SIGLENT SDL1000X User manual

SDL1000X series service manual
Service Manual
E01B
SDL1000X series
Programmable DC Electronic Load

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 or
translated 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 the
reason why the fuse burned out before replacing the fuse.
Ground the instrument
The instrument is grounded through the protective ground conductor of the
power cord. To avoid electric shock, the grounding conductor must be
connected 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 lead
to further damage. Please maintain proper ventilation and check the fan and
air-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 and
external 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 the
performance of the instrument, please keep surface of the product clean and
dry.

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 Protective Warning Earth Power
Voltage Earth Ground Ground Switch

SDL1000X series service manual
Content
Copyright and Statement ....................................................................................................... 2
General Safety Summary ....................................................................................................... 3
Safety Terms and Symbols .................................................................................................... 5
Chapter 1 General Features and Specifications................................................................ 8
Main features of SDL1000X.............................................................................................. 8
Specifications.................................................................................................................... 10
Prepare Information.......................................................................................................... 12
Power-on Inspection......................................................................................................... 12
Interface 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 and
Specifications
SDL1000X/SDL1000X-E series Programmable DC Electronic Load has a 3.5
inch TFT-LCD display, and comes with a simple, user-friendly interface and
superb performance specifications. The SDL1020X/ SDL1020X-E comes with
an input range of 150 V/30 A @ 200 W. The SDL1030X/ SDL1030X-E comes
with an input range of 150 V/30 A @ 300 W. The SDL1000X series leads with
measurement 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 power
industry, 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 and
states 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 the
temperature range of 25°C±5°C with warm-up time of 30 minutes.
Model
SDL1020X（Single channel 200 W）
Input Rating
( 0～40 ℃)
Input voltage
0~150 V
Input current
0~5 A
0~30 A
Input power
200 W
Minimum
Operating
Voltage(DC)
0.13 V at 5 A
0.8 V at 30 A
CV Model
Range
0~36 V
0~150 V
Resolution
1 mV
1 mV
Accuracy
±(0.02%+0.025% FS 50 ppm/℃
CC Model
Range
0~5 A
0~30 A
Resolution
0.1 mA
0.1 mA
Accuracy
±(0.03%+0.05% FS) 100 ppm/℃
CR Model *1
Range
0.03 Ω~10 KΩ
Resolution
16 bit
Accuracy
0.01%+0.0008 S [1]
CP Model *2
Range
200 W
Resolution
10 mW
Accuracy
0.1%+0.1% FS
Dynamic model
CC model
T1&T2
20 uS~3600 S/Res:1 uS
Accuracy
20 us~200 ms/Acc:5 us，200ms~3600s/Acc:5
ms
Current Slew rate *3
0.0001~0.5 A/us
0.001~2.5 A/us
Minimum rise time
≈10 uS
≈12 uS
Measuring range
Readback Voltage
Range
0~36 V
0~150 V
Resolution
1 mV
1 mV
Accuracy
±(0.015%+0.02% FS) 20 ppm/℃
Readback Current
Range
0~5 A
0~30 A
Resolution
0.1 mA
0.1 mA
Accuracy
±(0.03%+0.05% FS) 50 ppm/℃
Readback Power
Range
200 W
Resolution
10 mW
Accuracy
±(0.1%+0.1% FS)
Range
0.03 Ω~10 KΩ

SDL1000X series service manual
Readback
Resistance
Resolution
16 bit
Protection range
OPP
≈210 W
OCP
≈5.2 A
≈31 A
OVP
≈155 V
OTP
≈85℃
Battery
Measurement
Battery Input:0.5~150 V;Max Measurement: Capacity=999
AH;Resolution=0.1 mA;Time Range=1 S~16 H
Input Resistance
350 KΩ
Dimension
W256*H115*D410 (mm)
Weight
5.8 Kg
*1 CR Model
V Range
I Range
R Range
Accuracy
Test
condition
5 A
36 V
0.2 Ω~6 Ω
SET*0.01%+0.8S
V>3.6 V OR
I>0.5 A
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
I>10 mA
150 V
1 Ω~30 Ω
SET*0.01%+0.08S
V>15 V OR
I>0.5 A
30 Ω~300 Ω
SET*0.01%+0.0008S
300 Ω~1000 Ω
1000 Ω~10 KΩ
SET*0.01%+0.0002S
I>10 mA
30 A
36 V
0.03 Ω~1.2 Ω
SET*0.01%+3 S
V>3.6 V OR
I>3 A
1.2 Ω~12 Ω
SET*0.01%+0.08 S
12 Ω~40 Ω
40 Ω~400 Ω
SET*0.01%+0.002S
I>10mA
150 V
0.2 Ω~5 Ω
SET*0.01%+0.8 S
V>15 V OR
I>3 A
5 Ω~50 Ω
SET*0.01%+0.008 S
50 Ω~150 Ω
SET*0.01%+0.00S
150 Ω~1800 Ω
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 the
full scale.
*3 Current slew rate: rising slew rate for 10%~90% of the current (0-
maximum 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 of
the load.
Note: to avoid electric shock, make sure that the instrument is correctly
grounded to the earth before connecting AC power.
Figure 1-1 connect the power cord
power
jack

