Chapter1 General Introduction 1.1 Function Features 1.2 Front Panel 1.3 Rear Panel

Chapter1 General Introduction 1.1 Function Features 1.2 Front Panel 1.3 Rear Panel
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 Selection and Parameter Setting Menu ............................................................5
1.6.3 Transient Operation Menu ...........................................................................................6
1.6.4 List Operation Menu.....................................................................................................6
1.7 Display Messages......................................................................................................................6
1.8 Remote Programming ................................................................................................................9
Chapter2 Functions and Features ......................................................................................................10
2.1 Local and Remote Control ....................................................................................................10
2.2 Main Functions: .....................................................................................................................10
2.3 Basic Test Functions...............................................................................................................11
2.3.1 Constant Current Mode..............................................................................................11
2.3.1.1 Setting Ranges ..................................................................................................11
2.3.1.2 Immediate Current Level ................................................................................12
2.3.1.3 Triggered Current Level ..................................................................................12
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 ..................................................................................................13
2.3.2.2 Immediate Voltage Level .................................................................................13
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 ..............................................................................15
2.3.4 Constant Power Mode (CP)........................................................................................15
2.3.4.1 Setting Ranges ..................................................................................................16
2.3.4.2 Immediate Power Level ...................................................................................16
2.3.4.3 Triggered Power Level .....................................................................................16
2.4 Transient Operation...............................................................................................................17
2.4.1 Continuous Transient Operation ...............................................................................17
2.4.2 Pulsed Transient Operation........................................................................................18
2.4.3 Toggled Transient Mode .............................................................................................20
2.5 List Operation ........................................................................................................................21
2.6 Battery Discharge Operation ................................................................................................22
2.7 Short Circuit Operation.........................................................................................................23
1
2.8 Triggered Operation...............................................................................................................23
2.9 Input Control..........................................................................................................................24
2.9.1 Turning On/Off the Load............................................................................................24
2.9.2 Von Point/Von Latch ...................................................................................................24
2.9.3 Current Limit in CV Mode.........................................................................................25
2.9.4 Current Rise Rate........................................................................................................26
2.9.5 Current Fall Rate ........................................................................................................26
2.10 Measurement Function ........................................................................................................27
2.11 Saving and Recalling ............................................................................................................27
2.12 Reading Remote Programming Errors ..............................................................................28
2.13 Status Report ........................................................................................................................29
2.14 Protection Function..............................................................................................................29
2.14.1 Clearing Latched Protection ....................................................................................29
2.14.2 Overvoltage................................................................................................................29
2.14.3 Overcurrent ...............................................................................................................29
2.14.4 Overpower .................................................................................................................30
2.14.5 Overtemperature.......................................................................................................30
2.14.6 Reverse Voltage..........................................................................................................30
2.15 Auxiliary Functions..............................................................................................................30
2.15.1Trigger Function Selection ........................................................................................30
2.15.2 Knob Function...........................................................................................................30
2.15.3 Key Sound ..................................................................................................................30
Chapter3 Installation...........................................................................................................................31
3.1 Initial Check .........................................................................................................................31
3.2 Environment/Installation Location.................................................................................31
3.3 Power-On/ Self-Test ...........................................................................................................31
3.4 Connections on the Rear Panel ......................................................................................32
3.5 Connections on the Front Panel.....................................................................................33
3.6 Wiring.....................................................................................................................................33
Chapter 4 Local Operation .................................................................................................................35
4.1 Local Control..........................................................................................................................35
4.2 Main Operation on the Front Panel .....................................................................................35
4.3 Connecting to the Power Supply...........................................................................................35
4.4 Turning the Input On/Off......................................................................................................36
4.5 Basic Operation ......................................................................................................................36
4.5.1 CC Mode ......................................................................................................................36
