Programmable DC Electronic Load Operation Manual V1.0

Programmable DC Electronic Load Operation Manual V1.0
BENCHTOP INSTRUMENT
Programmable
DC Electronic Load
Operation Manual V1.0
CONTENTS
Chapter1
General Introduction ...................................................................................................... - 1 -
1-1.
Function Features .......................................................................................................... - 1 -
1-2.
Production Models ......................................................................................................... - 1 -
1-3.
Front Panel .................................................................................................................... - 2 -
1-4.
Message of LCD Display................................................................................................ - 2 -
1-5.
Rear Panel ..................................................................................................................... - 3 -
1-6.
Keypad Function ............................................................................................................ - 4 -
1-7.
Menus ............................................................................................................................ - 5 -
1-8.
Display Messages .......................................................................................................... - 8 -
1-9.
Remote Programming .................................................................................................... - 9 -
Chapter2
Functions and Features ............................................................................................... - 10 -
2-1.
Local and Remote Control ........................................................................................... - 10 -
2-2.
Main Function .............................................................................................................. - 10 -
2-3.
Basic Test Function ...................................................................................................... - 10 -
2-4.
Transient Operation ..................................................................................................... - 16 -
2-5.
Sequence (List) Operation ........................................................................................... - 20 -
2-6.
Battery Discharge Operation ........................................................................................ - 21 -
2-7.
Short Circuit Operation ................................................................................................ - 21 -
2-8.
Triggered Operation ..................................................................................................... - 22 -
2-9.
Input Control ................................................................................................................ - 22 -
2-10.
Measurement Function ................................................................................................ - 25 -
2-11.
Saving and Recalling ................................................................................................... - 25 -
2-12.
Reading Remote Programming Errors ......................................................................... - 27 -
2-13.
Status Report ............................................................................................................... - 27 -
2-14.
Protection Function ...................................................................................................... - 27 -
2-15.
Auxiliary Functions ....................................................................................................... - 29 -
Chapter3
Installation .................................................................................................................... - 30 -
3-1.
Initial Check ................................................................................................................. - 30 -
3-2.
Environment/Installation Location ................................................................................ - 30 -
3-3.
Power-On/ Self-Test ..................................................................................................... - 30 -
3-4.
Connections on the Rear Panel ................................................................................... - 31 -
3-5.
Connections on the Front Panel................................................................................... - 32 -
3-6.
Wiring ........................................................................................................................... - 32 -
I
Chapter4
Local Operation............................................................................................................ - 33 -
4-1.
Local Control ................................................................................................................ - 33 -
4-2.
Main Operation on the Front Panel .............................................................................. - 33 -
4-3.
Connecting to the Power Supply .................................................................................. - 33 -
4-4.
Turning the Input On/Off .............................................................................................. - 34 -
4-5.
Basic Tests .................................................................................................................. - 34 -
4-6.
Short Circuit Operation ................................................................................................ - 38 -
4-7.
Transient Operation ..................................................................................................... - 40 -
4-8.
Sequence (List) Operation ........................................................................................... - 42 -
4-9.
Battery Discharge Operation ........................................................................................ - 47 -
4-10.
Saving and Recalling ................................................................................................... - 48 -
4-11.
Clear Protection Settings ............................................................................................. - 49 -
4-12.
Triggered Operation ..................................................................................................... - 49 -
4-13.
Main Menu ................................................................................................................... - 50 -
Chapter5
Remote Programming Operation ................................................................................. - 54 -
5-1.
Communication Interface ............................................................................................. - 54 -
5-2.
Remote Control Annunciators ...................................................................................... - 54 -
5-3.
Sending a Remote Command ...................................................................................... - 54 -
5-4.
Returning Data ............................................................................................................. - 54 -
5-5.
Remote Programming Commands ............................................................................... - 54 -
5-6.
CC Mode Example ....................................................................................................... - 55 -
5-7.
CV Mode Example ....................................................................................................... - 55 -
5-8.
CR Mode Example ....................................................................................................... - 55 -
5-9.
Continuous Transient Operation Example ................................................................... - 56 -
5-10.
Pulsed Transient Operation Example ........................................................................... - 56 -
Chapter6
Auto Test Operation ..................................................................................................... - 57 -
6-1.
Main Menu ................................................................................................................... - 57 -
6-2.
LCD Display Message ................................................................................................. - 57 -
6-3.
Function Description .................................................................................................... - 57 -
6-4.
Local Operation............................................................................................................ - 58 -
Main Specifications ........................................................................................................................... - 63 -
II
Use of Operation Manual
Please read through and understand this Operation Manual before operating the product. After reading,
always keep the manual nearby so that you may refer to it as needed. When moving the product to another
location, be sure to bring the manual as well.
Calibration notification
We notify that the instruments included in this manual are in compliance with the features and specifications
as stated in this manual. Before shipment, the instrument has been calibrated in factory. The calibration
procedures and standards are compliant to the national regulations and standards for electronic calibration.
Warranty
We guarantee that the instrument has been passed strict quality check. We warrant our instrument’s
mainframe and accessories in materials within the warranty period of one year. We guarantee the free spare
parts for products which are approved defective in this period. To get repair service, please contact with your
nearest sales and service office. We do not provide any other warranty items except the one being provided
by this summary and the warranty statement. The warranty items include but not being subjected to the hinted
guarantee items related to tradable characteristics and any particular purpose. We will not take any
responsibility in cases regarding to indirect, particular and ensuing damage, such as modifications to the
circuit and functions by the users, repairing or component replacement by the users, or damage during
transportation.
For product improvement, the specifications are subject to change without prior notice.
III
Chapter1 General Introduction
This Series programmable electronic load, as a new generation product, is designed with high performance. It
provides you powerful test function, user-friendly HMI, as well as RS232 interface to support SCPI and
Labview. This Series is widely used in aerospace, shipbuilding, automotive electronics, solar cell, and fuel cell
etc. scientific research and production field.
All “electronic load” and “load” appear in this manual refer to this Series Electronic Load if there is no special
explanation.
1-1. Function Features

4 basic functions: CC, CV, CR and CP; 9 basic test modes: CCL, CCH, CVL, CVH, CRL, CRM, CRH,
CPV, CPC;

The 24 bit A/D and 16 bit D/A converters incorporated, provide this equipment with greatly enhanced
setting and measurement resolution. 40kHz D/A conversion rate fully improves high-speed performance;

Perfect protection assures high reliability in the most complicated of test environments;

Innovative design of CPV and CPC modes effectively improves the practicability of CP mode;

Circuit improvement greatly enhances the dynamic response of CR mode and widens the application
scope of that mode;

High-speed transient operation with separate high/low level time and rising/falling time control, maximum

Powerful sequential test function; with a minimum step time of 10us; and a maximum step time of 10000s.
test frequency 2kHz;
Cyclic numbers can be adjusted freely and a sequence can be chained to another sequence to achieve
even more complex test procedures;

The input binding posts with their innovative design are especially suitable for large current testing;

Provides short-circuit test, battery discharge test and other auxiliary functions;

A high-efficiency, intelligent cooling system can effectively reduce system temperature and enhance
power density;

Automatic ON/OFF function simplifies test operation;

Knobs and digital keypad makes the operation more convenient;

Save/recall function can save multiple groups of general settings;

Supports SCPI (Standard Commands for Programmable Instrumentation) and Labview, and provides
necessary PC software;
1-2. Production Models
Item
Model
Rated Input
Weight
Dimension
Power
Voltage
Current
kg
(W*H*D)
1
A
150W
0~150V
1mA~30A
5.2
215x89x412mm
2
B
300W
0~150V
1mA~30A
6.7
215x89x412mm
3
C
300W
0~150V
1mA~60A
6.7
215x89x412mm
4
D
300W
0~500V
1mA~15A
6.7
215x89x412mm
5
E
600W
0~150V
1mA~60A
9
215x89x507mm
6
F
600W
0~500V
1mA~30A
9
215x89x507mm
-1-
1-3. Front Panel
Fig.1-1 Front Panel
1.LCD display
2.Function buttons
3.Parameters input
4.Input binding posts
5.Menu keys
6.Power switch
1-4. Message of LCD Display
Fig.1-2 Message of LCD Display
-2-
1-5. Rear Panel
Fig.1-3 Rear Panel
1.Power cord / fuse socket
2.Cooling fan
4.External trigger input terminal
5.RS232 interface
3.Remote sense terminal
Fig.1-4 Bottom Panel
1. AC110/220V power selection switch
-3-
1-6. Keypad Function
There are three groups of keypads on the front panel: the Function Keys, the Entry Keys, which composite
with secondary functions, and the Direction Keys. The first functions of the Entry Keys are printed in black.
The secondary functions of the Entry Keys are printed in green. To use the secondary function, please press
“Shift” key first, then press the relevant key.
List 1-1 Key discription
Key name
Main function
Secondary key name
Secondary function
0
Input digit 0
Trigger
Trigger key
1
Input digit 1
Store
Store key
2
Input digit 2
Recall
Recall key
3
Input digit 3
A
Point A setting
4
Input digit 4
Start
Sequence (list) start key
5
Input digit 5
Stop
Sequence (list) stop key
6
Input digit 6
B
Point B setting
7
Input digit 7
Insert
Insert key
8
Input digit 8
Delete
Delete key
9
Input digit 9
Error
Error code display key
·
Input decimal point
Short
Short circuit key
Prot Clear
Clear protection
Enter
Confirm key

Left key

Right key
Tran
Transient operation menu
List
Sequence (list) operation key
Battery
Battery discharge operation key
Set up auxiliary function,auto test
Shift
Switch key for secondary function
Cancel
Clear or exit
Menu
Main menu
On/Off
Input on/off
Lock/Local
Short-press for lock, long-press for unlock
I-set
CC mode selection, the intput current value setting
V-set
CV mode selection, the intput voltage value setting
P-set
CP mode selection, the intput power value setting
R-set
CR mode selection, the intput risistance value setting
↑
Page up
↓
Page down
-4-
1-7. Menus
1-7-1.
Main Menus
Press “Menu” key to enter into main menu and the LCD dispays the selectable menus. Rotate knob to select
menu. Press “Enter” key to enter into the function option on the cursor. Use “↑” key or “↓” key to turn over the
LCD screen. At this time, press “↓” key to enter into the next level submenu. Press “Cancel” key to exit the
menu setting.
List 1-2 Main Menus
System Set
CC SET
Set CC mode range
CV SET
Set CV mode range
CR SET
Set CR mode range
CP SET
Set CP mode range
VON LAtch
Von volgate latch
VON POint
Set Von voltage point
VOFF Point
Set Voff voltage point
CV CURr limit
Current limit in CV mode
CURR Rise rate
Current rise rate in CC mode
CURR Fall rate
Current fall rate in CC mode
SHORT
Short circuit mode
LOAD Default
Restore default
INPUT recall
Set the power-on input status as last power-off status
POWER on recall
Set the power-on relative parameters as last power-off settings
KNOB
Enable knob function
KEY SOund
Enable key sound
BAUD Rate
Software version
PARITY check
Baud rate setting
DATA Bit
Parity check setting
STOP bit
Data bits length
ADDRESs
Stop data bits
SAVE
Store parameters
RECALL
Recall parameters
LOAD Default
Error message
OCP STate
Overcurrent protection On/Off
OCP LEvel
Current preotection limit
OCP DElay
Delay time to turn off the load in OCP
OVP LEvel
Voltage preotection limit
OPP LEvel
Power preotection limit
OPP DElay
Delay time to turn off the load in OPP
FUNCTIon
Trigger function selection
SOURCE
Trigger source setting
Config
Protection
Trigger Set
-5-
CURRENt
Trigger current
VOLTAGe
Trigger voltage
RESISTance
Trigger resistance
POWER
Trigger power
STATE
Set sequence (list) test status
NO.
Select sequence (list) number
MEMO
Sequence memo
DATA: <New/Edit>
Create a new or edit an existing sequence
COUNT
Cycle times
CHAIN
Sequence number to be chained with (0-7, off)
NO.
Data number
MODE
Mode Time
LEVEL
Setting value
DELAY
Time
STATE
Battery discharge operation key
MIN VOltage
Termination voltage value
IOFF Piont
Termination current value
DISCUR
Discharge current value
STATE
Transient operation status
MODE
Transient operation mode
LEVELL
Transient low level
LEVELH
Transient high level
TIME L
Time for transient low level
TIME H
Time for transient high level
TIME R
Time for transient rising edge
TIME F
Time for transient falling edge
STATE
Auto test state on/off
END STep
End step (0-14)
STEP
Step selection (0-14)
MODE
Mode setting
LEVEL
Setting value
MIN
Parameter minimum value
MAX
Parameter maximum value
DELAY
Test time
List
List data
Battery
Transient
Auto test
Note:

The parameters of Config, Protection, Trigger Set and Auto Test in main menu will be saved
automatically after been modified. The parameter saved in location 0 will be recalled automatically every
time when the load is turned on.

The capital letters of the menu will be shown on the LCD. The numbers of shown characters should not
exceed 6.
-6-
1-7-2.
Mode and Parameter Setting Menu
The electronic load can be excuted in the following modes.
1: Constant Current mode (CC)
2: Constant Voltage mode (CV)
3: Constant Resistance mode (CR)
4: Constant Power mode (CP)
In the basic mode, press corresponding key to enter into mode and parameter setting menu, which is shown
as below:
Key name
Function and parameter
Description
I-SET
SCCL
01.000A
Constant current mode: immediate current level
V-SET
SCVL
80.00V
Constant voltage mode: immediate voltage level
R-SET
SVHCRL
P-SET
SCPV
1-7-3.
02.000R
10.000W
Constant resistance mode: immediate resistance level
Constant power mode: immediate power level
Transient Operation Menu
In the basic mode, turn off the input, press “Tran” key in desired mode to enable its transient operation and
enter into parameters setting menu.
Function
Description
STATE
Transient operation status and enable the function
MODE
Transient operation mode
Continuous: 0 COUNT
Pulsed: 1 PULSE
Toggled: 2 TOGGLE
LEVELL
Transient low level
LEVELH
Transient high level
TIME L
Time for transient low level (0-99999ms), unit is ms
TIME H
Time for transient high level (0-99999ms), unit is ms
TIME R
Time for transient rising edge (0.25-99999ms) , unit is ms
TIME F
Time for transient falling edge (0.25-99999ms) , unit is ms
Note:
Transient operation may be used in CC, CV, and CR modes.
1-7-4.
Sequence (List) Operation Menu
Press “List” key to enter into the list operation menu.
Function
Description
STATE
Enable the function
NO.
Select sequence (list) number 0-7
MEMO
Sequence memo (10 characters)
DATA: <New/Edit>
Create a new or edit an existing sequence
COUNT
Cycle times (1-65535), (Number 0 represents infinite loop)
CHANI: Off
Sequence number to be chained with (0-7 off)
-7-
Press “↑” and “↓” keys in sequence (list) operation menu to select “Data: <New/Edit>”, and select “New” and
“edit” keys with the knob. Then press “Enter” key to enter into sequence data editing status, which is shown as
below:
Function
Description
NO.
Data number (0-49)
MODE
Mode
LEVEL
Setting value
DELAY
Time, unit is s
Press “Cancel” key to store the data and exit.
1-8. Display Messages
1)
CC Mode:
The LCD shows actual voltage, current, power and resistance levels. The second line shows current set
level and CC mode.
2)
CV Mode:
The LCD shows actual voltage, current, power and resistance levels. The second line shows voltage set
level and CV mode.
3)
CR Mode:
The LCD shows actual voltage, current, power and resistance levels. The second line shows resistance
set level and CR mode (CRL indicates constant resistance low range; CRM indicates constant resistance
medium range; CRH indicates constant resistance high range; VH indicates voltage high range; and VL
indicates voltage low range).
4)
CP Mode:
The LCD shows actual voltage, current, power and resistance levels. The second line shows power set
level, CP mode (CPC indicates constant power-current source mode; CPV indicates constant
power-voltage source mode).
5)
Transient Operation:
The LCD shows actual voltage, current, power and resistance levels.
6)
Sequence (List) Operation:
The LCD shows actual voltage, current, power and time. The second line shows set level and sequence
operation mode.
7)
Battery Discharge Operation:
The first line shows actual voltage, current, battery capacity and discharge time.
8)
Short Circuit Operation:
The LCD shows actual voltage, current, power and resistance levels. The second line shows set level in
short circuit mode. Please refer to Main Specifications for details.
-8-
9)
Protection Status
If the protection function is active, the indicator of “Cancel” is turned on, LCD will display corresponding
protection status. For example: the display of reverse voltage protection status is shown as below:
Protection status includes overcurrent (OC), overvoltage (OV), overpower (OP), overtemperature (OT),
load protection (PT), and reverse voltage (RV).
10) Input On/Off
When the indicator of “On/Off” is turned on, the load’s input is in On status; on the contrary, the load’s
input is in Off status.
1-9. Remote Programming
The commands are sent to electronic load via remote interface (RS232), and will be executed after decoding
by the processor. If there is any error occurs to the command, the processor can detect the wrong command
and error type, and it can maintain the status register as well.
When the instrument address is set between 32 and 255, the address value should be added at the haad of
commands. When the instrument address is set higher than 256, the address become invalid, and the
address value does not need to be added at the head of commands.
-9-
Chapter2 Functions and Features
The functions and features of electronic load will be described in this chapter, which helps you to know this
series better.
2-1. Local and Remote Control
This series electronic load can be controlled via the front panel, or by remote controller via remote interface. If
it is needed to control the load via the front panel, the load has to stay in local control status. Local (front panel)
control is in effect immediately after power is applied. Remote control goes into effect as soon as the load
receives a SYSTem:REMote command via RS232.
Under remote control status, the REM annunciator is turned on, all operations on front panel keypad and
knobs become invalid (except “Lock/Local” key). All operations on electronic load are controlled by remote
controller. The electronic load will return to local control and REM remote control annunciator is turned off
after receiving the return command (e.g. : SYST:LOC). Or you can return the electronic load to local control by
long -pressing “Lock/Local” key.
Details of local operation are covered in Chapter Local Operation and fundamentals of remote programming
are given in Chapter Remote Operation. Complete SCPI programming details are given in the “Electronic
Load SCPI Programming Guide”.
2-2. Main Function
Main functions (features) of electronic load:

