SDS5000X Series
Digital Oscilloscope
Service Manual
SM0105X-E01ASDS5000X Series Digital Oscilloscope Service ManualContents
CONTENTS .............................................................................................................................. 2
1

GENERAL SAFETY SUMMARY .............................................................................................. 4
SAFETY TERMS AND SYMBOLS ........................................................................................................ 4
WORKING ENVIRONMENT ............................................................................................................... 5
COOLING REQUIREMENTS .............................................................................................................. 7
AC POWER ................................................................................................................................... 7
POWER AND GROUND CONNECTIONS ................................................................................................ 8
CALIBRATION ................................................................................................................................ 9
CLEANING ..................................................................................................................................... 9
ABNORMAL CONDITIONS ............................................................................................................... 10

2

FIRST STEPS.................................................................................................................... 11
DELIVERY CHECKLIST .................................................................................................................. 11
QUALITY ASSURANCE .................................................................................................................. 11
MAINTENANCE AGREEMENT .......................................................................................................... 123

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

4

PREPARE INFORMATION .................................................................................................. 14
FUNCTIONAL CHECKING ............................................................................................................... 14

4.1.1

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

4.1.2

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

4.1.3

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

4.1.4

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

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

5

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............................................................................................................. 25

PERFORMANCE TEST ....................................................................................................... 28
TO VERIFY DC GAIN ACCURACY ................................................................................................... 33
TO VERIFY OFFSET ACCURACY ..................................................................................................... 35
TO VERIFY TIME BASE ACCURACY ................................................................................................ 37
TO VERIFY TRIGGER DELAY.......................................................................................................... 38
TO VERIFY EXT TRIGGER DELAY ................................................................................................... 39
TO VERIFY TRIGGER LEVEL .......................................................................................................... 40
TO VERIFY EXT TRIGGER LEVEL ................................................................................................... 41
TO VERIFY NOISE FLOOR ............................................................................................................. 43
TO VERIFY BANDWIDTH ................................................................................................................ 44
TO VERIFY BANDWIDTH LIMIT ....................................................................................................... 47

2 / 88WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual
TO VERIFY TRIGGER SENSITIVITY .................................................................................................. 49
TO VERIFY CHANNEL SKEW .......................................................................................................... 52
TO VERIFY INPUT I MPEDANCE ....................................................................................................... 53
6

DISASSEMBLY PROCEDURES............................................................................................. 55
SAFETY CONSIDERATION AND CAUTIONS ....................................................................................... 55
TOOLS LISTS ............................................................................................................................... 56
DISASSEMBLY PROCEDURES ........................................................................................................ 57

6.3.1

To Remove the Rear Cover and Knobs ............................................................................. 57

6.3.2

To Remove the Rear Metal Module ................................................................................... 58

6.3.3

To Remove the Power Supply Module and Fan ................................................................ 59

6.3.4

To Remove the Front Panel and Rubber Keypad .............................................................. 60

6.3.5

To Remove the Keyboard and Probe Interface Board ....................................................... 61

6.3.6

To Remove the Acquisition board...................................................................................... 62

6.3.7

To Remove the LCD Module and LCD Interface Board ..................................................... 63

7

SOLVING GENERAL PROBLEMS ......................................................................................... 64

8

TROUBLESHOOTING ........................................................................................................ 67
SAFETY CONSIDERATION AND CAUTIONS ....................................................................................... 67
REQUIRED EQUIPMENT ................................................................................................................. 68
TROUBLESHOOTING FLOWCHART .................................................................................................. 68
TO CHECK THE POWER SUPPLY MODULE ...................................................................................... 70
TO CHECK THE ACQUISITION BOARD ............................................................................................. 71

8.5.1

Acquisition Board SDY8.007.163 ...................................................................................... 72

8.5.2

Acquisition Board SDY8.007.140 ...................................................................................... 78

TO CHECK THE PROCESSOR BOARD .............................................................................................. 83

8.6.1

Check the processor power supplies ................................................................................. 83

8.6.2

Check the clock ................................................................................................................. 84

TO CHECK THE LCD .................................................................................................................... 85

8.7.1

To Check the LCD Power Supply ...................................................................................... 86

8.7.2

To Check the LCD Signal .................................................................................................. 86

WWW.SIGLENT.COM

3 / 88

SDS5000X Series Digital Oscilloscope Service Manual

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.

Safety Terms and Symbols

When the following symbols or terms appear on the front or rear panelof the instrument or in this manual, they indicate special care in terms ofsafety.
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 groundconnection.
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 and Standby. This switch does not disconnect thedevice's power supply. To completely power off the scope, thepower cord must be unplugged from the AC socket after theoscilloscope is in the standby state.
This symbol is used to represent an alternating current, or "AC".

4 / 88WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

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.

Working Environment

This instrument is intended for indoor use and should be operated in aclean, 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: ≤ 15,266 m

WWW.SIGLENT.COM

5 / 88

SDS5000X Series Digital Oscilloscope Service Manual

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)

Degree of Pollution: IIDegree of 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 andnon-conductive pollution occurs. Occasional temporary conductivity
caused by condensation is expected.

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

6 / 88WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

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

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

Cooling Requirements

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

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

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

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%)

WWW.SIGLENT.COM

7 / 88

SDS5000X Series Digital Oscilloscope Service Manual

AC power at 400Hz (+/-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

Power 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 cordplug 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 of use.

8 / 88WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

Warning: Electrical Shock Hazard!
Any interruption of the protective ground conductor within or
outside of the scope or disconnection of the safety groundterminal creates a hazardous 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.