4.5.2 CV Mode ......................................................................................................................38
4.5.3 CR Mode.......................................................................................................................39
4.5.4 CP Mode......................................................................................................................41
4.6 Short Circuit Operation.........................................................................................................42
4.7 Transient Operation...............................................................................................................44
4.7.1 Continuous Transient Operation .......................................................................44
4.7.2 Pulsed Transient Operation ...............................................................................46
4.7.3 Toggled Transient Operation .............................................................................47
2
4.8 List Operation ...................................................................................................................48
4.8.1 List Editing ..................................................................................................................50
4.8.2 Modifying, Adding, Inserting, Deleting the List .......................................................52
4.8.3 Starting/Stopping the List...........................................................................................54
4.9 Battery Discharge Operation ................................................................................................54
4.10 Saving and Recalling............................................................................................................56
4.11 Clearing Protection Settings................................................................................................57
4.12 Error Messages.....................................................................................................................58
4.13 Triggered Operation.............................................................................................................58
4.14 Main Menu............................................................................................................................58
4.14.1 Loading Default Values.............................................................................................59
4.14.2 Short Circuit Operation............................................................................................59
4.14.3 Von Point/Von Latch .................................................................................................60
4.14.4 Current Limit in CV Mode.......................................................................................60
4.14.5 Current Rise/Fall Rate in CC Mode ........................................................................61
4.14.6 Trigger Function Selection........................................................................................62
4.14.7 Knob Function...........................................................................................................62
4.14.8 Key Sound ..................................................................................................................62
4.14.9 Communication Interface.........................................................................................63
Chapter5 Remote Programming Operation ......................................................................................64
5.1 Communication Interface......................................................................................................64
5.1.1 RS232............................................................................................................................64
5.1.2 USB...............................................................................................................................64
5.1.3 GPIB.............................................................................................................................64
5.2 Flow Control Selection...........................................................................................................65
5.3 Remote Control Annunciators ..............................................................................................65
5.4 Sending a Remote Command ................................................................................................65
5.5 Returning Data.......................................................................................................................65
5.6 Remote Programming Commands .......................................................................................65
5.6.1 Modes ...........................................................................................................................65
5.6.2 Transient Levels...........................................................................................................65
5.6.3 Programmable Current Protection............................................................................66
5.8 CV Mode Examples................................................................................................................66
5.9 CR Mode Examples................................................................................................................66
5.10 Continuous Transient Operation Example ........................................................................66
5.11 Pulsed Transient Operation Example.................................................................................67
Specifications ........................................................................................................................................67
3
Chapter1 General Introduction
ARRAY 372x Series programmable electronic load, as a new generation of product developed by
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 scientific research and production fields such as aerospace, shipbuilding,
automotive electronics, solar cell, and fuel cell.
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 functions and features of ARRAY372x Series:
z 4 basic test functions: CC,CV, CR, and CP; 8 basic operating modes: CCL, CCH, CV, CRL,
CRM, CRH, CPV, CPC;
z The 24 bits A/D and 17 bits 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 (3720/3721).
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
z
z
z
z
z
z
z
z
z
z
z
Perfect protection assures high reliability in the most complicated test environments;
Innovative design of CPV and CPC modes effectively improves the practicability of CP
mode;
Circuit improvement greatly enhances the dynamic response of CR mode and widens the
application scope of that mode;
High-speed transient operation with a maximum test frequency of 50kHz:
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;
The input binding posts with their innovative design are especially suitable for large current
testing;
Provides short-circuit test, battery discharge test and other auxiliary functions;
A high-efficiency, intelligent cooling system can effectively reduce system temperature and
enhance power density;
Automatic ON/OFF function simplifies test operation;
Knobs and digital keypad makes the operation more convenient;
Save/recall function can save multiple groups of general settings;
Supports SCPI (Standard Commands for Programmable Instrumentation) and Labview, and
provides necessary PC software;
1
1.2 Front Panel
Fig. 1-1 Front Panel
LCD
Function key
sense terminal
Power switch
Input binding posts
Annuciators
External trigger input terminal
Knob
Switch key for secondary function
Remote
Entry keys/secondary function keys
Left&Right key
Up &
Down key/Display-switching key
1.3 Rear Panel
Fig1-2 Rear Panel
AC input socket
(optional)
Line voltage switch
Fuse holder
Air outlet
2
RS232 Interface
GPIB or USB
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
relevant key.
List 1-1 Description for Keys
0/Local key
1/Save key
2/Recall key
3/Error code display key
4/List start key
5/List stop key
6/Battery discharge operation key
7/Insert key
8/Delete key
9/ 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
3
key first, then press the
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 operating modes.
1.5 Annunciators
REM
Indicates that the electronic load is in remote status.