Constant Current Mode (CCL, CCH)

Constant Voltage Mode (CVL, CVH)

Constant Resisitance Mode (VL CRL, VL CRM, VL CRH, VH CRL, VH CRM, VH CRH)

Constant Power Mode (CPV, CPC)

Transient Operation (Tran)

Sequence (List) Operation (List)

Battery Discharge Operation (Battery)

Shout Circuit Operation (Short)
2-3. Basic Test Function
There are four modes of operation: constant current(CC), constant voltage(CV), constant resistance(CR),
constant power(CP), and nine test modes: CCL, CCH, CVL, CVH, CRL, CRM, CRH, CPV, CPC.
The test mode and the associated parameters can be set via front panel or remote command. The load will
remains in that mode until the mode is changed. If the mode is changed when the load’s input is in ON status,
the load will be turned off automatically.
The set value for electronic load becomes effective immediately when the load is turned on. If the input set
value exceeds the allowed range, it will be automatically limited at maximum value or minimum value.
- 10 -
2-3-1.
Constant Current Mode (CC)
Constant current mode has two ranges, the high range(CCH) and the low range(CCL). The high range
provides wider test range. The low range provides better resolution at low current settings. In CC mode, the
load will sink a current in accordance with the programmed value regardless of the input voltage(see fig.2-1).
Press “I-set” key in basic mode to enter into CC mode selection and parameter setting menu. Input the current
level via the Entry keys or the knob with “” and “” keys. Use “Enter” key for confirmation. The CC mode
and parameters can also be set via remote command (MODE CCL, MODE CCH, CURRent <NRf+>).
Fig. 2-1 CC Mode
2-3-1-1. Setting Ranges
In constant current low range (CCL) and in constant current high range (CCH), please refer to “Main
Specifications” for the current setting range. If the range is changed in CC mode while the load’s input stays
ON status, the load will be turned off automatically. For example: when the load is switched from CCL to CCH,
the input will be turned off. Besides, it is noted that the current set level may have changed to fit the new range
when the current range is changed. For example: the present setting is CCH 20.000A, when the load is
switched from CCH to CCL, the current set level will change to the set level for CCL.
2-3-1-2. Immediate Current Level
The immediate current level refers to the current set value in CC mode, which can be set via pressing “I-set”
key to enter into mode selection and parameter setting menu, or via remote command (CRRRent<NRf+>).
The immediate current level can also be modified directly with left/right keys (“” , “”) and the knob.
2-3-1-3. Triggered Current Level
The triggered current level refers to the preset current value, which can become immediate current level
automatically when a trigger is received. If the CC mode and the input are enabled, the input will be updated
immediately when a trigger occurs. If the CC mode is not active, this current level will have no effect on the
input until the CC mode becomes active.
The triggered current level can be set via entry keys or remote command (CURRent:TRIGgered <NRf+>).
Once a current level is triggered, subsequent triggers will become invalid until another (CURRent:TRIGgered
<NRf+>) command is received. The trigger sources available to the load will be described in later chapter.
The electronic load has a status register, which can keep track of pending triggers and other operating
conditions. This status register will be described in details in the “Electronic Load SCPI Programming Guide”.
- 11 -
2-3-1-4. Transient Current Level
The load will switch between the transient high current level (LevelH) and transient low current level (LevelL)
when the transient operation is enabled. The transient current level can be set in transient operation menu
from the front panel, or via remote command (CURRent:HLEV <NRf+>, CURRent:LLEV <NRf+>).
2-3-1-5. Software Current Limit
The electronic load allows the user to set a current limit via pressing corresponding key or remote command
(CURRent:PROTection <NRf+>). The load will be turned off with beeping alarms if the current limit is
exceeded beyond a programmable time delay (0.001-60s). Please note that the software current limit is in
effect for any mode of operation.
2-3-2.
Constant Voltage Mode (CV)
In CV mode, the load will attempt to sink enough current to control the source voltage to the programmed
value regardless of the input current (see fig.2-2). Press “V-set” key in basic mode to enter into CV mode
selection and parameter setting menu. Input the voltage value via the Entry keys or the knob with “” and “”
keys. Use “Enter” key for confirmation. The CV mode and parameters can also be set via remote command
(MODE CV, VOLTage <NRf+>).
Fig. 2-2 CV Mode
2-3-2-1. Setting Ranges
Please refer to “Main Specifications” for details of the voltage setting ranges.
2-3-2-2. Immediate Voltage Level
The immediate voltage level refers to the voltage set value in CV mode, which can be set via pressing “V-set”
key to enter into mode selection and parameter setting menu, or via remote command (VOLTage <NRf+>).
The immediate current level can also be modified directly with left/right keys (“”, “”) and the knob.
2-3-2-3. Triggered Voltage Level
The triggered voltage level refers to the preset voltage value, which can become immediate voltage level
automatically when a trigger is received. If the CV mode and the input are enabled, the input will be updated
immediately when a trigger occurs. If the CV mode is not active, this voltage level will have no effect on the
input until the CV mode is active.
- 12 -
The triggered voltage level can can be set via entry keys or remote command (VOLTage:TRIGgered<NRf+>).
Once a voltage level is triggered, subsequent triggers will become invalid until another (VOLTage:TRIGgered
<NRf+>) command is received. The trigger sources available to the load will be described in later chapter.
The electronic load has a status register, which can keep track of pending triggers and other operating
conditions. This status register will be described in details in the “Electronic Load SCPI Programming Guide”.
2-3-2-4. Transient Voltage Level
The load will switch between the transient high voltage level (LevelH) and transient low voltage level (LevelL)
when the transient operation is enabled. The transient voltage level can be set in transient operation menu
from the front panel, or via remote command (VOLTage:HLEVel <NRf+>, VOLTage:LLEVel <NRf+>).
2-3-3.
Constant Resistance Mode (CR)
Constant resistance mode has six ranges: the low level (VL CRL), medium level (VL CRM), high level (VL
CRH) of the low voltage range and the low level (VH CRL), medium level (VH CRM), high level (VH CRH) of
the high voltage range. In CR mode, the load will sink a current linearly proportional to the input voltage in
accordance with the programmed resistance to make I=U/R (see fig.2-3). Press “R-set” key in basic mode to
enter into CR mode selection and parameter setting menu. Input the resistance value via the Entry keys or the
knob with “” and “” keys. Use key “Enter” for confirmation. The CR mode and parameters can also be set
via remote command (MODE VLCRL, MODE VLCRM, MODE VHCRH, RESistance <NRf+>).
Fig. 2-3 CR Mode
2-3-3-1. Setting Ranges
In constant resistance low range (CRL), medium range (CRM), and high range (CRH), the resistance setting
range is in “Main Specifications” section. If the range is changed in CR mode while the Load’s input stays ON
status, the load will be turned off automatically. For example: when the load is switched from CRL to CRH, the
input will be turned off. Besides, it is noted that the resistance set level may have changed to fit the new range
when the resistance range is changed. For example: the present setting is CRM 10.000Ω, when the load is
switched from CRM to CRL, the resistance set level will change to the maximum level 1.5000Ω for CRL.
2-3-3-2. Immediate Resistance Level
The immediate resistance level refers to the resistance set value in CR mode, which can be set via pressing
“R-set” key to enter into mode selection and parameter setting menu, or via remote command (RESistance
<NRf+>). The immediate resistance level can also be modified directly with left/right keys (“”, “”) and the
knob.
- 13 -
2-3-3-3. Triggered Resistance Level
The triggered resistance level refers to the preset resistance value, which can become immediate resistance
level automatically when a trigger is received. If the CR mode and the input are enabled, the input will be
updated immediately when a trigger occurs. If the CR mode is not active, this resistance level will have no
effect on the input until the CR mode becomes active.
The triggered resistance level can be set via entry keys or remote command (RESistance:TRIGgered
<NRf+>). Once a resistance level is triggered, subsequent triggers will become invalid until another
(RESistance:TRIGgered <NRf+>) command is received. The trigger sources available to the load will be
described in later chapter. The electronic load has a status register, which can keep track of pending triggers
and other operating conditions. This status register will be described in details in the “Electronic Load SCPI
Programming Guide”.
2-3-3-4. Transient Resistance Level
The load will switch between the transient high resistance level (LevelH) and transient low resistance level
(LevelL) when the transient operation is enabled. The transient resistance level can be set in transient
operation menu from the front panel, or via remote command (RESistance:HLEVel <NRf+>,
RESistance:LLEVel <NRf+>).
2-3-4.
Constant Power Mode (CP)
There are two sorts of constant power modes, the Constant Power-Voltage Source mode (CPV) and the
Constant Power-Current Source mode (CPC). The CPV mode is applied to voltage source test, and the CPC
mode is applied to current source test. In CP mode, the load consumes the constant power in accordance
with the programmed value regardless of the changes of external current and voltage (see fig.2-4). Press
“P-set” key to enter into CP mode selection and parameter setting menu. Input the power value via Entry keys
or the knob with “” and “” keys. Use “Enter” key for confirmation. The CP mode and parameters can also
be set via remote command (MODE CPV, MODE CPC, POWer <NRf+>).
Fig. 2-4 CP Mode
Figure 2-5 are the current-voltage curves for several common power supplies. The constant power curve is a
hyperbola in the first quadrant. The constant power curve usually intersects with current-voltage curve at two
points (the CPV point and the CPC point) when the power of the external power supply is larger than the set
power. At the CPV point, the power supply shows the feature of voltage source: the output power will be
increased with increasing current; at the CPC point, the power supply shows the feature of current source: the
output power will be increased with increasing voltage.
- 14 -
This series electronic load can be set at any one of intersection points to operate by the user.
Fig. 2-5 Current-voltage Curve for Normal Power Supply
As CPV adopts advanced slope detection method, this series electronic load only has to test a part of the
current-voltage curve to know whether the two curves (constant power curve and current-voltage curve)
intersect. Therefore, when the set power is larger than the actual power, the external power supply will not be
short-circuited by the load because the power is insufficient. When the load detects that the power of the
external power supply is insufficient, the current will stop to be increased at once, and the load will try to find
constant power point again till the set power is met.
In CPC mode, the load short-circuits at first to detect the constant current level of the external power supply,
and calculate the maximum output power. If the output power is less than the set power, the input will be
turned off immediately; If the output power is larger than the set power, the load will try to find constant power
point again till the set power is met.
2-3-4-1. Setting Ranges
Please refer to “Main Specifications” section for the detailed CPV and CPC setting ranges.
2-3-4-2. Immediate Power Level
The immediate power level refers to the power set value in CP mode, which can be set via pressing “P-set”
key to enter into CP mode selection and parameter setting menu, or via remote command (POWer <NRf+>).
The immediate resistance level can also be modified directly with left/right keys (“”, “”) and the knob.
2-3-4-3. Triggered Power Level
The triggered power level refers to the preset power value, which can become immediate power level
automatically when a trigger is received. If the CP mode and the input are enabled, the input will be updated
immediately when a trigger occurs. If the CP mode is not active, this power level will have no effect on the
input until the CP mode becomes active.
The triggered power level can be set via entry keys or remote command (POWer:TRIGgered <NRf+>). Once
a power level is triggered, subsequent triggers will become invalid until another (POWer:TRIGgered <NRf+>)
command is received. The trigger sources available to the load will be described in later chapter. The
electronic load has a status register, which can keep track of pending triggers and other operating conditions.
This status register will be described in details in the “Electronic Load SCPI Programming Guide”.
- 15 -
2-4. Transient Operation
When the transient operation is enabled, the load periodically switch between two levels (LevelH and LevelL),
which can be applied to test the dynamic characteristics of the power supply. The transient operation can be
executed in the CC, CV, CR modes, and has three operating statuses: Continuous, Pulsed, and Toggled.
Please make sure the sequence (List) operation has been disabled before enabling transient operation.
The parameters associated with transient operation are: low level (LevelL), high level (LevelH), low level time
(TimeL), high level time (TimeH), time for rising edge (TimeR), time for falling edge (TimeF), and operating
mode.
Transient high/low level and corresponding CC, CV, CR modes share one setting range.
Transient test can be turned on and off via key at the front panel or via remote command (TRANsient
ON/OFF). Before you turn on transient test, you should set the load to the desired mode.
Note:
In transient test, the Von point and current limit should be taken into consideration, which may cause the shut
down of the input, so that the transient test is interrupted.
2-4-1.
Continuous Transient Operation
In continuous operation, the load periodically switches between high/low levels. The trigger function has no
effect on this continuous transient operation. The relevant (the associated) parameters such as low level
(LevelL), high level (LevelH), low level time (TimeL), high level time (TimeH), time for rising edge (TimeR),
time for falling edge (TimeF), and continuous transient operation can be set through transient operation menu
or via remote command (CURRent:LLEVel <NRf+>, CURRent:HLEVel <NRf+>, VOLTage:LLEVel <NRf+>,
VOLTage:HLEVel <NRf+>, RESistance:LLEVel <NRf+>, RESistance:HLEVel <NRf+>, TRANsient:LTIMe
<NRf+>,
TRANsient:HTIMe
<NRf+>,
TRANsient:RTIMe
<NRf+>,
TRANsient:FTIMe
<NRf+>,
TRANsient:MODE CONTinuous).
For example: assume that the CCH range is active, and the input is in OFF status, then the transient
parameters should be set as follows:
Press “Tran” key to enter into transient operation;
Set the following parameters in transient operation menu:
State :
On
Mode :
Cont
LevelL :
5.000A
LevelH :
10.000A
TimeL :
0.50ms
TimeH :
0.50ms
TimeR :
0.25ms
TimeF :
0.25ms
Then press “Cancel” to exit transient operation, press “On/Off” key to turn on the input;
Or via remote command to set:
- 16 -
SCPI command
Description
MODE CCH
Sets operating mode
TRAN ON
Enables transient operation
CURR:LLEV 5
Sets transient current low level to 5A
CURR:HLEV 10
Sets transient current high level to 10A
TRAN:LTIM 0.000500
Sets transient low level time to 500us
TRAN:HTIM 0.000500
Sets transient high level time to 500us
TRAN:RTIM 0.000250
Sets the time for transient rising edge to 250us
TRAN:FTIM 0.000250
Sets the time for transient falling edge to 250us
TRAN:MODE CONT
Selects continuous operation
INPUT ON
Turns on the input
Figure 2-6 shows the current waveform of the load: the load’s input current reaches the transient high level
(10A) after 250us duration of rising edge, and remains at 10A for 500us. Then after 250us duration of falling
edge, the input current reaches the transient low level (5A), and remains at 5A for 500us. Repeat it in cycles.
Fig. 2-6 Continuous Transient Operation
2-4-2.
Pulsed Transient Operation
The trigger function is required for pulsed transient operation. When there is no trigger occurs, the load
remains at the transient low level. After a trigger has been received, a pulse will be appeared with rising edge,
transient high level, and falling edge three stages, then the load returns to the transient low level again at last.
The associated parameters such as transient low level (LevelL), transient high level (LevelH), high level time
(TimeH), time for rising edge (TimeR), time for falling edge (TimeF), and pulsed transient mode can be set
through transient operation menu or via remote command (CURRent:LLEVel <NRf+>, CURRent:HLEVel
<NRf+>,
VOLTage:LLEVel
<NRf+>,
VOLTage:HLEVel
<NRf+>,
RESistance:LLEVel
<NRf+>,
RESistance:HLEVel <NRf+>, TRANsient:HTIMe <NRf+>, TRANsient:RTIMe <NRf+>, TRANsient:FTIMe
<NRf+>, TRANsient:MODE PULSe). The low level time (TimeL) has no effect on pulsed transient operation.
In order to get a pulse, an explicit trigger is required. The trigger can be an external trigger signal received via
the TRIG input on the rear panel, pressing the “Shift”+ “0Trigger” keys, the *TRG common command, or the
TRIG subsystem command. The trigger becomes effective only when the load remains at transient low level.
Each trigger leads to one pulse. In the duration of rising edge, transient high level, and falling edge, any
trigger will be ignored.
For example: assume that the CCH range is active, and the input is in OFF status, then the transient
parameters should be set as follows:
Press “Tran” key to enter into transient operation;
Set the following parameters in transient operation menu:
State :
On
Mode :
Puls
- 17 -
LevelL :
5.000A
LevelH :
10.000A
TimeL :
0.50ms
TimeH :
0.50ms
TimeR :
0.5ms
TimeF :
0.5ms
Then press “Cancel” to exit transient operation, press “On/Off” key to turn on the input;
Or via remote command to set:
SCPI command
Description
TRIG:SOUR EXT
Selects the external trigger input
TRAN ON
Enables transient operation
CURR:LLEV 5
Sets transient current low level to 5A
CURR:HLEV 10
Sets transient current high level to 10A
TRAN:HTIM 0.000500
Sets transient high level time to 500us
TRAN:RTIM 0.000500
Sets the time for transient rising edge to 500us
TRAN:FTIM 0.000500
Sets the time for transient falling edge to 500us
TRAN:MODE PULS
Selects pulse trigger operation
INPUT ON
Turns on the input
Get the trigger by receiving an external trigger signal. Figure 2-7 shows the current waveform of the load
before it is triggered and after it has been triggered respectively: the electronic load starts operation at the
transient low level (5A) when the input is turned on. For each trigger, the load current reaches the high level
(10A) after 500us duration of rising edge, and remains at 10A for 500us. Then after 500us duration of falling
edge, the current returns to the transient low level (5A).
Fig. 2-7 Pulsed Transient Operation
2-4-3.
Toggled Transient Mode
The trigger function is required for toggled transient operation. When there is no trigger occurs, the load
remains at a transient level. After a trigger has been received, a toggle operation will be executed, and
another transient level will be reached after the duration of rising edge or falling edge.The associated
parameters such as transient low level (LevelL), transient high level (LevelH), time for rising edge (TimeR),
time for falling edge (TimeF), and toggled transient mode can be set through transient operation menu or via
remote command (CURRent:LLEVel <NRf+>, CURRent:HLEVel <NRf+>, VOLTage:LLEVel <NRf+>,
VOLTage:HLEVel <NRf+>, RESistance:LLEVel <NRf+>, RESistance:HLEVel <NRf+>, TRANsient:RTIMe
<NRf+>, TRANsient:FTIMe <NRf+>, TRANsient:MODE PULSe). The low level time (TimeL) and high level
time (TimeH) have no effect on toggled transient operation.
- 18 -
The trigger can be an external trigger signal received via the TRIG input on the front panel, pressing the
“Shift”+“0Trigger” keys, the *TRG common command, or the TRIG subsystem command.
For example: assume that the CCH range is active, and the input is in OFF status, then the transient
parameters should be set as follows:
Press “Tran” key to enter into transient operation;
Set the following parameters in transient operation menu:
State :
On
Mode :
Togg
LevelL :
5.000A
LevelH :
10.000A
TimeL :
0.50ms
TimeH :
0.50ms
TimeR :
0.50ms
TimeF :
0.50ms
Then press “Cancel” to exit transient operation, press “On/Off” key to turn on the input;
Or via remote command to set:
SCPI command
Description
TRIG:SOUR EXT
Selects the external trigger input
TRAN ON
Enables transient operation
CURR:LLEV 5
Sets transient current low level to 5A
CURR:HLEV 10
Sets transient current high level to 10A
TRAN:LTIM 0.000500
Sets transient low level time to 500us
TRAN:HTIM 0.000500
Sets transient high level time to 500us
TRAN:RTIM 0.000500
Sets the time for transient rising edge to 500us
TRAN:FTIM 0.000500
Sets the time for transient falling edge to 500us
TRAN:MODE TOGG
Selects toggled operation
INPUT ON
Turns on the input
Get the trigger by receiving an external trigger signal. Figure 2-8 shows the current waveform of the load
before it is triggered and after it has been triggered respectively: the electronic load starts operation at the
transient low level (5A) when the input is turned on. For the first trigger, the load current reaches and remains
at the high level (10A) after 500us duration of rising edge. When the second trigger is received, the load
current will reach and remain at the low level (5A) after 500us duration of falling edge. Each trigger leads to
one toggle operation.
Fig. 2-8 Toggled Transient Operation
- 19 -
2-5. Sequence (List) Operation
Besides Transient operation, the electronic load provides more flexible list operation, which can make the load
operate according to the preset sequence and synchronize with external signal.
The list operation allows you to program a series of sequence steps, and the operation mode, the load values,
the duration time for each step can be set. The sequence operation can be executed in the CC, CV, and CR
modes. The minimum duration for each step is 10ms (the duration to 0 indicates the current step is invalid),
and the maximum one is 99999s. The list operation allows to be executed cyclically, and the cycle times can
be set; the different list can be chained so that when one list has been executed, the another chained list will
be enabled, which further perfects the capability of the list test to implement more complicated test task. Each
list can contain 50 steps at most, and the load can store 8 lists.
The associated parameters of list operation can be edited and set through list operation menu or via remote
command. The load provides convenient list editing function. When the user is operating input/edit sequence
step, it is easy to check the previous and subsequent steps, and it is allowed to be edited, inserted, and
deleted immediately, which simplifies the list input operation effectively.
The set value of each step will be automatically saved when exiting from step edit menu, and the other list
parameters will be saved immediately after been edited.
The list operation also can be implemented via the remote command.
Please make sure the transient operation has been disabled before enabling list operation. In list operation, if
the operation mode for next step is different from the present step, the load will automatically have a 5ms
delay after the present step is over to avoid the probable current surge. The load’s input will be turned off
during this 5ms-delay.
Figure 2-9 is a list running diagram for 5 steps. See chapter 4 for detailed information about programming lists
from the front panel.
Fig. 2-9 List Operation
Note:
In list operation, the Von point and current limit level should be taken into consideration, which may cause the
shut down of the input, so that the list operation is interrupted.
- 20 -
2-6. Battery Discharge Operation
The electronic load adopts constant current discharge to test battery capacity. The discharge current,
termination voltage, and termination current can be self-defined. After the input is in ON status, constant
current discharge is excuted and switched to constant voltage discharge automatically when the battery
voltage decreases to the termination voltage. And the battery discharge test will be stopped automatically
when the discharge current is less than the termination current.
The test procedure is shown as figure 2-10. The load can real-time display battery voltage, discharge current,
discharge time, and discharge capacity during the test. The maximum battery discharge time is 99hours
99minutes 99 seconds.
Fig. 2-10 Voltage/Current Curve Chart in Battery Discharge Operation
2-7. Short Circuit Operation
The electronic load can simulate a short circuit to test the protection performance of the tested device. The
short circuit operation can be enabled and disabled by setting in the main menu, or via the remote command
(INPut:SHORt ON/OFF). When the short circuit operation is enabled, the relevant short-circuit value depends
on the present mode of the load. See “Main Specifications” section for details.
The other set values will not be changed when the short circuit operation is enabled.
Note:
In short circuit operation, the Von point and current limit level should be taken into consideration, which may
cause the shut down of the input, so that the short circuit operation is interrupted.
- 21 -
2-8. Triggered Operation
The triggered operation is mainly used to make the load keep synchronized with other test equipments or
events. This series electronic load provides various triggering modes, which can be applied to the following
occasions:

