SDL1000X series service manual

SDL1000X series
Programmable DC Electronic Load

Service Manual
E01B

SDL1000X series service manual

Copyright and Statement
Copyright
SIGLENT TECHNOLOGIES CO., LTD. All rights reserved.

Trademark Information
SIGLENT is registered trademark of SIGLENT TECHNOLOGIES CO., LTD.

Statement● SIGLENT products are protected by patent laws in and outside of the P.R.

China.
● SIGLENT reserves the rights to change the specification and price.
● Information in this publication replaces all previous corresponding
published material.
● Contents in this manual are not allowed to be copied, extracted ortranslated in any form or by any means without SIGLENT’s permission.

SDL1000X series service manual

General Safety Summary
Please review the following safety precautions carefully to avoid personal injury
or damage to this product or any product connected to it. To prevent potential
danger, please use the instrument as specified.
Use proper power cord
Only the power cord designed for the instrument and authorized by the local
country of which the instrument will be used..
Power supply
AC Input Voltages: 110 V/220 V ±10%, 50/60 Hz.
Use proper fuse
The fuse types: 110 V/220 V: T315 mA/250 V.
Make sure to use the correct type of fuse before turning on the instrument.
Do not connect the power cord before replacing the fuse. Investigate thereason why the fuse burned out before replacing the fuse.
Ground the instrument
The instrument is grounded through the protective ground conductor of thepower cord. To avoid electric shock, the grounding conductor must beconnected to the earth potential. Make certain that the instrument is properly
grounded.
Observe all terminal ratings
To avoid fire or electric shock, please observe all ratings and symbols on the
instrument. Read this guide carefully to learn more details about the ratings
before connection.
Keep proper ventilation
Inadequate ventilation may cause an increase of temperature, which will leadto further damage. Please maintain proper ventilation and check the fan andair-vents regularly when using the instrument.
Operating Conditions
Location: Use this instrument indoors, avoid strong lighting and limit exposure
to dirty/dusty environment as much as possible.
Relative humidity: <80%
Altitude: <2000 m
Temperature: 0℃ to 40℃

SDL1000X series service manual

Electrostatic Prevention
Operate in an electrostatic discharge protected area environment to avoid
damages induced by static discharges. Always ground both the internal andexternal conductors of the cable to release static before connecting.
Do not operate in an explosive atmosphere
To avoid personal injury or damage to instrument, please do not operate in an
explosive atmosphere.
Keep surface of the product clean and dry
To avoid dust or moisture in the air that may negatively influence theperformance of the instrument, please keep surface of the product clean anddry.

SDL1000X series service manual

Safety Terms and Symbols
Terms may appear on the product:
DANGER: Indicates direct injury or hazard that could occur.
WARNING: Indicates potential injury or hazard that could occur
CAUTION: Indicates potential damage to the instrument or other property that
could occur.
Symbols may appear on the product:

Hazardous
Voltage

Protective
Earth Ground

Warning

Earth
GroundPower
SwitchSDL1000X series service manualContent
Copyright and Statement ....................................................................................................... 2
General Safety Summary ....................................................................................................... 3
Safety Terms and Symbols .................................................................................................... 5
Chapter 1 General Features and Specifications ................................................................ 8
Main features of SDL1000X .............................................................................................. 8Specifications .................................................................................................................... 10
Prepare Information .......................................................................................................... 12Power-on Inspection......................................................................................................... 12Interface test ...................................................................................................................... 13
USB Device test ................................................................................................................ 13
Chapter 2 Performance Verification ................................................................................... 15
Testing report .................................................................................................................... 16
Verify output voltage accuracy........................................................................................ 16
Verify output current accuracy ........................................................................................ 17
Verify output resistor accuracy ....................................................................................... 18
Chapter 3 Disassembly and assembly .............................................................................. 20
Safety prevention .............................................................................................................. 20
Avoiding electric shocks .................................................................................................. 20
ESD Prevention................................................................................................................. 20
Module list .......................................................................................................................... 20
Equipped with tools: ......................................................................................................... 21
Teardown steps: ............................................................................................................... 21
Chapter 4 Hardware troubleshooting ................................................................................. 28
ESD Precautions............................................................................................................... 28
Required Equipment......................................................................................................... 29
MainBoard Drawing .......................................................................................................... 29
Check the Power Supply ................................................................................................. 31
Check the Analog Section ............................................................................................... 32
Voltage Checking .............................................................................................................. 32