ERR
Indicates that a remote programming error 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
4
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 selection
USB Interface
GPIB Interface
GPIB Address
5
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 +
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 Selection and Parameter Setting Menu
Press
key to enter into mode selection 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
5
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 List Operation Menu
Press
Press
key +
and
Edit with the knob or
key 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)
keys in list operation menu to select Data: <New/Edit>, and select New 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
6
① CC Mode:
The first line shows measured 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 measured 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 measured 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:
7
The first line shows measured 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 measured voltage and current levels. The second line shows set level,
transient operation mode (tCCH indicates high current mode transient operaion; tCCL indicates
low current mode transient operaion; tCV indicates constant voltage mode transient operaion;
tCRL indicates low resistance mode transient operaion; tCRM indicate medium resistance mode
transient operaion and tCRH indicates high resistance mode transient operaion. “t” indicates
transient operation), and input status of the load: (ON, OFF).
⑥ List Operation:
The first line shows measured voltage and current levels. The second line shows set level,
sequence operation mode (LCCH indicates high current mode list operaion; LCCL indicates low
current mode list operaion; LCVindicates constant voltage mode list operation; LCRL indicates
low resistance mode list operaion; LCRM indicate medium resistance mode list operaion and
LCRH indicates high resistance mode list operaion. “L” indicates list test; and input status of the
load: (ON, OFF).
⑦ Battery Discharge Operation:
The first line shows measured voltage and current levels. The second line shows battery
capacity and discharge time.
⑧ Short Circuit Operation:
8
The first line shows measured voltage and current levels. The second line shows set level in
short circuit (Take 3721A as an example, short circuit test current in CCL is 4.4A; short circuit
test current in CCH is 44A; short circuit test voltage in CV is 0V; short circuit test resistance in
CRL is 0.018Ω; short circuit test resistance in CRM is 1.8Ω; short circuit test resistance in CRH
is 18Ω; short circuit test power in CPV is 420W; short circuit test power in CPC is 0W), short
circuit operation mode (sCCL,sCCH,sCV,sCRL,sCRM,sCRH,sCPC,sCPV; “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.
9
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 keypad and knobs in 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. The REM annunciator is turned on,and remote control goes into effect as soon as the load
receives a SYSTem:REMote command via RS232, USB or GPIB.
Under remote control status, all operations on front panel keypad and knobs become invalid
(except
key +
key ). All operations on electronic load are controlled by remote controller.
The electronic load will return to local control and REM remote control annunciator is turned off after
receiving the return command( SYSTem:LOCal). Or you can return the electronic load to local control
by pressing
key +
key
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 Main Functions:
z
z
z
z
z
z
z
z
CC(constant current) Mode: CCL, CCH
CV(constant voltage) Mode: CV
CR(constant resistance) Mode: CRL, CRM, CRH
CP(constant power) Mode: CPV, CPC
Transient Operation: Tran
List Operation: LIST
Battery Discharge Operation: BATTERY
Short Circuit Operation (Short)
10
2.3 Basic Test Functions
There are four basic test funcitons: constant current (CC), constant voltage (CV), constant resistance
(CR), constant power (CP) and eight basic operating modes: CCL, CCH, CV, CRL, CRM, CRH, CPV and
CPC.
The operating mode and the associated parameters can be set via front panel or remote command.
The load will remain in current 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 constant current in accordance with the programmed value
regardless of the change of 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
Input the current level via the Entry keys or the knob with
and
and
keys. Use
keys.
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
The setting ranges for different models of load are listed as follows:
Mode
Model
3720A
3721A
3722A
3723A
CCL
0~3A
0~40A
0~2A
0~3A
CCH
0~30A
0~40A
0~20A
0~30A
If the range is changed in CC mode while the load’s input stays in 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 change with
the current level to fit the new range. Take 3721A as an example, the present setting is CCH 10.000A,
11
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 operation will be described in later
chapter. The status register of the electronic load can keep track of pending triggers and other
operating conditions, which 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:HIGH <NRf+>,
CURRent:LOW <NRf+>).
2.3.1.5 Software Current Limit
The electronic load allows the user to set a current limit (the current range is the same as that in
CCH mode ) via remote command. 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. Remote commands are listed as follows:
CURRent:PROTection <NRf+>
CURRent:PROTection:DELay <NRf+>
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 constant value regardless of the change of input current. (see Fig.2-2). Press
basic mode to enter into mode selection and parameter setting menu. Choose CV mode with
keys. Input the voltage value via the Entry keys or the knob with
12
and
key in
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 ranges for different models of load are listed as follows:
Model
3720A
3721A
3722A
3723A
Voltage
0~80V
0~80V
0~200V
0~200V
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 in
CV mode.