SDL1000X series service manual
Interface test
The SDL1000X series supports four standard interfaces: USB Device, LAN
interface, RS232 interface and GPIB interface. Through these interfaces, the
electronic 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 is
working 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
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
usb
jack

SDL1000X series service manual
pop up, click on the “USBTMC” option on the window, and pop up the
information 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.
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, then click the “VXI11” option on the window .Finally, input the
electronic 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)
LAN
jack

SDL1000X series service manual
Chapter 2 Performance Verification
This chapter main describes how to test and verify whether the main functions
of the electronic load meet the specifications. To ensure the accuracy of the
measurements, 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
example
Digital multimeter
6-digit half precision (with
sufficient current
measurement test range )
SDM3065X
Electronic load
Voltage and current power
is greater than the power
supply output
Connection cable
Power supply cable
DC power supply
Output DC voltage
exceed 150 V
The following is a schematic diagram of the connection between the electronic
load 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 the
test data to below table.
Verify output voltage accuracy
Test overview: In the two-wire or the four-wire mode, and inputting a voltage
that is within (under)the rated input voltage, measure and record the actual
and readback voltage value relative to the set voltage; reflect the voltage
accuracy of the electronic load.
Formula: Setting voltage accuracy =


 （1）
Formula: Readback voltage accuracy =
  （2）
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 and
note 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 each
setting, repeat step (c) for each setting.
(e) Calculate the corresponding set voltage accuracy by the formula (1) and
the 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
SDL1020X
Mode
Set Voltage
(V)
Measured Voltage
(V)
Readback Voltage
(V)
Pass /
Fail
2 wire
150 V
75 V
40 V
10 V
1 V
0.1 V
0.01 V
0 V
4 wire
150 V
75 V
40 V
10 V
1 V
0.1 V
0.01 V
0 V
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; to
determine the current accuracy of the electronic load.
Formula: Setting current accuracy =

 （3）
Formula: Readback current accuracy =

 （4）
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 to
the 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 manual
the electronic load.
(b) Set the power supply to 31 A/7 V then turn on the output. Record the
reading 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)for
each setting.
(d) Calculate the corresponding current setting accuracy by the formula (3)
and the readback current accuracy by the formula（4）. Take the
maximum value in the calculation result to determine whether the
SDL1020X meets its published specification
Table 2-3
Model
Set Current
(A)
Measured
Current (A)
Readback
Current (A)
Pass /
Fail
SDL1020X
0 A
0.01 A
0.1 A
1 A
5 A
15 A
30 A
Verify output resistor accuracy
Test overview: Test the actual resistor and readback resistor value relative to
the set voltage and current. Voltage should be improve when test high
resistance 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 to
constant 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 electronic
load.
(b) Set the power supply to 10 A/15 V, turn on the output. Record the reading
of 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 each
setting.
(d) Calculate the corresponding current setting accuracy by the formula (3)
and the readback current accuracy by the formula（4）. Take the
maximum value in the calculation result to determine whether the
SDL1020X meets its published specification.
Table 2-3
Model
Set
Resistance
(Ω)
Measured
Resistance (Ω)
Readback
Resistance (Ω)
Pass /
Fail
SDL1020X
0.05 Ω
0.5 Ω
5 Ω
100 Ω
1000 Ω
10000 Ω

SDL1000X series service manual
Chapter 3 Disassembly and
assembly
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 to
the 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 three
minutes until the internal capacitor of the electronic load is discharged.
ESD Prevention
Electrostatic discharge (ESD) can cause damage to the electronics inside the
electronic 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
Module name
1
handle components
2
the metal plate
3
the front shell component
4
the hardware components
5
back hardware components
6
hardware main component