SIGLENT TECHNOLOGIES SDS2000X HD Series User manual

SDS2000X HD Series
Digital Oscilloscope
Service Manual
EN01A

SDS2000X HD Service Manual 1
Contents
1IMPORTANT SAFETY INFORMATION...............................................................................................3
1.1 GENERAL SAFETY SUMMARY............................................................................................................................3
1.2 SAFETY TERMS AND SYMBOLS..........................................................................................................................6
1.3 WORKING ENVIRONMENT .................................................................................................................................7
1.4 COOLING REQUIREMENTS ................................................................................................................................8
1.5 POWER AND GROUNDING REQUIREMENTS .........................................................................................................9
1.6 CLEANING..................................................................................................................................................... 10
1.7 ABNORMAL CONDITIONS ................................................................................................................................10
1.8 SAFETY COMPLIANCE ....................................................................................................................................11
2FIRST STEPS....................................................................................................................................12
2.1 DELIVERY CHECKLIST .................................................................................................................................... 12
2.2 QUALITY ASSURANCE .................................................................................................................................... 12
2.3 MAINTENANCE AGREEMENT............................................................................................................................ 12
3DOCUMENT CONVENTIONS...........................................................................................................13
4PREPARE INFORMATION................................................................................................................14
4.1 FUNCTIONAL CHECK ...................................................................................................................................... 14
4.1.1 Power-on Inspection............................................................................................................................ 14
4.1.2 Probe Compensation...........................................................................................................................15
4.1.3 Auto Setup........................................................................................................................................... 16
4.1.4 Self-Calibration....................................................................................................................................16
4.2 INTERFACE TEST ...........................................................................................................................................18
4.2.1 USB Host Test..................................................................................................................................... 18
4.2.2 USB Device Test................................................................................................................................. 19
4.2.3 LAN Port Test......................................................................................................................................20
4.2.4 Pass/Fail out Test................................................................................................................................ 22
5PERFORMANCE TEST.....................................................................................................................25
5.1 TO VERIFY DC GAIN ACCURACY.....................................................................................................................27
5.2 TO VERIFY OFFSET ACCURACY ...................................................................................................................... 33
5.3 TO VERIFY DC MEASUREMENT ACCURACY...................................................................................................... 36
5.4 TO VERIFY BANDWIDTH.................................................................................................................................. 37
5.5 TO VERIFY TIME BASE ACCURACY .................................................................................................................. 40
5.6 TO VERIFY TRIGGER LEVEL............................................................................................................................41
5.7 TO VERIFY EXT TRIGGER LEVEL .....................................................................................................................42
5.8 TO VERIFY TRIGGER SENSITIVITY.................................................................................................................... 43
5.9 TO VERIFY CHANNEL SKEW............................................................................................................................45
5.10 TO VERIFY INPUT IMPEDANCE.........................................................................................................................46

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6DISASSEMBLY PROCEDURES.......................................................................................................48
6.1 SAFETY CONSIDERATION AND CAUTIONS .........................................................................................................48
6.2 TOOLS LISTS................................................................................................................................................. 49
6.3 DISASSEMBLY PROCEDURES .......................................................................................................................... 49
6.3.1 To Remove the Handle and Foot ........................................................................................................49
6.3.2 To Remove the Rear Cover.................................................................................................................50
6.3.3 To Remove the Rear Metal Cover....................................................................................................... 51
6.3.4 To Remove the Back-Chassis Module ................................................................................................ 52
6.3.5 To Remove the Power Supply Module, Fan and I/O board................................................................. 53
6.3.6 To Remove Front Panel ...................................................................................................................... 54
6.3.7 To Remove the Probe interface board and Mainboard........................................................................55
6.3.8 To Remove the Rubber Keypad and Keyboard...................................................................................56
7SOLVING GENERAL PROBLEMS ...................................................................................................57
8TROUBLESHOOTING.......................................................................................................................60
8.1 SAFETY CONSIDERATION AND CAUTIONS .........................................................................................................60
8.2 REQUIRED EQUIPMENT .................................................................................................................................. 61
8.3 TROUBLESHOOTING FLOWCHART ....................................................................................................................61
8.4 TO CHECK THE POWER SUPPLY MODULE ........................................................................................................ 62
8.5 TO CHECK THE ACQUISITION BOARD ...............................................................................................................63
8.5.1 Acquisition Board Drawing .................................................................................................................. 63
8.5.2 Check the board-level power supplies.................................................................................................64
8.5.3 Check the clock...................................................................................................................................68
8.6 TO CHECK THE LCD...................................................................................................................................... 70
8.6.1 To Check the LCD Power Supply........................................................................................................70
8.6.2 To Check the LCD Signal.................................................................................................................... 70