SDL1000X series service manual

Analog section Clock Checking ...................................................................................... 32
MCU Checking .................................................................................................................. 33
Check the Digital Section ................................................................................................ 33
Voltage Checking .......................................................................................................... 33
Digital section Clock Checking ................................................................................... 33
CPU Checking ............................................................................................................... 33
Quick Guide for General Failures ................................................................................... 34
Chapter 5 Service and Support ....................................................................................... 34
Warranty ......................................................................................................................... 34
Repackaging for Shipment .......................................................................................... 35
Contact SIGLENT ............................................................................................................. 35

SDL1000X series service manual

Chapter 1 General Features andSpecifications

SDL1000X/SDL1000X-E series Programmable DC Electronic Load has a 3.5
inch TFT-LCD display, and comes with a simple, user-friendly interface andsuperb performance specifications. The SDL1020X/ SDL1020X-E comes withan input range of 150 V/30 A @ 200 W. The SDL1030X/ SDL1030X-E comeswith an input range of 150 V/30 A @ 300 W. The SDL1000X series leads withmeasurement resolution of 0.1 mV/0.1 mA while the base SDL1000X-E series
resolution is 1 mV/1 mA. Adjustable current slew rate range is 0.001 A/μs~2.5
A/μs, and it comes with built-in RS232/USB/LAN communication interfaces.
Standard SCPI communication protocol is used to establish an intelligent
testing platform for applications in various industries, such as the powerindustry, battery industry, LED lighting, automotive electronics, and aerospace.

Main features of SDL1000X⚫

SDL1020X (Single channel)：DC 150 V/30 A，total power up to 200 W⚫

SDL1030X (Single channel)：DC 150 V/30 A，total power up to 300 W⚫

4 Static modes / Dynamic mode：CC/CV/CR/CP⚫

CC Dynamic modes：continuous, pulsed, toggled⚫

CC Dynamic mode: 25 kHz, CP Dynamic mode: 12.5 kHz, CV Dynamic
mode: 0.5 Hz⚫

Adjustable current slew rate range 0.001 A/us~2.5 A/us⚫

Min read-back resolution: 0.1 mV, 0.1 mA

SDL1000X series service manual⚫

Measuring speed of voltage and current: up to 500 KHz⚫

List can edit 100 steps;⚫

Supports 50 groups of steps in program function⚫

Over current protection test ,Over power protection test , Battery test,
short circuit and CR-LED test functions⚫

4-wire SENSE compensation mode function⚫

External voltage and current control function⚫

Voltage and Current monitoring output⚫

3.5 inch TFT-LCD display，capable of displaying multiple parameters andstates simultaneously⚫

With memory function in case of power lose⚫

OCP, OVP, OPP, OTP and LRV protection⚫

Waveform trend chart and easy to store and recall function⚫

Smart fan control,⚫

Remote control and measurements via PC

SDL1000X series service manual

Specifications
Unless otherwise noted, all specifications are guaranteed within thetemperature range of 25°C±5°C with warm-up time of 30 minutes.
Model

Input Rating( 0～40 ℃)

Input voltage
Input current
Input power
Minimum
Operating
Voltage(DC)
Range
Resolution
Accuracy
Range
Resolution
Accuracy
Range
Resolution
Accuracy
Range
Resolution
Accuracy

SDL1020X（Single channel 200 W）
0~150 V
0~5 A
0~30 A
200 W
0.13 V at 5 A
0.8 V at 30 A