Triggering a preset level
Transfers all pending preset levels to the immediate levels. For the presently active mode, the new level
will appear at the input at once if the input is turned on. For the modes which are not presently active, the
preset levels will not take effect at the input until the corresponding mode becomes active.

Triggering a transient pulse
Gernerates a transient pulse in accordance with the preset transient parameters, when pulsed transient
operation is active.

Triggering a transient toggle
Switches the input between the transient low level and transient high level in accordance with the preset
transient parameters, when the toggled transient operation is active.

Triggering a list test
Enables the present list test when the list operation is active.
Three triggering methods are available for remote control: the *TRG and TRIGger commands. The External
trigger input terminal and “Shift”+“0Trigger” key on the front panel of the load can be used to trigger(can
generates a trigger signal to the electronic load).
The load has three triggering modes: BUS, EXTernal, and HOLD.

The BUS mode: the trigger source is *TRG command.

The EXTernal mode: Choose the External trigger input terminal or “Shift”+“0Trigger” key on the front panel
as the trigger source. The input signal at the External trigger input terminal is TTL, the falling edge (signal)
is triggered(can generates a trigger signal to the electronic load).

The HOLD mode: Use the command TRIGger:IMMediate as the trigger source. At this time, all other
triggering methods including *TRG become invalid.
Note:
The command TRIGger:IMMediate can be used in all three triggering modes. The triggering modes can be
selected
via
the
remote
command
only
(TRIGger:SOURce
BUS;
TRIGger:SOURce
EXTernal;
TRIGger:SOURce HOLD).
2-9. Input Control
2-9-1.
Turn On/Off the Load
The input can be turned on/off by pressing “On/Off” key, or via the remote command (INPUT ON/OFF). When
input is in Off status, press “On/Off” to turn on the input of load and the indicator of “On/Off” is turned on;
When input is in On status, press “On/Off” to turn off the input of load and the indicator of “On/Off” is turned off;
Turning the input on/off does not affect the programmed settings.
In local control, if the input is turned on, the load status can not be switched directly among the basic modes,
transient operation, list operation and battery discharge operation etc.. The load can be switched from one
operation status to another operation status only when the input is turned off.
In remote control mode, it is better to send the command “INPUT ON/OFF” in the end to turn on the load.
- 22 -
2-9-2.
Von Point / Voff Point / Von Latch
When the rising speed or falling speed of tested power supply is slow, the load maybe protect the tested
power supply. The load provides functions of Von Point and Voff Point. When the voltage of tested power
supply goes up untill exceeds the Von Point, the load starts Von test. Once the voltage of tested power supply
is more than the Voff Point,the voltage will drop down till less than the Voff Point, at this time, the load is in
Voff status and the input is in Off status.
When the external input voltage is less than the Von Point, the load will not be enabled even though the input
has been turned on. The load will be enabled till the external input voltage reaches or exceeds the Von Point.
Von Latch is used to latch the active status of the load. If the Von Latch function is enabled, once the input
voltage reaches Von Point, the input will be turned on, and stay in ON status regardless of the changes from
the external input voltage, even though the input voltage is less than the Von point. Please see figure 2-11;if
the Von Latch function is disabled, once the input voltage reaches Von Point, the input will be turned on
automatically, and once the input voltage is less than the Von Point, the input will be automatically turned off.
Please see figure 2-12. The automatically turning on /off of the input can be implemented via setting the Von
Point and Von Latch, which simplifies test operation greatly.
The Von Voltage can be set in main menu, or via the remote command (INPut:VOLTage:ON <NRf+>).
The Voff Voltage can be set in main menu, or via the remote command (INPut:VOLTage:OFF <NRf+>).
The Von Latch can be set in main menu, or via the remote command (INPut:VOLTage:ON:LATCh ON/OFF).
Fig. 2-11 Von Latch Is Enabled
Fig. 2-12 Von Latch Is Disabled
Note:
If the load is unable to operate normally, please check the setting of Von Point and Voff Point.
- 23 -
2-9-3.
Current Limit in CV Mode
The CV Curr Limit is used to limit the maximum input current in CV mode. If the voltage is still larger than the
set level while the current limit has been reached, the load will switch to the CC mode. Please see figure 2-13.
The input will not be turned off in the CV current limit, which is different from the software current limit.
The CV Curr Limit can be set in main menu, or via the remote command (CV:CURRent:LIMIt <NRf+>).
Fig.2-13 CV Curr Limit
2-9-4.
Current Rise Rate
The Current Rise Rate is used to set the current rise rate in CC mode. It can be set in main menu, or via the
remote command (CURRent:RISE:RATE <NRf+>).
If the current rise rate is 0.1A/us, and the current set level is 20A, then the current rise rate is shown as below
when the input is turned on:
Fig.2-14 Current Rise Rate
Note:
The Current Rise Rate can be effective only in CCH and CCL, and the set level is 10 times larger than the
maximum current rise rate in CCL.
- 24 -
2-9-5.
Current Fall Rate
The Current Fall Rate is used to set the current fall rate in CC mode. It can be set in main menu, or via the
remote command (CURRent:FALL:RATE <NRf+>).
If the current fall rate is 0.1A/us, and the current set level is 20A, then the current rise rate is shown as below
when the input is turned off:
Fig.2-15 Current Fall Rate
Note:
The Curr Fall Rate can be effective only in CCH and CCL mode, and the set level is 10 times larger than the
actual current fall rate in CCL.
2-10.
Measurement Function
The electronic load has measurement system with high resolution. The input current level and voltage level
can be measured in real time. The input power level and resistance level can be computed with the input
voltage level and current level. Each measured value can be checked through LCD display or via the
command (MEASure).
2-11.
Saving and Recalling
The electronic load is provided with a EEPROM memory, which can save various parameters, such as modes,
input status, current, voltage, resistance, transient settings, and limits etc.. This Series electronic load can
save 10 groups of parameters. All parameters relevant to saving and recalling operation are listed in list 2-1.
The 10 groups of parameters stored in location 0~9 can be saved and recalled by pressing “1Store” and “2Recall”
keys, or via the remote command (*SAV < NRl > and *RCL < NRl >).
The parameter saved in location 0 will be recalled automatically every time when the load is turned on.
List 2-1
Function
Effect
Input
Input status
Mode
Operation mode
CCL Current level
CCL immediate current level
CCH Current level
CCH immediate current level
Current rise rate
Current rise rate
Current fall rate
Current fall rate
Current Hlevel
Transient current high level
- 25 -
Current Llevel
Transient current low level
Current protection level
Current protection limit
Current protection delay
Current protection delay
Current protection State
Enable/disable current protection
CVL Voltage level
CVL immediate voltage level
CVH Voltage level
CVH immediate voltage level
Voltage protection level
Voltage protection limit
Power protection level
Power limit
CV current limit
Current limit in CV mode
Voltage Hlevel
Transient voltage high level
Voltage Llevel
Transient voltage low level
CRL Resistance level
CRL immediate resistance level
CRM Resistance level
CRM immediate resistance level
CRH Resistance level
CRH immediate resistance level
Resistance Hlevel
Transient resistance high level
Resistance Llevel
Transient resistance low level
CPV Power level
CPV immediate power level
CPC Power level
CPC immediate power level
Transient operation
Transient test
Transient mode
Transient mode
Transient Htime
Time for transient high level
Transient Ltime
Time for transient low level
Transient Rtime
Time for transient rising edge
Transient Ftime
Time for transient falling edge
Trigger Function
Trigger function selection
Trigger source
Trigger source
Battery Mode
Battery discharge operation
Battery mini voltage
Battery discharge termination voltage
Battery discharge current
Battery discharge current
Voltage on Latch
Latch the Von point
Voltage on
Von point for the load
Voltage off
Voff point for the load
- 26 -
2-12.
Reading Remote Programming Errors
The Err annunciator will be turned on when remote programming errors occur. The error codes are shown as
followings:

-1xx Command errors

-2xx Execution errors

-3xx Device-specific errors

-4xx Query errors
The remote command (SYSTem:ERRor?) can reads back the error codes and error messages when it is in
remote control.
All errors are saved in one error queue. The errors in this error queue are read in the order in which they
occurred. At most 20 error messages can be saved in the error queue. If the occurred errors exceed 20, the
last error in the error queue will be replaced with -350, “Queue overflow”. The load will not save any additional
error message, unless you clear or read errors from the queue. Once the error message is read, it will be
cleared in the error queue.
2-13.
Status Report
The electronic load incorporates a status reporting register. Various status conditions of the load can be
reported by querying the status register. The user can make sure which event has been reported through
setting the enable register (It will be introduced in details in “ElectronicLoad SCPI Programming Guide”.).
2-14.
Protection Function
The electronic load is equipped with the following protection functions:

Overvoltage (OV)

Overcurrent (OC)

Overpower (OP)

Overtemperature (OT)

