.
3. Set the trigger source of the oscilloscope to EXT, trigger slope to Positive.
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] to achieve astable waveform and then record the (hardware-measured) frequency,
located at the top right area of the screen.
6. Check if the frequency is within the specified trigger range listed in Table

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10.
7. Set trigger slope to Negative, repeat steps 4 to 6.
8. Set frequency of the 9500B to the oscilloscope’s bandwidth frequency,
amplitude to 300 mV. Repeat steps 3 to 7. In step 5, the range changes to[-150 mV, 150 mV].
9. Set frequency of the 9500B to 10 MHz, amplitude to 1 V.
10. Set the trigger source of the oscilloscope to EXT/5, trigger slope to
Positive.
11. Press the Trigger Level knob to set the level to the center of the
waveform.
12. Adjust the trigger level within the range of [-500mV, 500mV] to achieve astable waveform and then record the hardware-measured value which ison the top right of the screen.
13. Check if the frequency is within the specified range listed in Table 13.
14. Set the trigger slope to Negative, repeat steps 11 to 13.
15. Set the frequency of the 9500Bto the oscilloscope’s bandwidth frequency,
amplitude to 1.5 V. Repeat steps 11 to 14. In step 6, the range changes to[-750 mV, - 750 mV].
16. Disconnect the test connection.

5.11 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).

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Table 12 Input Impedance data

ChannelCoupling and
impedance typeAC/1 MΩ
CH

Impedance Range

0.1V/div

1176000~1224000 Ω

0.2V/div,2V/div

980000~1020000 Ω

DC/1 MΩ

980000~1020000 Ω

DC(AC)/50 Ω

49.15~50.85

1 MΩ980000~1020000 Ω

50 Ω

49.15~50.85

Ext

Steps:
1. Connect the selected channel of the oscilloscope to the 9500B, as shownin Figure 10.
2. Set the oscilloscope Volts/Div to 100 mV/div, coupling mode of thechannel 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 the screen of the 9500B.
4. Set the coupling mode of the channel to DC. Record the reading displayson the screen of the 9500B.
5. Check if the impedance is within the specified range in Table 12.
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. Disconnect the test connection

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When checking the EXT trigger channel, it is the same as checking the analog
channel. Record the reading displays on the screen of the 9500B, and check toverify it is within the specified range in Table 12.

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6

Disassembly ProceduresThis chapter describes how to remove major parts from the SDS2000X Plus
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 the components may
occur.

WARNINGHAZARDOUS VOLTAGES
Maintenance is performed with the power supply on andwithout protective covers. Only qualified personnel withproper 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 for the capacitors todischarge 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 aminimum, place the oscilloscope on a properly grounded
ESD mat and wear a properly grounded ESD strap.

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

6.2

Tools Lists

Use these tools to remove or replace the modules in the oscilloscope:Multi-function screwdriver

Antistatic gloves

Custom screw hexagonal nut tool or long nose pliers

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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 inreverse order.

6.3.1 To Remove the Rear Cover and Knobs

Figure 13 To remove the rear cover and knobs

Steps:
1. Remove each front-panel knobs by firmly grasping the knob (with pliers
protected by a soft cloth to prevent scratches, if necessary) and pull it awayfrom the front panel.
2. Remove the ten screws on the rear-cover (eight PM3*8 screws, Two KM3*6

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3. Lift the rear cover up and off carefully.

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6.3.2 To Remove the Power Supply Module and Fan

Figure 14 To remove the power supply module and Fan

Steps:
1. Remove the four PM3*6 screws outside the Power Supply Module housing .
2. Remove the Power Supply Module housing.
3. Unplug the connecting cable from the power module.
4. Remove the four screws on the power supply module.
5. Remove the power supply module.
6. Unplug the fan connecting cable from the mainboard.
7. Remove the four KM3*32 screws on the fan and remove the fan.

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6.3.3 To Remove the Front Panel and Rubber Keypad

Figure 15 To remove the front panel and rubber keypad

Steps:
1. Remove the three PM3*6 screws on the front of the panel.
2. Remove the eleven PM3*6 screws outside the rear metal module.
3. Remove the two nuts on the rear BNC connectors.
4. Remove the rear metal module.
5. Remove the eleven PB3*8 screws on the back of the panel.
6. Remove the front panel and rubber keypad.

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6.3.4 To Remove the Keyboard and Probe Interface Board

Figure 16 To remove the keyboard and probe interface board.

Steps:
1. Unplug the connecting cable from the mainboard.
2. Remove the two PM3*6 screws on the probe interface board.
3. Disconnect the cable between the probe interface board and the keyboard.
4. Remove the Probe Interface Board.
5. Remove the seven PM3*6 screws on the keyboard.
6. Remove the keyboard.

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6.3.5 To Remove the Acquisition board

Figure 17 To remove the acquisition board

Steps:
1. Remove the five BNC nuts and gaskets on the front side of the metal frame.
2. Remove the ten PM3*6 screws on the acquisition board.
3. Remove the Acquisition board.