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 operation will be described in later
chapter. The status register of the electronic load can keep track of pending triggers and other
operating conditions. which 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:HIGH <NRf+>,
VOLTage:LOW<NRf+>).
2.3.3 Constant Resistance Mode (CR)
13
Constant resistance mode has three ranges: the low range (CRL), the medium range (CRM), and
the high range (CRH). In CR mode, the load is equivalent to a constant resistance and 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
menu. Choose CR mode with
the knob with
and
key in basic mode to enter into mode selection and parameter setting
and
keys. Input the resistance value via the Entry keys or
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
The setting ranges for different models of load are listed as follows:
Mode
Model
3720A
3721A
3722A
3723A
CRL
0.02~2Ω
0.02~2Ω
0.0666~6.66Ω
0.0666~6.66Ω
CRM
2~200Ω
2~200Ω
6.66~666Ω
6.66~666Ω
CRH
20~2000Ω
20~2000Ω
66.6~6660Ω
66.6~6660Ω
If the range is changed in CR mode while the load’s input stays in 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 change
with the resistance range to fit the new range. Take 3721A 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 (
in CR mode.
2.3.3.3 Triggered Resistance Level
14
) and the knob
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 operation will be described in
later chapter. The status register of the electronic load can keep track of pending triggers and other
operating conditions, which 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:HIGH<NRf+>, RESistance:LOW <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
and
keys. Use
keys. Input the power value via Entry keys or the knob with
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
15
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 need 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 for the insufficient power. When the load
detects that the power of the external power supply is insufficient, it will try to find constant power
point automatically till the set power is met.
2.3.4.1 Setting Ranges
The setting ranges for different models of load are listed as follows:
Model
3720A
3721A
3722A
3723A
Power
0~250W
0~400W
0~200W
0~350W
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 operaion will be described in later
chapter. The status register of the electronic load can keep track of pending triggers and other
16
operating conditions, which 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 and CR modes, and has three operating statuses:
Continuous, Pulsed, and Toggled. Please make sure the 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 and CR modes share the same setting ranges.
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 operating mode
that needs transient test.
Note: In transient test, the Von point and current limit should be taken into consideration, which
may cause the shut down of the input, thus interrupt the transient test.
2.4.1 Continuous Transient Operation
In continuous operation, the load periodically switches between high/low levels. The relevant
parameters such as low level (LevelL), high level (LevelH), low level time (TimeL), high level time
(TimeH), time for rising edge (TimeR), time for falling edge (TimeF), 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
17
TimeR :
TimeF :
Mode :
0.20ms
0.20ms
Cont
Then press
key to turn on the input;
Or via remote command to set:
SCPI Command
Description
TRAN ON
Enables transient operation
CURR:LOW 5
Sets transient current low level to 5A
CURR:HLGH 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 with three stages,
namely rising edge, transient high level, and falling edge, will appear, then the load returns to the
transient low level again. 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:LOW
VOLTage:HIGH
TRANsient:HTIMe
<NRf+>,
<NRf+>,
<NRf+>,
CURRent:HIGH
RESistance:LOW
TRANsient:RTIMe
TRANsient:MODE PULSe, TRANsient ON | OFF).
18
<NRf+>,
<NRf+>,
<NRf+>,
VOLTage:LOW
<NRf+>,
RESistance:HIGH
<NRf+>,
TRANsient:FTIMe
<NRf+>,
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 +
key, or ,the remote
command (*TRG/.TRIGger). 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
CURR:LOW 5
Sets transient current low level to 5A
CURR:HIGH 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 operating mode
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 its
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).
19
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:LOW <NRf+>, CURRent:HIGH
<NRf+>,
VOLTage:LOW
RESistance:HIGH
<NRf+>,
<NRf+>,
VOLTage:HIGH
TRANsient:RTIMe
<NRf+>,
<NRf+>,
RESistance:LOW
TRANsient:FTIMe
<NRf+>,
<NRf+>,
TRANsient:MODE TOGGle, TRANsient ON | OFF).
The trigger can be an external trigger signal received via the TRIG input on the front panel,
pressing the
key +
key, or the remote command ( *TRG/TRIGger).