Reverse Voltage (RV)
Once any of the above protection functions is active, the corresponding status bit in the status will be set; the
input will be turned off with beeps; the annunciator of “Cancel” will be turned on, the display will show PT to
indicate protection status the detected conditions will be displayed; the load will enter into the latched
protection status, and will not respond to other commands except some specific operations. For example: if
an overtemperature conditions has been detected, the input will be turned off with beeps, and OT will be
shown in the lower right corner of the display. The load will have no response to other operations.
- 27 -
2-14-1.
Clearing Latched Protection
When the load enters into the latched protection status, it will have no response to other commands. The load
will return to the normal operation only when the latched protection has been reset via long pressing the
“Cancel” key or the remote command (INPut:PROTection:CLEar). Of course, the condition that cause the
latched protection must be removed, or it will be latched again as soon as it is reset.
In addition, when the software overcurrent protection is enabled, if the overcurrent time does not exceed the
specified protection time, the indicator of “Cancel” will be turned on, but the input will not be turned off. At this
time, you can reset the overcurrent time via long-pressing “Cancel” key or the remote command
(INPut:PROTection:CLEar).
2-14-2.
Over Voltage
When the input voltage exceeds the predetermined voltage, the overvoltage protection will be enabled, and
the input is turned off with OVP displayed, meanwhile, the OV and VF status register bits are set, and will
remain set until they are reset and overvoltage condition is removed.
2-14-3.
Over Current
The electronic load allows the user to define a current protection limit. When the defined current limit is
exceeded, the overcurrent timer starts timing, and the indicator of “Cancel” will be turned on, but the input will
not be turned off immediately. When the specified delay time is reached, the overcurrent protection will be
enabled and the input is turned off with OCP displayed, meanwhile, the OC and PS status register bits are set,
and will remain set until they are reset and overcurrent condition is removed. The current protection limit
function can only be set via the entry key from the front panel and the remote command. It is turned on/off with
the command (CURRent:PROTection:STATe ON/OFF). The current limit level is set with the command
(CURRent:PROTection < NRf+>). The specified delay time to turn off the input can be set with the command
(CURRent:PROTection:DELay < NRf+>).
2-14-4.
Over Power
The electronic load provides software overpower protection function.
Once the input power exceeds the maximum rated power, the load will compute the present actual power. The
overpower protection will become active as long as the overpower time exceeds the specified limit.
When the overpower protection is enabled, the input will be turned off with OPP displayed, meanwhile, the OP
and PS status register bits are set, and will remain set until they are reset and overpower condition is
removed.
2-14-5.
Over Temperature
If the internal temperature of the load exceeds safe limits, the overtemperature protection will be enabled; the
input will be turned off with OTP displayed, in the meantime, the OT and PS status register bits are set, and
will remain set until they are reset and overtemperature condition is removed. You must wait until the load
cools down to the normal temperature before you can reset the latched protection. The fans in the load will
help to cool the load as quickly as possible.
- 28 -
2-14-6.
Reverse Voltage
When reverse voltage is applied, the reverse voltage protection will be enabled; the input will be turned off
and the indicator of “Cancel” is turned on, in the meantime, the RV and VF status register bits are set, and will
remain set until they are reset and reverse voltage is removed.
2-15.
Auxiliary Functions
2-15-1.
Trigger Function Selection
The Trigger Function in Trigger Set menu is used to select the trigger object. Selecting “Tran” is used to
trigger transient operation, and selecting “List ” is used to trigger sequence (list) operation.
2-15-2.
Knob Function
The Knob in Config menu is used to enable/disable the knob function. Select On to enable the knob function,
and select Off to disable.
2-15-3.
Key Sound
The Key Sound in Config menu is used to enable/disable the key sound. Select On to enable the key sound,
and select Off to disable.
- 29 -
Chapter3 Installation
3-1. Initial Check
When you receive the load, please check it for any obvious damage that may have occurred during shipment.
Keep the original packing materials in case the load has to be returned to factory in the future.
Please confirm that there are no broken keys or knobs, that the cabinet and panel surfaces are free of dents
and scratches, and that the display is not scratched or cracked.
3-2. Environment/Installation Location
The load can operate at its full power within the temperature range of 0 ℃ to 40 ℃, and at derated power from
40 ℃ to 55 ℃, or the overtemperature protection will be caused.
Place the load in a location with good ventilation, and keep a distance from electromagnetic interference. Do
not place the load in the flammable atmosphere.
Your load must be installed in a location that allows sufficient space at the sides and rear of the load for
adequate air circulation. The fans cool the load by drawing in air through the sides and exhausting it out the
back. The rubber bumpers must be removed for rack mounting.
3-3. Power-On/ Self-Test
A power-on self-test can inspect the basic operations of the load to assure you that the load is operational.
First, check AC power-line voltage to verify the power-line voltage selected by 110V/220V power selection
switch on the bottom panel is in accordance with the proper voltage in your local place.
Connect the power-line cord and turn on the load. After around 20 minutes’warm-up of the load, the following
test can be executed:
Connect the output of a power supply to the load’s input with correct polarity to execute CCH 5A and CVH 5V
operations. If the load works normally, it will draw 5A or set input voltage to 5V within the allowed tolerance.
- 30 -
3-4. Connections on the Rear Panel
The rear panel is shown as fig. 3-1, which mainly includes AC input part, external trigger input terminal,
remote sensing terminal and communication interface part. The AC input part includes AC input socket, Fuse
holder, and Line voltage switch on the bottom of panel. The interface part includes RS232 interface.
Fig. 3-1
AC Input:
AC power-line cord must be appropriate for your local standard.
The specifications of the fuse: 110V: 250V 500mA; 220V: 250V 300mA;.
Line voltage switch can switch the voltage from 110V to 220V. The selected voltage should be in accordance
with the proper voltage in your local place.
RS-232 Interface:
The load provides a RS-232 interface, which is a standard DB9 pin connector. The pin assignment is shown
as below:
Pin
Input/Output
1
-
Description
2
Input
RXD: Receive data
3
Output
TXD: Transmit data
4
-
5
Common
6
-
Not used
7
-
Not used
8
-
Not used
Not used
Not used
GND: Ground
9
Not used
The interface parameters can be set in the Menu, you can use SCPI language for programming to realize the
communication with the load.
TRIGGER Connections:
The external trigger input terminal on the rear panel is a BNC connector, in which the middle part is the input+,
and the outer casing is the input-. It receives 5V TTL-compatible falling-edge trigger signals.
Remote Sense:
Remote sensing is a BNC connector, in which the middle part is the SENSE+, and the outer casing is the
SENSE-. It compensates for the voltage drop caused by the power supply and input wire resistance to
achieve greater accuracy. The load can detect voltage inputs automatically, so there is no need to modify the
parameter settings or change the hardware wiring when using remote sensing.
- 31 -
3-5. Connections on the Front Panel
The terminals on the front panel are input terminals (INPUT+, INPUT-). See Fig. 3-2.
Fig. 3-2
Input Connections:
Input connections are made to two binding posts (INPUT+, INPUT-) on the front panel. The maximum wire
diameter is 4mm. In order to enhance the test accuracy, and reduce the test error when executing large
current test, it would be better to use thicker wire.
3-6. Wiring
Sense Connections
When greater accuracy of voltage test is needed, it is necessary to connect Sense input, and the load will
switch to Sense status automatically. The relevant wiring is shown as fig.3-3.
Fig. 3-3
Fig. 3-4
Parallel Connections
Figure 3-4 illustrates how two or more loads can be paralleled in CC or CR mode when high power or large
current is needed.
- 32 -
Chapter4 Local Operation
The local operation of the load has been briefly introduced in Chapter2 Functions and Features. In this
chapter, it will be explained in details with examples.
4-1. Local Control
If you need to control the load via operations on the front panel, the load must stay in the local control status.
The load enters into local control status once it is powered on, and preset parameters saved in EEPROM
location 0 will be recalled automatically.
Under remote control status, all operations on front panel keypad and knobs become invalid (except
“Lock/Local” key). When the load receives a remote command (SYST:REM) via RS232, the remote control
goes into effect and Rmt annunciator is turned on. Under remote control status, all operations on electronic
load are controlled by remote controller. The electronic load will return to local control after receiving the
return command (e.g. : SYST:LOC). Or you can return the electronic load to local control by long-pressing
“Lock/Local”key.
4-2. Main Operation on the Front Panel

