ARRAY CSI3721A 3721A 400 Watt Programmable DC Electronic User Manual

User’s Manual

Programmable

DC Electronic Load

372x series

Chapter1 General Introduction 1

1.1 Function Features ....................................................................................................................... 1

1.2 Front Panel ............................................................................................................................... 2

1.3 Rear Panel .................................................................................................................................. 2

1.4 Keypad Function ........................................................................................................................ 3

1.5 Annunciators .............................................................................................................................. 4

1.6 Menu .......................................................................................................................................... 4

1.6.1 Main Menu ...................................................................................................................... 4

1.6.2 Mode and Parameter Setting Menu ................................................................................. 5

1.6.3 Transient Operation Menu ............................................................................................... 6

1.6.4 Sequence (List) Operation Menu .................................................................................... 6

1.7 Display Messages ....................................................................................................................... 7

1.8 Remote Programming ................................................................................................................ 9

Chapter2 Functions and Features ........................................................................................................... 10

2.1 Local and Remote Control ....................................................................................................... 10

2.2 Programmable Features ............................................................................................................ 10

2.3 Basic Test Function .................................................................................................................. 10

2.3.1 Constant Current Mode (CC) ........................................................................................ 11

2.3.1.1 Setting Ranges .................................................................................................... 11

2.3.1.2 Immediate Current Level .............................................. 11 错误！未定义书签。

2.3.1.3 Triggered Current Level ..................................................................................... 11

2.3.1.4 Transient Current Level ...................................................................................... 12

2.3.1.5 Software Current Limit ...................................................................................... 12

2.3.2 Constant Voltage Mode (CV) ........................................................................................ 12

2.3.2.1 Setting Ranges .................................................................................................... 12

2.3.2.2 Immediate Voltage Level .................................................................................... 12

2.3.2.3 Triggered Voltage Level ..................................................................................... 13

2.3.2.4 Transient Voltage Level ...................................................................................... 13

2.3.3 Constant Resistance Mode (CR) ................................................................................... 13

2.3.3.1 Setting Ranges .................................................................................................... 14

2.3.3.2 Immediate Resistance Level ............................................................................... 14

2.3.3.3 Triggered Resistance Level ................................................................................ 14

2.3.3.4 Transient Resistance Level ................................................................................. 14

2.3.4 Constant Power Mode (CP)........................................................................................... 14

2.3.4.1 Setting Ranges .................................................................................................... 15

2.3.4.2 Immediate Power Level ..................................................................................... 15

2.3.4.3 Triggered Power Level ....................................................................................... 16

2.4 Transient Operation .................................................................................................................. 16

2.4.1 Continuous Transient Operation .................................................................................... 16

2.4.2 Pulsed Transient Operation ........................................................................................... 17

2.4.3 Toggled Transient Operation ......................................................................................... 19

2.5 Sequence (List) Operation ........................................................................................................ 20

2.6 Battery Discharge Operation .................................................................................................... 21

2.7 Short Circuit Operation ............................................................................................................ 22

2.8 Triggered Operation ................................................................................................................. 22

2.9 Input Control ............................................................................................................................ 23

2.9.1 Turn On/Off the Load .................................................................................................... 23

2.9.2 Von Point/Von Latch ..................................................................................................... 23

2.9.3 Current Limit in CV Mode ............................................................................................ 24

2.9.4 Current Rise Rate .......................................................................................................... 25

2.9.5 Current Fall Rate ........................................................................................................... 25

2.10 Measurement Function ........................................................................................................... 26

2.11 Saving and Recalling .............................................................................................................. 26

2.12 Reading Remote Programming Errors ................................................................................... 27

2.13 Status Report .......................................................................................................................... 27

2.14 Protection Function ................................................................................................................ 28

2.14.1 Clearing Latched Protection ........................................................................................ 28

2.14.2 Overvoltage ................................................................................................................. 28

2.14.3 Overcurrent ................................................................................................................. 28

2.14.4 Overpower ................................................................................................................... 29

2.14.5 Overtemperature .......................................................................................................... 29

2.14.6 Reverse Voltage ........................................................................................................... 29

2.15 Auxiliary Functions ................................................................................................................ 29

2.15.1 Trigger Function Selection .......................................................................................... 29

2.15.2 Knob Function ............................................................................................................. 29

2.15.3 Key Sound ................................................................................................................... 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

Chapter 4 Local Operation ..................................................................................................................... 34

4.1 Local Control ........................................................................................................................... 34

4.2 Main Operation on the Front Panel .......................................................................................... 34

4.3 Connecting to the Power Supply .............................................................................................. 34

4.4 Turning the Input On/Off ......................................................................................................... 35

4.5 Basic Tests ................................................................................................................................ 35

4.5.1 CC Mode ....................................................................................................................... 35

4.5.2 CV Mode ....................................................................................................................... 37

4.5.3 CR Mode ....................................................................................................................... 38

4.5.4 CP Mode ........................................................................................................................ 40

4.5.5 Continuous Transient Operation .................................................................................... 43

4.5.6 Pulsed Transient Operation ........................................................................................... 45

4.5.7 Toggled Transient Operation ......................................................................................... 46

4.6 Sequence (List) Operation ........................................................................................................ 48

4.6.1 Sequence (List) Editing ................................................................................................. 49

4.6.2 Modifying, Adding, Inserting, Deleting the Sequence (List) ........................................ 51

4.6.Starting/Stopping the Sequence (List) .............................................................................. 52

4.7 Battery Discharge Operation .................................................................................................... 53

4.8 Saving and Recalling .............................................................................................................. 55

4.9 Clear Protection Settings .......................................................................................................... 56

4.10 Error Messages ....................................................................................................................... 56

4.11 Triggered Operation ............................................................................................................... 56

4.12 Main Menu ............................................................................................................................. 57

4.12.1 Loading Default Values ............................................................................................... 57

4.12.2 Short Circuit Operation ............................................................................................... 57

4.12.3Von Point/Von Latch .................................................................................................... 58

4.12.4 Current Limit in CV Mode .......................................................................................... 59

4.12.5 Current Rise/Fall Rate in CC Mode ............................................................................ 59

4.12.6 Trigger Function Selection .......................................................................................... 60

4.12.7 Knob Function ............................................................................................................. 60

4.12.8 Key Sound ................................................................................................................... 61

4.12.9 Communication Interface ............................................................................................ 61

Chapter5 Remote Programming Operation ............................................................................................ 62

5.1 Communication Interface ......................................................................................................... 63

5.1.1 RS232 ............................................................................................................................ 63

5.1.2 USB ............................................................................................................................... 63

5.1.3 GPIB .............................................................................................................................. 63

5.2 Flow Control Selection ............................................................................................................ 63

5.3 Remote Control Annunciators .................................................................................................. 63

5.4 Sending a Remote Command ................................................................................................... 63

5.5 Returning Data ......................................................................................................................... 63

5.6 Remote Programming Commands ........................................................................................... 64

5.6.1 Modes ............................................................................................................................ 64

5.6.2 Transient Levels ............................................................................................................ 64

5.6.3 Programmable Current Protection ................................................................................. 64

5.7 CV Mode Example ................................................................................................................... 64

5.8 CR Mode Example ................................................................................................................... 64

5.9 Continuous Transient Operation Example ............................................................................... 65

5.10 Pulsed Transient Operation Example ..................................................................................... 65

Specifications ....................................................................................................................................... 656

Chapter1 General Introduction

ARRAY 372x Series programmable electronic load, as a new generation product of ARRAY

Electronic Co., Ltd., is designed with high performance. It provides you powerful test function,

user-friendly HMI, as well as RS232, USB, GPIB interfaces to support SCPI and Labview. 372x 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 ARRAY 372x Series Electronic

Load if there is no special explanation.

1.1 Function Features

Main function and features of ARRAY372x Series:

z 4 basic functions: CC,CV, CR, and CP; 8 basic test modes: CCL, CCH, CV, CRL, CRM,

CRH, CPV, CPC;

z The 24 bit A/D and 17 bit D/A converters incorporated, provide this equipment with greatly

enhanced setting and measurement resolution. 100kHz D/A conversion rate fully improves

high-speed performance;

z Minimum operating voltage is less than 0.6V at the load's full rated current. With optional

low-voltage testing devices, the maximum current can be achieved even though the input

voltage is 0V. This is especially suitable for fuel cell, solar cell and other new energy test

applications;

z Perfect protection assures high reliability in the most complicated of test environments;

z Innovative design of CPV and CPC modes effectively improves the practicability of CP

mode;

z Circuit improvement greatly enhances the dynamic response of CR mode and widens the

application scope of that mode;

z High-speed transient operation with separate high/low level time and rising/falling time

control;

z Powerful sequential test function; with a minimum step time of 10us; and a maximum step

time of 10000s. Cyclic numbers can be adjusted freely and a sequence can be chained to

another sequence to achieve even more complex test procedures;

z The input binding posts with their innovative design are especially suitable for large current

testing;

z Provides short-circuit test, battery discharge test and other auxiliary functions;

z A high-efficiency, intelligent cooling system can effectively reduce system temperature and

enhance power density;

z Automatic ON/OFF function simplifies test operation;

z Knobs and digital keypad makes the operation more convenient;

z Save/recall function can save multiple groups of general settings;

z Supports SCPI (Standard Commands for Programmable Instrumentation) and Labview, and

provides necessary PC software;

1.2 Front Panel

Fig. 1-1 Front Panel

LCD Function key Power switch External trigger input terminal Remote

sense terminal Input binding posts Knob Entry keys/secondary function keys

Annuciators Switch key for secondary function Left&Right key Up &

Down key/Display-switching key

1.3 Rear Panel

Fig1-2 Rear Panel

AC input socket Line voltage switch Fuse holder RS232 Interface GPIB or USB

(optional)

1.4 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 secondary functions of the Entry

Keys are printed in blue. To use the secondary function, please press

key first, then press the

relevant key.