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
CURR:LOW 5
Sets transient current low level to 5A
CURR:HIGH 10
Sets transient current high level to 10A
20
TRAN:RTIM 100us
TRAN:FTIM 200us
TRAN:MODE TOGG
INPUT ON
Sets the time for transient rising edge to 100us
Sets the time for transient falling edge to 200us
Selects toggled operating mode
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 its
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 List Operation
Besides Transient operation, the electronic load provides more flexible list operation, which can
make the load operate according to the preset sequence.
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 4 for detailed information about
programming lists from the front panel.
21
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, thus interrupt the list operation.
2.6 Battery Discharge Operation
The electronic load adopts constant current discharge to test battery capacity. The discharge
current and cut-off voltage can be self-defined. When the battery voltage decreases to the cut-off
voltage, the battery discharge test will stop 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 for different models is listed as follows:
Model
3720A
3721A
3722A
3723A
Capacity
3000Ah
4000Ah
2000Ah
3000Ah
.
Fig. 2-10 Voltage/Current Curve Chart in Battery Discharge Operation
22
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). The other set values will not be changed when the short
circuit operation is enabled. The short-circuit value depends on the present operating mode of the load,
and the short-circuit value for each model is shown as follows:
Mode
Model
3720A
3721A
3722A
3723A
CCL
3.3A
4.4A
2.2A
3.3A
CCH
33A
44A
22A
33A
CV
0V
0V
0V
0V
CRL
0.018Ω
0.018Ω
0.06Ω
0.06Ω
CRM
1.8Ω
1.8Ω
6Ω
6Ω
CRH
18Ω
18Ω
60Ω
60Ω
CPV
270W
420W
220W
370W
CPC
0W
0W
0W
0W
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, thus interrupt the short circuit operation.
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
Transfer 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
Gernerate a transient pulse in accordance with the preset transient parameters, when pulsed
transient operation is active.
z Triggering a transient toggle
Switch 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
Enable 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
of the load can be used to trigger as well.
23
key +
key on the front panel
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
z
The EXTernal mode: Choose the External trigger input terminal or
key +
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..
The HOLD mode: Use TRIGger:IMMediate command as the trigger source. At this time,
all other triggering methods including *TRG become invalid.
Note: The TRIGger:IMMediate command 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 Turning On/Off the Load
The input can be turned on/off by pressing
ON/OFF). If the load’s input stays in OFF status, press
input stays in ON status, press
key, or via the remote command (INPUT
key to turn on the input; if the load’s
key to turn off the input. Turning the input on/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, 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 automatical 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:LATCh:VOLTage
<NRf+>).
The Von Latch can be set in main menu, or via the remote command (INPut:LATCh ON | OFF).
24
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 ( INPut:LIMit:CURRent
<NRf+>).
25
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 actual rise rate is
one tenth of the set level 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:
26
Fig.2-15 Current Fall Rate
Note: The Curr Fall Rate can be effective only in CCH and CCL mode, and the actual rise rate is
one tenth of the set level 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
remote
command
(MEASure:VOLTage?,
MEASure:CURRent?,
MEASure:RESistance?, MEASure:POWer?).
2.11 Saving and Recalling
The electronic load is provided with an EEPROM memory, which can save various parameters,
such as modes, input status, current, voltage, resistance, transient settings, limits, etc. 372x Series
electronic load can save 10 groups of parameters. All parameters relevant to saving and recalling
operation are listed in List 2-1 (Take 3721A as an example.).
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
0A
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
27
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
0V
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.
The 10 groups of parameters stored in Location 0~9 can be saved and recalled by pressing
key +
key and
key +
key, or via the remote command (*SAV < NRl > and *RCL
< NRl >).
The parameter saved in Location 0 will be recalled automatically every time the load is turned on.
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 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.
28
2.13 Status Report
The electronic load incorporates a status reporting register. Various status conditions of the load
can be reported by querying the status register. The user can make sure which event has been reported
through setting the enable register, which 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 pressing
key +
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
key +
key or 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
29
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.
SCIP Command
Description
CURRent:PROTection:STATe ON/OFF
Turns on/off the current protection limit function
CURRent:PROTection<NRf+>
Sets the current limit level
CURRent:PROTection:DELay < NRf+>
Sets the delay time to turn off the input
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.
30
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 or 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 50 °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 from 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, before the load is switched on, 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 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
31
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 of 372x Series electronic load 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.
Fig. 3-1
AC input:
AC power-line cord must be appropriate for your local standard.