0~36 V
0~150 VCV Model1 mV
1 mV±(0.02%+0.025% FS 50 ppm/℃
0~5 A
0~30 ACC Model0.1 mA
0.1 mA±(0.03%+0.05% FS) 100 ppm/℃0.03 Ω~10 KΩ
CR Model *1
16 bit
0.01%+0.0008 S [1]200 W
CP Model *2
10 mW
0.1%+0.1% FS
Dynamic model
CC modelT1&T2
20 uS~3600 S/Res:1 uS
20 us~200 ms/Acc:5 us，200ms~3600s/Acc:5
Accuracyms
Current Slew rate *30.0001~0.5 A/us
0.001~2.5 A/us
Minimum rise time
≈10 uS≈12 uS
Measuring range
Range
0~36 V
0~150 V
Readback Voltage Resolution
1 mV
1 mV
±(0.015%+0.02% FS) 20 ppm/℃
Accuracy
Range
0~5 A
0~30 A
Readback Current Resolution
0.1 mA
0.1 mA±(0.03%+0.05% FS) 50 ppm/℃
Accuracy
Range
200 W
Readback Power
Resolution
10 mW
Accuracy±(0.1%+0.1% FS)
Range
0.03 Ω~10 KΩ

SDL1000X series service manual

Readback
Resistance

Resolution

16 bit

OPP
OCP
OVP
OTP
Battery
Measurement

Protection range≈210 W≈5.2 A≈31 A≈155 V≈85℃
Battery Input:0.5~150 V;Max Measurement: Capacity=999
AH;Resolution=0.1 mA;Time Range=1 S~16 H

Input ResistanceDimension
Weight350 KΩ
W256*H115*D410 (mm)5.8 Kg*1 CR Model

V Range

I Range

36 V
5 A

150 V

36 V
30 A
150 V

R RangeAccuracy

0.2 Ω~6 Ω

SET*0.01%+0.8S

6 Ω~60 Ω

SET*0.01%+0.008S

60 Ω~240 Ω

SET*0.01%+0.0008S[1]

240 Ω~2500 Ω

SET*0.01%+0.0005S

1 Ω~30 Ω

SET*0.01%+0.08S

Test
condition

V>3.6 V OR
I>0.5 A
I>10 mA

SET*0.01%+0.0008S

V>15 V OR
I>0.5 A

1000 Ω~10 KΩ

SET*0.01%+0.0002S

I>10 mA

0.03 Ω~1.2 Ω

SET*0.01%+3 S

30 Ω~300 Ω
300 Ω~1000 Ω

SET*0.01%+0.08 S

V>3.6 V OR
I>3 A

40 Ω~400 Ω

SET*0.01%+0.002S

I>10mA0.2 Ω~5 Ω

SET*0.01%+0.8 S

5 Ω~50 Ω

SET*0.01%+0.008 S

1.2 Ω~12 Ω
12 Ω~40 Ω

50 Ω~150 Ω
150 Ω~1800 Ω

V>15 V OR
I>3 A

SET*0.01%+0.00S

I>10 mA
Resistance Range： [1]（ 1/(1/R+(1/R)*0.01%+0.0008),1/(1/R-(1/R)*0.01%0.0008)）*2 The input voltage/current value should not be smaller than 10% of thefull scale.
*3 Current slew rate: rising slew rate for 10%~90% of the current (0maximum current).

SDL1000X series service manual

Prepare Information
Before doing performance verification, you should master the following
operations. The following contents are included in this chapter:⚫
⚫

How to perform functional checks
How to test the interface is operating properly

For more detailed information about the Load’s operation, please refer to the
Quick Guide for the SDL1000X..

Power-on Inspection
Verify that the electronic load is working by performing a power-on check.
The SDL1000X series has a supply voltage of 100 VAC to 240 VAC. Before
connect the instrument to a power source, please select the AC voltage
selector on the rear panel of your load in order to match it with the external AC
power source. Then connect the power line to the socket on the rear panel ofthe load.
Note: to avoid electric shock, make sure that the instrument is correctly
grounded to the earth before connecting AC power.

power
jack

Figure 1-1 connect the power cord

SDL1000X series service manual

Interface test
The SDL1000X series supports four standard interfaces: USB Device, LANinterface, RS232 interface and GPIB interface. Through these interfaces, theelectronic load communicates with the outside world and implements various
higher-level functions. To ensure that the electronic load is working properly,
perform the following interface tests.