List 1-1 Description for Keys

0/Local key

1/Save key

2/Recall key

3/Error code display key

4/Sequence (list) start key

5/Sequence (list) stop key

6/Battery discharge operation key

7/Insert key

8/Delete key

9/Sequence (list) operation key

Decimal point/Trigger key

Clear or exit /Clear protection

Main Menu

Transient operation menu

Set key

Input on/off

Confirm key

Left key

Right key

Up key

Down key

Switch key for secondary function

Note: Up and Down key can be used as a switch key for displaying load status and actual power

during basic test modes.

1.5 Annunciators

REM

Indicates that the electronic load is in remote status.

ERR

Indicates that a remote programming error(s) has occurred.

1.6 Menu

1.6.1 Main Menu

Press key to enter into main menu. Please see the list below for main menu content:

Function and Parameter Description

Load Default

Yes *No

Restore default

Yes No

Short

On *Off

Short circuit mode

On Off

Von Latch

On *Off

Von latch

On Off

Von Point

0.000v

Set Von voltage point

Von point

CV Curr Limit

40.00A

Current limit in CV mode

Current limit

Curr Rise Rate

4.000A/us

Current rise rate in CC mode

Current rise rate

Curr Fall Rate

4.000A/us

Current fall rate in CC mode

Current fall rate

Trig Function

*Tran List

Trigger function selection

Transient test Sequence (list) test

Knob

*On Off

Enable/disable knob function

On Off

Key Sound

*On Off

Enable/disable key sound

On Off

Interface

*RS232 USB GPIB

Remote interface selection

RS232 USB GPIB

RS232 Interface

Baud Rate

2400 4800 *9600 19200 38400

Baud rate setting

2400 4800 9600 19200 38400

Parity Check

*None Even Odd

Parity check setting

None Even Odd

Data Bit

*8 7

Data bits length

8bits 7bits

Stop Bit

*1 2

Stop bit length

1bit 2bits

Flow Control

*On Off

Enable/disable Flow control

On Off

USB Interface

USB selection

GPIB Interface

GPIB Address

GPIB address

Address value

Note: Except knob, key sound and interface configurations, the other parameters in main menu

will not be saved when the load is turned off. If it is needed to save the parameters, please use

key or *sav command. When the load is turned on next time, the saved parameters in location 0 will be

recalled automatically.

1.6.2 Mode and Parameter Setting Menu

Press key to enter into mode and parameter setting menu, which is shown as below:

Function and Parameter Description

MODE：CCL

CURR： 0.000A

Constant current low range

Immediate current level

MODE：CCH

CURR： 0.000A

Constant current high range

Immediate current level

MODE：CV

VOLT： 80.00V

Constant voltage mode

Immediate voltage level

MODE：CRL

RES： 2.000Ω

Constant resistance low range

Immediate resistance level

MODE：CRM

RES： 20.000Ω

Constant resistance medium range

Immediate resistance level

MODE：CRH

RES： 20.000Ω

Constant resistance high range

Immediate resistance level

MODE：CPV

POWR： 0.000W

Constant power-voltage source mode

Immediate power level

MODE：CPC

POWR： 0.000W

Constant power-current source mode

Immediate power level

1.6.3 Transient Operation Menu

Press key in desired mode to enable its transient operation, and press key to enter

into transient setting menu, which is shown as below:

Function Description Example

LevelL Transient low level 1.000A

LevelH Transient high level 2.000A

TimeL Time for transient low level 600.00ms

TimeH Time for transient high level 600.00ms

TimeR Time for transient rising edge 0.01ms

TimeF Time for transient falling edge 0.01ms

MODE Continuous (Cont) Pulse (Puls) Toggle

(Togg)

Cont

Note: Transient operation may be used in CC, CV, and CR modes.

1.6.4 Sequence (List) Operation Menu

Press key and then press to enter into the list operation menu, which is shown as

below:

Function Description

No. Select sequence (list) number

（0-6）

Memo Sequence memo (10

characters）

Data: <New/Edit> Create a new or edit an existing

sequence

Count Cycle times（1-65535）

Chain: Off Sequence number to be

chained with (0-6，off)

Press and keys in sequence (list) operation menu to select Data: <New/Edit>, and

select New or Edit with the knob or

and keys. Then press key to enter into sequence

data editing status, which is shown as below:

Function Description

01. 10000.00000s

CCH 5.000A

Sequence (List) number

Time

Mode Set value

1.7 Display Messages

① CC Mode:

The first line shows actual voltage and current levels. The second line shows current set level, CC

mode (CCH indicates constant current high range; CCL indicates constant current low range) and

input status of the load: (ON, OFF).

② CV Mode:

The first line shows actual voltage and current levels. The second line shows voltage set

level, CV mode, and input status of the load: (ON, OFF).

③ CR Mode:

The first line shows actual voltage and current levels. The second line shows resistance level, CR

mode (CRL indicates constant resistance low range; CRM indicates constant resistance medium range;

and CRH indicates constant resistance high range) and input status of the load: (ON, OFF).

④ CP Mode:

The first line shows actual voltage and current levels. The second line shows power set level,

CP mode (CPC indicates constant power-current source mode; CPV indicates constant

power-voltage source mode), and input status of the load: (ON, OFF).

⑤ Transient Operation:

The first line shows actual voltage and current levels. The second line shows set level,

transient operation mode (“t” indicates transient operation), and input status of the load: (ON,

OFF).

⑥ Sequence (List) Operation:

The first line shows actual voltage and current levels. The second line shows set level,

sequence operation mode (“l” indicates sequence (list) test); and input status of the load: (ON,

OFF).

⑦ Battery Discharge Operation:

The first line shows actual voltage and current levels. The second line battery capacity and

discharge time.

⑧ Short Circuit Operation:

The first line shows actual voltage and current levels. The second line shows set level in

short circuit, short circuit operation mode ( “s” indicates short circuit test), and input status of the

load (ON, OFF).

⑨ Display Actual Power:

Pressing

and key can switch the display of load status and actual power. On the

display screen of actual power, the first line shows actual voltage and current; the second line

shows set level and actual power level.

⑩ Protection Status

If the protection function is active, 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), over temperature

(OT), load protection (PT), and reverse voltage (RV).

1.8 Remote Programming

The commands are sent to electronic load via remote interface (RS232, GPIB, USB), 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.

Chapter2 Functions and Features

The functions and features of electronic load will be described in this chapter, which helps you to

know ARRAY 372x series better.

2.1 Local and Remote Control

ARRAY 372x 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 command via the GPIB or 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 , keys). 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 pressing

and keys.

Details of local operation are covered in Chapter 4 - Local Operation and fundamentals of remote

programming are given in Chapter 5 - Remote Operation. Complete

SCPI programming details are given in

the ARRAY 372x Series Electronic Load SCPI Programming Guide.

2.2 Programmable Features

Main functions(features) of electronic load:

z CC(

constant current) Mode (CCL, CCH)

z CV(

constant voltage) Mode (CV)

z CR(

constant resistance) Mode (CRL, CRM, CRH)

z CP(

constant power) Mode (CPV, CPC)

z Transient Operation (Tran)

z Sequence (List) Operation

z Battery Discharge Operation (Battery)

z Short 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).

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 for around 5ms 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.

2.3.1 Constant Current Mode

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 key in basic mode to enter into mode selection and parameter

setting menu. Choose CCH or CCL mode with

and keys. Input the current level via the

Entry keys or the knob with

and keys. Use 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), the current setting range is 0~4A; in constant current high

range (CCH), the current setting range is 0~40A. If the range is changed in CC mode while the load’s

input stays ON status, the load will be turned off for around 5ms automatically. For example: when the

load is switched from CCL to CCH, the input will be turned off around 5ms. 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 10.000A, when the load is switched from CCH to CCL, the

current set level will change to the maximum level 4.0000A 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

programmed via 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

only can be set via 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 “ARRAY 372x Series Electronic Load SCPI

Programming Guide”.

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 (0~40A) via 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

(see fig.2-2). Press key in basic mode to enter into mode selection and

parameter setting menu. Choose CV mode with

and keys. Input the voltage value via the

Entry keys or the knob with

and keys. Use 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

The voltage setting range is 0~80V.

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

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.

The triggered voltage level only can be set via 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

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

“ARRAY 372x Series 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 three range: the low range (CRL), the medium range (CRM), and

the high range (CRH). 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 key in basic

mode to enter into mode selection and parameter setting menu. Choose CR mode with

and

keys. Input the resistance value via the Entry keys or the knob with and keys. Use

key for confirmation. The CR mode and parameters can also be set via remote command (MODE

CRL, MODE CRM, MODE CRH, RESistance <NRf+>).