SDS2000X HD Service Manual 3
1 Important Safety Information
This manual contains information and warnings that must be followed by the user for safe operation
and to keep the product in a safe condition.
1.1 General Safety Summary
Carefully read the following safety precautions to avoid personal injury and prevent damage to the
instrument and any products connected to it. To avoid potential hazards, please use the instrument
as specified.
To Avoid Fire or Personal Injury.
Use Proper Power Line.
Only use a local/state-approved power cord for connecting the instrument to mains power sources.
Ground the Instrument.
The instrument grounds through the protective terra conductor of the power line. To avoid electric
shock, the ground conductor must be connected to the earth. Make sure the instrument is grounded
correctly before connecting its input or output terminals.
Connect the Signal Wire Correctly.
The potential of thesignal wire is equal to the earth, so donot connectthe signal wireto a highvoltage.
Do not touch the exposed contacts or components.
Look over All Terminals’ Ratings.
To avoid fire or electric shock, please look over all ratings and signed instructions of the instrument.
Before connecting the instrument, please read the manual carefully to gain more information about
the ratings.
Equipment Maintenance and Service.

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When the equipment fails, please do not dismantle the machine for maintenance. The equipment
contains capacitors, power supply, transformers, and other energy storage devices, which may cause
high voltage damage. The internal devices of the equipment are sensitive to static electricity, and
direct contact is easy to cause irreparable damage to the equipment. It is necessary to return to the
factory or the company's designated maintenance organization for maintenance. Be sure to pull out
the power supply when repairing the equipment. Live line operation is strictly prohibited. The
equipment can only be powered on when the maintenance is completed and the maintenance is
confirmed to be successful.
Identification of Normal State of Equipment.
After the equipment is started, there will be no alarm information and error information at the interface
under normal conditions. The curve of the interface will scan from left to rightfreely. If there is a button
in the scanning process or there is an alarm or error prompt, the device may be in an abnormal state.
You need to view the specific prompt information. You can try to restart the setting. If the fault
information is still in place, do not use it for testing. Contact the manufacturer or the maintenance
department designated by the manufacturer to carry out maintenance to avoid the wrong test data
caused by the use of the fault or endanger the personal safety.
Not Operate with Suspected Failures.
If you suspect that there is damage to the instrument, please let qualified service personnel check it.
Avoid Circuit or Wire Exposed Components Exposed.
Do not touch exposed contacts or components when the power is on.
Do not operate in wet/damp conditions.
Do not operate in an explosive atmosphere.
Keep the surface of the instrument clean and dry.
Only probe assemblies that meet the requirement of UL61010-031 and CAN/CSA-C22.2
No.61010-031 shall be used.

SDS2000X HD Service Manual 5
Only a lithium battery with the same specifications as the original battery should be used to
replace the battery on board.
Not to use the equipment for measurements on mains circuits, not to use the equipment for
measurements on voltage exceed the voltage range describe in the manual. The maximum
additional transient voltage cannot exceed 1300 V.
The responsible body or operator should refer to the instruction manual to preserve the
protection afforded by the equipment. If the equipment is used in a manner not specified by
the manufacturer, the protection provided by the equipment may be impaired.
Any parts of the device and its accessories are not allowed to be changed or replaced, other
than authorized by the manufacturer or agent.

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1.2 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 the accompanying
information or documents to protect against personal injury or damage to the
instrument.
This symbol warns of a potential risk of shock hazard.
This symbol is used to denote the measurement ground connection.
This symbol is used to denote a safety ground connection.
This symbol shows that the switch is an On/Standby switch. When it is pressed,
the oscilloscope’s state switches between Operation and Standby. This switch
does not disconnect the device's power supply. To completely power off the
oscilloscope, the power cord must be unplugged from the AC socket after the
oscilloscope is in the standby state.
This symbol is used to represent 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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1.3 Working Environment
The design of the instrument has been verified to conform to the EN 61010-1 safety standard per the
following limits:
Environment
The instrument is used indoors and should be operated in a clean and dry environment with an
ambient temperature range.
Note: Direct sunlight, electric heaters, and other heat sources should be considered when evaluating
the ambient temperature.
Warning: Do not operate the instrument in explosive, dusty, or humid
environments.
Ambient Temperature
Operating: 0℃to +50℃
Non-operating: -30℃to +70℃
Note: Direct sunlight, radiators, and other heat sources should be taken into account when assessing
the ambient temperature.
Humidity
Operating: 5% ~ 90% RH, 30℃, derate to 50 % RH at 40℃
Non-operating: 5% ~ 95% RH
Altitude
Operating: ≤3,000 m, 25℃
Non-operating: ≤15,000 m