USB Device test
Use EasySDL PC software to test whether the USB Device interface isworking properly.
Tools:⚫

One SDL1000X series electronic load;⚫

One PC with USB interface;⚫

Standard USB cable (AB type);⚫

PC software EasySDL;

step：
1. Install the EasySDL on the PC and follow the prompts to install the driver.
2. Connect the electronic load to the PC with a USB cable.

Figure 1-2

USB Device interface

usb
jack

3. Run the EasySDL software. Double-click to open the software interface, click“Connect” on the top of the interface, then the “Connect Type” window willSDL1000X series service manual

pop up,click on the “USBTMC” option on the window, and pop up theinformation of the connected USB device. Then choose the correct device
to complete the connection.
LAN test
Use EasySDL to test whether the LAN interface is working properly.
Tools:⚫

One SDL1000X series electronic load⚫

One PC with a network cable interface⚫

One standard network cable⚫

EasySDL software loaded on the PC

Step：
1. Install the EasySDL on the PC and follow the prompts to install the driver.
2. Connect the power supply to the PC with a network cable.

LAN
jack

Figure 1-3 LAN interface
3. Run the EasySDL software. Double-click to open the software interface, click
the “Connect” on the top of the interface, the“ Connect Type” window will
pop up, thenclick the “VXI11” option on the window .Finally, input theelectronic load IP address in the pop-up window and click “OK” to complete
the connection. (See the user manual or quick guide for IP address settings)

SDL1000X series service manual

Chapter 2 Performance Verification
This chapter main describes how to test and verify whether the main functionsof the electronic load meet the specifications. To ensure the accuracy of themeasurements, power-on all instruments for 30 minutes.
Below is a list of the equipment needed to perform the test:
Table 2-1 equipment required for test:
description
specification
exampleDigital multimeter6-digit half precision (with SDM3065X
sufficientcurrent
measurement test range )Electronic load
Voltage and current poweris greater than the power
supply output
Connection cable
Power supply cable
DC power supply
OutputDC
voltage
exceed 150 V
The following is a schematic diagram of the connection between the electronicload and the power supply under test:

Figure 2-1

Connect the test equipment

SDL1000X series service manual

Testing report
In order to verify that the test results meet the specifications, please record thetest data to below table.

Verify output voltage accuracy
Test overview: In the two-wire or the four-wire mode, and inputting a voltagethat is within (under)the rated input voltage, measure and record the actualand readback voltage value relative to the set voltage; reflect the voltage
accuracy of the electronic load.
∆𝑉𝑜
Formula: Setting voltage accuracy =∗ 100%（1）
𝑉𝑠𝑒𝑡∆𝑉𝑏𝑎𝑐𝑘Formula: Readback voltage accuracy =∗ 100%（2）
𝑉𝑠𝑑𝑚
Voltage control accuracy: ±(0.02%+0.025% FS)
Voltage readback accuracy: ±( 0.015%+0.025%) FS
Preset conditions: room temperature
Test instrument: DC power supply, multimeter
Test methods and steps:(a) Using the SDL1020X as an example :The input voltage setting of the
SDL1020X is set to 110 V, the output terminal connect to the DC power
supply, and the multimeter inputs connected to the positive and negative
terminals of the DC power supply output terminal in parallel.
(b) Turn on the power for each device and set the multimeter to the DCV
function and auto range.
(c) Set the output of the power supply to 150 V/0.1 A. Turn on the output andnote the reading of the multimeter and the voltage readback value of the load.
(d) Set the SDL1020X to 150 V/0.1 A, 75 V/0.1 A, 40 V/0.1 A, 10 V/0.1 A, 1
V/0.1 A, 0.1 V/0.1 A, 0.01 V/0.1 A, 0 V/0. 1A in 30 A/150 V range, In eachsetting, repeat step (c) for each setting.
(e) Calculate the corresponding set voltage accuracy by the formula (1) andthe readback voltage accuracy by the formula（2）. Take the maximum value
iof the calculation result to determine whether the SPD1000X meets its
published accuracy specification.