Connecting to the Power Supply

Turning the Input On/Off

CC Mode

CV Mode

CR Mode

CP Mode

Short Circuit Operation

Continuous Transient Operation

Pulsed Transient Operation

Toggled Transient Operation

Sequence (List) Operation

Battery Discharge Operation

Saving and Recalling Parameters

Clear Protection Settings

Error Messages

Triggered Operation

Main Menu
4-3. Connecting to the Power Supply
Connect the positive pole of the power supply to the INPUT + terminal, and connect the negative pole of the
power supply to the INPUT - terminal. If the input is connected reversely, the RV protection status of the load
will become effective, and please try to connect the power supply to the load again at this time.
After the power supply is correctly connected to the load, long-press “Cancel” key to clear the RV protection
status (the relevant details will be described in “Clearing Protection Settings”).
- 33 -
4-4. Turning the Input On/Off
Press “On/Off” key to turn on or turn off the input.
4-5. Basic Tests
The operating procedures for basic tests are shown as below:
1)
Press “Menu” key to enter into the mode selection and parameter setting menu.
2)
Use Entry keys or use the knob together with “”, “” keys to input set value. Use “Cancel” key to modify
the set value or exit the mode selection and parameter setting menu.
3)
Press“Enter” key to confirm and exit the mode selection and parameter setting menu.
4)
Press “On/Off” key to turn on the load.
4-5-1.
CC Mode
CC Mode includes constant current high range (CCH) and constant current low range (CCL).
Example1: Set the load to CCH and set the current value to 5.12A in CV mode. Turn on the load, and check
the present power value. The operating procedures are shown as below:
Procedures
Operation Descriptions
Display
1
Press “Menu” key to enter into the selectable menu.
MENU 0 SYST
2
Use Entry keys or use the knob to select “0 System Set”,press
CC SET 0 Low
“Enter” key to confirm and enter into System Set.
3
Use Entry keys or use the knob to select “1 High”,press “Enter”
CC Set 1 High
key to confirm.
4
Press “Cancel” key to exit and return to the basic mode.
CVH 05.000V
5
Press “I-set” key to enter into the parameter setting menu. Use
SCCH 05.120A
Entry keys or use the knob together with “” and “” keys to input
the current value to 5.12.
6
Press “Enter” key to confirm and exit the parameter setting menu.
7
Press “On/Off” key to turn on the load.
CCH 05.120A
For the above operating procedures, the corresponding SCPI commands should be:
INPUT
Off
; Turns off the load
MODE
CCH
; Sets the mode
CURR
5.12
; Sets the current value
INPUT
ON
; Turns on the load
Example2: Set the current value to 5.8A in CCH. Turn on the load, and there are two ways to set the current
value.
Solution 1:
Procedures
Operation Descriptions
Display
1
Press “I-set” key to enter into the parameter setting menu.
SCCH 05.120A
2
Use Entry keys or use the knob together with “” and “” keys to
SCCH 05.800A
input the current value to 5.8.
3
Press “Enter” key to confirm and exit the parameter setting menu.
4
Press “On/Off” key to turn on the load.
- 34 -
CCH 05.800A
Solution 2:
Procedures
Operation Descriptions
Display
1
Move the cursor to the hundredths with “” key.
CCH 05.120A
2
Rotate the knob to set the hundredths to 0. (The set value will be
CCH 05.100A
changed when rotating the knob. The set value will become
effective at input at once when the load is turned on.).
3
Move the cursor to the tenths with “” key.
CCH 05. 100A
4
Rotate the knob to set the tenths to 8. (The set value will be
CCH 05. 800A
changed when rotating the knob. The set value will become
effective at input at once when the load is turned on.).
5
Press “On/Off” key to turn on the load.
For the above operating procedures, the corresponding SCPI commands should be:
MODE
CCH
; Sets the mode
CURR
5.8
; Sets the current value
INPUT
ON
; Turns on the load
Note: CCH /CCL will be shown respectively in the lower right corner of the display when the load is in CCH
status or CCL status.
4-5-2.
CV Mode
Example1: Set the load to CCH and set the voltage value to 50V in CVH mode. Turn on the load, and check
the present power value. The operating procedures are shown as below:
Procedures
1
Operation Descriptions
Display
Press “V-set” key to enter into the parameter setting menu. Use
SCVH 50.000V
Entry keys or use the knob together with “” and “” keys to input
the voltage value to 50.
2
Press “Enter” key to confirm and exit the parameter setting menu.
3
Press “On/Off” key to turn on the load.
CVH 50.000V
For the above operating procedures, the corresponding SCPI commands should be:
MODE
CVH
; Sets the mode
VOLT
50
; Sets the voltage value
INPUT
ON
; Turns on the load
Example2: Set the voltage value to 60V in CV. Turn on the load, and there are two ways to set the voltage
value.
Solution 1:
Procedures
Operation Descriptions
Display
1
Press “V-set” key to enter into the parameter setting menu.
CVH 50.000V
2
Use Entry keys or use the knob together with “” and “” keys to
CVH 60.000V
input the voltage value to 60.
3
Press “Enter” key to confirm and exit the parameter setting menu.
4
Press “On/Off” key to turn on the load.
- 35 -
CVH 60.000V
Solution 2:
Procedures
Operation Descriptions
Display
1
Move the cusor to the tenths with “” key.
CVH 50.00V
2
Rotate the knob to set the tenths to 6. (The set value will be
CVH 60.00V
changed when rotating the knob. The set value will become
effective at input at once when the load is turned on.).
3
Press “On/Off” key to turn on the load.
For the above operating procedures, the corresponding SCPI commands should be:
MODE
CVH
; Sets the mode
VOLT
60
; Sets the voltage value
INPUT
ON
; Turns on the load
Note: CVH will be shown in the lower right corner of the display when the load is in CV mode.
4-5-3.
CR Mode
CR Mode includes the low level (VL CRL), medium level (VL CRM), high level (VL CRH) of the low voltage
range and the low level (VH CRL), medium level (VH CRM), high level (VH CRH) of the high voltage range.
Example1: Set the load to VHCRL and set the resisitance value to 1.5Ω. Turn on the load, and check the
present power value. The operating procedures are shown as below:
Procedures
Operation Descriptions
Display
1
Press “Menu” key to enter into the selectable menu.
MENU 0 SYST
2
Use Entry keys or use the knob to select “0 System Set”,press
CC Set 1 High
“Enter” key to confirm and enter into System Set.
3
Select “Syst CR Set” with “↑” and “↓” keys.
CR Set 2 VH High
4
Use Entry keys or use the knob to select “0 Low”,press “Enter” key
CR Set 0 VH Low
to confirm.
5
Press “Cancel” key to exit and return to the basic mode.
CVH 60.000V
6
Press “R-set” key to enter into the parameter setting menu. Use
SVHCRL 1.5000R
Entry keys or use the knob together with “” and “” keys to input
the resistance value to 1.5.
7
Press “Enter” key to confirm and exit the parameter setting menu.
8
Press “On/Off” key to turn on the load.
For the above operating procedures, the corresponding SCPI commands should be:
MODE
VHCRL ; Sets mode
RES
1.5
; Sets the resistance value
INPUT
ON
; Turns on the load
- 36 -
VHCRL 1.5000R
Example2: Set the resistance value to 1.2Ω in VH CRL. Turn on the load, and there are two ways to set the
resistance value.
Solution 1:
Procedures
Operation Descriptions
Display
1
Press “R-set” key to enter into the parameter setting menu.
SVHCRL 1.5000R
2
Use Entry keys or use the knob together with “” and “” keys to
SVHCRL 1.2000R
input the resistance value to 1.2.
3
Press “Enter” key to confirm and exit the mode selection and
VHCRL 1.2000R
parameter setting menu.
4
Press “On/Off” key to turn on the load.
Solution 2:
Procedures
Operation Descriptions
Display
1
Move the cusor to the tenths with “” key.
VHCRL 1.5000R
2
Rotate the knob to set the tenths to 2. (The set value will be
VHCRL 1.2000R
changed when rotating the knob. The set value will become
effective at input at once when the load is turned on.).
3
Press “On/Off” key to turn on the load.
For the above operating procedures, the corresponding SCPI commands should be:
MODE
VH CRL ; Sets mode
RES
1.2
; Sets the resistance value
INPUT
ON
; Turns on the load
Note: CRH /CRM/CRL will be shown respectively in the lower right corner of the display when the load is in
CRH status, CRM status or CRL status.
4-5-4.
CP Mode
CP mode includes constant power-voltage source mode (CPV) and constant power-current source mode
(CPC).
Example1: Set the load to CPV and set the power value to 100W in CRL. Turn on the load, and check the
present power value. The operating procedures are shown as below:
Procedures
Operation Descriptions
Display
1
Press “Menu” key to enter into the selectable menu.
MENU 0 SYST
2
Use Entry keys or use the knob to select “0 System Set”,press
“Enter” key to confirm and enter into System Set.
CC Set 0 Low
3
Select “Syst CR Set” with “↑” and “↓” keys.
CP Set 1 CPC
4
Use Entry keys or use the knob to select “0 CPV”,press “Enter”
key to confirm.
CP Set 0 CPV
5
Press “Cancel” key to exit and return to the basic mode.
VHCRL 1.200R
6
Press “P-set” key to enter into the parameter setting menu. Use
Entry keys or use the knob together with “” and “” keys to input
the power value to 100.
SCPV 100.00W
7
Press “Enter” key to confirm and exit the parameter setting menu.
CPV 100.00W
8
Press “On/Off” key to turn on the load.
- 37 -
For the above operating procedures, the corresponding SCPI commands should be:
MODE
CPV
; Sets mode
POW
100
; Sets the power value
INPUT
ON
; Turns on the load
Example2: Set the power value to 200W in CPV. Turn on the load, and there are two ways to set the power
value.
Solution 1:
Procedures
Operation Descriptions
Display
1
Press “P-set” key to enter into the parameter setting menu.
SCPV 100.00W
2
Use Entry keys or use the knob together with “” and “” keys to
SCPV 200.00W
input the power value to 200.
3
Press “Enter” key to confirm and exit the mode selection and
SCPV 200.00W
parameter setting menu.
4
Press “On/Off” key to turn on the load.
Solution 2:
Procedures
Operation Descriptions
Display
1
Move the cusor to the hundredths with “” key.
CPV 100.00W
2
Rotate the knob to set the hundredths to 2. (The set value will be
CPV 200.00W
changed when rotating the knob. The set value will become
effective at input at once when the load is turned on.).
3
Press “On/Off” key to turn on the load.
For the above operating procedures, the corresponding SCPI commands should be:
MODE
CPV
; Sets mode
POW
200
; Sets the power value
INPUT
ON
; Turns on the load
Note: CPV/CPC will be shown respectively in the lower right corner of the display when the load is in CPV or
CPV mode.
4-6. Short Circuit Operation
The operating procedures for short circuit operation are shown as below:
1)
Press “Menu” key to enter into the selectable menu.
2)
Use Entry keys or use the knob to select “0 System Set”, and press “Enter” key to confirm and enter into
System Set
3)
Select Short (short circuit) item with “↓” key.
4)
Operate all the above steps or press “Shift”+“▪Short” keys to select Short (short circuit) item.
5)
Use Entry keys or knob to set On, and press “Enter” key to confirm.
6)
Press “Cancel” key to exit the main menu. The display shows “s” to indicate in the basic test mode.
7)
Select one basic test mode; press “Enter” key to confirm and exit the mode selection and parameter
setting menu.
8)
Press “On/Off” key to turn on the load.
- 38 -
Example1: The load was in CVH mode previously and it is turned off. Set the load to short circuit in CCH
status. Turn on the load to execute short circuit operation.
Procedures
Operation Descriptions
Display
1
Press “Menu” key to enter into the selectable menu.
MENU 0 SYST
2
Use Entry keys or use the knob to select “0 System Set”, press
CC Set 0 Low
“Enter” key to confirm and enter into System Set.
3
Use Entry keys or use the knob to select “1 High”, press “Enter”
CC Set 1 High
key to confirm.
4
Select Short (short circuit) item with “↓” key.
SHORT 0Off
5
Use Entry keys or knob to set On, and press “Enter” key to confirm.
SHORT 1On
6
Press “Cancel” key to exit the main menu. The display shows “s” to
CVH 0.000V
indicate in CVH mode.
7
Select CCH mode by pressing “I-set” key. press “Cancel” key to
CCH 44.000A
exit the mode selection and parameter setting menu.
8
Press “On/Off” key to turn on the load.
For the above operating procedures, the corresponding SCPI commands should be:
INPUT:SHORT
ON
; Sets the load to short circuit operation
MODE
CCH
; Sets mode
INPUT
ON
; Turns on the load
Example2: Based on the last example, exit the short circuit operation, and turn off the load.
Procedures
1
Operation Descriptions
Display
Press “Menu” key to enter into the selectable menu and the load is
MENU 0 SYST
turned off automatically.
2
Use Entry keys or use the knob to select “0 System Set”, press
CC Set 0 Low
“Enter” key to confirm and enter into System Set.
3
Use Entry keys or use the knob to select “1 High”, press “Enter”
CC Set 1 High
key to confirm.
4
Select Short (short circuit) item with “↓” key.
SHORT 0On
5
Use Entry keys or knob to set Off, and press “Enter” key to confirm.
SHORT 1Off
6
Press “Cancel” key to exit the main menu. On the display, “s”
CVH 0.000V
disappears in CCH status.
For the above operating procedures, the corresponding SCPI commands should be:
INPUT:SHORT
OFF
; Sets the load to exit short circuit operation
INPUT
OFF
; Turns on the load
- 39 -
4-7. Transient Operation
The operating procedures for transient operation are shown as below:
1)
Select one basic test mode, press “Enter” key to confirm and exit the parameter setting menu.
2)
Press “Tran” key to enter into transient operation.
3)
Use “↑”, “↓” keys to select the parameter.
4)
Use Entry keys or use the knob together with “”, “” keys to set values for LevelL, LevelH, TimeL,
TimeH, TimeR, and TimeF. Use Entry keys or knob to set Mode value and set State to On.
5)
Press “Cancel” key to exit the transient operation menu.
6)
Press “On/Off” key to turn on the load.
7)
If it is the pulsed transient operation or the toggled transient operation, one trigger occurs when pressing
“Shift”+“0Trigger” keys or the signal at the trigger input terminal (TRIG IN) is low level.
4-7-1.
Continuous Transient Operation
In continuous operation, the load periodically switches between high/low levels. The relevant parameters
such as low level (LevelL), high level (LevelH), low level time (TimeL), high level time (TimeH), time for rising
edge (TimeR), time for falling edge (TimeF).
Example: Set the load voltage value to periodically switch between 1V and 5V; set the time for rising edge
(TimeR) to 10ms; set high level time (TimeH) to 200ms; set time for falling edge (TimeF) to 20ms; set low
level time (TimeL) to 400ms, and the load is in continuous transient operation. The operating procedures are
shown as below:
Procedures
1
Operation Descriptions
Display
Press “V-set” key to select CVH mode, press “Cancel” key to exit
CVH
04.000V
the parameter setting menu.
2
Press “Tran” key to enter into transient operation.
STATE 0OFF
3
Use Entry keys or use the knob together with “”, “” keys to set
STATE 1ON
State value to “1 On”, press “Enter” key to confirm.
4
Use Entry keys or use the knob to set Mode value to “Cont”,press
MODE 0Cont
“Enter” key to confirm.
5
Use Entry keys or use the knob together with “”, “” keys to set
LEVELL 01.000V
LevelL to 1, press “Enter” key to confirm.
6
Use Entry keys or use the knob together with “”, “” keys to set
LEVELH 05.000V
LevelH to 5, press “Enter” key to confirm.
7
Use Entry keys or use the knob together with “”, “” keys to set
TIMEL 400.00M
TimeL to 400ms, press “Enter” key to confirm.
8
Use Entry keys or use the knob together with “”, “” keys to set
TIMEH 200.00M
TimeH to 200ms, press “Enter” key to confirm.
9
Use Entry keys or use the knob together with “”, “” keys to set
TIMER 010.00ms
TimeR to 10ms, press “Enter” key to confirm.
10
Use Entry keys or use the knob together with “”, “” keys to set
TimeF to 20ms, press “Enter” key to confirm.
11
Press “Cancel” key to exit the transient operation menu.
12
Press “On/Off” key to turn on the load.
- 40 -
TIMER 020.00ms
For the above operating procedures, the corresponding SCPI commands should be:
MODE
CVH
; Sets the mode
TRAN
ON
; Enables the transient operation
VOLT:LLEV
1
; Sets a value to low level
VOLT:HLEV
5
; Sets a value to high level
TRAN:LTIME
0.400
; Sets the low level time to 400ms
TRAN:HTIME
0.200
; Sets the high level time to 200ms
TRAN:RTIME
0.025
; Sets the time for rising edge to 25ms
TRAN:FTIMR
0.025
; Sets the time for falling edge to 25ms
TRAN:MODE
CONT
; Selects the continuous transient operation
INPUT
ON
; Turns on the load
4-7-2.
Pulsed Transient Operation
Example: Assume that the load is in external triggering mode, set the load current value to periodically switch
between 1A and 5A; set the time for rising edge (TimeR) to10ms; set high level time (TimeH) to 200ms; set
time for falling edge (TimeF) to 10ms; the load is in pulsed transient operation, and a trigger occurs at this
time.
Procedures
1
Operation Descriptions
Display
Press “I-set” key to select CCL mode, press “Cancel” key to exit
CCL 04.000A
the parameter setting menu.
2
Press “Tran” key to enter into transient operation.
STATE 1OFF
3
Use Entry keys or use the knob to set State value to “1 On”, press
STATE 1ON
“Enter” key to confirm.
4
Use Entry keys or use the knob to set Mode value to “Puls”, press
MODE
1PULS
“Enter” key to confirm.
5
Use Entry keys or use the knob together with “”, “” keys to set
LEVELL 01.000V
LevelL to 1, press “Enter” key to confirm.
6
Use Entry keys or use the knob together with “”, “” keys to set
LEVELL 05.000V
LevelH to 5, press “Enter” key to confirm.
7
Use Entry keys or use the knob together with “”, “” keys to set
TIMEH 200.00M
TimeH to 200ms, press “Enter” key to confirm.
8
Use Entry keys or use the knob together with “”, “” keys to set
TIMER 040.00M
TimeR to 10ms, press “Enter” key to confirm.
9
Use Entry keys or use the knob together with “”, “” keys to set
TimeF to 10ms, press “Enter” key to confirm.
10
Press “Cancel” key to exit the transient operation menu.
11
Press “On/Off” key to turn on the load.
For the above operating procedures, the corresponding SCPI commands should be:
MODE
CCH
; Sets the mode