Fig.2-3 CR Mode

2.3.3.1 Setting Ranges

In constant resistance low range (CRL), the resistance setting range is 0.02 ~2Ω; in constant

resistance medium range (CRM), the resistance setting range is 2 ~200Ω; in constant resistance high

range (CRH), the resistance setting range is 20 ~2000Ω. If the range is changed in CR mode while the

load` s input stays ON status, the load will be turned off for around 5ms automatically. For example:

when the load is switched from CRL to CRH, the input will be turned off around 5ms. 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 2.0000Ωfor 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

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.

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 only can be set via 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

“ARRAY 372x Series 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

key to enter into mode selection and parameter setting menu. Choose CPV or

CPC mode with

and keys. Input the power value via Entry keys or the knob with

and

keys. Use 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.

Array 372x 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 adopting advanced slope detection method, Array 372x 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.

2.3.4.1 Setting Ranges

The setting range for the power is 0~400W no matter it is CPV mode or CPV mode.

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 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 only can be set via 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 “ARRAY

372x Series Electronic Load SCPI Programming Guide”。

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.

The range for high/low level time is 0 ~ 655.35ms; the range for rising/falling edge time is 10us ~

655.35ms; the time resolution is 10us, and the maximum test frequency is 50kHz.

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 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 key to enter into transient operation;

Press

key to open transient operation menu;

Set the following parameters in transient operation menu:

LevelL: 5.000A

LevelH : 10.000A

TimeL : 0.50ms

TimeH : 0.50ms

TimeR : 0.20ms

TimeF : 0.20ms

Mode : Cont

Then press

key to turn on the input;

Or via remote command to set:

SCPI Command Description

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 500us Sets transient low level time to 500us

TRAN:HTIM 500us Sets transient high level time to 500us

TRAN:RTIM 200us Sets the time for transient rising edge to 200us

TRAN:FTIM 200us Sets the time for transient falling edge to 200us

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 200us duration of rising edge, and remains at 10A for 500us. Then after 200us

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 front panel, pressing the key, the GPIB GET function, 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

key to enter into transient operation;

Press

key to open transient operation menu;

Set the following parameters in transient operation menu:

LevelL : 5.000A

LevelH : 10.000A

TimeL : 0.50ms

TimeH : 0.50ms

TimeR : 0.10ms

TimeF : 0.10ms

Mode : Puls

Then press

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

TRAN:LLEV 5 Sets transient current low level to 5A

TRAN:HLEV 10 Sets transient current high level to 10A

TRAN:HTIM 500us Sets transient high level time to 500us

TRAN:RTIM 100us Sets the time for transient rising edge to 100us

TRAN:FTIM 200us Sets the time for transient falling edge to 200us

TRAN:MODE PULS Sets 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 100us duration of rising edge, and remains at 10A for 500us. Then

after 200us 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.

The trigger can be an external trigger signal received via the TRIG input on the front panel,

pressing the

key, the GPIB GET function, 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

key to enter into transient operation;

Press

key to open transient operation menu;

Set the following parameters in transient operation menu:

LevelL: 5.000A

LevelH : 10.000A

TimeL : 0.50ms

TimeH : 0.50ms

TimeR : 0.10ms

TimeF : 0.20ms

Mode : Togg

Then press

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

TRAN: LLEV 5 Sets transient current low level to 5A

TRAN:HLEV 10 Sets transient current high level to 10A

TRAN:RTIM 100us Sets the time for transient rising edge to 100us

TRAN:FTIM 200us Sets the time for transient falling edge to 200us

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 100us duration of rising edge. When the

second trigger is

received, the load current will reach and remain at the low level (5A) after 200us

duration of falling edge. Each trigger leads to one toggle operation.

Fig. 2-8 Toggled Transient Operation

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 10us, and the maximum one is

99999.99999s (around 27.78 hours). 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 7 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 5 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.

2.6 Battery Discharge Operation

The electronic load adopts constant current discharge to test battery capacity. The discharge

current and termination voltage can be self-defined. When the battery voltage decreases to the

termination voltage, the battery discharge test will be stopped automatically. 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, and the maximum battery capacity is 4000AH.

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: CCL, the short-circuit current is 4.4A;

CCH, the short-circuit current is 44A; CV, the short-circuit voltage is 0V; CRL, the short-circuit

resistance is 1.8Ω; CRH, the short-circuit resistance is 18Ω; CPV, the short-circuit power is 420W;

CPC, the short-circuit power is 0W.

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.

2.8 Triggered Operation

The triggered operation is mainly used to make the load keep synchronized with other test

equipments or events. Array 372x series electronic load provides various triggering modes, which can

be applied to the following occasions:

z 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.

z Triggering a transient pulse

Gernerates a transient pulse in accordance with the preset transient parameters, when pulsed

transient operation is active.

z 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.

z Triggering a list test

Enables the present list test when the list operation is active.

Three triggering methods are available for remote control: GPIB <GET> signal, the *TRG and

TRIGger commands. The External trigger input terminal and 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.

z The BUS mode: the trigger source is GPIB <GET> signal, or *TRG command.

z The EXTernal mode: Choose the External trigger input terminal or

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)..

z 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

key, or via the remote command (INPUT

ON/OFF).

Turning the input off (zero current) 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.

2.9.2 Von Point/Von Latch

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 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.

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 actual current rise rate in CCL.

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).

2.112.11 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.. 372x Series

electronic load can save 10 groups of parameters. All parameters relevant to saving and recalling

operation are listed in list2-1.

The 10 groups of parameters stored in location 0~9 can be saved and recalled by pressing

and

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 Default

Input Input status Off

Mode Operation mode CCH

Current level Immediate current level 0A

Current rise rate Current rise rate 4A/us

Current fall rate Current fall rate 4A/us

Current Hlevel Transient current high

level

Current Llevel Transient current low level 0A

*Current protection level Current limit 40A

*Current protection delay Current protection delay 60s

*Current protection State Enable/disable current

protection

off

Voltage level Immediate voltage level 80v

CV current limit Current limit in CV mode 40A

Voltage Hlevel Transient high voltage

level

80v

Voltage Llevel Transient voltage low level 80v

Resistance level Immediate resistance level 2000Ω

Resistance Hlevel Transient high resistance

high level

2000Ω

Resistance Llevel Transient resistance low

level

2000Ω

Power level Immediate power level 0W

Transient operation Transient test off

Transient mode Transient mode continuous

Transient Htime Time for transient high

level

0ms

Transient Ltime Time for transient low

level

0ms

Transient Rtime Time for transient rising

edge

0.01ms

Transient Ftime Time for transient falling

edge

0.01ms

Trigger Function Trigger function selection Tran

*Trigger source Trigger source external

Battery Mode Battery discharge

operation

off

Battery mini voltage Battery minimum

termination voltage

Battery discharge current Battery discharge current 0A

Voltage on Von point for the load 0V

Voltage on Latch Latch the Von point Off

* indicates it only can be programmed in the remote control.

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:

z -lxx Command errors

z -2xx Execution errors

z -3xx Device-specific errors

z -4xx Query errors

Remote programming errors can be checked by pressing

key after pressing key on the

front panel. 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, “Too many errors”. 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 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 "ARRAY 372x Series Electronic

Load SCPI Programming Guide".).

2.14 Protection Function

The electronic load is equipped with the following protection functions:

z Overvoltage（OV）

z Overcurrent（OC）

z Overpower（OP）

z Overtemperature（OT）

z Reverse Voltage（RV）

Once any of the above protection function is active, the corresponding status bit in the status will

be set; the input will be turned off with beeps; 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.

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 the secondary function 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 load will display PT to indicate, but the input will not be

turned off. At this time, you can reset the overcurrent time with the secondary function key

the remote command (INPut:PROTection:CLEar).

2.14.2 Overvoltage

The overvoltage protection level is set at a predetermined voltage, which cannot be changed by

the user. When the input voltage exceeds this predetermined voltage, the overvoltage protection will be

enabled, and the input is turned off with OV 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 Overcurrent

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 display will show PT to indicate

protection status, 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 OC 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 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 Overpower

The electronic load includes both hardware and software overpower protection functions.

Once the input power exceeds the maximum rated power, the hardware power-limit circuit will be

enabled immediately to limit the input power within the allowed range, in the meantime, the load will

compute the present actual power.

No matter the hardware power-limit circuit is enabled, or use software to compute, 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 OP 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 Overtemperature

If the internal temperature of the load exceeds safe limits, the overtemperature protection will be

enabled; the input will be turned off with OT 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.

2.14.6 Reverse Voltage

When reverse voltage is applied, the reverse voltage protection will be enabled; the input will be

turned off with RV displayed, 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

2.15.1Trigger Function Selection

The Trigger Function in main 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 main 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 main menu is used to control the key sound. Select On to activate the key

sound and select Off to forbid.

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 ARRAY 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 °C to 40 °C, and

at derated power from 40 °C to 55 °C, 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

Toggle Key on the rear panel is in accordance with the proper voltage in your local place.

Connect the power-line cord and a power-on self-test occurs automatically when you turn

on the load. If the load detects an error during power-on self-test, the error messages will be

displayed as they are shown below:

Error

Codes

Error Messages

601 LCD self-test error

603 System ADC test failed

607 Rundown too noisy

608 Keypad self-test error

609 EEPROM checksum failed

630 Temperature test failed

If there is no error is detected, the LCD will show CCH, the initial display, and the input will

be turned off. If the parameters was modified previously and saved in location 0, the load will

recall these modified parameters automatically. 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 CV 5V operations. If the load works normally, it will draw 5A or set input voltage

to 5V within the allowed tolerance.