SDL1000X series service manual

Table 2-2
Model
Mode

2 wire4 wireSet Voltage
(V)
150 V
75 V
40 V
10 V
1V
0.1 V
0.01 V
0V
150 V
75 V
40 V
10 V
1V
0.1 V
0.01 V
0V

SDL1020X
Measured Voltage Readback Voltage(V)(V)

Pass /
Fail

Verify output current accuracy
Test overview: While testing below the unit’s rated power, test the actual
output current and readback current value relative to the set voltage; todetermine the current accuracy of the electronic load.
∆𝐼𝑜
Formula: Setting current accuracy =∗ 100%（3）
𝐼𝑠𝑒𝑡∆𝐼𝑏𝑎𝑐𝑘Formula: Readback current accuracy =∗ 100%（4）
𝐼𝑠𝑑𝑙
Current control accuracy: ±(0.03%+0.05% FS)
Current readback accuracy: ±(0.03%+0.05% FS)
Preset conditions: room temperature
Test instrument: DC power supply, multimeter, electronic load
Test methods and steps:(a) Using the SDL1020X as an example: The input of the SDL1020X is set to
110 V, Turn on the power for each device, and set the electronic load tothe constant current mode. Set the multimeter to DCI (or DCA) function
using the 30 A range. Then the multimeter pen is connected in series toSDL1000X series service manualthe electronic load.
(b) Set the power supply to 31 A/7 V then turn on the output. Record thereading of the multimeter and the current readback value of the load.
(c) Set the SDL1020X to 0.0 1A/7 V，0.1 A/7 V，1 A/7 V，5 A/7 V，15 A/7
V, 30 A/7 V in the 30 A150 V range, in each setting, repeat step (b)foreach setting.
(d) Calculate the corresponding current setting accuracy by the formula (3)and the readback current accuracy by the formula（4）. Take themaximum value in the calculation result to determine whether the
SDL1020X meets its published specification
Table 2-3
Set Current(A)
0A
0.01 A
0.1 A
SDL1020X 1 A
5A
15 A
30 A
Model

Measured
Current (A)Readback
Current (A)Pass /
Fail

Verify output resistor accuracy
Test overview: Test the actual resistor and readback resistor value relative tothe set voltage and current. Voltage should be improve when test highresistance to improve accuracy; reflect the resistor accuracy of the electronic
load.

Formula: Setting resistor accuracy =(1/(1/Rset+(1/Rset)*0.01%+0.0008),1/(1/Rset-(1/Rset)*0.01%-0.0008)）（3）
Current control accuracy: 0.01%+0.0008 S
Preset conditions: room temperature
Test instrument: DC power supply, multimeter, electronic load
Test methods and steps:(a) Using the SDL1020X as an example :The input of the SDL1020X is set
to 110V.turn on the power for each device. Set the electronic load toconstant resistance mode and set the multimeter to the suitable range ofSDL1000X series service manual

the DCI, and the multimeter pen is connect in series to the electronicload.
(b) Set the power supply to 10 A/15 V, turn on the output. Record the readingof the multimeter and the current readback value of the load.
(c) Set the SDL1020X to 0.05 Ω，0.5 Ω， 5 Ω，100 Ω，1000 Ω,
10000 Ωin 30 A150 V range, in each setting, repeat step (b) for eachsetting.
(d) Calculate the corresponding current setting accuracy by the formula (3)and the readback current accuracy by the formula（4）. Take themaximum value in the calculation result to determine whether the
SDL1020X meets its published specification.
Table 2-3

Model

Set
Resistance(Ω)
0.05 Ω
0.5 Ω

SDL1020X 5 Ω100 Ω1000 Ω
10000 ΩMeasuredResistance (Ω)

Readback
Resistance (Ω)

Pass /FailSDL1000X series service manual

Chapter 3 Disassembly andassembly
This chapter mainly describes how to disassemble and assemble the module
units of the SDL1000X series electronic load. Please refer to the given
procedure to remove or replace the corresponding load unit.
The following are the main contents of this chapter:⚫ Safety considerations include safety factors to be considered when
performing disassembly operations⚫ Module unit contains all detachable modular units of the power supply⚫ Preparation tool Contains the tools to be used during the disassembly
process⚫ Removal procedure Contains specific removal steps

Safety prevention
Only professional technicians can perform this disassembly step. Be sure to
disconnect all the power connections before operation, otherwise damage tothe instrument components or personal injury may result.