TRAN
ON
; Enables the transient operation
CURR:LLEV
1
; Sets a value to low level
CURR:HLEV
5
; Sets a value to high level
TRAN:HTIME
0. 200
; Sets the high level time to 200ms
TRAN:RTIME
0.00025 ; Sets the time for rising edge to 250ms
- 41 -
TIMEF 040.00M
TRAN:FTIME
0.00025 ; Sets the time for falling edge to 250ms
TRAN:MODE
PULS
; Selects the pulsed transient operation
INPUT
ON
; Turns on the load
Trig
; One trigger occurs
4-7-3.
Toggled Transient Operation
Example: Assume that the load is in external triggering mode, set the load resistance value to periodically
switch between 200Ω and 500Ω; set the time for rising edge (TimeR) to10ms; set time for falling edge (TimeF)
to 10ms; the load is in toggled transient operation, and a trigger occurs at this time.
Procedures
1
Operation Descriptions
Display
Press “R-set” key to select CRH mode, press “Enter” key to
VH CRH 100.000R
confirm and exit the parameter setting menu.
2
Press “Tran” key to enter into transient operation.
STATE 1OFF
3
Use the knob to set State value to “1 On”, press “Enter” key to
STATE 1ON
confirm.
4
Use the knob to set Mode value to “Togg”, press “Enter” key to
MODE
2Togg
confirm.
5
Use the knob together with “”, “” keys to set LevelL to 200,
LEVELL 200.00R
press “Enter” key to confirm.
6
Use the knob together with “”, “” keys to set LevelH to 500,
LEVELH 500.00R
press “Enter” key to confirm.
7
Use the knob together with “”, “” keys to set TimeR to 10ms,
TIMER 010.00M
press “Enter” key to confirm.
8
Use the knob together with “”, “” keys to set TimeF to 10ms,
TIMEF 040.00M
press “Enter” key to confirm.
9
Press “Cancel” key to exit the transient operation menu.
10
Press “On/Off” key to turn on the load.
For the above operating procedures, the corresponding SCPI commands should be:
MODE
CRH
; Sets the mode
TRAN
ON
; Enables the transient operation
RES:LLEV
200
; Sets a value to low level
RES:HLEV
500
; Sets a value to high level
TRAN:RTIME
0.010
; Sets the time for rising edge to 10ms
TRAN:FTIME
0.01
; Sets the time for falling edge to 10ms
TRAN:MODE
TOGG
; Selects the toggled transient operation
INPUT
ON
; Turns on the load
Trig
; One trigger occurs
4-8. Sequence (List) Operation
After sequence editing, the operating procedures for enabling and disabling sequence operation are shown
as below:
1)
Press “List” key to enter into sequence operation menu.
2)
Use Entry keys or the knob to set sequence State to On, and press “Enter” key to confirm.
- 42 -
3)
Use Entry keys or the knob together with “↑”, “↓” keys to set list number (No.), and press “Enter” key to
confirm.
4)
Press “Cancel” key to exit sequence operation menu.
5)
Press “Shift”+“4Start” keys to activate sequence operation.
6)
Press “Shift”+“5Stop” keys to stop sequence operation.
The operating procedures for sequence operation are shown as below:
1)
Press “List” key to enter into sequence operation menu.
2)
Use Entry keys or the knob to set sequence State to On, and press “Enter” key to confirm.
3)
Use Entry keys or knob to select list number (No.). Press “Enter” key to confirm and recall the sequency
4)
Use “↓” key to select list memo (Memo).
5)
Use knob and “”, “” keys to edit memo (max. 10 characters).
6)
Use “↓” key to select sequence data (Data:<New/Edit>). Use “”, “” keys keys or knob to select New or
in EEPROM assigned by the sequence number.
Edit operation.
7)
Select “New” operation, and press “Enter” key to enter into data clear screen. Use the knob to select “Yes”
and press “Enter” key to confirm, the data is cleared and meanwhile step edit screen appears. Use “”
key or knob to select “No”, press “Enter” key to confirm, in the meantime the load returns to sequence
(list) test menu.
8)
Select “Edit” operation, and press “Enter” key to enter into step edit screen.
9)
Use “↑”, “↓” keys to select parameters.
10) Use Entry keys or use the knob together with “”, “” keys to input set value; press “Enter” key to
confirm and enter into the next step.
11) If it is needed to modify one step, use “↑”, “↓” keys to select this step. The setting operations for this step
are the same as the operating procedure 9.
12) If it is needed to add one step to the last step, use “↓” key to select the new step. The setting operations
for this new step are the same as the operating procedure 9.
13) If it is needed to insert one step above an edited step, use “↑”, “↓” keys to select this edited step. The LCD
display doesn’t flash at this time, and press “Shift”+“7Insert” keys to insert a new step. The setting
operations for this new step are the same as the operating procedure 9.
14) If it is needed to delete an edited step, use “↑”, “↓” keys to select this step. The LCD display doesn’t flash
at this time, and press “Shift”+ “8Delete” keys to delete. If there is only one step exists, it will exit the step
edit screen.
15) Press “Cancel” key to exit step edit screen, and save the sequence data in EEPROM assigned by the
sequence number.
16) Use “↓” key to select the cycle times (Count); use Entry keys or the knob together with “”, “” keys to
input set value. Press “Enter” key to confirm and save the cycle times (Count) in EEPROM assigned by
the sequence number.
17) Use “↓” key to select “Chain”; use Entry keys (the “Chain” is OFF when the Entry key exceeds 7) or the
knob to input the set value. Press “Enter” key to confirm and save the chain value in EEPROM assigned
by the sequence number.
18) Press “Cancel” key to exit sequence operation menu.
19) Press “Shift”+“4Start” keys to activate sequence operation.
20) Press “Shift”+“5Stop” keys to stop sequence operation.
- 43 -
4-8-1.
Sequence (List) Editing
Example: Edit a new sequence. The sequence number is 0; the sequence Memo is Test Power; the sequence
steps: step1: CCL, 1A, 1s; step2: CCH, 2A, 1s; step3: CVH, 1V, 1s; step4: CRL, 1Ω, 1s; step5: CRH, 200Ω,
1s; the cycle times (Count) for sequence operation is 5; disabling the sequence chain; starting sequence
operation; stopping sequence operation.
Procedures
Operation Descriptions
Display
1
Press “List” key to enter into sequence operation menu.
STATE 0 OFF
2
Use Entry keys or the knob to set sequence State to On, and
STATE 0 ON
press“Enter” key to confirm.
3
Use Entry keys or knob to set list number (No.) to 0. Press “Enter”
NO. 0
key to confirm (recall the sequence in EEPROM assigned by the
sequence number).
4
Use “↓”,“↓” keys to select list memo (Memo).
MEMO Test P
5
Rotate the knob to select the letter “T”.
MEMO Test P
6
Use “” key to move the cursor to the right.
MEMO Test P
7
Rotate the knob to select the letter “e”.
MEMO Test Power
8
Set Memo to “Test Power” according to step5 and setp6
MEMO Test Power
operations. Press “Enter” key to confirm.
9
Use “↑”, “↓” keys to select Data.
DATA 0 New
10
Use the knob to select New, and “Enter” key to confirm.
DATA 0 New
11
Use the knob to select “Yes” and press “Enter” key to confirm, the
CLEAR
1 YES
data is cleared and meanwhile step edit screen appears.
12
Edit the step1: CCL, 1A, 1s. Use “↑”, “↓” keys to select time set
NO
00.
value. Use Entry keys or the knob together with “”, “” keys to
input time to 1s, and press “Enter” key to confirm.
13
Use “↑”, “↓” keys to select the basic mode. Use Entry keys or the
MODE
CCL
knob to select operating mode to CCL, and press “Enter” key to
confirm.
14
Use “↑”, “↓” keys to select the set value. Use Entry keys or the
LEVEL 01.000A
knob together with “”, “” keys to input the current value to 1A,
and press “Enter” key to confirm.
15
Use “↑”, “↓” keys to select the set time. Use Entry keys or the knob
DELAY 01.000S
together with “”, “” keys to input the time value to 1s, and press
“Enter” key to confirm.
16
Repeat the procedures 12 to 14 to set the rest four steps.
17
The five sequence steps have been edited, and there is no need to
edit the step6. Press “Cancel” key to exit step edit screen and save
the sequence data in EEPROM assigned by the sequence
number.
18
Use “↑”, “↓” keys to select “Count”. use Entry keys or the knob
together with “”, “” keys to input “5”. Press “Enter” key to
confirm and save the Count value in EEPROM assigned by the
sequence number.
- 44 -
SAVE
19
Use “↑”, “↓” keys to select “Chain”. use Entry keys (the “Chain” is
COUNT 0005
OFF when the Entry key exceeds 7) or the knob to input “Off”.
Press “Enter” key to confirm and save the Chain value in EEPROM
assigned by the sequence number.
20
Press “Cancel” key to exit sequence operation menu and enter into
CHAIN 0
the sequence operating screen.
21
Press “Shift”+“4Start” keys to activate sequence operation.
22
Press “Shift”+“5Stop” keys to stop sequence operation.
For the above operating procedures, the corresponding SCPI commands should be:
LIST:NUMBer
0
LIST:MEMO
"Test Power" ; Sequence memo is “Test Power”
LIST:ADD
CCL,1,1
LIST:ADD
CCH,2,1
LIST:ADD
CVH,1,1
LIST:ADD
CRL,1,1
LIST:ADD
CRH,200,1
LIST:SAVE
; Recalls the sequence of the number 0
; The above 5 commands are sequence steps
; Saves the sequence
LIST:COUNT
5
; Cycle times for this sequence
LIST:CHAIN
OFF
; Disables the chained sequence
LIST
ON
; Activates sequence operation
LIST
OFF
; Stops sequence operation
4-8-2.
Modifying, Adding, Inserting, Deleting the Sequence (List)
Exampe: Based on the example in 4.8.1 section, the step1: modify the time to 2s. Add “CCH, 5A, 1s” to the
last step. Insert “CRL, 1Ω, 10s” at step3. Delete step2. The sequence is chained to itself to realize the
continuous execution.
Procedures
Operation Descriptions
Display
1
Press “List” key to enter into sequence operation menu.
STATE 1 On
2
Use “↑”, “↓” keys to select Data:<New/Edit>.
DATA 0 New
3
Use the knob to select Edit, press “Enter” to confirm and enter into
DATA 1 Edit
the step edit screen.
4
Use “” key to select time parameter and the time set value.
NO 00
5
Use Entry keys or the knob together with “”, “” keys to input the
DELAY 02.000S
time to 2s, and press “Enter” key to confirm.
6
Use “↑”, “↓” key to select the last new step (Step6).
NO 05
7
Add a new step: CCH, 5A, 1s. Use Entry keys or the knob together
MODE CCH
with “”, “” keys to input time to 1s, and press “Enter” key to
confirm.
8
Use the knob to select operating mode to CCH, and press “Enter”
LEVEL 05.000A
key to confirm.
9
Use Entry keys or the knob together with “”, “” keys to input the
DELAY 01.000S
current value to 5A. Press “Enter” key to confirm and enter into the
next operation.
10
Use “↑”, “↓” keys to select the step3.
- 45 -
NO 02
11
Press “Shift”+“7Insert” keys to insert a new step at step3.
NO 02
12
Insert a new step: CRL, 1Ω, 10s at step3. The setting operations
NO 02
for this new step are the same as the operating procedures7 to 9.
13
Use “↑”, “↓” keys to select the step2.
NO 01
14
Press “Shift”+“8Delete” keys to delete the step2.
NO 01
15
Press “Cancel” keys to exit the step edit screen and save the
DATA 1 Edit
sequence data in EEPROM assigned by the sequence number.
16
Use “↑”, “↓” keys to select chain.
CHAIN Off
17
Use Entry keys or the knob to input 0 (it is chained o itself to
CHAIN 0
realize continuous execution). Press “Enter” key to confirm and
save the Chain value in EEPROM assigned by the sequence
number.
18
4-8-3.
Press “Cancel” key to exit sequence operation menu.
Starting/Stopping the Sequence (List)
Example: Start the No.0 sequence, and stop the active sequence operation.
Procedures
Operation Descriptions
Display
1
Press “List” key to enter into sequence operation menu.
STATE 1 On
2
Use “↓” key to select No..Use Entry keys or knob to set the
No. 0
sequence number (No.) to 0, and press “Enter” key to confirm
(recall the sequence in EEPROM assigned by the sequence
number).
3
Press “Cancel” key to exit sequence operation menu.
4
Press “Shift”+“4Start” keys to activate sequence operation. (the
other operations will be active only when the sequency operation is
disabled.)
5
Press “Shift”+“5Stop” keys to stop sequence operation.
For the above operating procedures, the corresponding SCPI commands should be:
LIST:NUMBer
0
; Recalls the sequence of the number 0
LIST
ON
; Activates sequence operation
LIST
OFF
; Stops sequence operation
- 46 -
4-9. Battery Discharge Operation
Battery discharge operation diagram:
The operating procedures for battery discharge operation are shown as below:
1)
Press “On/Off” key to turn off the load, and connect the tested battery correctly.
2)
Press “Battery” key, set the State to On and enter into battery discharge operation screen.
3)
Use “↑”, “↓” keys to select parameters. Use Entry keys or the knob together with “”, “” keys to input
State, termination voltage value, termination current value and discharge current value. Press “Enter”
key to confirm.
4)
Press “Cancel” key to exit the battery discharge parameters edit screen.
5)
Press “On/Off” key to turn on the load, and start battery discharge operation.
6)
Press “On/Off” key to turn off the load, and stop battery discharge operation.
7)
Press “Cancel” key to clear the discharged time and discharged capacity of the battery.
8)
Press the other function keys or “Cancel” key to exit the battery discharge operation.
Example: Enter into the battery discharge operation; set the termination voltage to 15V, and the discharge
current to 3A; turn on the load, and start the battery discharge operation; turn off the load and stop the battery
discharge operation; clear the discharged time and discharged capacity of the battery; exit the battery
discharge operation.
Procedures
1
Operation Descriptions
Display
Press “On/Off” key to turn off the load, and connect the tested
battery correctly.
2
Press “Battery” key to enter into battery discharge capacity
STATE 0 Off
parameters edit screen.
3
Use Entry keys or the knob to set battery State to On, and press
STATE 1 On
“Enter” key to confirm.
4
Use “↑”, “↓” keys to select parameters to input termination voltage
MIN VO 15.000V
(Mini Volt). Use Entry keys or the knob together with “”, “” keys
to input termination voltage to 15V, and press “Enter” key to
confirm.
5
Use “↑”, “↓” keys to select parameters to input termination current
IOFF P 01.000A
(Mini Curren). Use Entry keys or the knob together with “”, “”
keys to input termination current to 1A, and press “Enter” key to
confirm.
6
Use Entry keys or the knob together with “”, “” keys to input
discharge current to 3A, and press “Enter” key to confirm.
7
Press “Cancel” key to exit the battery discharge parameters edit
screen.
- 47 -
DISCUR 3.000A
8
Press “On/Off” key to turn on the load, and start battery discharge
operation.
9
Press “On/Off” key to turn off the load, and stop battery discharge
operation.
10
Press “Cancel” key to clear the discharged time and discharged
capacity of the battery.
11
Press mode hotkey to exit the battery discharge operation
For the above operating procedures, the corresponding SCPI commands should be:
INPUT
OFF
; Turns off the load
BATTERY
ON
; Activates the battery discharge operation screen
BATT:VOLT:OFF
15
; Sets termination voltage to 15V
BATT:DISC:CURR
3
; Sets termination current to 3A
INPUT
ON
; Turns on the load, and start battery discharge operation
INPUT
OFF
; Turns off the load, and stop battery discharge operation
BATTERY
OFF
; Exits the battery discharge operation
4-10.
Saving and Recalling
The operating procedures for saving and recalling operation are shown as below:
1)
Press “Shift”+“1Store” keys to enter into the saving menu, or press “Shift”+“2Recall” keys to enter into the
recalling menu.
2)
Press Entry keys or the knob to select saving or recalling position.
3)
Press “Enter” key to confirm and exit the saving or recalling menu. If the saving is selected, the values of
List2-1 parameters will be saved in the specified location in EEPROM; if the recalling is selected, the
values of List2-1 parameters should be the values saved in specified location in EEPROM.
Example1: Set the mode to CCL; set the current value to 2A; turn on the load; save the settings in location 0
in EEPROM; the next time the load is turned on, these settings will become the power-on settings.
Procedures
1
Operation Descriptions
Display
Set the mode to CCL, set the current value to 2A; turn on the load
(please refer to 4.5.1 section for detailed operations).
2
Press “Shift”+“1Store” keys to enter into the saving menu.
SAVE 0
3
Press Entry keys or the knob to select the location 0 for saving.
SAVE 0
4
Press “Enter” key to confirm.
For the above operating procedures, the corresponding SCPI commands should be:
MODE
CCL
; Sets the load to CCL status
CURR
2
; Sets the current value to 2A
*SAV
0
; Saves the present settings in location 0 in EEPROM
- 48 -
Example2: Based on the above example, set the mode to CVH; set the voltage value to 40V; recall the values
saved in location0 in EEPROM. The detailed operations are shown as below:
Procedures
1
Operation Descriptions
Display
Set the mode to CVH, set the voltage value to 40V (please refer to
4.5.2 section for detailed operations).
2
Press “Shift”+“2Recall”keys to enter into the recalling menu.
RECALL 0
3
Press Entry keys or the knob to select the recalled location 0.
RECALL 0
4
Press “Enter” key to confirm.
For the above operating procedures, the corresponding SCPI commands should be:
MODE
CVH
; Sets the CVH mode
VOLT
40
; Sets the voltage value to 40V
*RCL
0
; Recalls the values saved in location 0 in EEPROM
4-11.
Clear Protection Settings
The operating procedures for clear protection settings are shown as below:
1)
Eliminate the reason that causes the protection status.
2)
Press “Cancel” keys.
Example1: Clear RV protection of the load. The detailed operations are shown as below:
Procedures
Operation Descriptions
Display
1
Connect the power supply to the load again.
2
Long-press “Cancel” key.
For the above operating procedures, the corresponding SCPI commands should be:
INP:PROT:CLE
4-12.
; Clears the protection status
Triggered Operation
When the triggering mode is EXTernal, the triggered operations are shown as below:
1)
Set trigger object (please see 2.8 section for detailed introduction).
2)
Press “Shift”+“0Trigger” keys or trigger terminal (TRIG IN) to receive low TTL level, and a trigger occurs.
Example: Select “List” for the trigger function to trigger a sequence operation. The sequence is the one
mentioned in Example in 4.8.1 section. The detailed operations are shown as below:
Procedures
1