The specifications of the fuse: 250V 315mA.
Line voltage switch can select 110V or 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, and 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
32
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.
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 of 372x Series electronic load on the front panel include input terminals
(INPUT+, INPUT-), remote sense terminals (SENSE +, SENSE -), and an external trigger
input terminal. See Fig. 3-2.
Fig.3-2
Input Connections
Input connections are made to two binding posts (INPUT+, INPUT-) on the front panel.
The maximum wire diameter is 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 Terminals
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.
372x Series electronic load can detect remote voltage inputs automatically, so there is no
need to modify the parameter settings or change the hardware wiring when using remote
sensing.
External Trigger Input Terminal
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. In order to get a reliabale trigger, the duration time of low level
should be longer than 10us.
3.6 Wiring
Sense Connections
As the influence of connected power and the conductor resistance of the load, the voltage
at the input terminals will be lower than output voltage when the current flows across the load,
When greater accuracy of voltage test is needed, it is necessary to connect Sense input,
33
and the load will switch to Sense status automatically. The relevant wiring is shown as fig.3-3.
Fig.3-3
Parallel Connections
Figure 3-4 illustrates how two or more loads can be paralleled in CC mode when high
power or large current is needed.
Fig. 3-4
34
Chapter 4 Local Operation
The local operation of the load has been briefly introduced in Chapter 2. In this chapter, it will be
explained in details with examples.
4.1 Local Control
If it is needed to control the load from 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
key +
key). 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 (SYST:LOCal). Or
you can return the electronic load to local control by pressing
4.2 Main Operation on the Front Panel
z
z
z
z
z
z
z
z
z
z
z
z
z
z
z
z
z
Connecting to the Power Supply
Turning the Input On/Off
CC Mode
CV Mode
CR Mode
CP Mode
Short Circuit Operation
Continuous Transient Operation
Pulsed Transient Operation
Toggled Transient Operation
List Operation
Battery Discharge Operation
Saving and Recalling Parameters
Clear Protection Settings
Error Messages
Triggered Operation
Main Menu
4.3 Connecting to the Power Supply
35
key +
key.
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. In this case, disconnect the power supply from the
load and then make the correct connections.
After the power supply is correctly connected to the load, press
key +
key to clear the
RV protection status or restart the load. 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 Operation
The operating procedures for basic tests are shown below:
key to enter into mode selection and parameter setting menu.
1.
Press
2.
Use
3.
Use Entry keys, or use the knob together with
,
keys to select one operating mode.
,
keys to input set value.
key
may be used to clear the values entered at present, or exit mode selection and parameter
setting menu..
4.
Press
key to confirm and exit mode selection and parameter setting menu
5.
Press
key to turn on the load’s input..
4.5.1 CC Mode
Constant current mode has two ranges, the high range (CCH) and the low range (CCL).
Example 1: Take 3721A as an example, in CV mode, set the load to CCH, the current to
5.12A,,and turn on the load. The operating procedures are shown below:
Procedures
1
Operation Descriptions
Press
Display
key to enter into the mode selection and
parameter setting menu (e.g: the load is in CV mode).
2
Use
or
key to select CCH.
Use Entry keys, or use the knob together with
3
4
,
Press
keys to input the current value to 5.12.
key to confirm and exit mode selection
and parameter setting menu.
36
MODE: CV
CURR: 80.000A
MODE: CCH
CURR: 0.000A
MODE: CCH
CURR: 5.120A
5.000V
5.120A
0.000A
CCH OFF
5
6
Press
5.000V
5.120A
key to turn on the load.
,
Use
key to check the current power
value.
0.000V
5.120A
5.120A
CCH ON
0.000A
0.000W
For the above operating procedures, the corresponding SCPI commands should be:
MODE
CCH
;Sets the mode
CURR
5.1
;Sets the current value
INP
ON
;Turns on the load
Example 2: Current setting is 5.8A in CCH, input is on.
Solution 1:
Procedures
1
Operation Descriptions
Press
Display
key to enter into the mode selection and
parameter setting menu.
Use Entry keys, or use the knob together with
,
2
keys to input the current value to 5.8.
3
Press
key to confirm and exit the mode
selection and parameter setting menu.
4
Press
MODE: CCH
CURR: 5.120A
MODE: CCH
CURR: 5.800A
5.000V
5.800A
5.800A
CCH ON
0.000V 0.000A
5.800A CCH ON
key to turn on the load.