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Installation ( overvoltage ) Category
This product is powered by mains conforming to installation ( overvoltage ) Category II.
Note: Installation ( overvoltage ) category I refers to situations where equipment measurement
terminals are connected to the source circuit. In these terminals, precautions are done to limit the
transient voltage to a correspondingly low level.
Installation ( overvoltage ) category II refers to the local power distribution level which applies to
equipment connected to theAC line ( AC power ).
Degree of Pollution
The oscilloscopes may be operated in environments of Pollution Degree II.
Note: Degree of Pollution II refers to a working environment that is dry and non-conductive pollution
occurs. Occasional temporary conductivity caused by condensation is expected.
IP Rating
IP 20 ( as defined in IEC 60529 ).
1.4 Cooling Requirements
This instrument relies on forced air cooling with internal fans and ventilation openings. Care must be
taken to avoid restricting the airflow around the apertures( fan holes ) at each side of the oscilloscope.
To ensure adequate ventilation it is required to leave a 15 cm ( 6 inches ) minimum gap around the
sides of the instrument.
CAUTION: Do not block the ventilation holes located on both sides of the
oscilloscope.
CAUTION: Do not allow any foreign matter to enter the oscilloscope through the
ventilation holes, etc.

SDS2000X HD Service Manual 9
1.5 Power and Grounding Requirements
The instrument operates with a single-phase, 100 to 240 Vrms ( +/-10% ) AC power at 50/60 Hz ( +/-
5% ).
No manual voltage selection is required because the instrument automatically adapts to line voltage.
Depending on the type and number of options and accessories ( probes, PC port plug-in, etc .) , the
instrument can consume up to 120 W of power.
Note: The instrument automatically adapts to the AC line input within the following ranges:
Voltage Range
90 - 264 Vrms
Frequency Range
47 - 63 Hz
The instrument includes a grounded cord set containing a molded three-terminal polarized plug and
a standard IEC 320 ( Type C13 ) connector for making line voltage and safety ground connection.
The AC inlet ground terminal is connected directly to the frame of the instrument. For adequate
protection against electrical shock hazards, the power cord plug must be inserted into a mating AC
outlet containing a safety ground contact. Use only the power cord specified for this instrument and
certified for the country of use.
Warning: Electrical Shock Hazard!
Any interruption of the protective conductor inside or outside of the oscilloscope,
or disconnection of the safety ground terminal creates a hazardous situation.
Intentional interruption is prohibited.
The position of the oscilloscope should allow easy access to the socket. To make the 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 oscilloscope is not to be used for an
extended period.

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CAUTION: The outer shells of the front panel terminals (CH1, CH2, CH3, CH4,
EXT) are connected to the instrument’s chassis and therefore to the safety
ground.
1.6 Cleaning
Clean only the exterior of the instrument, using a damp, soft cloth. Do not use chemicals or abrasive
elements. Under no circumstances allow moisture to penetrate the instrument. To avoid electrical
shock, unplug the power cord from theAC outlet before cleaning.
Warning: Electrical Shock Hazard!
No operator serviceable parts inside. Do not remove covers.
Refer servicing to qualified personnel
1.7 Abnormal Conditions
Do not operate theoscilloscope if there is anyvisible sign of damage or has been subjected to severe
transport stresses.
If you suspect the oscilloscope’s protection has been impaired, disconnect the power cord and secure
the instrument against any unintended operation.
Proper use of the instrument depends upon careful reading of all instructions and labels.
Warning: Any use of the oscilloscope in a manner not specified by the
manufacturer may impair the instrument’s safety protection. This instrument
should not be directly connected to human subjects or used for patientmonitoring.

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1.8 Safety Compliance
This section lists the safety standards with which the product complies.
U.S. nationally recognized testing laboratory listing
UL 61010-1:2012/R: 2018-11. Safety Requirements for Electrical Equipment for Measurement,
Control, and Laboratory Use –Part 1: General Requirements.
UL 61010-2-030:2018. Safety Requirements for Electrical Equipment for Measurement, Control,
and Laboratory Use –Part2-030: Particular requirements for testing and measuring circuits.
Canadian certification
CAN / CSA-C22.2No. 61010-1:2012 / A1:2018-11. Safety Requirements for Electrical Equipment
for Measurement, Control, and Laboratory Use –Part 1: General Requirements.
CAN / CSA-C22.2 No. 61010-2-030:2018. Safety Requirements for Electrical Equipment for
Measurement, Control, and Laboratory Use –Part 2-030: Particular requirements for testing and
measuring circuits.