Operation Descriptions
Select “List” in main menu for the trigger function (please see 4.14.6 section for detailed
introduction).
2
Enter to List operation screen (please see 4.8 section for detailed introduction).
3
Press “Shift”+“0Trigger” keys or trigger terminal (TRIG IN) to receive low TTL level. The load’s
input will change accordingly when the sequence parameters are changed. Pressing
“Shift”+“0Trigger” keys has the same effect as pressing “Shift”+“4Start” keys at this time.
For the above operating procedures, the corresponding SCPI commands should be:
TRIG:FUNC LIST
; Selects “List” for trigger function
TRIG
; A trigger occurs
- 49 -
4-13.
Main Menu
The operating procedures for the main menu are shown as below:
1)
Press “Menu” key to enter into the main menu.
2)
Use Entry keys or the knob to select the menu item.
3)
Use “↑”, “↓”keys to select the parameter; or use Entry keys or the knob together with “”, “” keys to
input set value. Press “Cancel” key to exit modifying the parameter or exit the main menu.
4)
Press “Enter” key to confirm.
5)
Press “Cancel” key to exit the main menu.
4-13-1.
Loading Default Values
Example: Load the default values. The detailed operations are shown as below:
Procedures
Operation Descriptions
Display
1
Press “Menu” key to enter into the selectable menu.
Menu 0 SYST
2
Use Entry keys or the knob to select “1 Config”, press “Enter” key
Menu 1 CONF
to confirm and enter into Config.
3
Use “↑”, “↓” keys to select the parameter menu “Load Defa”. Use
LOAD D 1Yes
Entry key or the knob to select the parameter “Yes”.
4
4-13-2.
Press “Enter” key to confirm and return.
Short Circuit Operation
Example: Short circuit operation in CVL mode. The detailed operations are shown as below:
Procedures
Operation Descriptions
Display
1
Press “Menu” key to enter into the selectable menu.
Menu 0 SYST
2
Use Entry keys or the knob to select “0 System Set”, press “Enter”
CC Set 0 Low
key to confirm and enter into System Set.
3
Use “↑”, “↓”keys to select the menu item “Short”.
SHORT 0 Off
4
Use the knob to set the “Short” to On, and press “Enter” key to
SHORT 1On
confirm.
5
Press “Cancel” key to exit the main menu.
6
Press “V-set” key to select CVL mode, press “Enter” key to confirm
and exit the mode selection and parameter setting menu.
7
Press “On/Off” key to turn on the load.
For the above operating procedures, the corresponding SCPI commands should be:
INPUT:SHORT
ON
; Sets the load to short circuit
MODE
CVL
; Sets the mode
INPUT
ON
; Turns on the load
- 50 -
4-13-3.
Von Point/Von Latch
Example: Set the Von Latch to Off; set Von Point to 1V; turn on the load; This example implements the
automatic on/off of the load’s input, which simplifies the test operations greatly. The detailed operations are
shown as below:
Procedures
Operation Descriptions
Display
1
Press “Menu” key to enter into the selectable menu.
MENU 0 SYST
2
Use Entry keys or the knob to select “0 System Set”, press “Enter”
CC SET 0 LOW
key to confirm and enter into System Set.
3
Use “↑”, “↓”keys to select the menu item “Von Latch”. Use the knob
VON LA 0 Off
to select the parameter “Off”, and press “Enter” key to confirm.
4
Use “↑”, “↓”keys to select the menu item “Von Point”. Use Entry
VON PO 01 .000V
keys or the knob together with “”, “” keys to input the voltage
value to 1V, and press “Enter” key to confirm.
5
Press “Cancel” key to exit the main menu.
6
Press “On/Off” key to turn on the load.
For the above operating procedures, the corresponding SCPI commands should be:
INP:VOLT:ON:LATCH
OFF
; Disables the Von Latch
INP:VOLT:ON
1
; Sets the Von voltage point to 1V
INPUT
ON
; Turns on the load
4-13-4.
Current Limit in CV Mode
Example: Set the load to CVL mode; set the voltage value to 2V; set the current limit value in CV mode (CV
Curr Limit) to 20A; turn on the load. The detailed operations are shown as below:
Procedures
1
Operation Descriptions
Display
Set the mode to CVL, set the voltage value to 2V (please refer to
4.5.2 section for detailed operations).
2
Press “Menu” key to enter into the selectable menu.
MENU 0 SYST
3
Use Entry keys or the knob to select “0 System Set”, press “Enter”
CC SET 0 LOW
key to confirm and enter into System Set.
4
Use “↑”, “↓”keys to select the menu item “CV Curr L”.
CV CUR 120.000A
5
Use Entry keys or the knob together with “”, “” keys to input the
CV CUR 20.000A
current value to 20.000A, and press “Enter” key to confirm.
6
Press “Cancel” key to exit the main menu.
7
Press “On/Off” key to turn on the load.
For the above operating procedures, the corresponding SCPI commands should be:
MODE
CVL
; Sets the mode
VOLT
2
; Sets the volgate value to 2V
CV:CURR:LIM
20
; Sets the current limit value to 20A in CV mode
INPUT
ON
; Turns on the load
- 51 -
4-13-5.
Current Rise/Fall Rate in CC Mode
Example: Set the load to CCH mode, set the current value to 2A; set the current rise rate (Curr Rise Rate) in
CC mode to 0.002A/us; set the current fall rate (Curr Fall Rate) in CC mode to 0.005A/us. The detailed
operations are shown as below:
Procedures
1
Operation Descriptions
Display
Set the mode to CCH,; set the current value to 2A (please refer to
4.5.1 section for detailed operations).
2
Press “Menu” key to enter into the selectable menu.
MENU 0 SYST
3
Use Entry keys or the knob to select “0 System Set”, press “Enter”
CC SET 0 LOW
key to confirm and enter into System Set.
4
Use “↑”, “↓”keys to select the menu item “Curr Rise”. Use Entry
CURR R 0.002A/us
keys or the knob together with “”, “” keys to input the current
rise rate to 0.002A/us, and press “Enter” key to confirm.
5
Use “↑”, “↓” keys to select the menu item “Curr Fall”. Use Entry
CURR F 0.005A/us
keys or the knob together with “”, “” keys to input the current
fall rate to 0.005/us, and press “Enter” key to confirm.
6
Press “Cancel” key to exit the main menu.
7
Press “On/Off” key to turn on the load.
For the above operating procedures, the corresponding SCPI commands should be:
MODE
CCH
; Sets the mode
CURR
2
; Sets the current value to 2A.
CURR:RISE:RATE
0.002
; Sets the current rise rate in CC mode to 0.002A/us
CURR:FALL:RATE
0.005
; Sets the current fall rate in CC mode to 0.005A/us
INPUT
ON
; Turns on the load
INPUT
OFF
; Turns off the load
4-13-6.
Trigger Function Selection
Example: Select “Tran” in trigger function selection (Trig Function).
Procedures
Operation Descriptions
Display
1
Press “Menu” key to enter into the selectable menu.
MENU 0 SYST
2
Use Entry keys or the knob to select “3 Trigger Set”, press “Enter”
MENU 3 TRIG
key to confirm and enter into Trigger Set.
3
Use “↑”, “↓” keys to select the menu item “Function”. Use Entry
keys or the knob to select the parameter “Tran”, and press “Enter”
key to confirm.
4
Press “Cancel” key to exit the main menu.
For the above operating procedures, the corresponding SCPI commands should be:
TRIG:FUNC
TRAN
; Selects transient operation (TRAN) for trigger function
- 52 -
Trig Func 0 Tran
4-13-7.
Knob Function
Example: Enable the knob function.
Procedures
Operation Descriptions
Display
1
Press “Menu” key to enter into the selectable menu.
MENU 0 SYST
2
Use Entry keys or the knob to select “1 Config”, press “Enter” key
MENU 1 CONF
to confirm and enter into Config.
3
Use “↑”, “↓” keys to select the menu item “Knob”. Use Entry keys or
KNOB 1 On
the knob to select the parameter “On”, and press “Enter” key to
confirm.
4
4-13-8.
Press “Cancel” key to exit the main menu.
Key Sound
Example: Enable the key sound.
Procedures
Operation Descriptions
Display
1
Press “Menu” key to enter into the selectable menu.
MENU 0 SYST
2
Use Entry keys or the knob to select “1 Config”, press “Enter” key
MENU 1 CONF
to confirm and enter into Config.
3
Use “↑”, “↓” keys to select the menu item “Key Sound”. Use Entry
KEY SO 1On
keys or the knob to select the parameter “On”, and press “Enter”
key to confirm.
4
4-13-9.
Press “Cancel” key to exit the main menu.
Communication Interface
Example: Select RS232 interface; set the baud rate to 9600; set parity check to None; set data bit to 8; set
stop bit to 2.
Procedures
Operation Descriptions
Display
1
Press “Menu” key to enter into the selectable menu.
MENU 0 SYST
2
Use Entry keys or the knob to select “1 Config”, press “Enter” key
MENU 1 CONF
to confirm and enter into Config.
3
Use “↑”, “↓” keys to select the menu item “Baud Rate”. Use the
BAUD R 2 9600
knob or “”, “” keys to select the parameter “9600”, and press
“Enter” key to confirm.
4
Use “↑”, “↓” keys to select the menu item “Parity Check”. Use the
PARITY 0 None
knob to select the parameter “None”, and press “Enter” key to
confirm.
5
Use “↑”, “↓” keys to select the menu item “Data Bit”. Use the knob
DATA B 0 8bit
to select the parameter “8”, and press “Enter” key to confirm.
6
Use “↑”, “↓” keys to select the menu item “Stop Bit”. Use the knob
to select the parameter “2”, and press “Enter” key to confirm.
7
Press “Cancel” key to exit the main menu.
- 53 -
STOP B 1 2bit
Chapter5 Remote Programming Operation
This Series Electronic Load supports both local operation and remote control. The previous chapter has
introduced how to use the front panel keys and knobs to operate on the load. This chapter will introduce you
to how to use the load from the remote controller. The similarities between local and remote programming will
become apparent as you read this chapter. The intent of this chapter is to help users quickly become familiar
with remote programming operations. Programming examples given in this chapter use the SCPI commands
in their simpliest form. Please refer to the “Electronic Load SCPI Programming Guide” for detailed introduction
of all SCPI commands.
5-1. Communication Interface
RS232 interface is standard. Use the cable shipped with the load to connect the load to a computer correctly.
Set the baud rate, parity, data bit, and stop bit parameters. Set the same parameters in the software on the
computer, and input the right SCPI command to operate the load.
5-2. Remote Control Annunciators
There is a Rmt remote control annunciator on LCD. When the load receives the remote command
(SYSTem:REMote) via RS232 interface, the Rmt remote control annunciator turns on. In remote control status,
all operations on the load are controlled by the remote controller; the front panel keypad and knob has no
effect (except “Lock/Local” key). The R Rmt remote control annunciator turns off and the load returns to the
local control after receiving the command to return to local control (e.g. :SYST:LOC). Or you can return the
load to local control from remote control by long-pressing “Lock/Local” key.
5-3. Sending a Remote Command
You can use the computer to set operation mode and operation parameters remotely for the load.
5-4. Returning Data
The load can return the values of parameter settings, input voltage and current, as well as input power to
computer. It can also return information relating to the internal operation and module identification. For
example: the query command “MEAS:CURR?” asks the load to return the actual input current at the Input
binding posts. Please refer to “Electronic Load SCPI Programming Guide” for detailed information on using
queries. The load stores the response to the query in an output buffer which will hold the information until it is
read by the computer or is replaced with new information.
5-5. Remote Programming Commands
The SCPI commands have many optional key words for the programmer. Getting familiar with these key
words will help you to know the programming better. Most of the commands have a query syntax which allows
the present parameter settings to be returned to the controller. Please refer to “Electronic Load SCPI
Programming Guide” for details. The load’s major functions can be programmed with a relatively few number
of these commands. The following points are important to remember when you are remotely programming CC,
CR, CV, and CP values.
- 54 -
5-5-1.
Basic Operation Modes
The CC, CR, CV, and CP values can be programmed whether or not the associated mode is active. If the
input is turned on, all of the applicable values will take effect at the input when the associated mode is
selected.
5-5-2.
Transient Levels
The transient CC, CV, or CR level must be set to a higher level than the respective low level, or the transient
operation will be disabled.
5-5-3.
Programmable Current Protection
When programmable current protection is enabled, and the programmed current limit and time delay are
exceeded, the load’s input will be turned off.
5-6. CC Mode Example
This example sets the current level to 0.5A, and then reads back the actual current value.
1)
"INPUT OFF"
; Turns off the load’s input
2)
"MODE CCL"
; Selects the CCL mode
3)
"CURR 0.5"
; Sets current value to 0.5A
4)
"INPUT ON"
; Turns on the load’s input
5)
"MEAS:CURR?"
; Measures the actual input current
5-7. CV Mode Example
This example presets the trigger voltage to 5V, and selects the external trigger source.
1)
"INPUT OFF"
; Turns off the load’s input
2)
"MODE CVL"
; Selects the CV mode
3)
"VOLT:TRIG 5”
; Presets the trigger voltage value to 5V
4)
"TRIG:SOUR EXT"
; Selects the external input as the trigger source
5)
"INPUT ON"
; Turns on the load’s input
In this example, when the external trigger signal is received, the input voltage will be set to 5V.
5-8. CR Mode Example
This example sets the current protection limit to 3A, sets the time delay to 10s, sets the resistance level to
10Ω, and reads back the computed power.
1)
"INPUT OFF"
; Turns off the load’s input
2)
"MODE CRM"
; Selects the CRM mode
3)
"CURR:PROT:LEV 3
; Sets the current protection limit to 3A
4)
"CURR:PROT:D EL 10
; sets the time delay to 10s
5)
"CURR:PROT:STAT ON"
; Activates the current protection
6)
"RES 10"
; Sets the resistance level to 10Ω
7)
"INPUT ON"
; Turns on the load’s input
8)
"MEAS:POW?"
; Measures the input power level
- 55 -
5-9. Continuous Transient Operation Example
This example sets CV transient high/low levels, times for transient rising/falling edge, high/low level times,
and parameters for transient operation.
1)
"INPUT OFF"
; Turns off the load’s input
2)
"MODE CVH"
; Selects the CV mode
3)
"VOLT:LLEV 0.5"
; Sets the transient low level to 0.5V
4)
"VOLT:HLEV 1"
; Sets the transient high level to 1V
5)
"TRAN:LTIM 0.010"
; Sets transient low level time to 10ms
6)
"TRAN:HTIM 0.010"
; Sets transient high level time to 10ms
7)
"TRAN:RTIM 0.010"
; Sets the time for transient rising edge to 10ms
8)
"TRAN:FTIM 0.010"
; Sets the time for transient falling edge to 10ms
9)
"TRAN:MODE CONT "
; Selects the continuous transient operation
10) "TRAN ON"
; Activates the transient operation
11) "INPUT ON"
; Turns on the load’s input
5-10.
Pulsed Transient Operation Example
This example selects CV pulsed transient operation, selects the bus as the trigger source, and sets a pulse
width of 1ms.
1)
"INPUT OFF"
; Turns off the load’s input
2)
"MODE CVH"
; Selects the CV mode
3)
"TRIG:FUNC TRAN"
; Selects the transient for trigger function
4)
"TRIG:SOUR BUS"
; Selects the bus as the trigger source
5)
"VOLT:LLEV 0.5"
; Sets the transient low level to 0.5V
6)
"VOLT:HLEV 1"
; Sets the transient high level to 1V
7)
"TRAN:HTIM 0.001"
; Sets transient high level time to 1ms
8)
"TRAN:RTIM 0.000250"
; Sets the time for transient rising edge to 250us
9)
"TRAN:FTIM 0.000250"
; Sets the time for transient falling edge to 250us
10) "TRAN:MODE PULSE "
; Selects the pulsed transient operation
11) "TRAN ON"
; Activates the transient operation
12) "INPUT ON"
; Turns on the load’s input
13) "*TRG"
; *TRG command generates a 1ms high-level pulse at the load’s input
- 56 -
Chapter6 Auto Test Operation
6-1. Main Menu
Press
key to enter into main menu of Auto Test. Rotate knob to select menu. Press “Enter” key to enter
into the function option on the cursor. Use “↑” key or “↓” key to turn over the LCD screen. At this time, press “↓”
key to enter into the next level submenu. Press “Cancel” key to exit the menu setting.
Please see the list below for main menu content:
Trigger set
Function
Source
Trigger function
0 input
input On/Off
1 Level
recall trigger value
2 List
enable List
3 Tran
enable Tran
Trigger source selection
0 External external key trigger (“Shift”+“0Trigger”)
1 Pluse
TTL trigger on the rear panel
2 Bus
the trigger source is *TRG command
3 Hold
use the command “TRIGger:IMMediate” as trigger source
Auto Test
State
Auto test state on/off
End Step
End step (0-14)
Step
Step selection (0-14)
Mode
Mode setting
Level
Setting value
Min
Parameter limit minimum value
Max
Parameter limit maximum value
Delay
Test time
6-2. LCD Display Message
The LCD shows actual voltage, current, power and resistance levels. The second line shows test state and
test steps.
6-3. Function Description
The load has auto test function. Users can set the test mode, setting value, limit value range, test time and
end step. There are two trigger functions: auto trigger and external TTL trigger. In auto trigger mode,when the
external input voltage is more than the Von Point, the trigger will be enabled and the load starts to test; When
the external input voltage is less than the Voff Point, the load will enter into waiting status. In external TTL
trigger mode, short the TTL TRIG IN terminal at the rear panel and the trigger will occur. It can realize that the
multi-output power supply can be tested by more than one load simultaneously. The test has 15 steps, set
step parameters, turn on auto test state, input trigger signal, then start to test. It will display steps, paremeters
and test state. If error occurs, the input will be turned off and remain at the actual step and display the
measurement value, press “Cancel” key to clear the error status.
- 57 -
6-4. Local Operation
6-4-1.
Single Power Supply Test
For example: to test 5V2A power bank, connect the load and start auto test.
Step
Mode
Setting value
Min level
Max level
Description
0
CCL
00.000A
4.500V
5.500V
Test the range of Voff point: 4.8V-5.5V
1
CCL
02.000A
4.500V
5.500V
Test the range of Voff point with load 2A:
4.5V-5.5V
2
CVL
04.500V
01.000A
02.500A
Test the load of 4.5V output:1.0A-2.5A
Detailed steps as below:
Procedures
1
2
3
Operation Descriptions
Display
Set the external trigger as the load’s trigger mode.
SOUTCE 0 EXTE
Set the load’s Von point to 2.0V.