Calibration

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

Cleaning

Clean only the exterior of the instrument, using a damp, soft cloth. Do
not use chemicals or abrasive elements. Under no circumstances allow

WWW.SIGLENT.COM

9 / 88

SDS5000X Series Digital Oscilloscope Service Manual

moisture to penetrate the instrument. To avoid electrical shock, 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

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.

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 orused for patient monitoring.

10 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

2First 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.

Quality Assurance

The oscilloscope has a 3-year warranty (1-year warranty for probes)
from the date 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 theproduct to make sure that the defect is caused by the process ormaterial, not by abuse, negligence, accident, abnormal conditions oroperation.

SIGLENT shall not be responsible for any defect, damage, or failurecaused by any of the following:a) Attempted repairs or installations by personnel other than
SIGLENT.
b) Connection to incompatible devices/incorrect connection.

WWW.SIGLENT.COM

11 / 88

SDS5000X Series Digital Oscilloscope Service Manualc) 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.

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

Maintenance Agreement

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

12 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope 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, Print represents the "Print"
button on the front panel. Italicized text with shading is used torepresent the touchable or clickable menu/button/region on the touch
screen. For example, DISPLAY represents the "DISPLAY" menu on thescreen:For the operations that contain multiple steps, the description is in theform of "Step 1 > Step 2 >...".As an example, follow each step in thesequence to enter 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.

WWW.SIGLENT.COM

13 / 88

SDS5000X 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, pleaserefer to the User Manual.

Functional Checking

The functional checking 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, or
100~120 V, 400 Hz. Please use the power cord provided with the

14 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

instrument to connect it to AC power.

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
and note that several buttons will be lighted for about 6 seconds
simultaneously until the boot screen appears. The oscilloscope will thenbegin to perform its power-on tests automatically, after which theDefault button can be pressed to recall the factory default settings.

WWW.SIGLENT.COM

15 / 88

SDS5000X Series Digital Oscilloscope Service Manual

4.1.2 Probe Compensation
When a probe is used for the first time, you should compensate it tomatch the input channel of the oscilloscope. Non-compensated or
poorly compensated probe may increase measurement inaccuracy orerror. 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 clip of 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

PerfectlyOver

CompensatedCompensatedCompensated

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.

16 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

4.1.3 Auto Setup
Press the Auto Setup button to enable the waveform auto setting
function. The oscilloscope will automatically adjust the horizontal timebase, vertical scale, and trigger mode according to the input signal toobtain 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
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.

WWW.SIGLENT.COM

17 / 88

SDS5000X Series Digital Oscilloscope Service Manual

4.1.4 Self-Calibration
The self-calibration program can quickly calibrate the oscilloscope toreach 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 selfcalibration.

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.
Select Continue to start the self-cal program.

Figure 2

Calibration Interface

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

18 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

Interface Test

The SDS5000X series oscilloscope is designed with four standard
interfaces: USB Host, USB Device, LAN, and Pass/Fail. Connecting toother instruments via these interfaces enables the oscilloscope toachieve additional capabilities. To ensure the oscilloscope is operating
properly, it is recommended 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
panel of the oscilloscope.
2. A message prompt “USB flash drive detected.” appears on thescreen, and an icon will be shown in the lower right corner of thescreen which confirms the U-disk has been successfully recognized.

WWW.SIGLENT.COM

19 / 88

SDS5000X Series Digital Oscilloscope Service Manual

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 stepby step following the instructions.
20 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

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 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 buttonand click the “Query” option button to view the Read operation
information.

WWW.SIGLENT.COM

21 / 88

SDS5000X Series Digital Oscilloscope Service Manual

4.2.3 LAN Port Test
Use to test if the LAN interface operates correctly when connected withNI 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 driverusing the following 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.

22 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

Figure 4 IP Setting interface

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

3. 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”

WWW.SIGLENT.COM

23 / 88

SDS5000X Series Digital Oscilloscope Service Manual

operation information will be displayed.

24 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

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 SDS5000X 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

WWW.SIGLENT.COM

25 / 88

SDS5000X Series Digital Oscilloscope Service Manual

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, thescreen will appear as in Figure 5:

Figure 5 Mask Test Interface

All data points of 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 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 isoperating normally then a pulse will appear on the second

26 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

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

WWW.SIGLENT.COM

27 / 88

SDS5000X Series Digital Oscilloscope 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 30 minutes before testing.

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

Equipment

Description

Test itemDCG\Offset\ Clockaccuracy\Trigger delay

Fluke 9500B + Active

High-Performance\BW\BWL\trigger

Heads

Oscilloscope Calibrator

sensitivity\ Input
impedance\ Ext Trigger
delay\Ext Trigger level…

GPIB Card and Cable

USB Cable(or Ethernet
Cable)BNC Cables

BNC T Connectors

For communication between
the computer and the 9500B
For communication between
the computer and the
SDS5000X
BNC(m) to BNC(m),Approx.1m long
For signal distribution

DCG\Offset

Computer

The figures below show the interconnections between the test

28 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

equipment and PC to the oscilloscope under test:

9500B
GPIB

SDS5000X
SDS2000X-E

LAN

CH1

CH1

CH2 CH3 CH4PC
BNC CABLE

Figure 7 Connecting test instruments for DCG\Offset

9500B

SDS5000X

LAN

GPIB

CH
1

CH1

CH
2

CH
3

CH
4

PC

BNC CABLE

Figure 8 Connecting test instruments for Clock\Trigger Delay\Trig Level

9500B

SDS5000X

LAN

GPIB

CH
1

CH1

CH
2

CH
3

CH
4

PC

BNC CABLE

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

WWW.SIGLENT.COM

29 / 88

SDS5000X Series Digital Oscilloscope Service Manual

9500B

GPIB

SDS5000X

LAN

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
CH1

GPIB

LAN

SDS5000X
CH CH CH CH EXT
1
2
3
4

CH2
PC
BNC CABLE

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

30 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

9500B

GPIB

SDS5000X

LAN

CH
1

CH1

CH
2

EXT

PC
BNC CABLE

Figure 12 Connecting test instruments for Ext Trigger Sensitivity

9500B
CH1

GPIB

LAN

SDS5000X
CH1 CH2 CH3 CH4CH2PC

BNC Cable

Figure 13 Connecting test instruments for Channel Skew

Verify Test Results
To verify whether or not a test passes (i.e. whether the readings arewithin the appropriate 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
the environmental temperature changes by more than 5℃, the Self

WWW.SIGLENT.COM

31 / 88

SDS5000X Series Digital Oscilloscope Service Manual

Calibration operation must be performed to achieve the specified
performance.

32 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

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 andthe measurement.

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
Figure 7.
3. Set Volts/Div of the oscilloscope to 1 mV/div. Press the Measurebutton on the front panel of the oscilloscope to display Mean
measurement.
4. Set DC voltage output level of the 9500B according to Table 3, andrecord the mean value of the oscilloscope as Vmean.
5. Calculate Verror (Verror=VSetting－Vmean), and set the next output
level as 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 Table 3.
7. Set the oscilloscope Volts/Div to the other settings in Table 3, and

WWW.SIGLENT.COM

33 / 88

SDS5000X Series Digital Oscilloscope Service Manual

repeat step 4 to step 6.
8. Turn the 9500B output off.
9. Disconnect the connections to all the channels.

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±1.5%

5 V/div

15 V, 7.5 V,0,-7.5 V,-15 V±1.5%

2 V/div

6 V,3 V,0,-3 V,-6 V±1.5%

1 V/div

3 V,1.5 V,0,-1.5 V,-3 V±1.5%

500 mV/div

1.5 V, 0.75 V,0,-0.75 V,-1.5 V±1.5%

200 mV/div

600 mV, 300 mV,0,-300 mV,-600 mV±1.5%

100 mV/div

300 mV,150 mV,0,-150 mV,-300 mV±1.5%

50 mV/div

150 mV,75 mV,0,-75 mV,-150 mV±1.5%

20 mV/div

60 mV,30 mV,0,-30 mV, -60 mV±1.5%

10 mV/div

30 mV,150 mV,0,-150 mV,-30 mV±1.5%

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%34 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

To Verify Offset Accuracy
OffsetAccuracy

Slope=

LINEST(Offseterror1:Offseterror5,

Offsetout1 :Offsetout5)
Note: “Offsetout” represents DC voltage output level setting;“Offseterror” represents the difference between the output setting
and the measurement.

This 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 Figure7.
3. Set the Volts/Div of the channel to 1 mV/div. Press the Measurebutton 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 ofthe oscilloscope 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

WWW.SIGLENT.COM

35 / 88

SDS5000X Series Digital Oscilloscope Service Manual

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 thatthe slope is within the limits specified in Table 4.
7. Check to verify that abs(Vzero) in step 4 is within the limits specified
in Table 4.
8. Set the oscilloscope Volts/Div to the other settings in Table 4, andrepeat the steps 4 to 6.
9. Turn the 9500B output off.
10. Disconnect the connections to all the channels.

Table 4 Offset Accuracy

Volt/Div

OffsetSlope 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

36 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

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

To Verify Time Base Accuracy

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

Time Base Accuracy: Frequency Error < 10 Hz

Steps:
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 12.5 Mpts.
5. Set waveform of the 9500B to sine, amplitude to 600 mV, andfrequency 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.

WWW.SIGLENT.COM

37 / 88

SDS5000X Series Digital Oscilloscope Service Manual

8. To Verify Trigger Delay
9. This test checks the trigger delay of the analog channels. In this test,
the impedance of both the 9500B and the oscilloscope should be set
to 50 Ω.

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 shownas in Figure 8.
2. Press the ‘Aux’ key at the right of the ‘OSCILLOSCOPE CALIBRATOR’
panel of the 9500B and select Skew function.
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 Measure button on the front panel of the oscilloscope to

38 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

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.

To Verify Ext Trigger Delay

This test checks the trig delay between the external channel and analog
channels. In the test, the impedance of the 9500B should be set to 50 Ωand 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 theoscilloscope to 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 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.
WWW.SIGLENT.COM

39 / 88

SDS5000X Series Digital Oscilloscope Service Manual

6. Set the oscilloscope trigger source to EXT, the trigger slope to Rising,and the trigger level to 0.
7. Press Measure button on the front panel of the oscilloscope todisplay 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.

To Verify Trigger Level

This test checks the trigger level accuracy of the ext trigger. In this test,
the impedance of both the 9500B and the oscilloscope should be set to50 Ω.

CH Trigger Level Error Limit: abs(Error) ≤ 20 mV

Steps:
1. Connect selected channel of the oscilloscope to the 9500B.
2. Set impedance of the 9500B to 50 MΩ, frequency to 2 kHz, amplitude
to 800 mV, and waveform to sine.
3. Set the oscilloscope Sec/Div to 50 us/div.
4. Set the oscilloscope Volts/Div to 100 mV/div, trigger source toselected channel, trigger slope to positive and coupling mode to DC.
40 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

5. Set the trigger level to 300 mV.
6. Press Measure button on the front panel of the oscilloscope todisplay 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 5 to step 8.
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.

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 oscilloscopeshould be set to 1 MΩ.