Avoiding electric shocks
Because there is a dangerous voltage in the electronic load, be sure to
disconnect the power supply before disassembling and wait for about threeminutes until the internal capacitor of the electronic load is discharged.

ESD Prevention
Electrostatic discharge (ESD) can cause damage to the electronics inside theelectronic load. Therefore, please use anti-static measures appropriately during
the disassembly process. It is best to place the electronic load on an antistatic
mat and wear antistatic gloves.

Module list
All the module units of the electronic load are listed in the order of disassembly
as follows:
Table 4-1 list of power modules
Module serial number
1
2
3
4
5
6

Module namehandle components
the metal plate
the front shell component
the hardware components
back hardware components
hardware main component

SDL1000X series service manual

Equipped with tools:
1. Anti-static gloves;
2. The multifunctional screwdriver or electric group;
3. The screwdriver or long nose pliers.

Teardown steps:
This chapter mainly introduces how to remove and install the load of each
module unit, please follow the steps given in below the right operation.
3.1 Open handle components
Remove the two plastic handle of the electronic load.

Figure 3-1

SDL1000X series service manual

3.2 Remove the foot pad and metal shell
Remove 8 pcs M4 screw of foot pad, then remove foot pad and pull the metalshell in the direction of the red arrow.

Figure 3-2
3.3: remove the metal rear plate
Take the metal cover plate to remove
Remove the 2 pcs hex screw on the RS232 interface. Remove the 4 pcs M4 screw onboth sides of main frame and the 1pcs M3 screw on the power supply grounding cable.
At the same time remove the power carrier, the DIP switch and the cable of rearinterface. At last pull the metal cover plate in the direction of the red arrow.

SDL1000X series service manual

Figure 3-3
3.4 Remove the front shell component and the metal components
Remove between the front shell components and metal backplane 4 pcs M4screws and keyboard cable, at the same time remove the 4pcs M4 screws thatconnect the front shell component to the shrapnel, then separating the front
shell components and metal component.

Figure 3-4

SDL1000X series service manual

3.5 Open the front shell component.
3.5.1 Remove the 7 pcs M3 screws then remove the front cover of the metal.
Figure 3-5

Figure 3-5
3.5.2 Remove the 5pcs M3 screws and 2pcs M3 copper posts that hold the
keypad and at the same time need to remove the screen cable. Then remove
the 2pcs M10 hex nut , at last separating the front shell and metal component.
Figure 3-6

Figure 3-6

SDL1000X series service manual

3.5.3 Remove the 2pcs M3 screws from metal near the LCD display, thenremove the LCD display and metal. Figure 3-7

Figure 3-7
3.6 Open the metal rack components
3.6.1 Remove the power button (pull up);
Remove the 2pcs M4 screw of the transformer, at the same time remove
the cable from the transformer. Figure 3-8.

Figure 3-8.

SDL1000X series service manual

3.6.2 Remove the 4pcs M3 screws at the bottom of the metal rack(Figure 3-9).
Remove the 11pcs M3 screws on the mainboard PCB, and then we canremove the mainboard PCB assembly. Figure 3-10.

Figure 3-9

Figure 3-10

SDL1000X series service manual

3.7 Remove the mainboard's heat sink
Remove the 4pcs M3 screw at the bottom of the mainboard(Figure 3-11)
and remove the 12pcs M3 screw from the heat sink(Figure 3-12).

Figure 3-11

Figure 3-12

SDL1000X series service manual

Chapter 4 Hardware troubleshootingThis chapter describes how to handle common hardware failuresencountered during power operation. Before handling such fault, ensure thatthe power supply meets the following prerequisites.
1. If one voltage value is found to be different from the nominal value
when measuring voltage, turn off the power immediately.
2. Turn off the power before unpacking the connecting wire of the
mainboard and the screen backlight.
3. During the process of taking apart the instrument for measurement,take measures to prevent static electricity from damaging the internal
components.
The internal structure of the electronic load consists of main board and key
board, and they are linked through cables or connectors. This chapter explains
the main checking procedures for the mainboard by measuring the rated test
points on them, thus to help you decide the reason for the failure you encounter
while operating SDL1020X.

