SIGLENT SDS5000X Series User manual

SDS5000X Series
Digital Oscilloscope
Service Manual
SM0105X-E01A

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Contents
CONTENTS.............................................................................................................................. 2
1GENERAL 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
2FIRST STEPS.................................................................................................................... 11
DELIVERY CHECKLIST .................................................................................................................. 11
QUALITY ASSURANCE ..................................................................................................................11
MAINTENANCE AGREEMENT ..........................................................................................................12
3DOCUMENT CONVENTIONS.............................................................................................. 13
4PREPARE 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
4.2.1 USB Host Test ................................................................................................................... 19
4.2.2 USB Device Test................................................................................................................20
4.2.3 LAN Port Test ....................................................................................................................22
4.2.4 Pass/Fail out Test.............................................................................................................25
5PERFORMANCE 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

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TO VERIFY TRIGGER SENSITIVITY..................................................................................................49
TO VERIFY CHANNEL SKEW ..........................................................................................................52
TO VERIFY INPUT IMPEDANCE ....................................................................................................... 53
6DISASSEMBLY 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
7SOLVING GENERAL PROBLEMS ......................................................................................... 64
8TROUBLESHOOTING ........................................................................................................ 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

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1General 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 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 documentation to protect against
personal injury or damage to the instrument.
This symbol warns of a potential risk of shock hazard.
This symbol is used to denote the measurement ground
connection.
This symbol is used to denote a safety ground connection.
This symbol shows that the switch is an On/Standby switch.
When it is pressed, the scope’s state switches between
Operation and Standby. This switch does not disconnect the
device's power supply. To completely power off the scope, the
power cord must be unplugged from the AC socket after the
oscilloscope is in the standby state.
This symbol is used to represent an alternating current, or "AC".

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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 a
clean, dry environment with an ambient temperature range of 0 °C - 40 °C.
Temperature
Operating: 0 ℃ to +40 ℃
Non-operation: -20 ℃ to +60 ℃
Humidity
Operating: 85% RH, 40 ℃, 24 hours
Non-operating: 85% RH, 65 ℃, 24 hours
Altitude
Operating: ≤3,000 m
Non-operating: ≤15,266 m

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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 power
source).
Degree of Pollution II refers to a working environment which is dry and
non-conductive pollution occurs. Occasional temporary conductivity
caused by condensation is expected.
CAUTION: Protect the display touch screen of the scope from
excessive impact.

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CAUTION: Do not exceed the maximum specified front panel
terminal (CH1, CH2, CH3, CH4, EXT) voltage levels. Refer to
Specifications 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 and
ventilation 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 sides
of the scope.
CAUTION: Do not allow any foreign matter to enter the scope
through 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%)

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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 the
following 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 three-
terminal polarized plug and a standard IEC320 (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 hazard, the power cord
plug must be inserted into a mating AC outlet containing a safety
ground contact. Use only the power cord specified for this instrument
and certified for the country of use.

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Warning: Electrical Shock Hazard!
Any interruption of the protective ground conductor within or
outside of the scope or disconnection of the safety ground
terminal creates 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 and
therefore 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

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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 the
power 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 or
used for patient monitoring.

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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 to
contact 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 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.

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c) The use of non-SIGLENT accessories or supplies. Furthermore,
SIGLENT shall not be obligated to service a product that has been
modified. Spare, replacement parts and repairs have a 90-day
warranty.
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.
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 your
local SIGLENT customer service center or distributor.

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3Document Conventions
For convenience, text surrounded by a box border is used to represent
the button of the front panel. For example, Print represents the "Print"
button on the front panel. Italicized text with shading is used to
represent the touchable or clickable menu/button/region on the touch
screen. For example, DISPLAY represents the "DISPLAY" menu on the
screen:
For the operations that contain multiple steps, the description is in the
form of "Step 1 > Step 2 >...".As an example, follow each step in the
sequence 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.

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4Prepare 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 four standard interface tests
How to use the self-calibration routine
How to recall factory default settings
For more detailed information about oscilloscope operation, please
refer to 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

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instrument to connect it to AC power.
Figure 1 Connect the power cord
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
and note that several buttons will be lighted for about 6 seconds
simultaneously until the boot screen appears. The oscilloscope will then
begin to perform its power-on tests automatically, after which the
Default button can be pressed to recall the factory default settings.

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4.1.2 Probe Compensation
When a probe is used for the first time, you should compensate it to
match the input channel of the oscilloscope. Non-compensated or
poorly compensated probe may increase measurement inaccuracy or
error. The probe compensation procedures are as follows:
1. Connect the coaxial cable interface (BNC connector) of a passive
probe to any channel of the oscilloscope.
2. Connect the probe to the “Compensation Signal Output
Terminal” (Cal) on the front of the oscilloscope. Connect the
ground alligator 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
Compensated
Perfectly
Compensated
Over
Compensated
5. Use a non-metallic driver to adjust the low-frequency
compensation adjustment hole on the probe until the waveform
displayed is as the “Perfectly compensated” in the figure
above.

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4.1.3 Auto Setup
Press the Auto Setup button to enable the waveform auto setting
function. The oscilloscope will automatically adjust the horizontal time
base, 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 (< 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.

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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>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.

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Interface Test
The SDS5000X 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
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.

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Figure 3 USB drive detected
4.2.2 USB Device Test
To test if the USB Device interface is operating correctly.
Tools:
A computer with a USB interface
A standard USB cable (Type AB)
National Instruments NI-Max software
Steps:
1. Set up the NI-Max software on a computer and install the driver step
by step following the instructions.