Table 5 EXT Trigger Level Error Limit

Trigger Channel

Volt/div

Trigger Level Error Limited Range

EXT

150 mV

Abs(Error) < 45mV

EXT/5

435mV

Abs(Error) < 103.5mV

Steps:

WWW.SIGLENT.COM

41 / 88

SDS5000X Series Digital Oscilloscope Service Manual

1. Connect channel 1 and external trigger channel of the oscilloscopeto the 9500B with a BNC T connector, as shown in Figure 11.
2. Set the oscilloscope Sec/Div to 500 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 1 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 todisplay 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 1 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.
42 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

18. Disconnect the test connection.

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 theoscilloscope.

Table 6 Noise Floor Limited Range

pkpk/stdev

SNR

pkpk/stdev

SNR

LimitedLimitedLimitedLimited

Range

Range

Range

Range

500 uV[1,15][24,55]

100 mV[1,15][38,55]

1 mV[1,15][25,55]200 mV[1,15][38,55]2 mV[1,15][27,55]500 mV[1,15][38,55]5 mV[1,15][31,55]

1V[1,15][38,55]10 mV[1,15][35,55]2V[1,15][38,55]20 mV[1,15][38,55]5V[1,15][38,55]50 mV[1,15][38,55]

10 V[1,15][38,55]Volt/Div

Volt/Div

Steps:
1. Set the oscilloscope Sec/Div to 1 ms/div.
2. Set the oscilloscope Volts/Div to 500 uV/div.

WWW.SIGLENT.COM

43 / 88

SDS5000X Series Digital Oscilloscope Service Manual

3. Press the Measure button on the front panel of the oscilloscope todisplay Stdev and Peak-Peak measurement.
4. Calculate SNR (SNR =20 ∗ log108∗vdiv), pkpk/stdev.

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.
7. Set the oscilloscope Volts/Div to the others in the table above, andrepeat the steps 3 to 5.

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 todisplay Peak-Peak measurement.
4. Set waveform of the 9500B to sine, amplitude to 30 mV, and44 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

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)SDS5104X

50 Ω

0.05M,21M,52M,74M,98M,121M,168M,201M,25
1M,301M,351M,401M,451M,501M,601M,701M,
801M, 901M, 1001M, 1002M, 1201M, 1401M,
1601M, 1801M, 2001M

SDS5054X

50 Ω

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

SDS5104X

1 MΩ

0.05M,21M,52M,74M,98M,121M,168M,201M,25
1M,301M,351M,401M,451M,484M,501M,601M

SDS5054X

1 MΩ

0.05M,21M,52M,74M,98M,121M,168M,201M,25
1M,301M,351M,401M,451M,484M,501M,601M

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 to step 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

WWW.SIGLENT.COM

45 / 88

SDS5000X Series Digital Oscilloscope Service Manual

6. After the test, calculate the dB value at every frequent point. Check if
the value is in the limited range in Table 8.

Table 8 Limited Range

Scope Model

SDS5104X

SDS5054X

SDS5104X

46 / 88

Impedance

Frequency Point (Hz)

Range

≤98M

(-0.5,0.5) dB≤301M(-0.8,0.8) dB≤601M(-1.2,1) dB≤1001M(-2.5,1) dB≤1401M(-15,3) dB≤2001M(-44,3) dB≤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≤98M(-0.8,0.5) dB≤121M(-0.8,0.8) dB≤168M(-0.8,1.3) dB≤251M(-0.5,1.9) dB≤301M(-0.8,1.3) dB≤351M(-3,0.8) dB

50 Ω

50 Ω

1 MΩ

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

SDS5054X≤401M(-6,0) dB≤601M(-6,0.98) dB≤52M(-1,0.5) dB≤168M(-2,0.8) dB≤301M(-2.5,1) dB≤384M(-3,1) dB≤501M(-5,1) dB≤1001M(-44,3) dB

1 MΩ

To Verify Bandwidth Limit

This test checks the bandwidth limit of all the analog channels. The test
is similar 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

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 todisplay Peak-Peak measurement.

WWW.SIGLENT.COM

47 / 88

SDS5000X Series Digital Oscilloscope Service Manual

4. Set the amplitude of the 9500B to 600 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 9.

Table 9 Frequency 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

SDS5104X/SDS5054

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

1. Calculate the dB value at the frequency point. If the value Check if
the value is in the limited range.

48 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

2. Check the other channels in the same way as in step1 to step 8.
3. Disconnect the test connection.

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
shown in 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, andamplitude 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

WWW.SIGLENT.COM

49 / 88

SDS5000X Series Digital Oscilloscope Service Manual

waveform.
6. Adjust the trigger level within the waveform range to achieve astable trigger.
7. Record the (hardware-measured) frequency which is on the top rightof the 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 totest the external 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 Trigger Level knob to set the level to the center of the

50 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

waveform.
5. Adjust the trigger level within the range of [-100 mV, 100 mV] toachieve a stable waveform and then record the (hardwaremeasured) frequency, located at the top right area of the screen.
6. Check if the frequency is within the specified trigger range listed inTable 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, therange 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 Trigger Level knob to set the level to the center of the
waveform.
12. Adjust the trigger level within the range of [-500mV, 500mV] toachieve a stable waveform and then record the hardware-measured
value which is on 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, therange changes to [-750 mV, - 750 mV].
16. Disconnect the test connection.

WWW.SIGLENT.COM

51 / 88

SDS5000X Series Digital Oscilloscope Service Manual

To Verify Channel Skew

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

Channel Skew Limit: abs(T@L) ≤ 150 ps

Steps:
1. Connect two selected channels of the oscilloscope to the 9500B
shown as in Figure 13.
2. Press the ‘Aux’ key at the right of the ‘OSCILLOSCOPE CALIBRATOR’
panel of the 9500B and select Skew function.
3. Set 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 todisplay Skew 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.