VON PO 02 .000V
Set the load’s Voff point to 1.0V.
VOFF P
Press
key to enter into Auto Test menu.
The indicator of
is turned on afer entering into Auto Test
STATE 1 On
01 .000V
STATE 1 On
menu.
4
Use Entry keys or the knob to set the State to On, and press
STATE 1 On
“Enter” key to confirm.
5
Use “↑”, “↓” keys to select the parameter end step. Use Entry keys
END ST 2
or the knob together with “”, “” keys to input the end step to 2,
and press “Enter” key to confirm.
6
Use “↑”, “↓” keys to select the parameter step. Use Entry keys or
STEP 0
the knob together with “”, “” keys to input the step to 0, and
press “Enter” key to confirm. (This is used for testing Voff point)
7
Use “↑”, “↓” keys to select the parameter mode. Use Entry keys or
MODE 0 CCL
the knob together with “”, “” keys to enter into CCL, and press
“Enter” key to confirm.
8
Use “↑”, “↓”keys to select the parameter setting level. Use Entry
LEVEL 00.000A
keys or the knob together with “”, “” keys to input the setting
level to 0.000A, and press “Enter” key to confirm.
9
Use “↑”, “↓” keys to select the parameter limit minimum value. Use
MIN 04.800V
Entry keys or the knob together with “”, “” keys to input the
minimum value to 4.800V, and press “Enter” key to confirm.
10
Use “↑”, “↓” keys to select the parameter limit maximum value. Use
MAX 05.500V
Entry keys or the knob together with “”, “” keys to input the
maximum value to 5.500V, and press “Enter” key to confirm.
11
Use “↑”, “↓” keys to select the parameter test time. Use Entry keys
DELAY 00001s
or the knob together with “”, “” keys to input the test time to 1s,
and press “Enter” key to confirm.
12
Use “↑”, “↓” keys to select the parameter step. Use Entry keys or
the knob together with “”, “” keys to input the step to 1, and
press “Enter” key to confirm. (This is used for testing the voltage
with load 2A)
- 58 -
STEP 1
13
Use “↑”, “↓” keys to select the parameter mode. Use Entry keys or
MODE 0 CCL
the knob together with “”, “” keys to enter into CCL, and press
“Enter” key to confirm.
14
Use “↑”, “↓” keys to select the parameter setting level. Use Entry
LEVEL 02.000A
keys or the knob together with “”, “” keys to input the setting
level to 2.000A, and press “Enter” key to confirm.
15
Use “↑”, “↓” keys to select the parameter limit minimum value. Use
MIN 04.500V
Entry keys or the knob together with “”, “” keys to input the
minimum value to 4.500V, and press “Enter” key to confirm.
16
Use “↑”, “↓” keys to select the parameter limit maximum value. Use
MAX 05.500V
Entry keys or the knob together with “”, “” keys to input the
maximum value to 5.500V, and press “Enter” key to confirm.
17
Use “↑”, “↓” keys to select the parameter test time. Use Entry keys
DELAY 00002s
or the knob together with “”, “” keys to input the test time to 2s,
and press “Enter” key to confirm.
18
Use “↑”, “↓” keys to select the parameter step. Use Entry keys or
STEP 2
the knob together with “”, “” keys to input the step to 2, and
press “Enter” key to confirm. (This is used for testing the output
current of constant voltage 4.5V)
19
Use “↑”, “↓” keys to select the parameter mode. Use Entry keys or
MODE 2 CVL
the knob together with “”, “” keys to enter into CVL, and press
“Enter” key to confirm.
20
Use “↑”, “↓” keys to select the parameter setting level. Use Entry
LEVEL 04.500V
keys or the knob together with “”, “” keys to input the setting
level to 4.500V, and press “Enter” key to confirm.
21
Use “↑”, “↓” keys to select the parameter limit minimum value. Use
MIN 01.000A
Entry keys or the knob together with “”, “” keys to input the
minimum value to 1.000A, and press “Enter” key to confirm.
22
Use “↑”, “↓” keys to select the parameter limit maximum value. Use
MAX 02.500A
Entry keys or the knob together with “”, “” keys to input the
maximum value to 2.500A, and press “Enter” key to confirm.
23
Use “↑”, “↓” keys to select the parameter test time. Use Entry keys
DELAY 00002s
or the knob together with “”, “” keys to input the test time to 2s,
and press “Enter” key to confirm.
24
Press “Cancel” key to exit auto test parameter edit interface and
enter into auto test waiting interface.
After completing all the above steps, it can enable auto test only by connecting power bank to the load’s input
terminal, doesn’t need keys operation.
- 59 -
6-4-2.
Multi-output Power Supply Test
For example: to test 75W, 5V/6A,+15V/2.3A,-15V/0.5A multi-output power supply, connect the power supply
to load following the fig.6.1.
Fig. 6-1
Test step:
Step
0
1
2
Load number
Mode
Level
Min
Max
Delay
A
CCL
0.000A
15.000V
16.000V
1s
B
CCL
0.000A
15.000V
16.000V
1s
C
CCL
0.000A
15.000V
16.000V
1s
A
CCL
2.300A
14.500V
16.000V
2s
B
CCL
2.300A
14.500V
16.000V
2s
C
CCL
0.500A
14.200V
16.000V
2s
A
CVL
5.000V
6.000A
10.000A
2s
B
CVL
15.000V
2.300A
5.400A
2s
C
CVL
14.500V
0.400A
0.600A
2s
Description
Test Voff Point
Test Von Point in CC
Test Von Point in CV
Detailed operation steps as below:
1)
Load A, to test 5V/6A
Operation Descriptions
Display
Set the external TTL trigger as the load’s trigger mode.
SOURCE 1 Pulse
Set the load’s Von point to 2.0V.
VON PO 02 .000V
Set the load’s Voff point to 1.0V.
VOFF P
2
Press
STATE 1 ON
3
The indicator of
menu.
is turned on afer entering into Auto Test
STATE 1 ON
4
Use Entry keys or the knob to set the State to On, and press
STATE 1 ON
Procedures
1
key to enter into Auto Test menu.
01 .000V
“Enter” key to confirm.
5
Use “↑”, “↓” keys to select the parameter end step. Use Entry keys
or the knob together with “”, “” keys to input the end step to 2,
and press “Enter” key to confirm.
6
Please refer to 6.4.1operation steps, and set parameters
according to table 4-A.
7
Press “Cancel” key to exit auto test parameter edit interface and
enter into auto test waiting interface.
- 60 -
END ST 2
Table 6-A: 5V/6A parameter setting
Step
2)
Mode
Level
Min
Max
Delay
0
CCL
0.000A
5.000V
5.500V
1s
1
CCL
6.000A
4.800V
5.500V
2s
2
CVL
5.000V
6.000A
10.000A
2s
Load B, to test +15V/2.3A
Operation Descriptions
Display
1
Set the external TTL trigger as the load’s trigger mode.
SOURCE 1 Pulse
2
Press
MENU 0 SYST
3
The indicator of
Auto Test menu.
is turned on afer entering into enter into
STATE 1 ON
4
Use Entry keys or the knob to set the State to On, and press
STATE 1 ON
Procedures
key to enter into Auto Test menu.
“Enter” key to confirm.
5
Use “↑”, “↓” keys to select the parameter end step. Use Entry keys
END ST 2
or the knob together with “”, “” keys to input the end step to 2,
and press “Enter” key to confirm.
6
Please refer to 6.4.1operation steps, and set parameters
according to table 4-B.
7
Press “Cancel” key to exit auto test parameter edit interface and
enter into auto test waiting interface.
Table 6-B: +15V/2.3A parameter setting
Step
3)
Mode
Level
Min
Max
Delay
0
CCL
0.000A
15.000V
16.000V
1s
1
CCL
2.300A
14.500V
16.000V
2s
2
CVL
15.000V
2.300A
5.400A
2s
Load C, to test -15V/0.5A
Operation Descriptions
Display
1
Set the external TTL trigger as the load’s trigger mode.
SOURCE 1 Pulse
2
Press
STATE 1 ON
3
The indicator of
Auto Test menu.
is turned on afer entering into enter into
STATE 1 ON
4
Use Entry keys or the knob to set the State to On, and press
STATE 1 ON
Procedures
key to enter into Auto Test menu.
“Enter” key to confirm.
5
Use “↑”, “↓” keys to select the parameter end step. Use Entry keys
or the knob together with “”, “” keys to input the end step to 2,
and press “Enter” key to confirm.
6
Please refer to 6.4.1operation steps, and set parameters
according to table 4-C.
7
Press “Cancel” key to exit auto test parameter edit interface and
enter into auto test waiting interface.
- 61 -
END ST 2
Table 6-C: -15V/0.5A parameter setting:
Step
Mode
Level
Min
Max
Delay
0
CCL
0.000A
15.000V
16.000V
1s
1
CCL
0.500A
14.200V
16.000V
2s
2
CVL
14.500V
0.400A
0.600A
2s
After completing all the above settings, connect the power supply to the load’s input terminals according to
Fig.6-1. The trigger signals of the three loads should be connected on the one key. Press the key to start
testing, the first step is to test the rang of Voff point, the second step is to test the rang of Von point. When the
test has been finished, remove the power supply and the load will enter into the waiting status.
6-4-3.
Test Signal Terminal
For example: enable the auto test by testing signal terminal. Detailed operation steps as below:
Procedures
1
Operation Descriptions
Display
Set the external trigger as the load’s trigger mode.
FUNCTI 0 Input
SOURCE 1 Pluse
2
Other test refers to 5.1 section.
After completing all the above steps, connect the test signal to load’s input terminal, input a trigger signal at
test signal terminal, and then activate auto test. When the test is passed, the PASS signal outputs high level;
When the test is failed, the FAIL signal outputs high level; in other states, the PASS signal and FAIL signal
output low level.
- 62 -
Main Specifications
The warm-up time is 30 minutes. Specifications indicate warranted performance in the 25℃±5℃ region of the
total temperature range.
Model
A
B
C
Rated input (0℃~40℃)
Voltage
0~150V
0~150V
0~150V
Current
1mA~30A
1mA~30A
1mA~60A
Power *1
150W
300W
300W
[email protected] current
1.5V
0.82V
1.2V
0.1~30V
0.1~30V
0.1~30V
Constant voltage mode (CV)
Low range
Resolution
1mV
1mV
1mV
±(0.05%+0.02%FS)
±(0.05%+0.02%FS)
±(0.05%+0.02%FS)
High range
0.10~150V
0.10~150V
0.10~150V
Resolution
10mV
10mV
10mV
±(0.05%+0.025%FS)
±(0.05%+0.025%FS)
±(0.05%+0.025%FS)
0~3A
0~3A
0~6A
Accuracy
Accuracy
Constant current mode (CC)
Low range
Resolution
1mA
1mA
1mA
±(0.1%+0.1%FS)
±(0.1%+0.1%FS)
±(0.1%+0.1%FS)
High range
0~30A
0~30A
0~60A
Resolution
10mA
10mA
10mA
±(0.1%+0.15%FS)
±(0.1%+0.15%FS)
±(0.1%+0.15%FS)
Accuracy
Accuracy
Constant resistance mode (CR) (Input voltage /current≥ 10%FS)
Low range (VH CRL)
Resolution
≈0.06~6Ω
≈0.04~6Ω
≈0.025~3Ω
100uΩ
100uΩ
50uΩ
±(0.5%+0.5%FS)
±(0.5%+0.5%FS)
±(0.5%+0.5%FS)
≈6~600Ω
≈6~600Ω
≈3~300Ω
2.7us
2.7us
5.4us
Accuracy (Conductance)
±(1%+1%FS)
±(1%+1%FS)
±(1%+1%FS)
High range (VH CRH)
≈60~4000Ω
≈60~4000Ω
≈30~4000Ω
0.30us
0.30us
0.20us
±(1.5%+1.5%FS)
±(1.5%+1.5%FS)
±(1.5%+1.5%FS)
≈0.06~1.12Ω
≈0.04~1.12Ω
≈0.025~0.6Ω
18uΩ
18uΩ
9.6uΩ
±(0.5%+0.5%FS)
±(0.5%+0.5%FS)
±(0.5%+0.5%FS)
≈1.12~112Ω
≈1.12~112Ω
≈0.6~60Ω
15us
15us
27us
Accuracy (Conductance)
±(1%+1%FS)
±(1%+1%FS)
±(1%+1%FS)
High range (VL CRH)
≈11.2~2000Ω
≈11.2~2000Ω
≈6.0~2000Ω
Accuracy (Impedance)
Middle range (VH CRM)
Resolution
Resolution *2
Accuracy (Conductance)
Low range (VL CRL)
Resolution
Accuracy (Impedance)
Medium range (VL CRM)
Resolution
Resolution
Accuracy (Conductance)
1.6us
1.6us
3.0us
±(1.5%+1.5%FS)
±(1.5%+1.5%FS)
±(1.5%+1.5%FS)
Constant power mode (CP) (Input voltage /current≥ 10%FS)
Range
Resolution
Accuracy
0~150W
0~300W
0~300W
P<100W
1mW
1mW
1mW
P≥100W
10mW
10mW
10mW
±(1%+0.1%FS)
±(1%+0.1%FS)
±(1%+0.1%FS)
- 63 -
Model
A
B
C
Low range
0~30V
0~30V
0~30V
Resolution
1mV
1mV
1mV
±(0.05%+0.02%FS)
±(0.05%+0.02%FS)
±(0.05%+0.02%FS)
High range
0~150V
0~150V
0~150V
Resolution
10mV
10mV
10mV
±(0.05%+0.025%FS)
±(0.05%+0.025%FS)
±(0.05%+0.025%FS)
Low range
0~3A
0~3A
0~6A
Resolution
1mA
1mA
1mA
±(0.1%+0.1%FS)
±(0.1%+0.1%FS)
±(0.1%+0.1%FS)
High range
0~30A
0~30A
0~60A
Resolution
1mA
1mA
1mA
±(0.1%+0.15%FS)
±(0.1%+0.15%FS)
±(0.1%+0.15%FS)
0~150W
0~300W
0~300W
P<100W
1mW
1mW
1mW
P≥100W
10mW
10mW
10mW
1%+0.1%FS
1%+0.1%FS
1%+0.1%FS
Voltage measurement
Accuracy
Accuracy
Current measurement
Accuracy
Accuracy
Power measurement (Input voltage /current≥ 10%FS)
Range
Resolution
Accuracy
Current slew rate
Range
CCH ( /us)
0.1mA ~1.5A
0.1mA ~1.5A
0.1mA ~3A
CCL ( /us) *3
0.1mA ~0.15A
0.1mA ~0.15A
0.1mA ~0.33A
Resolution
0.1mA/us
0.1mA/us
0.1mA/us
Accuracy *4
3%+10us
3%+10us
3%+10us
1s~100h
1s~100h
1s~100h
1s
1s
1s
Accuracy
0.2%+1s
0.2%+1s
0.2%+1s
Battery capacity
3000Ah
3000Ah
6000Ah
1mAh
1mAh
1mAh
0.3%+0.01Ah
0.3%+0.01Ah
0.3%+0.01Ah
0.1V~150V
0.1V~150V
0.1V~150V
10mA
10mA
10mA
CCL
3.6A
3.6A
7.2A
CCH
33A
33A
66A
Battery discharge
Discharge time
Resolution
Resolution
Accuracy
Discharge voltage range
Discharge current resolution
Short circuit
CV
0V
0V
0V
VH CRL
0.044Ω
0.027Ω
0.022Ω
VH CRM
5.6Ω
5.6Ω
2.8Ω
VH CRH
58Ω
58Ω
29Ω
VL CRL
0.044Ω
0.027Ω
0.022Ω
VL CRM
1.1Ω
1.1Ω
0.53Ω
VL CRH
10Ω
10Ω
5.3Ω
CPV
165W
315W
315W
CPC
0W
0W
0W
- 64 -
Model
A
B
C
Current
1.5A /us
1.5A /us
3A /us
Voltage
0.2V /us
0.2V /us
0.2V /us
≥20kΩ
≥20kΩ
≥20kΩ
Current
33A
33A
66A
Voltage
175V
175V
175V
3mA/30mA
3mA/30mA
6mA/60mA
5mV
5mV
5mV
Max. slew rate
Open circuit
Max. input level
Ripple & Noise
Current (rms/p-p)
Voltage (rms)
Transient operation
Transient mode
Continuous, Pulse, Toggled
Frequency range *5
0.01Hz~2kHz
High/Low time
0~99999ms
Resolution
250us
Accuracy
0.2%+10us
Rising/Falling time
250us~99999ms
Resolution
250us
Accuracy
0.2%+10us
List Mode
Step time
10ms~99999s
Resolution
10ms
Accuracy
0.2℅+10us
No. of steps
1~50
No. of cycles
0~65535
Storage
8 Lists
Expanded function
Chain
Trigger input
Trigger level
TTL falling edge
Trigger pulse width
≥20us
General
Protection
Over current, over voltage, over power, over temperature and reverse
voltage protections
Interface
RS-232 interface, support SCPI commands, support Labview
Optional RS-232 to USB cable
Operating environment
0℃~40℃, ≤85%RH
Storage environment
-10℃~70℃, ≤70%RH
Power source
AC110V/220V±10% selectable, 50/60Hz
Accessories
Power cord x1, Operation manual x1, RS-232 cable x1
Dimension (WxHxD)
215x89x412mm
Weight
5.2kg
6.7kg
- 65 -
Model
D
E
F
Voltage
0~500V
0~150V
0~500V
Current
1mA~15A
1mA~60A
1mA~30A
Power *1
300W
600W
600W
[email protected] current
3.8V
0.9V
4.2V
Low range
0.1~30V
0.1~30V
0.1~30V
Resolution
1mV
1mV
1mV
±(0.05%+0.02%FS)
±(0.05%+0.02%FS)
±(0.05%+0.02%FS)
High range
0.10~500V
0.10~150V
0.10~500V
Resolution
10mV
10mV
10mV
±(0.05%+0.025%FS)
±(0.05%+0.025%FS)
±(0.05%+0.025%FS)
Low range
0~1.5A
0~6A
0~3A
Resolution
1mA
1mA
1mA
±(0.1%+0.1%FS)
±(0.1%+0.1%FS)
±(0.1%+0.1%FS)
High range
0~15A
0~60A
0~30A
Resolution
10mA
10mA
10mA
±(0.1%+0.15%FS)
±(0.1%+0.15%FS)
±(0.1%+0.15%FS)
≈0.3~36Ω
≈0.02~3Ω
≈0.15~18Ω
600uΩ
50uΩ
300uΩ
±(0.5%+0.5%FS)
±(0.5%+0.5%FS)
±(0.5%+0.5%FS)
≈36~3600Ω
≈3~300Ω
≈18~1800Ω
0.45us
5.4us
0.90us
Accuracy (Conductance)
±(1%+1%FS)
±(1%+1%FS)
±(1%+1%FS)
High range (VH CRH)
≈360~4000Ω
≈30~4000Ω
≈180~4000Ω
0.051us
0.20us
0.10us
±(1.5%+1.5%FS)
±(1.5%+1.5%FS)
±(1.5%+1.5%FS)
≈0.3~2.4Ω
≈0.02~0.6Ω
≈0.15~1.2Ω
38uΩ
9.6uΩ
19uΩ
±(0.5%+0.5%FS)
±(0.5%+0.5%FS)
±(0.5%+0.5%FS)
≈2.4~240Ω
≈0.6~60Ω
≈1.2~120Ω
6.8us
27us
14us
Accuracy (Conductance)
±(1%+1%FS)
±(1%+1%FS)
±(1%+1%FS)
High range (VL CRH)
≈24~2000Ω
≈6.0~2000Ω
≈12~2000Ω
0.78us
3.0us
1.5us
±(1.5%+1.5%FS)
±(1.5%+1.5%FS)
±(1.5%+1.5%FS)
0~300W
0~600W
0~600W
P<100W
1mW
1mW
1mW
P≥100W
10mW
10mW
10mW
±(1%+0.1%FS)
±(1%+0.1%FS)
±(1%+0.1%FS)
Rated input (0℃~40℃)
Constant voltage mode (CV)
Accuracy
Accuracy
Constant current mode (CC)
Accuracy
Accuracy
Constant resistance mode (CR) (Input voltage /current≥ 10%FS)
Low range (VH CRL)
Resolution
Accuracy (Impedance)
Middle range (VH CRM)
Resolution
Resolution *2
Accuracy (Conductance)
Low range (VL CRL)
Resolution
Accuracy (Impedance)
Medium range (VL CRM)
Resolution
Resolution
Accuracy (Conductance)
Constant power mode (CP) (Input voltage /current≥ 10%FS)
Range
Resolution
Accuracy
- 66 -
Model
D
E
F
Low range
0~30V
0~30V
0~30V
Resolution
1mV
1mV
1mV
±(0.05%+0.02%FS)
±(0.05%+0.02%FS)
±(0.05%+0.02%FS)
High range
0~500V
0~150V
0~500V
Resolution
10mV
10mV
10mV
±(0.05%+0.025%FS)
±(0.05%+0.025%FS)
±(0.05%+0.025%FS)
Low range
0~1.5A
0~6A
0~3A
Resolution
1mA
1mA
1mA
±(0.1%+0.1%FS)
±(0.1%+0.1%FS)
±(0.1%+0.1%FS)
High range
0~15A
0~60A
0~30A
Resolution
1mA
1mA
1mA
±(0.1%+0.15%FS)
±(0.1%+0.15%FS)
±(0.1%+0.15%FS)
0~300W
0~600W
0~600W
P<100W
1mW
1mW
1mW
P≥100W
10mW
100mW
100mW
1%+0.1%FS
1%+0.1%FS
1%+0.1%FS
Voltage measurement
Accuracy
Accuracy
Current measurement
Accuracy
Accuracy
Power measurement (Input voltage /current≥ 10%FS)
Range
Resolution
Accuracy
Current slew rate
Range
CCH ( /us)
0.1mA ~0.75A
0.1mA ~3A
0.1mA ~1.5A
CCL ( /us) *3
0.1mA ~0.075A
0.1mA ~0.33A
0.1mA ~0.15A
Resolution
0.1mA/us
0.1mA/us
0.1mA/us
Accuracy *4
3%+10us
3%+10us
3%+10us
1s~100h
1s~100h
1s~100h
1s
1s
1s
Accuracy
0.2%+1s
0.2%+1s
0.2%+1s
Battery capacity
1500Ah
6000Ah
3000Ah
1mAh
1mAh
1mAh
0.3%+0.01Ah
0.3%+0.01Ah
0.3%+0.01Ah
0.1V~150V
0.1V~150V
0.1V~150V
10mA
10mA
10mA
CCL
1.8A
7.2A
3.6A
CCH
16.5A
66A
33A
Battery discharge
Discharge time
Resolution
Resolution
Accuracy
Discharge voltage range
Discharge current resolution
Short circuit
CV
0V
0V
0V
VH CRL
0.24Ω
0.015Ω
0.13Ω
VH CRM
31Ω
2.8Ω
16Ω
VH CRH
310Ω
29Ω
160Ω
VL CRL
0.24Ω
0.015Ω
0.13Ω
VL CRM
2Ω
0.53Ω
1.0Ω
VL CRH
20Ω
5.3Ω
10Ω
CPV
315W
630W
630W
CPC
0W
0W
0W
- 67 -
Model
D
E
F
Current
0.75A /us
3A /us
1.5A /us
Voltage
0.02V /us
0.2V /us
0.02V /us
≥20kΩ
≥20kΩ
≥20kΩ
Current
16.5A
66A
33A
Voltage
550V
175V
550V
5mA/50mA
6mA/60mA
5mA/50mA
5mV
5mV
5mV
Max. slew rate
Open circuit
Max. input level
Ripple & Noise
Current (rms/p-p)
Voltage (rms)
Transient operation
Transient mode
Continuous, Pulse, Toggled
Frequency range *5
0.01Hz~2kHz
High/Low time
0~99999ms
Resolution
250us
Accuracy
0.2%+10us
Rising/Falling time
250us~99999ms
Resolution
250us
Accuracy
0.2%+10us
List Mode
Step time
10ms~99999s
Resolution
10ms
Accuracy
0.2℅+10us
No. of steps
1~50
No. of cycles
0~65535
Storage
8 Lists
Expanded function
Chain
Trigger input
Trigger level
TTL falling edge
Trigger pulse width
≥20us
General
Protection
Over current, over voltage, over power, over temperature and reverse voltage
protections
Interface
RS-232 interface, support SCPI commands, support Labview
Optional RS-232 to USB cable
Operating environment
0℃~40℃, ≤85%RH
Storage environment
-10℃~70℃, ≤70%RH
Power source
AC110V/220V±10% selectable, 50/60Hz
Accessories
Power cord x1, Operation manual x1, RS-232 cable x1
Dimension (WxHxD)
Weight
215x89x412mm
215x89x507mm
6.7kg
9kg
- 68 -
*1. Maximum continuous power available is derated linearly from 100% of maximum at 40ºC, to 75% of
maximum at 50ºC.
*2. Conductance (S) =1 / Resistance (Ω).
*3. The set level is 10 times larger than the slew rate in CCL mode.
*4. The actual transition time is defined as the time required for the input to change from 10% to 90% or
from 90% to 10% of the
programmed excursion.
*5. Transient frequency depends on the time for high/low level and rising/falling edge.
- 69 -
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