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2 First Steps
2.1 Delivery Checklist
First, verify that all items listed on the packing list have been delivered. If you note any omissions or
damage, please contact your nearest SIGLENT customer service center or distributor as soon as
possible. If you fail to contact us immediately in case of omission or damage, we will not be
responsible for replacement.
2.2 Quality Assurance
The oscilloscope has a 3-year warranty ( 1-year warranty for probes and accessories ) from the 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 the
product to make sure that the defect is caused by the process or material, not by abuse, negligence,
accident, abnormal conditions, or operation.
SIGLENT shall not be responsible for any defect, damage, or failure caused by any of the following:
a) Attempted repairs or installations by personnel other than SIGLENT.
b) Connection to incompatible devices / incorrect connection.
c) For any damage or malfunction caused by the use of non-SIGLENT supplies. Furthermore,
SIGLENT shall not be obligated to service a product that has been modified. Spare,
replacement parts, and repairs have a 90-day warranty.
The oscilloscope's firmware has been thoroughly tested and is presumed to be functional.
Nevertheless, it is supplied without warranty of any kind covering detailed performance. Products 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 maintenance agreements. 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 your local SIGLENT
customer service center or distributor.

SDS2000X HD Service Manual 13
3 Document Conventions
For convenience, text surrounded by a box border is used to represent the button of the front panel.
For example, Default represents the "Default" button on the front panel.
Text with shading is used to represent the touchable or clickable menu / button / region on the touch
screen. For example, Display represents the " Display " menu on the screen:
For the operations that contain multiple steps, the description is in the form of " Step 1 > Step 2 >...".
As an example, follow each step in the sequence to enter the upgrade interface:
Measure ＞Tools ＞Track
Press the Measure button on the front panel as step 1, click the Tools option on the screen as
step 2, and click the Track option on the screen as step 3 to enter the Track setting menu.

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4 Prepare Information
Before initiating performance verification or any adjustments, it is recommended the user follow these
procedures. The following topics are discussed in this chapter.
How to perform functional checks
How to operate standard interface tests
How to use the self-calibration routine
How to recall factory default settings
For more detailed information about oscilloscope operation, please refer to the User Manual.
4.1 Functional Check
The functional check details four types of checks used to determine if the oscilloscope is operating
properly.
4.1.1 Power-on Inspection
The standard power supply for the instrument is 100~240 V, 50/60 Hz. Please use the power cord
provided with the instrument to connect it toAC power.
Figure 1 Connect the power cord

SDS2000X HD Service Manual 15
CAUTION: To avoid electric shock, make sure that the instrument is correctly
grounded to the earth before connecting AC power.
Press the Power button located at the lower-left corner of the front panel to start the oscilloscope.
After the boot-up the oscilloscope will begin to perform its power-on tests automatically, after which
the Default button can be pressed to recall the factory default settings.
4.1.2 Probe Compensation
When a passive probe is used for the first time, you should compensate it to match the input channel
of the oscilloscope. Non-compensated or poorly compensated probes may increase measurement
inaccuracy or error. The probe compensation procedures are as follows:
1. Connect the coaxial cable interface ( BNC connector ) of the passive probe to any channel of 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.

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Under
Compensated
Perfectly
Compensated
Over
Compensated
5. Use a non-metallic driver to adjust the low-frequencycompensation adjustment hole on the probe
until the waveform displayed is as the “ Perfectly compensated ” in the figure above.
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, vertical scale, and trigger mode according to the input
signal to obtain an optimum waveform display.
Auto Setup will not work on all signal types, especially time-varying bursts or slow signals ( < 20
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.
4.1.4 Self-Calibration
The self-calibration program can quickly calibrate the oscilloscope to reach the best working state
and the most precise measurement. It is recommended to perform a self-calibration if the change of
ambient temperature is more than 5℃. Make sure the oscilloscope has been warmed up or operated
for more than 30 minutes before the self-calibration.
Please perform the self-calibration as follows:
1. Disconnect everything from all inputs.
2. Operate Utility > Menu > Maintenance > Self Calibration , and the following dialog
will appear. Select Continue to start the self-calibration program.

SDS2000X HD Service Manual 17
Figure 2 Calibration Interface
The oscilloscope will not respond to any operations until the self-calibration is finished.After the self-
calibration is completed, touch the screen or press any button to exit.

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4.2 Interface Test
The SDS2000X HD series oscilloscope is designed with four standard interfaces: USB Host, USB
Device, LAN, and Pass/Fail. Connecting to other instruments via these interfaces enables the
oscilloscope to achieve 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 ( FAT32 format recommended )
Steps:
1. Insert a U-disk ( flash drive ) into the USB Host interface on the front panel of the oscilloscope.
2. A message prompt “ USB flash drive detected .” appears on the screen, and an icon will be
shown in the lower right corner of the screen which confirms the U-disk has been successfully
recognized.
Figure 3 USB drive detected