3.4 Connections on the Rear Panel

The rear panel is shown as fig. 3-1, which mainly includes AC input part and

communication interface part. The AC input part includes AC input socket, Fuse holder, and

Line voltage switch; the interface part includes RS-232 interface and the interface for optional

GPIB or USB.

AC input:

AC power-line cord must be appropriate for your local standard.

The specifications of the fuse: 250V 315mA.

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.

Communication Interfaces:

RS-232 Interface:

The load provides a RS-232 interface, which is a standard DB9 pin connector using DTR

and DSR to execute flow control. The pin assignment is shown below:

Pin Input/Output Description

1 - Not used

2 Input RXD Receive data

3 Output TXD Transmit data

4 Output DTR Data terminal ready

5 Common GND Ground

6 Input DSR Data set ready

7 - Not used

8 - Not used

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.

GPIB Interface:

The load provides a GPIB interface, and you can set its address to any value between 0

and 30 in MENU. When multiple GPIB devices are connected, each device on the GPIB

interface must have a unique address that is not be used by the devices on other interfaces.

The address is set to “05” when the load is shipped from the factory. The default setting can

be changed when you are setting the interface.

USB Interface:

The load provides a USB interface. You need to install the software provided by the

factory in PC to realize communication with the load.

USB and GPIB interfaces occupy the same expansion slot on the rear panel, so only one

type interface can be chosen to install at the same time, meanwhile, only one type interface

can be used by the load to communicate with external devices.

3.5 Connections on the Front Panel

The terminals on the front panel include input terminals (INPUT+, INPUT-), remote sense

terminals (SENSE +, SENSE -), and an external trigger input terminal. See Fig. 3-2.

Input Connections

Input connections are made to two binding posts (INPUT+, INPUT-) on the front panel.

The maximum wire diameter is 6mm. 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.

Remote Sense

Remote sensing is made to two terminals (SENSE+, and 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.

TRIGGER Connections

The external trigger input terminal on the front 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.

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.

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.

Chapter 4 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

, keys). When the load receives a remote command (SYST:REM) via RS232 or GPIB,

the remote control goes into effect and REM 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 pressing

and keys.

4.2 Main Operation on the Front Panel

z Connecting to the Power Supply

z Turning the Input On/Off

z CC Mode

z CV Mode

z CR Mode

z CP Mode

z Short Circuit Operation

z Continuous Transient Operation

z Pulsed Transient Operation

z Toggled Transient Operation

z Sequence (List) Operation

z Battery Discharge Operation

z Saving and Recalling Parameters

z Clear Protection Settings

z Error Messages

z Triggered Operation

z 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, press

+ keys to clear the RV

protection status (the relevant details will be described in “Clearing Protection Settings”).

4.4 Turning the Input On/Off

Press key to turn on or turn off the input.

4.5 Basic Tests

The operating procedures for basic tests are shown below:

1. Press

key to enter into the mode selection and parameter setting menu.

2. Use

, keys to select one basic mode.

3. Use Entry keys or use the knob together with

, keys to input set value. Use key

to modify the set value or exit the mode selection and parameter setting menu.

4. Press

key to confirm and exit the mode selection and parameter setting menu.

5. Press 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 below:

Procedures Operation Descriptions Display

Press

key to enter into the mode selection and

parameter setting menu;

MODE：CV

CURR： 80.000

Use

key to select CCH;

MODE：CCH

CURR： 0.000

3 Use Entry keys or use the knob together

with , keys to input the current value to

5.12;

MODE：CCH

CURR： 5.120A

Press key to confirm and exit the mode

selection and parameter setting menu;

0.000V 0.000A

5.120

A CCH OFF

Press

key to turn on the load;

0.000V 0.000A

5.120

A CCH ON

Use

, keys to check the present power

value;

0.000V 0.000A

5.120

A 0.000W

For the above operating procedures, the corresponding SCPI commands should be:

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

Press

key to enter into the mode selection and

parameter setting menu;

MODE：CCH

CURR： 5.120

2 Use Entry keys or use the knob together

with , keys to input the current value to 5.8;

MODE：CCH

CURR： 5.800A

Press key to confirm and exit the mode

selection and parameter setting menu;

0.000V 0.000A

5.800

A CCH OFF

Press

key to turn on the load;

0.000V 0.000A

5.800

A CCH ON

Solution2:

Procedures Operation Descriptions Display

Move the cursor to the hundredths with

key;

0.000V 0.000A

5.12

0A CCH OFF

2 Rotate the knob to set the hundredths to 0;

(The set value will be changed when rotating the

knob. The set value will become effective at input at

once when the load is turned on.)

0.000V 0.000A

5.10

0A CCH OFF

Move the cursor to the tenths with

key;

0.000V 0.000A

5.1

00A CCH OFF

4 Rotate the knob to set the tenths to 8;

(The set value will be changed when rotating the

knob. The set value will become effective at input at

once when the load is turned on.)

0.000V 0.000A

5.8

00A CCH OFF

Press

key to turn on the load;

0.000V 0.000A

5.8

00A CCH ON

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 CV mode and the voltage value to 50V in CCH mode.

Turn on the load, and check the present power value. The operating procedures are

shown below:

Procedures Operation Descriptions Display

Press

key to enter into the mode selection and

parameter setting menu;

MODE：CCH

CURR： 3.800

Use

key to select CV mode;

MODE：CV

VOLT： 80.000

3 Use Entry keys or use the knob together

with , keys to input the voltage value to 50;

MODE：CV

VOLT： 50.000V

Press key to confirm and exit the mode

selection and parameter setting menu;

0.000V 0.000A

50.000

V CV OFF

Press

key to turn on the load;

0.000V 0.000A

50.000

V CV ON

Check the present power value with

keys;

0.000V 0.000A

50.000

V 0.000W

For the above operating procedures, the corresponding SCPI commands should be:

MODE CV ；Sets the mode

VOLT 50 ；Sets the voltage value

INPUT ON ；Turns on the load

Example2: Set the voltage value to 60V in CV mode.

Turn on the load, and there are two ways to set the voltage value.

Solution 1:

Procedures Operation Descriptions Display

Press

key to enter into the mode selection and

parameter setting menu;

MODE：CV

CURR： 50.000

2 Use Entry keys or use the knob together

with

, keys to input the voltage value to 60;

MODE：CV

VOLT： 60.000V

Press key to confirm and exit the mode

selection and parameter setting menu;

0.000V 0.000A

60.000

V CV OFF

Press

key to turn on the load;

0.000V 0.000A

60.000

V CV ON

Solution 2:

Procedures Operation Descriptions Display

Move the cursor to the tens with

key;

0.000V 0.000A

0.000V CV ON

2 Rotate the knob to set the tens to 6;

(The set value will be changed when rotating the

knob. The set value will become effective at input at

once when the load is turned on.)

0.000V 0.000A

0.000V CV OFF

Press

key to turn on the load;

0.000V 0.000A

0.000V CV ON

For the above operating procedures, the corresponding SCPI commands should be:

MODE CV ；Sets the mode

VOLT 60 ；Sets the voltage value

INPUT ON ；Turns on the load

Note: CV 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 constant resistance low range (CRL), constant resistance medium range

(CRM), and constant resistance high range (CRH).

Example1: Set the load to CRL and set the resistance value to1.5Ωin CV mode.

Turn on the load, and check the present power value. The operating procedures are

shown below:

Procedures Operation Descriptions Display

Press

key to enter into the mode selection and

parameter setting menu;

MODE：CV

CURR： 50.000

Use

key to select CRL;

MODE： CRL

RES ： 0.0200

3 Use Entry keys or use the knob together

with , keys to input the resistance value to

1.5;

MODE： CRL

RES ： 1.5000Ω

Press key to confirm and exit the mode

selection and parameter setting menu;

0.000V 0.000A

1.5000

Ω CRL OFF

Press

key to turn on the load;

0.000V 0.000A

1.5000

Ω CRL ON

Check the present power value with

, ;

0.000V 0.000A

1.5000

Ω 0.000W

For the above operating procedures, the corresponding SCPI commands should be:

MODE CRL ；Sets the mode

RES 1.5 ；Sets the resistance value

INPUT ON ；Turns on the load

Example2: Set the resistance value to 1.8Ωin CRL.

Turn on the load, and there are two ways to set the resistance value.

Solution 1:

Procedures Operation Descriptions Display

Press

key to enter into the mode selection and

parameter setting menu;

MODE： CRL

RES ： 1.5000

2 Use Entry keys or use the knob together

with , keys to input the resistance value to

1.8;

MODE： CRL

RES ： 1.8000Ω

Press key to confirm and exit the mode

selection and parameter setting menu;

0.000V 0.000A

1.8000

Ω CRL OFF

Press

key to turn on the load;

0.000V 0.000A

1.8000

Ω CRL ON

Solution 2:

Procedures Operation Descriptions Display

Move the cursor to the tenths with

key;

0.000V 0.000A

1.5

000Ω CRL OFF

2 Rotate the knob to set the tenths to 8;

(The set value will be changed when rotating the

knob. The set value will become effective at input at

once when the load is turned on.)

0.000V 0.000A

1.8

000Ω CRL OFF

Press

key to turn on the load;

0.000V 0.000A

1.8

000Ω CRL ON

For the above operating procedures, the corresponding SCPI commands should be:

MODE CRL ；Sets the mode

RES 1.8 ；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 CCL status.