52 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

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 (100mV/div, 200 mV/div and 2 V/div).

Table 12 Input Impedance data

ChannelCoupling and impedance

Impedance Range

type
0.1V/div
AC/1 MΩ

0.2V/div,2V
/div

CH

1176000~1224000 Ω

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
shown in 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

WWW.SIGLENT.COM

53 / 88

SDS5000X Series Digital Oscilloscope Service Manual

Function. Record the reading displays on the screen of the 9500B.
4. Set 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

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

54 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

6

Disassembly ProceduresThis chapter describes how to remove major parts from the SDS5000X
series oscilloscope.

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 power supply on andwithout protective covers. Only qualified personnel withproper tools and protection should perform themaintenance. Perform the maintenance with the power
cord disconnected whenever possible.

WARNINGAVOID ELECTRICAL SHOCK
Hazardous voltages exist on the power supply moduleand LCD module. To avoid electrical shock, disconnect
the power cord and wait at least three minutes for the

WWW.SIGLENT.COM

55 / 88

SDS5000X Series Digital Oscilloscope Service Manual

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

performancedegeneration

or

lose

of

functionality. As 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 orreplace parts. DO NOT disassemble or replace parts
with power on is not allowed, or damage to thecomponents may occur.

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

56 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

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

6.3.1 To Remove the Rear Cover and Knobs

Figure 14 To remove the rear cover and knobs

Steps:
1. Remove each front-panel knobs by firmly grasping the knob (withpliers protected by a soft cloth to prevent scratches, if necessary) andpull it away from the front panel.
2. Remove the seven PMW3*8 screws on the rear cover.
3. Lift the rear cover up and off carefully.

WWW.SIGLENT.COM

57 / 88

SDS5000X Series Digital Oscilloscope Service Manual

6.3.2 To Remove the Rear Metal Module

Figure 15 To remove the rear metal module

Steps:
1. Remove the eight PM3*6 screws outside of the rear metal module.
2. Unplug the connecting cable from the mainboard.
3. Remove the rear metal module.

58 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

6.3.3 To Remove the Power Supply Module and Fan

Figure 16 To remove the power supply module and Fan

Steps:
1. Remove the ten PM3*6 screws outside the metal rear cover.
2. Remove the metal rear cover.
3. Unplug the connecting cable from the power module.
4. Remove the ten screws on the power supply module (Six PM3*6 screws,
four PMW3*6 screws).
5. Remove the power supply module.
6. Remove the four KM3*32 screws and nuts on the fan and remove thefan.

WWW.SIGLENT.COM

59 / 88

SDS5000X Series Digital Oscilloscope Service Manual

6.3.4 To Remove the Front Panel and Rubber Keypad

Figure 17 To remove the front panel and rubber keypad

Steps:
1. Place the oscilloscope back-side down on a soft surface such as ananti-static mat.
2. Remove the three PM3*6 screws on the front of the panel.
3. Remove the seven PB3*6 screws on the back of the panel.
4. Remove the front panel and rubber keypad.

60 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

6.3.5 To Remove the Keyboard and Probe Interface Board

Figure 18 To remove the keyboard and probe interface board.

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

WWW.SIGLENT.COM

61 / 88

SDS5000X Series Digital Oscilloscope Service Manual

6.3.6 To Remove the Acquisition board

Figure 19 To remove the acquisition board

Steps:
1. Disconnect the cable between the Acquisition board and the LCD
interface board.
2. Remove the four BNC nuts and gaskets on the front side of the metalframe.
3. Remove the ten PM3*6 screws on the acquisition board.
4. Remove the acquisition board.

62 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

6.3.7 To Remove the LCD Module and LCD Interface Board

Figure 20 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.

WWW.SIGLENT.COM

63 / 88

SDS5000X Series Digital Oscilloscope Service Manual

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
and check the power supply modules and acquisition board.

If the display is stuck at the logo screen

Remove all the USB FLASH drivers plugged into the oscilloscopeand power cycle the oscilloscope to try again.

64 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

Restart the oscilloscope and press the math button on the front
panel for multiple times when the scope is starting up.

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

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

If there is no trace display
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.

WWW.SIGLENT.COM

65 / 88

SDS5000X Series Digital Oscilloscope Service Manual

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.

66 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

8

TroubleshootingThis chapter contains information and procedures to troubleshooting
general hardware failures.

Safety Consideration and Cautions

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

WARNINGHAZARDOUS VOLTAGESIn case maintenance is performed with power supply on
and without protective covers. Only qualified personnel
with proper tools and protection should perform themaintenance. The equipment must be well-grounded
during operation.

WARNINGAVOIDELECTRICALSHOCK
Hazardous voltages exist on the power supply moduleand LCD module. To avoid electrical shock, disconnect
the power cord and wait at least three minutes for thecapacitors 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

performancedegeneration

or

loss

of

functionality. As a minimum, place the oscilloscope on
a properly grounded ESD mat and wear a properly
WWW.SIGLENT.COM

67 / 88

SDS5000X Series Digital Oscilloscope Service Manual

grounded ESD strap.
CAUTIONREMOVE POWER SUPPLY TO AVOID DAMAGE
Remove the power supply before you start todisassemble or replace parts. Disassemble or replaceparts 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 heatsinks and the acquisition board.

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 impedanceTroubleshooting Flowchart

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

68 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

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

WWW.SIGLENT.COM

69 / 88

SDS5000X Series Digital Oscilloscope Service Manual

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 in chapter Disassembly Procedures. Note that the power
supply module is on 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 and keep
the control signal cable connected.