ESD Precautions
While performing any internal test of the electronic load, please refer to thefollowing precautions to avoid damages to its internal modules or components
result from ESD.
⚫

Touch circuit boards by the edges as possible as you can.

⚫

Reduce handling of static-sensitive modules when necessary.

⚫

Wear a grounded antistatic wrist strap to insulate the static voltage from.

your body while touching these modules.
⚫

Operate static-sensitive modules only at static-free areas. Avoid handling
modules in areas that allow anything capable of generating or holding astatic charge.

SDL1000X series service manual

Required Equipment
The equipment listed in the table are required to troubleshoot the electronic
load.
Table 4-1required equipment
Equipment

Critical Specifications

ExampleAccuracy ±0.05%

SDM3055

Digital Multimeter

1 mV resolution
Oscilloscope

200MHz Bandwidth

SDS1202X-E

MainBoard Drawing
The main board consists of power、analog and digital three sections:1）、Power section：110/220 V is converted to a low voltage to supply the analog
and digital sections.
2）、Analog section：It mainly realizes the functions of CC、CV、CR、CP and
so on.
3）、Digital section：Responsible for data processing and function control、
LCD display control.

SDL1000X series service manualSDL1000X series service manual

Check the Power Supply
Both the analog and digital sections have a power connector, and we can check
whether the input voltage is within the specification. Before performing thepower supply testing procedure, please make sure that the electronic load isgrounded correctly through the protective lead of the power cord. Take care not
to touch or even disassemble the power supply module without any safety
precautions, or you may probably suffer from electric shock or burn. Here areprocedures for testing the power supply:
1. Disconnect the power cord of the electronic load and then check whether thefuse has been burnt out.
2. Remove metal shell of the electronic load using a driver, and then disconnect
the power connector.
3. Focus on the Power Connector for analog section, which contains five pinsfrom Pin1 to Pin5. You can test the adjacent pins that are marked with blue,
brown, yellow and white to check whether the AC voltage value is within thecorresponding specified range using a digital Multimeter. The voltage
parameters to be tested are listed in table below:
Table 4-2 Test AC voltages for the analog section power connector
Pins

Voltage (V)Error (V)blue to blue

8

±1

Yellow to brown

16±2

White to yellow

16±2

Table 4-3Test AC voltage for the digital section power connector
Pins

Voltage (V)Error (V)Black to black

12±2

If each tested voltage value is within the corresponding spec range referring to
the table above, then the power supply works normally. Otherwise, it proves tobe faulted, please return it to the factory to have it repaired or contact SIGLENT.
Note:The main power supply provides an input fuse to protect against thedanger of fire in the event of a failure of the power supply circuitry. However,this fuse will not fail ("open" or "blow") in normal power supply operation exceptthat a significant overload occurs. Replace the entire main power supply
assembly if the input fuse fails.

SDL1000X series service manual

Check the Analog Section
To avoid some chips or components on the main board being damaged foroverheating, it is essential to cool the main board whenever possible using afan. Here are procedures for testing the main board:
1. Several kinds of connectors including Fan Connector, Power Connector andKeypad Connector are located on the main board. Check if all theseconnectors are connected properly.
2. Make sure that the connectors on the channel board are properly connected,
then connect the electronic load to AC power and turn it on. Check if thevoltage values at all test points are within the spec range using a digital
Multimeter. The voltage parameters to be tested are listed in table below:

Voltage Checking
Test the voltage points on the analog section in the table below. If each tested
voltage value is within the corresponding spec range referring to the table
above, then the analog section works normally. Otherwise, it proves to befaulted, please return it to the factory to have it repaired or contact SIGLENT.
Table 4-3 Test DC voltages of the analog board
Test point

Name

Test pin

Voltage (V)Error (V)

T1

U18

3

+15

±1

T2

U19

3

-15

±1

T3

U9

3

+5

±0.25

T4

U9

2 or 4+3.3±0.065

T5

UB11

6

+2.5

±0.0025

T11

AGND

1

0

/

Analog section Clock Checking
Analog section clock is the internal system clock of the electronic load. To verify
if the clock on the analog section works normally, please test the clock
frequency listed below using an oscilloscope.
Test point

Name

Pin

Frequency

Stability

T6

RD60

1 or 2

25MHz±50ppm

SDL1000X series service manual

MCU Checking
Look at the LED light on the analog section, which indicates the working stateof MCU. If the light flashes at a certain frequency, then the corresponding codes
have been loaded successfully and the chip is in good working state. Otherwise,
there may be failure within it.