4.5.4 CP Mode

CP Mode includes constant power-current source mode (CPV) and constant power-voltage source

mode (CPC).

Example1: Set the load to CPV and set the power value to100W in CRL.

Turn on the load, and check the present power value. The operating procedures are

shown below:

Procedures Operation Descriptions Display

Press

key to enter into the mode selection and

parameter setting menu;

MODE： CRL

RES ： 1.8000

Use

key to select CPV;

MODE： CPV

POWR： 0.000

3 Use Entry keys or use the knob together

with , keys to input the power value to 100;

MODE： CPV

POWR： 100.00W

Press key to confirm and exit the mode

selection and parameter setting menu;

0.000V 0.000A

100.00

W CPV OFF

Press

key to turn on the load;

0.000V 0.000A

100.00

W CPV ON

Check the present power value with

, ;

0.000V 0.000A

100.00

W 0.000W

For the above operating procedures, the corresponding SCPI commands should be:

MODE CPV ；Sets the mode

POW 100 ；Sets the power value

INPUT ON ；Turns on the load

Example2: Set the power value to 200W in CPV mode.

Turn on the load, and there are two ways to set the power value.

Solution 1:

Procedures Operation Descriptions Display

Press

key to enter into the mode selection and

parameter setting menu;

MODE： CPV

POWR： 100.00

2 Use Entry keys or use the knob together

with , keys to input the power value to 200;

MODE： CPV

POWR： 200.00W

Press key to confirm and exit the mode

selection and parameter setting menu;

0.000V 0.000A

200.00

W CPV OFF

Press

key to turn on the load;

0.000V 0.000A

200.00

W CPV ON

Solution 2:

Procedures Operation Descriptions Display

Move the cursor to the hundredths with

key;

0.000V 0.000A

00.00W CPV OFF

2 Rotate the knob to set the hundredths to 2;

(The set value will be changed when rotating the

knob. The set value will become effective at input at

once when the load is turned on.)

0.000V 0.000A

00.00W CPV OFF

Press

key to turn on the load;

0.000V 0.000A

00.00W CPV ON

For the above operating procedures, the corresponding SCPI commands should be:

MODE CPV ；Sets the 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 CPC mode.

4.6 Short Circuit Operation

The operating procedures for short circuit operation are shown below:

1. Press

key to enter into main menu, and select Short (short circuit) item with key.

2. Use

key or knob to set On, and press key to confirm.

3. Press key to exit the main menu. The display shows “s” to indicate in the basic test

mode.

4. Press

key to enter into the mode selection and parameter setting menu; use ,

keys to select one basic test mode; press

key to confirm and exit the mode selection

and parameter setting menu.

5. Press

key to turn on the load.

Example1: The load was in CV 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

Press

key to enter into main menu, and select Short (short

circuit) item with

key.

Short：

On *Off

Use key or knob to set On, and press key to

confirm.

Short：

*On Off

Press

key to exit the main menu. The display shows “s”

to indicate in CV mode.

0.000V 0.000A

0.000V sCV OFF

Press

key to enter into the mode selection and parameter

setting menu; use

key to select CCH; press key to

confirm and exit the mode selection and parameter setting

menu.

0.000V 0.000A

44.000A sCCH OFF

Press

key to turn on the load;

0.000V 0.000A

44.000A sCCH ON

For the above operating procedures, the corresponding SCPI commands should be:

INPUT:SHORT ON ; Sets the load to short circuit operation

MODE CCH ; Sets the mode

INPUT ON ; Turns on the load

Example2: Based on the last example, exit the short circuit operation, and turn off the load.

Procedures Operation Descriptions Display

Press

key to enter into main menu, and select Short (short

circuit) item with

key.

Short：

*On Off

Use

key or knob to set Off, and press key to

confirm.

Short：

On *Off

Press

key to exit the main menu. On the display, “s”

disappears in CCH status.

0.000V 0.000A

0.000

A CCH ON

Press

key to turn off the load;

0.000V 0.000A

0.000

A CCH OFF

For the above operating procedures, the corresponding SCPI commands should be:

INPUT:SHORT OFF ；Sets the load to exit the short circuit operation

INPUT OFF ；Turns on the load

4.7 Transient Operation

The operating procedures for transient operation are shown below:

1. Press

key to enter into the mode selection and parameter setting menu; use ,

keys to select one basic test mode; press key to confirm and exit the mode selection

and parameter setting menu.

2. Press key to enter into transient operation. The display shows “t” to indicate in the

basic test mode.

3. Press key to enter into the transient operation menu.

4. Use , keys to select the parameter.

5. Use Entry keys or use the knob together with , keys to set values for LevelL,

LevelH, TimeL, TimeH, TimeR, and TimeF. Use

, keys or knob to set Mode value.

6. Press key to exit the transient operation menu.

7. Press key to turn on the load.

8. If it is the pulsed transient operation or the toggled transient operation, one trigger occurs

when pressing

+ key or the signal at the trigger input terminal (TRIG IN) is low

level.

4.5.5 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),

Example1: 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 Operation Descriptions Display

Press

key to enter into the mode selection and parameter

setting menu; use

, keys to select CV mode; press

key to confirm and exit the mode selection and parameter

setting menu.

0.000V 0.000A

0.000

V CV OFF

Press

key to enter into transient operation. The display

shows “t” to indicate in CV mode.

0.000V 0.000A

80.000V

tCV OFF

Press

key to enter into the transient operation menu.

► LevelL:80.000V

LevelH:80.000V

Use Entry keys or use the knob together with

, keys to

set LevelL to 1, and press

key to confirm.

LevelL:1.000V

►LevelH:80.000V

Use Entry keys or use the knob together with

, keys to

set LevelH to 5, and press

key to confirm.

►TimeL :530.00ms

TimeH :500.00ms

Use Entry keys or use the knob together with

, keys to

set TimeL to 400ms, and press

key to confirm.

TimeL :400.00ms

►TimeH :500.00ms

Use Entry keys or use the knob together with

, keys to

set TimeH to 200ms, and press

key to confirm. The

menu will show the next item automatically.

►TimeR: 100.00ms

TimeF: 100.00ms

Use Entry keys or use the knob together with

, keys to

set TimeR to 10ms, and press

key to confirm.

TimeR: 10.00ms

►TimeF: 100.00ms

Use Entry keys or use the knob together with

, keys to

set TimeF to 20ms, and press

key to confirm.

►Mode: ◄ Cont ►

Use

, keys or knob to set Mode value to Cont, and

press

key to confirm.

►Mode: ◄ Cont ►

Press

key to exit the transient operation menu.

0.000V 0.000A

1.000V

tCV OFF

Press

key to turn on the load;

0.000V 0.000A

1.000V

tCV ON

0.000V 0.000A

5.000V

tCV ON

For the above operating procedures, the corresponding SCPI commands should be:

MODE CV ；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 400 ms ；Sets a value to low level time

TRAN:HTIME 200ms ；Sets a value to high level time

TRAN:RTIME 10ms ；Sets a value to time for rising edge

TRAN:FTIMR 20ms ；Sets a value to time for falling edge

TRAN:MODE CONT ；Selects continuous transient operation

INPUT ON ；Turns on the load

4.5.6 Pulsed Transient Operation

Example1: 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 Operation Descriptions Display

Press

key to enter into the mode selection and parameter

setting menu; use

, keys to select CCH mode; press

key to confirm and exit the mode selection and parameter

setting menu.

0.000V 0.000A

0.000

A CCH OFF

Press

key to enter into transient operation. The display

shows “t” to indicate in CCH status.

0.000V 0.000A

0.500A

tCCH OFF

Press

key to enter into the transient operation menu.

►LevelL: 0.500A

LevelH:1.000A

Use Entry keys or use the knob together with

, keys to

set LevelL to 1, and press

key to confirm.

LevelL: 1.000

►LevelH: 1.000A

Use Entry keys or use the knob together with

, keys to

set LevelH to 5, and press

key to confirm.

►TimeL:400.00ms

TimeH:400.00ms

Press

key to select TimeH; use Entry keys or use the knob

together with

, keys to set TimeH to 20ms, and press

key to confirm.

► TimeR:10.00ms

TimeF:20.00ms

Use Entry keys or use the knob together with

, keys to

set TimeR to 10ms, and press

key to confirm.

TimeR:10.00ms

►TimeF:20.00ms

Use Entry keys or use the knob together with

, keys to

►Mode: ◄Cont ►

set TimeF to 10ms, and press key to confirm.

Use

, keys or knob to set Mode value to pulse, and

press

key to confirm.

►Mode: ◄ Puls ►

Press

key to exit the transient operation menu.

0.000V 0.000A

1.000A

tCCH OFF

Press

key to turn on the load;

0.000V 0.000A

1.000A

tCCH ON

One trigger occurs when pressing

+ key or the signal

at the trigger input terminal (TRIG IN) is low level.

0.000V 0.000A

5.000A

tCCH ON

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 200ms ；Sets a value to high level time

TRAN:RTIME 10us ；Sets a value to time for rising edge

TRAN:FTIME 10us ；Sets a value to time for falling edge

TRAN:MODE PULS ；Selects pulsed transient operation

INPUT ON ；Turns on the load

Trig ; One trigger occurs

4.5.7 Toggled Transient Operation

Example1: Assume that the load is in external triggering mode, set the load resistance value to

periodically switch between 200Ωand 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 Operation Descriptions Display

Press

key to enter into the mode selection and parameter

setting menu; use

, keys to select CRH mode; press

key to confirm and exit the mode selection and parameter

setting menu.