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

Push the ON/OFF button to power on the power supply module.



Test the power supply and control bus signal listed below with a multimeter.
Table 14 Pin assignments of connectors on board

Connector

J24(Power
Supply)J22

70 / 88

Pin Number

Direction

Designation

1

Input

DC12V

2

Input

DC12V

3

Input

GND

4

Input

GND

1，5

NULL

Reserved

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual(Control Bus)

2

OutputVo sense+ (12V)3

OutputVo sense- (GND)

4

OutputEnable(3.3V/0V)

6，7

Output

GND

8

Input

Vo Standby (5V)

Figure 21 Pin definition of the power supply connector (J24)

Figure 22 Pin definition of the power control bus connector (J22)

To Check the Acquisition Board
There are two different kinds of acquisition boards for the SDS5000X
series.


SDY8.007.163: Up to 1 GHz bandwidth, for SDS5104X and SDS5054X



SDY8.007.140: Up to 500 MHz bandwidth, for SDS5034X only

WWW.SIGLENT.COM

71 / 88

SDS5000X Series Digital Oscilloscope Service Manual

8.5.1 Acquisition Board SDY8.007.163
8.5.1.1

Acquisition Board Drawing

It is recommended to remove the acquisition board from the metalframe and re-assemble the power supply module to the metal frame
for easy access to the test points and safety considerations. Follow the
instructions in chapter Disassembly Procedures.



Reconnect the power cable to the acquisition board after you haveconfirmed 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 signthat the acquisition 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 the72 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

acquisition board.

8.5.1.2

Check the Acquisition System power supplies

Check the Acquisition System power supplies. Find and measure thosetest points using a multi-meter.
12.6V

VCC12V-13V5

3v6

AVCC3V-VCC12V

AVCC-10V

AVCC19V

AVCC3V3

19V6

AVCC7V8

AVCC15V

8V4

VCC1V8_FE

VCC3V3_FE2

FAN

6V6

VCC2V5_FE

7V2

VCC3V3_FE1

AVCC5V

AVCC-5V

VTT/Vref_ddr_D

VTT/Vref_ddr_C

VTT/Vref_ddr_B

VTT/Vref_ddr_A

MGTAVCC

-6V5

1V0_B

1V0_A

1V2

1V5B

1V5A

1V8

2V5

3V3

5V

Figure 23 Acquisition Board Power Supply Distribution

WWW.SIGLENT.COM

73 / 88

SDS5000X Series Digital Oscilloscope Service Manual

Figure 24 Test points for the Acquisition board power supplies

Figure 25 Test points for the Acquisition board power supplies (continued)

74 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

Figure 26 Test points for the Acquisition board power supplies (continued)