Check the Digital Section
Voltage Checking
Test the voltage points on the digital section in the table below. If each tested
voltage value is within the corresponding spec range referring to the table
above, then the digital section works normally. Otherwise, it proves to be faulted,
please return it to the factory to have it repaired or contact SIGLENT.
Test point
T7

Name

Test pin

Voltage (V)Error (V)

U5

8

3.3

±0.065

Digital section Clock Checking
To verify if the clock on the digital section works normally, please test the clock
frequency listed below using an oscilloscope.
Test point

Name

Pin

Frequency

Stability

T8

R18

1 or 2

25MHz±50ppmCPU Checking
There is no light in the digital section to indicate the working status of the CPU，
We can check if the CPU and MCU are communicating, if so, the CPU works
normally. Please view the communication signals listed below using anoscilloscope.
Test point

T9

T10

Name

U6

SC8

Pin

Signal3

SPI_CS

4SPI_SCK5

SPI_MOSI6

SPI_MISO1

DGND

SDL1000X series service manual

Quick Guide for General Failures
The general hardware failures are described in the following. Reading thefollowing information can help you quickly handle some easy hardware failureswith more convenience.
1. No start-up after pressing the Power button:(1) Check if the power cord is correctly connected.
(2) Check if the power button is usable.
(3) Check whether the fuse has been burnt out. If the fuse needs to bechanged, please contact SIGLENT as soon as possible and return the
instrument to the factory to have it repaired by qualified personnel.
(4) Check if the power connector is properly connected to the main board.
(5) If the instrument still does not work normally, please contact SIGLENT.
2. The instrument starts up with a dark screen:(1) Check if the power connector is properly connected to the main board.
(2) If the instrument still does not work normally, please contact SIGLENT.
3. No response after pressing any button or abnormal display of thescreen:(1) Check if the two end of the connector between the keypad circuit board
and the main board is properly connected.
(2) If the instrument still does not work normally, please contact SIGLENT.

Chapter 5 Service and Support
Warranty
SIGLENT warrants that the products it manufactures and sells are free fromdefects in materials and workmanship for a period of three years from the dateof shipment from an authorized SIGLENT distributor. If a product provesdefective within the respective period, SIGLENT will provide repair or
replacement as described in the complete warranty statement.
To arrange for service or obtain a copy of the complete warranty statement,
please contact your nearest SIGLENT sales and service office.
Except that as provided in this summary or the applicable warranty Statement,
SIGLENT makes no warranty of any kind, express or implied, including without
limitation the implied warranties of merchantability and fitness for a particularSDL1000X series service manual

purpose. In no case shall SIGLENT be liable for indirect, special orconsequential damages.
Repackaging for Shipment
If the unit needs to be shipped to SIGLENT for service or repair, be sure to:
1. Attach a tag to the unit identifying the owner and indicating the required
service or repair.
2. Place the unit in its original container with appropriate packaging material
for shipping.
3. Secure the container with strong tape or metal bands.
If the original shipping container is not available, place your unit in a container
which will ensure at least 4 inches of compressible packaging material aroundall sides for the instrument. Use static-free packaging materials to avoid
additional damage to your unit.

Contact SIGLENTSIGLENT Technologies Co., Ltd
Address：3/F, building NO.4, Antongda Industrial Zone, 3rd LiuxianRoad, Bao’an District, Shenzhen, P.R.China
Tel：+86-755-3688 7876
E-mail: sales@siglent.com
http://www.siglent.com

SIGLENT Technologies America, Inc
Address: 6557 Cochran Rd Solon, Ohio 44139
E-mail: info@siglent.com
http://www.siglentamerica.com

SIGLENT Technologies Germany GmbH
Staetzlinger Str. 70, 86165 Augsburg, Germany
E-mail: info-eu@siglent.com
Web: www.siglenteu.com