Solution 2:
Procedures
Operation Descriptions
Display
0.000V
0.000A
5.120A CCH OFF
1
Move the cursor to the hundredths with
2
Rotate the knob to set the hundredths to 0.
(Rotating the knob will change the set value
immediately. And when the load is powered on, the
new set value will become valid at the input terminal
at once.)
0.000V
0.000A
5.100A CCH OFF
3
Move the cursor to the tenths with
5.000V 5.100A
5.100A CCH ON
4
Rotate the knob to set the tenths to 8.
(Rotating the knob will change the set value
immediately. And when the load is powered on, the
new sett value will become valid in the input
terminal at once.)
key.
key.
37
5.000V 5.800A
5.800A CCH ON
5
Press
0.000V 0.000A
5.800A CCH ON
key to turn on the load.
For the above operating procedures, the corresponding SCPI commands should be:
MODE
CCH
;Sets the mode
CURR
5.8
;Sets the current value
INP
ON
;Turns on the load
Note: In CCH status or CCL status, CCH /CCL will be shown respectively in the lower right
corner of the display.
4.5.2 CV Mode
Example 1: Take 3721A as an example, set the load to CV mode and the voltage value to 50V in
CCH. Then turn on the load, and check the present power value. The operating procedures are shown
below:
Procedures
1
Operation Descriptions
Press
Display
key to enter into the mode selection and
MODE:CCH
CURR: 3.800A
parameter setting menu.
2
3
Use Entry keys or use the knob together with
,
4
MODE:CV
VOLT: 80.000V
key to select CV mode.
Use
Press
keys to input the voltage value to 50.
key to confirm and exit the mode
MODE:CV
VOLT: 50.000V
0.000V 0.000A
50.000V CV OFF
selection and parameter setting menu.
5
6
Press
0.000V 0.000A
50.000V CV ON
key to turn on the load.
Check the present power value with
,
0.000V 0.000A
50.000V 0.000W
keys.
For the above operating procedures, the corresponding SCPI commands should be:
MODE
CV
;Sets the mode
VOLT
50
;Sets the voltage value
INP
ON
;Turns on the load
Example 2: 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
1
Operation Descriptions
Press
Display
key to enter into the mode selection and
parameter setting menu.
38
MODE:CV
CURR: 50.000V
2
Use Entry keys or use the knob together with
,
MODE:CV
VOLT: 60.000V
keys to input the voltage value to 60.
3
Press
key to confirm and exit the mode
0.000V 0.000A
60.000V CV OFF
selection and parameter setting menu.
4
0.000V 0.000A
60.000V CV ON
key to turn on the load.
Press
Solution 2:
Procedures
1
2
3
Operation Descriptions
Display
0.000V 0.000A
50.000V CV ON
key.
Move the cursor to the tens with
Rotate the knob to set the tens to 6.
(Rotating the knob will change the set value
immediately.. The set value will become effective at
input at once when the load is turned on.)
0.000V 0.000A
60.000V CV ON
key to turn on the load.
Press
0.000V 0.000A
60.000V CV OFF
For the above operating procedures, the corresponding SCPI commands should be:
MODE
CV
;Sets the mode
VOLT
60
;Sets the voltage value
INP
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).
Example 1: Take 3721A as an example, set the load to CRL and set the resistance value to 1.5Ωin
CV mode. Turn on the load, and check the present power value. The operating procedures are shown
below:
Procedures
1
Operation Descriptions
Press
Display
key to enter into the mode selection and
MODE:CV
CURR: 50.000V
parameter setting menu.
2
3
Use
MODE: CRL
RES : 0.0200Ω
key to select CRL.
Use Entry keys or use the knob together with
keys to input the resistance value to 1.5.
39
,
MODE: CRL
RES : 1.5000Ω
4
Press
key to confirm and exit the mode
0.000V
1.5000Ω
0.000A
CRL OFF
0.000V
1.5000Ω
0.000A
CRL ON
0.000V
1.5000Ω
0.000A
0.000W
selection and parameter setting menu.
5
6
Press
key to turn on the load.
,
Check the present power value with
.
For the above operating procedures, the corresponding SCPI commands should be:
MODE
CRL
;Sets the mode
RES
1.5
;Sets the resistance value
INP
ON
;Turns on the load
Example 2: 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
1
Operation Descriptions
Press
Display
key to enter into the mode selection and
MODE: CRL
RES : 1.5000Ω
parameter setting menu.