Table 15 Voltage parameters of the Acquisition System power supplies

Number

Net Name

Test Point

Tolerance

1

VCC12V6

J24+12.6V𝐷𝐶 ± 400mV𝐷𝐶

2

VCC1V0A

C1046+1.0 V𝐷𝐶 ± 50mV𝐷𝐶

3

VCC1V0B

C1058+1.0 V𝐷𝐶 ± 50mV𝐷𝐶

4

VCC1V8TP73+1.8 V𝐷𝐶 ± 50mV𝐷𝐶

5VCC1V5A

TP75+1.5 V𝐷𝐶 ± 50mV𝐷𝐶

6

VCC1V5B

TP77+1.5 V𝐷𝐶 ± 50mV𝐷𝐶

7

VCC2V5TP83+2.5 V𝐷𝐶 ± 100mV𝐷𝐶

8

VCC3V3TP85+3.3 V𝐷𝐶 ± 100mV𝐷𝐶

9

VCC5V

TP81

+5.0 V𝐷𝐶 ± 150mV𝐷𝐶

10

VCC1V2TP79+1.3 V𝐷𝐶 ± 50mV𝐷𝐶

11

VREF_DDR_A

TP63+0.75 V𝐷𝐶 ± 22.5mV𝐷𝐶

12

VREF_DDR_B

TP65+0.75 V𝐷𝐶 ± 22.5mV𝐷𝐶

WWW.SIGLENT.COM

75 / 88

SDS5000X Series Digital Oscilloscope Service Manual

76 / 88

13

VREF_DDR_C

TP67+0.75 V𝐷𝐶 ± 22.5mV𝐷𝐶

14

VREF_DDR_D

TP69+0.75 V𝐷𝐶 ± 22.5mV𝐷𝐶

15

VTT_DDR_A

TP64+0.75 V𝐷𝐶 ± 22.5mV𝐷𝐶

16

VTT_DDR_B

TP66+0.75 V𝐷𝐶 ± 22.5mV𝐷𝐶

17

VTT_DDR_C

TP68+0.75 V𝐷𝐶 ± 22.5mV𝐷𝐶

18

VTT_DDR_D

TP70+0.75 V𝐷𝐶 ± 22.5mV𝐷𝐶

19

MGTAVCC

U84_PIN6+1.0 V𝐷𝐶 ± 30mV𝐷𝐶

20

VCC7V2

TP144+7.3 V𝐷𝐶 ± 200mV𝐷𝐶

21

VCC6V6_FE

TP145+6.6 V𝐷𝐶 ± 200mV𝐷𝐶

22

VCC3V3_FE1

TP131+3.3 V𝐷𝐶 ± 100mV𝐷𝐶

23

VCC3V3_FE2

TP132+3.3 V𝐷𝐶 ± 100mV𝐷𝐶

24

AVCC5V

TP129+5.0 V𝐷𝐶 ± 150mV𝐷𝐶

25

VCC8V4TP140+8.4 V𝐷𝐶 ± 250mV𝐷𝐶

26

VCC10V5_FE

TP138+7.8 V𝐷𝐶 ± 250mV𝐷𝐶

27

VCC19V6

TP136+19.8 V𝐷𝐶 ± 600mV𝐷𝐶

28

VCC19V_FE

TP137+19 V𝐷𝐶 ± 600mV𝐷𝐶29

VCC15VTP142+15 V𝐷𝐶 ± 450mV𝐷𝐶

30

VCC3V6TP86+3.6 V𝐷𝐶 ± 100mV𝐷𝐶

31

AVCC3V3

TP52+3.3 V𝐷𝐶 ± 100mV𝐷𝐶

32

VCC3V

TP139

+3.3 V𝐷𝐶 ± 100mV𝐷𝐶

33

-6V5

TP47

-6.5 V𝐷𝐶 ± 200mV𝐷𝐶

34

AVCC-5VTP135-5.0 V𝐷𝐶 ± 150mV𝐷𝐶

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

8.5.1.3

35

VCC-13V5

TP48-13.5 V𝐷𝐶 ± 400mV𝐷𝐶

36

VCC-10V5_FE

TP143-10.5 V𝐷𝐶 ± 300mV𝐷𝐶

37

VCC-12V_PROBUS

TP130-12 V𝐷𝐶 ± 360mV𝐷𝐶

38

VCC12V_PROBUS

TP49+12 V𝐷𝐶 ± 3600mV𝐷𝐶

39

VCC1V8_FE

TP134+1.8 V𝐷𝐶 ± 50mV𝐷𝐶

40

VCC2V5_FE

TP133+2.5 V𝐷𝐶 ± 100mV𝐷𝐶

Check the clock

Check the oscillator X2. Use an oscilloscope to measure the clock signal
using the method below.

Figure 27 Test points for clock

Table 16 Clock parameters of the Acquisition System

Test Point

Clock Domain

Level

Description

TP44

PLL Reference Clock

LVCMOS33

Typical 10 MHz

WWW.SIGLENT.COM

77 / 88

SDS5000X Series Digital Oscilloscope Service Manual

Reference Clock

TP43

LockedHigh level indicates PLL locked
LVCMOS33

Low level means PLL lock
failed

8.5.2 Acquisition Board SDY8.007.140
8.5.2.1

Acquisition Board Drawings

It is recommended that to remove the acquisition board from themetal frame and re-assemble the power supply module to the metalframe for easy access to the test points and safety considerations.
Follow the instructions in chapter Disassembly Procedures.



Reconnect the power cable to the acquisition board after you haveconfirmed 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

78 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

power up successfully. If you cannot hear the click or there is no signthat the acquisition 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 theacquisition board.

8.5.2.2

Check the Acquisition System power supply

Check the Acquisition System power supplies. Find and measure thosetest points using a multi-meter.
12.6V

AVCC5V_CH

AVCC3V3

FAN

12V

AVCC5V

8V

5V5

VCC3V3_CH

AVCC15V

AVCC-5V

VTT/Vref_ddr_D

VTT/Vref_ddr_C

VTT/Vref_ddr_B

VTT/Vref_ddr_A

MGTAVCC

VCC16V

6V5E

1V0_B

1V0_A

1V2

1V5B

1V5A

1V8

2V5

3V3

5V

Figure 28 Acquisition Board Power Supply Distribution

WWW.SIGLENT.COM

79 / 88

SDS5000X Series Digital Oscilloscope Service Manual

Figure 29 Test points for the Acquisition board power supplies

Figure 30 Test points for the Acquisition board power supplies (continued)

80 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

Figure 31 Test points for the Acquisition board power supplies (continued)