0.000V 0.000A

20.000Ω CRH OFF

Press

key to enter into transient operation. The display

shows “t” to indicate in CRH status.

0.000V 0.000A

2000.0

Ω tCRH OFF

Press

key to enter into the transient operation menu.

►LevelL：2000.0Ω

LevelH：2000.0Ω

Use Entry keys or use the knob together with

, keys to

set LevelL to 200, and press

key to confirm.

LevelL：200.00Ω

►LevelH：2000.0Ω

Use Entry keys or use the knob together with

, keys to

set LevelH to 500, and press

key to confirm.

►TimeL:400.00ms

TimeH:200.00ms

Press

key to select TimeR; use Entry keys or use the knob

together with

, keys to set TimeR to 10ms, and press

key to confirm.

TimeR:10.00ms

►TimeF:10.00ms

Use Entry keys or use the knob together with

, keys to

set TimeF to 10ms, and press

key to confirm.

►Mode: ◄ Puls ►

Use

, keys or knob to set Mode value to Togg, and

press

key to confirm.

►Mode: ◄Togg ►

Press

key to exit the transient operation menu.

0.000V 0.0000A

200.00Ω

tCRH OFF

Press

key to turn on the load;

0.000V 0.0000A

200.00Ω

tCRH ON

One trigger occurs when pressing

+ key or the signal

at the trigger input terminal (TRIG IN) is low level.

0.000V 0.0000A

500.00Ω

tCRH ON

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 10us ；Sets a value to time for rising edge

TRAN:FTIME 10us ；Sets a value to time for falling edge

TRAN:MODE TOGG ；Selects toggled operation

INPUT ON ；Turns on the load

Trig ; One trigger occurs

4.6 Sequence (List) Operation

After sequence editing, the operating procedures for enabling and disabling sequence operation

are shown as below:

1. Press

+ keys to enter into sequence operation menu.

2. Use Entry keys or the knob to select list number (No.), and press

key to confirm.

3. Press key to exit sequence operation menu.

4. Press

+ keys to activate sequence operation.

5. Press

+ keys to stop sequence operation.

The operating procedures for sequence operation are shown below:

1. Press + keys to enter into sequence operation menu.

2. Use Entry keys or the knob to select list number (No.), and press key to confirm.

3. Use key to select list memo (Memo).

4. Use knob and , keys to edit memo (max. 10 characters).

5. Use key to select sequence data (Data:<New/Edit>)..

6. Use , keys or knob to select New or Edit operation, and press key to

confirm.

7. Use , keys to select parameters.

8. Use Entry keys or use the knob together with , keys to input set value; or use the

knob/

key to select one test mode, and press key to confirm. After setting the third

parameter, press

key to confirm and enter into the next step.

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 8.

10. 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 8.

11. 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 + keys to insert a new

step. The setting operations for this new step are the same as the operating procedure 8.

12. If it is needed to delete an edited step, use

, keys to select this step, and press

+ keys to delete. If there is only one step exists, it will exit the step edit screen.

13. Press key to exit step edit screen, and save the sequence data in EEPROM assigned by

the sequence number.

14. Use key to select the cycle times (Count); use Entry keys or the knob together

with

, keys to input set value. Press key to confirm and save the cycle times

(Count) in EEPROM assigned by the sequence number.

15. Use key to select “Chain”; use Entry keys (the “Chain” is OFF when the Entry key

exceeds 6) or the knob to input the set value. Press

key to confirm.

16. Press key to exit sequence operation menu.

17. Press + keys to activate sequence operation.

18. Press + keys to stop sequence operation.

4.6.1 Sequence (List) Editing

Example1: 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: CV, 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

Press

+ keys to enter into sequence operation menu.

►No.: 0

Memo:

2 Use Entry keys or the knob to set the sequence number (No.) to

0, and press

key to confirm (recall the sequence in

EEPROM assigned by the sequence number).

►No.: 0

Memo:

Use

key to select sequence memo (Memo).

No.: 0

►Memo:_

4 Rotate the knob to select the letter “T”. No.: 0

►Memo:T

Use

key to move the cursor to the right.

No.: 0

►Memo:T_

6 Rotate the knob to select the letter “e”. No.: 0

►Memo:Te

7 Set Memo to “Test Power” according to step5 and setp6

operations. Press

key to confirm.

No.: 0

►Memo: Test Power

Use

key to select Data:<New/Edit>。

►Data:<New/Edit>

Count: 1

Use key or knob to select New, and press key to

confirm.

Clear Data:

Yes *No

Use key or knob to select Yes, and press key to

confirm. The data is cleared and step edit screen appears.

01. 0.00000s

CCH 0.000A

11 Edit the step1: CCL, 1A, 1S. The time set value in the upper

right corner of the display flashes. Use Entry keys or the knob

together with

, keys to input time to1s, and press

key to confirm.

01. 1.00000s

CCH 0.000A

12 The basic mode in lower left corner of the display flashes. Use

the knob or

key to select operating mode to CCL, and

press

key to confirm.

01. 1.00000s

CCL 0.000A

13 The set value in the lower right corner of the display flashes.

Use Entry keys or the knob together with , keys to

input the current value to 1A. Press

key to confirm and

enter into the next operation.

01. 1.00000s

CCL 1.0000

14 Repeat the procedures 11 through 13 to set the rest four steps.

15 The five sequence steps have been edited, and there is no need

to edit the step6. Press

key to exit step edit screen and

save the sequence data in EEPROM assigned by the sequence

number.

06. 0.00000

CRH 20.000Ω

Use

key to select “Count”; use Entry keys or the knob

together with

, keys to input “5”. Press key to

confirm and save the Count value in EEPROM assigned by the

sequence number.

Data:<New/E

dit>

►

Count: 5

Use

key to select “Chain”; use Entry keys (the “Chain”

►Chain:Off

is OFF when the Entry key exceeds 6) or the knob to input

“Off”. Press

key to confirm and save the Chain value in

the EEPROM assigned by the sequence number.

Press

key to exit sequence operation menu.

0.000V 0.000A

0.000A CCH OFF

Press

+ keys to activate sequence operation.

0.000V 0.0000A

1.000A

LCCL ON

Press

+ keys to stop sequence operation.

0.000V 0.000A

0.000A CCH OFF

For the above operating procedures, the corresponding SCPI commands should be:

LIST:RECALL 0 ；Recalls the sequence of the number 0

LIST:MEMO Test Power ；Sequence memo is “Test Power”

LIST:DATA CCL,1A,1S

LIST:DATA CCH,2A,1S

LIST:DATA CV,1V,1S

LIST:DATA CRL,1Ω,1S

LIST:DATA CRH,200Ω,1S ；The above 5 commands are sequence steps

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

4.6.2 Modifying, Adding, Inserting, Deleting the Sequence (List)

Exampel1: Based on the example1 in 4.6.1 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.

Steps Operation Descriptions Display

Step1

Press

+ keys to enter into sequence operation menu.

►No.: 0

Memo: T

est Power

Step2

Use

key to select Data:<New/Edit>。

►Data:<New/Edit>

Count: 5

Step3

Use key or knob to select Edit, and press key to

confirm.

01. 1.00000s

CCL 1.0000A

Step4

Use

key to select time parameter, and the time set value

flashes.

01. 1.00000

CCL 1.0000A

Step5

Use Entry keys or the knob together with

, keys to input

the time to 2s, and press

key to confirm.

01. 2.00000s

CCL 1.0000A

Step6

Use

key to select the last new step (Step6).

06. 0.00000

CRH 20.000Ω

Step7 Add a new step: CCH, 5A, 1S. The set value in the upper right

corner of the display flashes. Use Entry keys or the knob together

with

, keys to input time to 1s, and press key to

confirm.

06. 1.00000

CRH 20.000Ω

Step8 The basic mode in lower left corner of the display flashes. Use the

knob or

key to select operating mode to CCH, and press

key to confirm.

06. 1.00000s

CCH 0.000A

Step9 The set value in the lower right corner of the display flashes. Use

Entry keys or the knob together with , keys to input the

current value to 5A. Press

key to confirm and enter into the

next operation.

06. 1.00000s

CCH 5.000

07. 0.00000s

CCH 0.000A

Step10

Use

key to select the step3.

03. 1.00000s

CV 1.000V

Step11

Press

+ keys to insert a new step at step3.

03. 0.00000

CV 0.000V

Step12 Insert a new step: CRL, 1Ω,10S at step3. The setting operations for

this new step are the same as the operating procedures7 to 9.

03. 10.00000s

CRL 1.0000Ω

Step13

Use

key to select the step2.

02. 1.00000s

CCH 2.000A

Step14

Press

+ keys to delete the step2.

02. 10.0000s

CRL 1.0000Ω

Step15

Press

key to exit step edit screen and save the sequence data

in EEPROM assigned by the sequence number.

►Data:<New/Edit>

Count: 5

Step16

Use

key to select Chain。

►Chain: Off

Step17 Use Entry keys or the knob to input 0 (it is chained o itself to

realize continuous execution). Press

key to confirm and save

the Chain value in EEPROM assigned by the sequence number.

►Chain: 0

Step18

Press

key to exit sequence operation menu.

0.000V 0.000A

0.000A CCH OFF

4.6.3 Starting/Stopping the Sequence (List)

Example1: Start the No.0 sequence, and stop the active sequence operation.