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6.3.6 To Remove the LCD Module and LCD Interface Board

Figure 18 To remove the LCD module and LCD interface board

Steps:
1. Remove the five PM3*6 screws on the LCD module.
2. Disconnect the cable between the LCD and LCD interface board.
3. Remove the LCD module.
4. Remove the two PM3*6 screws on the LCD interface board.
5. Remove the LCD Interface board.

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7

Solving General Problems

This chapter includes suggestions for solving general problems.

If there is no display
Is the light of the power button glowing?
If yes:

Go to the Troubleshooting chapter and check the power supply
modules and acquisition board.

If no:


Check that the power cord is secured in the power receptacle.



Check that the fuse in the power receptacle is not blown out.



Check that the power source is alive.



If there is still no light glowing, go to the Troubleshooting chapter andcheck the power supply modules and acquisition board.

If the display is stuck at the logo screen

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



If not working, try to power cycle the oscilloscope and press the mathbutton on the front panel multiple times when the scope is booting up.

If not working, wait ten minutes to see if the oscilloscope can bootsuccessfully. If not, contact SIGLENT for further instructions. If it is, try
to upgrade to the latest firmware to solve the problem.

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

If there is no trace display

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SDS2000X Plus Series Digital Oscilloscope Service Manual

Check the Trace option of the associated channel is Visible, notHidden.

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



Check the horizontal time/division setting is reasonable and theacquisition time is short enough for fast display.

Disconnect associated channel input and recall the default setup
following the procedures in the User Manual.

Turn on the associated channel again and press the Auto Setup key.



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

If the baseline trace drift 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.

If there is an unexpected trace when no input connected to channel inputPower cycle the oscilloscope.

Upgrade to the latest firmware.

Contact SIGLENT for further instructions.

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8

TroubleshootingThis chapter contains information and procedures for troubleshooting 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 acquisitionboard, return it to SIGLENT for further repair.

WARNINGWARNINGCAUTIONCAUTIONCAUTION

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HAZARDOUS VOLTAGESIn case maintenance is performed with power supply on andwithout protective covers. Only qualified personnel withproper tools and protection should perform themaintenance. The equipment must be well-grounded during
operation.
AVOIDELECTRICALSHOCK
Hazardous voltages exist on the power supply and LCD
modules. To avoid electrical shock, disconnect the power
cord and wait at least three minutes for the capacitors todischarge before you begin disassembly.
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 aminimum, place the oscilloscope on a properly grounded
ESD mat and wear a properly grounded ESD strap.
REMOVE POWER SUPPLY TO AVOID DAMAGE
Remove the power supply before you start to disassembleor replace parts. Disassembling or replacing parts withpower on is not allowed. Damage to the components may
occur.
USE AN EXTERNAL FANWhen you remove the oscilloscope metal cover, always use
an external fan to provide airflow over the heat sinks and theacquisition board.

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8.2

Required Equipment
Table 13 Required Equipment

Equipment

Critical Specifications

Recommended Model

Digital Multi-meter

Accuracy ± 0.05%

SIGLENT SDM3065X

1 mV resolution

Agilent 34401A

200 MHz BW

SIGLENT SDS1204X-E

Oscilloscope

1 MΩ impedance

8.3

Troubleshooting Flowchart

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

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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

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8.4
To Check the Power Supply Module
Disconnect all the external cables and devices from the front and backpanel.



Disconnect the power cord of the oscilloscope.



Remove the rear plastic cover and metal cover following the instructions inchapter Disassembly Procedures. Note that the power supply module ison the metal frame and you do not have to remove the power supply module
to check it.

Disconnect power supply cable from the acquisition board.

Reconnect the power cord to the receptacle of the power supply module.
Be cautious when working near the power supply module without theprotective cover, high voltage may exist on the heat sink and other exposed
conductor.



Test the power supply with a multi-meter.
Table 14 Pin assignments of connectors on board

Connector

Power
SupplyPin
NumberWire Color

1, 2

Red

6.2 ~ 6.8 VDC

3Orange-8 ~ -10 VDC (Not used)

4, 5, 6

Black

COM/GND

7

Brown

Trigger Signal for AC Line

8

Blue

14 ~ 16 VDCSpecification

Figure 19 Pin definition of the power supply connector

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8.5

To Check the Acquisition Board

This guide is based on the acquisition board revision C (labeled
SDY8.007.181C). Future revision will be compatible unless described
differently.

8.5.1 Acquisition Board SDY8.007.181C
8.5.1.1

Acquisition Board Drawing

Most of the test points are located on the top side of the board, it is notnecessary to completely remove the board from the chassis to do thetroubleshooting unless noticed. It is recommended to re-assemble thepower supply module to the metal frame for safety considerations. Follow
the instructions in chapter Disassembly Procedures.



Reconnect the power cable to the acquisition board after you have

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confirmed that the power supply module is in good condition.
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 theacquisition board is powering up, go to To Check the Power Supply
Module section to check the stand-by power and the main power.



If the power or the signal under test is abnormal, replace the acquisitionboard.