Table 17 Voltage parameters of the Acquisition System power supplies

Number

Net Name

Test Point

Tolerance

1

VCC12V6

J24+12.6V𝐷𝐶 ± 400mV𝐷𝐶

2

VCC1V0A

C1046+1.0 V𝐷𝐶 ± 50mV𝐷𝐶

3

VCC1V0B

C1058+1.0 V𝐷𝐶 ± 50mV𝐷𝐶

4

VCC1V8TP73+1.8 V𝐷𝐶 ± 50mV𝐷𝐶

5VCC1V5A

TP75+1.5 V𝐷𝐶 ± 50mV𝐷𝐶

6

VCC1V5B

TP77+1.5 V𝐷𝐶 ± 50mV𝐷𝐶

7

VCC2V5TP83+2.5 V𝐷𝐶 ± 100mV𝐷𝐶

8

VCC3V3TP85+3.3 V𝐷𝐶 ± 100mV𝐷𝐶

9

VCC5V

TP81

+5.0 V𝐷𝐶 ± 150mV𝐷𝐶

10

VCC1V2TP79+1.3 V𝐷𝐶 ± 50mV𝐷𝐶

11

VREF_DDR_A

TP63+0.75 V𝐷𝐶 ± 22.5mV𝐷𝐶

12

VREF_DDR_B

TP65+0.75 V𝐷𝐶 ± 22.5mV𝐷𝐶

WWW.SIGLENT.COM

81 / 88

SDS5000X Series Digital Oscilloscope Service Manual

8.5.2.3

13

VREF_DDR_C

TP67+0.75 V𝐷𝐶 ± 22.5mV𝐷𝐶

14

VREF_DDR_D

TP69+0.75 V𝐷𝐶 ± 22.5mV𝐷𝐶

15

VTT_DDR_A

TP64+0.75 V𝐷𝐶 ± 22.5mV𝐷𝐶

16

VTT_DDR_B

TP66+0.75 V𝐷𝐶 ± 22.5mV𝐷𝐶

17

VTT_DDR_C

TP68+0.75 V𝐷𝐶 ± 22.5mV𝐷𝐶

18

VTT_DDR_D

TP70+0.75 V𝐷𝐶 ± 22.5mV𝐷𝐶

19

MGTAVCC

U84_PIN6+1.0 V𝐷𝐶 ± 30mV𝐷𝐶

20

AVCC3V3

TP52+3.3 V𝐷𝐶 ± 100mV𝐷𝐶

21

VCC5V5TP60+5.5 V𝐷𝐶 ± 150mV𝐷𝐶

22

AVCC5VTP51+5.0 V𝐷𝐶 ± 150mV𝐷𝐶

23

AVCC5VCH

TP49+5.0 V𝐷𝐶 ± 150mV𝐷𝐶

24

VCC8V

TP50

+10.0 V𝐷𝐶 ± 300mV𝐷𝐶

25

VCC12V

TP48+12 V𝐷𝐶 ± 360mV𝐷𝐶

26

VCC3V3CH

TP53+3.3 V𝐷𝐶 ± 100mV𝐷𝐶

27

-6V5

TP47

-6.5 V𝐷𝐶 ± 100mV𝐷𝐶

28

AVCC-5VTP46-5 V𝐷𝐶 ± 150mV𝐷𝐶

29

VCC16V

C1182+16 V𝐷𝐶 ± 500mV𝐷𝐶30

VCC15VTP71+15 V𝐷𝐶 ± 450mV𝐷𝐶

31

VSRARTU71_pin3+5.0 V𝐷𝐶 ± 150mV𝐷𝐶

32

VSTART_3V3

U71_pin2+3.3 V𝐷𝐶 ± 100mV𝐷𝐶

Check the clock

Check the oscillator X2. Use an oscilloscope to measure the clock signal
82 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

using the method below.

Figure 32 Test points for clock

Table 18 Clock parameters of the Acquisition System

Test Point

Clock Domain

Level

Description

TP44

PLL Reference Clock

LVCMOS33

Typical 10 MHz

TP43

Reference Clock
LockedHigh level indicates PLL locked
LVCMOS33

Low level means PLL lock
failedTo Check the Processor Board
The processer board is mounted on the acquisition board as a daughter
card.

8.6.1 Check the processor power supplies
Check the power rails. Find and measure those test points using a multimeter.

WWW.SIGLENT.COM

83 / 88

SDS5000X Series Digital Oscilloscope Service Manual

Figure 33 Test points for the processor power supplies
Table 19 Voltage parameters of the processor power supplies

Net Name

Test Point

Tolerance

DVCC1V0_ZYNQ

TP1+1.0 V𝐷𝐶 ± 50mV𝐷𝐶

DVCC1V8_ZYNQ

TP2+1.8 V𝐷𝐶 ± 50mV𝐷𝐶

DVCC1V5_ZYNQ

TP3+1.5 V𝐷𝐶 ± 50mV𝐷𝐶

DVCC3V3_ZYNQ

TP4+3.3 V𝐷𝐶 ± 100mV𝐷𝐶

DVCC2V5_ZYNQ

C129+2.5 V𝐷𝐶 ± 100mV𝐷𝐶

8.6.2 Check the clock
Check the three oscillators X1, X2, and X3. Use an oscilloscope to measure
the clock signal using the method below.

84 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

Figure 34 Test points for clock

Table 20 Clock parameters of the Processor System

Test Point

Clock Domain

Level

Frequency Tolerance

R65

Processor Reference

LVCMOS33

33.333333 MHz ± 50PPM

R66

USB Host Reference

LVCMOS33

24.000000 MHz ± 50PPM

R67

USB Device Reference

LVCMOS33

24.000000 MHz ± 50PPM

R68

Ethernet Reference

LVCMOS33

25.000000 MHz ± 50PPM

LVCMOS33

25.000000 MHz ± 25PPM

R69

Programmable Logic
Reference

To Check the LCD

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

WWW.SIGLENT.COM

85 / 88

SDS5000X Series Digital Oscilloscope Service ManualConnect the LCD cable to the acquisition board.

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

8.7.1 To Check the LCD Power Supply
Find and measure those test points using a multi-meter.

Figure 35 Test points for the LCD power supplies

Table 21 Voltage parameters of the LCD power supplies

Net Name

Test Point

Tolerance

12V6_LCD

L71+12.6 V𝐷𝐶 ± 10%-6V5_LCD

L72-6.5 V𝐷𝐶 ± 10%

VCC3V3

J32 PIN
2/4/6

3.3 V𝐷𝐶 ± 10%

If the power supply is abnormal, replace the acquisition board.

8.7.2 To Check the LCD Signal
Locate connector J32, use an oscilloscope to measure the signal using themethod below.

86 / 88

WWW.SIGLENT.COM

SDS5000X Series Digital Oscilloscope Service Manual

Figure 36 Test points for LCD signal

Table 22 Signal parameters of the LCD

Test Point

SignalLevel

Description
PWM signal to control theJ32 PIN5

J32 PIN8/10

J32 PIN11/13

J32 PIN16/18

J32 PIN19/21

LCD_ONLCD_DATA0_N/P

LCD_DATA1_N/P

LCD_DATA2_N/P

LCD_CLK_N/P

LVCMOS33

brightness of the LCD.
Normally 50% duty cycle.

LVDS

LVDS

LVDS

LVDS

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

typical 50MHz



If the signal is good, replace the LCD panel.



If the signal is dead, replace the acquisition board.

WWW.SIGLENT.COM

reference clock,87 / 88

SDS5000X Series Digital Oscilloscope Service Manual

88 / 88

WWW.SIGLENT.COM