Steps Operation Descriptions Display

Step1

Press

+ keys to enter into sequence operation menu.

►No.: 1

emo:

Step2 Use Entry keys or knob to set the sequence number (No.) to 0, an

press key to confirm (recall the sequence in EEPROM

assigned by the sequence number).

►No.: 0

Memo: Test Power

Step3

Press

key to exit sequence operation menu.

0.000V 0.000A

0.000

A CCH OFF

Step4

Press

+ keys to activate sequence operation.

0.000V 0.0000A

1.0000A

LCCL ON

Step5

Press

+ keys to stop sequence operation.

0.000V 0.000A

0.000

A CCH OFF

For the above steps, the corresponding SCPI commands should be:

LIST:RECALL 0 ；Recalls the number 0 sequence

LIST ON ；Starts sequence operation

LIST OFF ；Stops sequence operation

4.7 Battery Discharge Operation

Battery discharge operation diagram:

The operating procedures for battery discharge operation are shown below:

1. Press

key to turn off the load, and connect the tested battery correctly.

2. Press

+ keys to enter into battery discharge operation screen.

3. Press key to enter into battery discharge parameters edit screen. Use , keys to

select the parameter. Use Entry keys or the knob together with

, keys to input

termination voltage value and discharge current value. Press

key to confirm.

4. Press key to exit the battery discharge parameters edit screen.

5. Press

key to turn on the load, and start battery discharge operation.

6. Press

key to turn off the load, and stop battery discharge operation.

7. Press key to clear the discharged time and discharged capacity of the battery.

8. Press

+ keys to exit the battery discharge operation.

Example1: 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.

Steps Operation Descriptions Display

Step1

Press

key to turn off the load, and connect the tested battery

correctly.

20.000V 0.000A

0.000

A CCH OFF

Step2

Press

+ keys to enter into battery discharge operation

screen.

20.000V 0.000A

0.000AH 00:00:00

Step3

Press

key to enter into battery discharge parameters edit screen.

Use Entry keys or the knob together with

, keys to inpu

termination voltage to 15V. Press key to confirm.

►MinVolt:0.000V

DisCurr:2.000A

Step4

Use Entry keys or the knob together with

, keys to inpu

discharge current to 3A. Press key to confirm.

MinVolt:15.000V

►DisCurr:3.000A

Step5

Press

key to exit the battery discharge parameters edit screen.

20.000V 0.000A

0.000AH 00:00:00

Step6

Press

key to turn on the load, and start battery discharge

operation.

20.000V 3.000A

0.000AH 00:00:01

Step7

Press

key to turn off the load, and stop battery discharge

operation.

20.000V 0.000A

0.012AH 00:00:15

Step8

Press

key to clear the discharged time and discharged capacity

of the battery.

20.000V 0.000A

0.000AH 00:00:00

Step9

Press

+ keys to exit the battery discharge operation.

20.000V 0.000A

0.000

A CCH OFF

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 15V ；Sets termination voltage to 15V

BATT:DIS:CURR 3A ；Sets discharge current to 3A

INPUT ON ；Turns on the load, and start battery discharge operation

INPUT OFF ； Turns off the load, and stop battery discharge

operationBATTERY OFF ；Exits the battery discharge operation

4.8 Saving and Recalling

The operating procedures for saving and recalling operation are shown below:

Press + keys to enter into the saving menu, or press + keys to enter into

the recalling menu.

2. Press Entry keys or the knob to select saving or recalling position. 选择保存或调用位置。

3. Press 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 Operation Descriptions Display

1 Set the mode to CCL,; set the current value to 2A; turn on the load

(

detailed operations).

0.000V 0.000A

2.0000A CCL ON

Press

+ key to enter into the saving menu.

Save File

No. 1

3 Press Entry keys or the knob to select the location 0 for saving.

Save File

No. 0

Press key to confirm and exit the load saving menu.

0.000V 0.000A

2.0000A CCL ON

For the above operating procedures, the corresponding SCPI commands should be:

MODE CCH ；Sets the load to CCH status

CURR 2 ；Sets the current value to 2A

*SAV 0 ；Saves the present settings in location0 in EEPROM

Example2: Based on the above example, set the mode to CV; set the voltage value to 40V; turn

off the load; recall the values saved in location0 in EEPROM. The detailed operations are shown

below:

Procedures Operation Descriptions Display

1 Set the mode to CV; set the voltage value to 40V; turn off the loa

(please refer to 4.4 section for detailed operations).

0.000V 0.000A

40.000V CV OFF

Press

+ keys to enter into the recalling menu.

Recall File:

No. 0

3 Press Entry keys or the knob to select the recalled location 0. Recall File:

No. 0

Press key to confirm and return.

0.000V 0.000A

2.0000A CCL ON

For the above operating procedures, the corresponding SCPI commands should be:

MODE CV ；Sets the CV mode

VOLT 40 ；Sets the voltage value to 40V

*RCL 0 ；Recalls the values saved in location 0 in EEPROM

4.9 Clear Protection Settings

The operating procedures for clear protection settings are shown below:

1. Eliminate the reason that causes the protection status.

2. Press

+ keys.

Example1: Clear RV protection of the load. The detailed operations are shown below:

Procedures Operation Descriptions Display

1 Connect the power supply to the load again. 0.000V 0.0000A

2.0000

A RV OFF

Press

+ keys.

0.000V 0.0000A

2.0000

A CCL OFF

For the above operating procedures, the corresponding SCPI commands should be:

INP:PROT:CLE ；Clears the protection status

4.10 Error Messages

When an error occurs to the load, the operating procedures are shown below:

1. Press

+ keys to display the error messages.

Example1: When a wrong command is sent, the ERR annunciator will turn red. Check the error

message. The detailed operations are shown below:

Procedures Operation Descriptions Display

Press

+ keys to display the error message.

ERROR -103

2 If an error occurs, repeat the first operation.

3 If no error exists, the EER annunciator is turned off. Repeat the

first operation, and display will shows “NO ERROR”.

NO ERROR

For the above operating procedures, the corresponding SCPI commands should be:

SYST:ERR? ；Queries the error code and error messages

4.11 Triggered Operation

When the triggering mode is EXTernal, the triggered operations are shown below:

1. Set trigger object (please see 2.6.2 section for detailed introduction).。

2. Press

+ keys or trigger terminal (TRIG IN) to receive low TTL level, and a trigger

occurs.

Example1: Select “List” for the trigger function to trigger a sequence operation. The sequence is

the one mentioned in Example1 in 4.6.1 section. The detailed operations are shown below:

Steps Operation Descriptions

Step1 Select “List” in main menu for the trigger function (please see

4.13.5 section for detailed introduction).

Step2

Press

+ 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

+ keys has

the same effect as pressing

+ 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

4.12 Main Menu

The operating procedures for the main menu are shown below:

1. Press

key to enter into the main menu.

2. Use

, keys to select the menu item.

3. Use the knob or

, keys to select the parameter; or use Entry keys or the knob

together with

, keys to input set value. Press key to exit modifying the

parameter or exit the main menu.

4. Press

key to confirm.

5. Press key to exit the main menu.

4.12.1 Loading Default Values

Example: Load the default values. The detailed operations are shown below:

Procedures Operation Descriptions Display

Press

key to enter into the main menu.

Load Default：

Yes *No

Use the knob or

key to select the parameter “Yes”. Press

key to confirm.

Load Default：

*Yes No

Press

key to exit the main menu.

4.12.2 Short Circuit Operation

Example: Short circuit operation in CV mode. The detailed operations are shown below:

Procedures Operation Descriptions Display

Press

key to enter into the main menu.

Load Default：

Yes *No

Use

key to select the menu item “Short”; use the knob or

key to select the parameter “On”. Press key to confirm.

Short

*On Off

Press

key to exit the main menu.

Press

key to enter into the mode selection and parameter

setting menu; use

, keys to select CV mode. Press

key to confirm and exit the mode selection and parameter setting

menu.

0.000V 0.000A

0.000V sCV OFF

Press

key to turn on the load.

0.000V 0.000A

0.000V sCV ON

For the above operating procedures, the corresponding SCPI commands should be:

INPUT:SHORT ON ；Sets the load to short circuit

MODE CV ；Sets the mode

INPUT ON ；Turns on the load

4.12.3 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 below:

Procedures Operation Descriptions Display

Press

key to enter into the main menu.

Load Default：

Yes *No

Use

key to select the menu item “Von Latch”; use the knob

key to select the parameter “Off”. Press key to

confirm.

Von Latch：

*On Off

Use

key to select the menu item “Von Point”; use Entry keys

or the knob together with

, keys to input the voltage

value. Press

key to confirm.

Von Point：

1.000

Press

key to exit the main menu.

0.000V 0.000A

0.000

A CCH OFF

Press

key to turn on the load.

0.000V 0.000A

0.000

A CCH ON

For the above steps, 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

4.12.4 Current Limit in CV Mode

Example: Set the load to CV 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 below:

Procedures Operation Descriptions Display

1 Set the load to CV mode, and set the voltage value to 2V (please

see 4.4 section for detailed operations)

0.000V 0.000A

2.000

V CV OFF

Step2

Press

key to enter into the main menu.

Load Default：

Yes *No

Step3

Use

key to select the menu item “CV Curr Limit”; use Entry

keys or the knob together with

, keys to input the current

limit value to 20A. Press

key to confirm.