8.5.1.2

Check the board-level power supplies

Check the board-level power supplies. Find and measure those test points
using a multi-meter.
Table 15 Voltage parameters of the board level power supplies

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NumberTest Points

Net Name

Specification

1

TP142

VCC3V3_PWR

3.3V𝐷𝐶 ±0.2V𝐷𝐶

2

T90

VCC15V

15V𝐷𝐶 ±1V𝐷𝐶

3

C439

VCC6V5

6.5V𝐷𝐶 ±0.3V𝐷𝐶

4TP1

VCC1V0_ZYNQ

1V𝐷𝐶 ±50mV𝐷𝐶

5TP2

VCC1V8_ZYNQ

1.8V𝐷𝐶 ±90mV𝐷𝐶

6TP3VCC1V5_ZYNQ

1.5V𝐷𝐶 ±75mV𝐷𝐶

7TP4VCC3V3_ZYNQ

3.3V𝐷𝐶 ±0.2V𝐷𝐶

8

TP143

VCC2V5_ZYNQ

2.5V𝐷𝐶 ±0.1V𝐷𝐶

9

T86

DVCC3V3

3.3V𝐷𝐶 ±0.2V𝐷𝐶

10

T93

DVCC1V2

1.2V𝐷𝐶 ±80mV𝐷𝐶

11

T94

DVCC1V5_ACQ1

1.5V𝐷𝐶 ±75mV𝐷𝐶

12

TP140

DVCC1V5_ACQ2

1.5V𝐷𝐶 ±75mV𝐷𝐶

13

T97

AVCC5V

5V𝐷𝐶 ±0.1V𝐷𝐶

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14

T95

AVCC5V_AWG

5V𝐷𝐶 ±0.1V𝐷𝐶

15

T101

AVEE-5V-5V𝐷𝐶 ±0.1V𝐷𝐶

16

TP39

VCC3V3_PLL

3.3V𝐷𝐶 ±0.2V𝐷𝐶

17

TP47

VCC3V3_CH

3.3V𝐷𝐶 ±0.2V𝐷𝐶

18

T99

AVCC1V9

1.9V𝐷𝐶 ±80mV𝐷𝐶

19

T111

VCC5V_VBUS

5V𝐷𝐶 ±0.25V𝐷𝐶

20

TP136

VCC12V5

12.5V𝐷𝐶 ±0.1V𝐷𝐶

21

TP137

VCC12V

12V𝐷𝐶 ±0.1V𝐷𝐶

22

TP138

VCC8V

8V𝐷𝐶 ±0.1V𝐷𝐶

Figure 20 Test points for the Acquisition board power supplies

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

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Figure 22 Test points for the Acquisition board power supplies (continued)

8.5.1.3

Check the clock

There are 4 clock oscillators and associated fanout buffers on board to source
different circuitries. Each of them serves one or more function. The voltage
compliance of all the clock under test is LVCMOS33.
Table 16 Clock parameters of the Acquisition System

Clock Frequency

12MHz ±50ppm

Test Point

Served Function

T79

ACQ Asynchronous Clock

T80

Reference Clock for USB Device

TP32

Reference Clock for USB Host

R545

Reference Clock for PL

R546

Reference Clock for Ethernet

R547

Reference Clock for CPLD

R548

Reference Clock for ACQ1

R549

Reference Clock for ACQ2

R550

Reference Clock for MSO

25MHz ±25ppm

33.3333MHz±25ppmTP37

Reference Clock for CPU

Reference Clock for PLL
10MHz ±5ppm

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R37

Tolerance maybe larger if the software ismalfunction.

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Figure 23 Test points for clock

8.6


To Check the LCD
Reconnect the power cable to the acquisition board after you haveconfirmed 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 J32 and measure those test points using a multi-meter.

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Figure 24 Test points for the LCD power supplies

If the power supply is out-of-specification, double-check with LCD cabledisconnected. If the power supply is still out-of-specification, replace theacquisition board. If the power supply is good when the LCD cable isdisconnected, replace the LCD panel or the LCDI board (the board between theacquisition board and the LCD panel).
8.6.2 To Check the LCD Signal
Find connector J32, use an oscilloscope to measure the signal using themethod below. Be aware that a 200 MHz oscilloscope may not be suitable forsignal quality check, but good enough for signal presence detection.

Figure 25 Test points for LCD signal
Table 17 Signal parameters of the LCD

Test Point

J32 PIN5

J32 PIN8/10

J32 PIN11/13

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SignalLCD_ONLCD_DATA0_N/P

LCD_DATA1_N/P

Compliance

Description

LVCMOS33

PWM signal to control thebrightness of the LCD.
Normally HIGH.

LVDS

LVDS

LCD DATA signal.
Always active.
LCD DATA signal.
Always active

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J32 PIN16/18

J32 PIN19/21

LCD_DATA2_N/P

LCD_CLK_N/P

LVDS

LVDS

LCD DATA signal.
Always active
LCD reference clock,typically 50MHz



If the signal is active, replace the LCD panel.



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

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