CV Curr Limit：

20.000A

Step4

Press

key to exit the main menu.

0.000V 0.000A

2.000

A CCH OFF

Step5

Press

key to turn on the load.

0.000V 0.000A

2.000

A CCH ON

For the above operating procedures, the corresponding SCPI commands should be:

MODE CV ；Sets the mode

VOLT 2 ；Sets the current value to 2V

CV:CURR:LIM 20A ；Sets the current limit value to 20A in CV mode

INPUT ON ；Turns on the load

4.12.5 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; turn on the load; turn off the load. The detailed operations are shown below:

Procedures Operation Descriptions Display

1 Set the load to CCH mode, and set the current value to 2A. ((please

see 4.4 section for detailed operations)

0.000V 0.000A

2.000

A CCH OFF

Press

key to enter into the main menu.

Load Default：

Yes *No

Use

key to select the menu item “Curr Rise Rate”; use Entry

keys or the knob together with

, keys to input the current

value to 0.002A/us. Press

key to confirm.

Curr Rise Rate：

0.002

A/us

Use

key to select the menu item “Curr Fall Rate”; use Entry

Curr Fall Rate：

0.005

A/us

keys or the knob together with , keys to input the current

value to 0.005A/us. Press

key to confirm. 电流值

0.002A/us。按

键确定。

Press

key to exit the main menu.

0.000V 0.000A

2.000

A CCH OFF

Press

key to turn on the load.

0.000V 0.000A

2.000

A CCH ON

Press

key to turn off the load.

0.000V 0.000A

2.000

A CCH OFF

For the above operating procedures, the corresponding SCPI commands should be:

MODE CCH ；Sets the mode

CURR 2 ；Sets the current value to 2A 电流值 2V。

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 上升速率

为 0.005A/us。

INPUT ON ；Turns on the load

INPUT OFF ；Turns off the load

4.12.6 Trigger Function Selection

Example: Select “Tran” in trigger function selection (Trig Function). 选择(Trig Fonction)为

Tran。

Procedures Operation Descriptions Display

Press

key to enter into the main menu.

Load Default：

Yes *No

Use

key to select the menu item “Trig Function”; use the

knob or

key to select the parameter “Tran”. Press key

to confirm.

Trig Function：

*Tran List

Press

key to exit the main menu.

0.000V 0.000A

0.000

A CCH OFF

For the above operating procedures, the corresponding SCPI commands should be:

TRIG:FUNC TRAN ；Selects transient operation (TRAN) for trigger function

4.12.7 Knob Function

Example: Enable the knob function.

Procedures Operation Descriptions Display

Press

key to enter into the main menu.

Load Default：

Yes *No

Use

key to select the menu item “Knob”; use the knob or

Knob：

*On Off

key to select the parameter “On”. Press key to confirm.

Press

key to exit the main menu.

0.000V 0.000A

0.000

A CCH OFF

4.12.8 Key Sound

Example: Enable the key sound.

Procedures Operation Descriptions Display

Press

key to enter into the main menu.

Load Default：

Yes *No

Use

key to select the menu item “Key Sound”; use the knob

key to select the parameter “On”. Press key to

confirm.

Key Sound：

*On Off

Press

key to exit the main menu.

0.000V 0.000A

0.000

A CCH OFF

4.12.9 Communication Interface

Example1: Select RS232 interface; set the baut rate to 9600; set parity check to None; set data bit

to 8; set stop bit to 2; enable the flow control.

Steps Operation Descriptions Display

Step1

Press

key to enter into the main menu.

Load Default：

Yes *No

Step2

Use

key to select the menu item “Interface”; use the knob or

key to select the parameter “RS232”. Press key to

confirm.

Interface：

*RS232 USB GPIB

Step3

Use

key to select the menu item “Baud Rate”; use the knob

, keys to select the parameter “9600”. Press key

to confirm.

Baud Rate：

*9600 19200

Step4

Use

key to select the menu item “Parity Check”; use the

knob or

key to select the parameter “None”. Press key

to confirm.

Parity Check：

*None Even Odd

Step5

Use

key to select the menu item “Data Bit”; use the knob or

key to select the parameter “8”. Press key to confirm.

Data Bit：

*8 7

Step6

Use

key to select the menu item “Stop Bit”; use the knob or

key to select the parameter “2”. Press key to confirm.

Stop Bit：

1 *2

Step7

Use

key to select the menu item “Flow Control”; use the

knob or

key to select the parameter “On”. Press key to

confirm.

Flow Control：

*On Off

Step8

Press

key to exit the main menu.

0.000V 0.000A

0.000

A CCH OFF

Example2: Select GPIB interface, set the address to 18.

Steps Operation Descriptions Display

Step1

Press

key to enter into the main menu.

Load Default：

Yes *No

Step2

Use

key to select the menu item “Interface”; use the knob or

key to select the parameter “GPIB”. Press key to

confirm.

Interface：

RS232 USB *GPIB

Step3

Use

key to select the menu item “GPIB Address”; use Entry

keys or the knob together wit

, keys to select the

parameter “18”. Press

key to confirm.

GPIB Address：

Step4

Press

key to exit the main menu.

0.000V 0.000A

0.000

A CCH OFF

Chapter5 Remote Programming Operation

ARRAY 372x 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 program 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 “ARRAY 372x Series Electronic Load SCPI Programming Guide” for detailed introduction

of all SCPI commands.

5.1 Communication Interface

5.1.1 RS232

RS232 interface is standard. Use the cable shipped with the load to connect the load to a

computer correctly. Select RS232 interface in the MENU, and set the baud rate, parity, data bit, stop

bit, and flow control parameters to be used. Set the same parameters in the software on the computer,

and input the right SCPI command to operate the load.

5.1.2 USB

USB interface is optional. It can be used only when the load has installed USB communication

module and the relevant driver has installed on the computer. Use USB cable to connect the load to a

computer correctly. Select the USB interface in the MENU and input the right SCPI command to

operate the load.

5.1.3 GPIB

GPIB is optional. It can be used only when the load has installed GPIB communication module

and the relevant driver has installed on the computer. Use GPIB cable to connect the load to a

computer correctly. Select the GPIB interface in the MENU, and set GPIB address. Each instrument

you connect to the GPIB interface has a unique address assigned to it. Input the right SCPI command

to operate the load.

5.2 Flow Control Selection

When RS232 interface is used, the flow control can be enabled or disabled. The load provides

two options: ON and OFF. ON: enabling the flow control; OFF: disabling the flow control. When

“OFF” is selected for flow control, the lower baut rate should be set to ensure normal communication.

5.3 Remote Control Annunciators

There is a REM remote control annunciator on the front panel of the load. When the load receives

the remote command (SYSTem:REMote) via RS232 or GPIB interface, the REM remote control

annunnciator 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

and keys). The REM

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 pressing

and keys.

5.4 Sending a Remote Command

You can use the computer to set operation mode and operation parameters remotely for the load.

5.5 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 “MEAS:CURR?” asks the load to return the actual input

current at the Input binding posts. Please refer to “ARRAY 372x Series 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.

5.6 Remote Programming Commands

The SCPI commands have many optional key words for the programmer. Getting familiar with

those 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

“ARRAY 372x Series 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.

5.6.1 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.

5.6.2 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.

5.6.3 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.

5.7 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 level 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.

l "INPUT OFF" ；Turns off the load` s input

2 "MODE VOLT" ；Selects the CV mode

3 "VOLT:TRIG 5” ；Presets the trigger voltage 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, programs the

resistance level to 10Ω, and reads back the computed power.

l. "INPUT OFF" ；Turns off the load` s input

2. "MODE CRM" ；Selects the CRM mode

3. "CURR:PROT:LEV 3;DEL 10" ；Sets the current protection limit to 3A, and 10seconds of time

delay

4. "CURR:PROT:STAT ON" ；Activates the current protection

5. "RES 10" ；Sets resistance level to 10Ω

6. "INPUT ON" ；Turns on the load` s input

7. "MEAS:POW?" ；Measures the input power level

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 CV" ；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 200us" ；Sets transient low level time to 200us

6 "TRAN:HTIM 300us" ；Sets transient high level time to 300us

7 "TRAN:RTIM 10us" ；Sets the time for transient rising edge to 10us

8 "TRAN:FTIM 20us" ；Sets the time for transient falling edge to 20us

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

programs a pulse width of 1 millisecond.

1 "INPUT OFF" ；Turns off the load` s input

2 "MODE CV" ；Selects the CV mode

3 "TRIG:SOUR BUS" ；Selects the bus as the trigger source

4 "VOLT LLEV 0.5" ；Sets the transient low level to 0.5V

5 "VOLT:HLEV 1" ；Sets the transient high level to 1V

6 "TRAN:HTIM 1ms" ；Sets transient high level time to 1ms

7 "TRAN:RTIM 10us" ；Sets the time for transient rising edge to 10us

8 "TRAN:FTIM 10us" ；Sets the time for transient falling edge to 10us

9 "TRAN:MODE PULSE " ；Selects the pulsed transient operation

10 "TRAN ON" ；Activates the transient operation

11 "INPUT ON"

；Turns on the load` s input

12 "*TRG" ；*TRG command generates a 1millisecond high-level pulse at the

load` s input

ARRAY CSI3721A 3721A 400 Watt Programmable DC Electronic Load 0-80V, 0-40A

Product's Documents

User's Manual

Specifications

ARRAY CSI3721A Questions and Answers