2
Use Entry keys or use the knob together with
,
MODE: CRL
RES : 1.8000Ω
keys to input the resistance value to 1.8.
3
Press
key to confirm and exit the mode
0.000V
1.8000Ω
0.000A
CRL OFF
0.000V
1.8000Ω
0.000A
CRL ON
selection and parameter setting menu.
4
Press
key to turn on the load.
Solution 2:
Procedures
1
2
3
Operation Descriptions
Display
key.
Move the cursor to the tenths with
Rotate the knob to set the tenths to 8.
(Rotating the knob will change the set value
immediately. The set value will become effective at
input at once when the load is turned on.)
Press
key to turn on the load.
0.000V
1.5000Ω
0.000A
CRL OFF
0.000V
1.8000Ω
0.000A
CRL OFF
0.000V
1.8000Ω
0.000A
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
INP
ON
;Turns on the load
40
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).
Example 1: Take 3721A as an example, set the load to CPV and set the power value to 100W in
CRL. Turn on the load, and check the present power value. The operating procedures are shown
below:
Procedures
1
Operation Descriptions
Press
Display
key to enter into the mode selection and
MODE: CRL
RES: 1.8000Ω
parameter setting menu.
2
3
Use
MODE: CPV
POWR: 0.000W
key to select CPV.
,
Use Entry keys or use the knob together with
MODE: CPV
POWR: 100.00W
keys to input the power value to 100.
4
Press
key to confirm and exit the mode
0.000V
0.000A
100.00W CPV OFF
selection and parameter setting menu.
5
6
Press
0.000V
0.000A
100.00W CPV ON
key to turn on the load.
,
Check the present power value with
0.000V
100.00W
.
0.000A
0.000W
For the above operating procedures, the corresponding SCPI commands should be:
MODE
CPV
;Sets the mode
POW
100
;Sets the power value
INP
ON
;Turns on the load
Example 2: 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
1
Operation Descriptions
Press
Display
key to enter into the mode selection and
MODE: CPV
POWR: 100.00W
parameter setting menu.
2
Use Entry keys or use the knob together with
keys to input the power value to 200.
41
,
MODE: CPV
POWR: 200.00W
3
Pres
key to confirm and exit the mode
0.000V
200.00W
0.000A
CPV OFF
0.000V
200.00W
0.000A
CPV ON
selection and parameter setting menu.
4
Press
key to turn on the load.
Solution 2:
Procedures
1
Operation Descriptions
Display
Move the cursor to the hundredths with
2
key.
Rotate the knob to set the hundredths to 2.
(Rotating the knob will change the set value
immediately. The set value will become effective at
input at once when the load is turned on.)
3
Press
key to turn on the load.
0.000V
100.00W
0.000A
CPV OFF
0.000V
200.00W
0.000A
CPV OFF
0.000V
200.00W
0.000A
CPV ON
For the above operating procedures, the corresponding SCPI commands should be:
MODE
CPV
;Sets the mode
POW
200
;Sets the power value
INP
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:
key to enter into main menu, and select Short (short circuit) item with
1. Press
key.
key or knob to set On, and press
2. Use
3. Press
key to confirm.
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 operating mode; press
,
key to confirm and exit the mode
selection and parameter setting menu.
5. Press
key to turn on the load.
Example 1: 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.
42
Procedures
1
Operation Descriptions
Press
Display
key to enter into main menu, and select Short
(short circuit) item with
2
Use
Short:
On *Off
key.
key or knob to set On, and press
key to
Short:
*On Off
confirm.
3
Press
key to exit the main menu. The display shows “s”
0.000V 0.000A
0.000V sCV OFF
to indicate in CV mode.
4
Press
key to enter into the mode selection and parameter
setting menu; use
key to select CCH; press
0.000V 0.000A
44.000A sCCH OFF
key to
confirm and exit the mode selection and parameter setting
menu.
5
Press
0.000V 0.000A
44.000A sCCH ON
key to turn on the load.
For the above operating procedures, the corresponding SCPI commands should be:
INP:SHOR
ON
; Sets the load to short circuit operation
MODE
CCH
; Sets the mode
INP
ON
; Turns on the load
Example 2: Based on the last example, exit the short circuit operation, and turn off the load.
Procedures
1
Operation Descriptions
Press
key to enter into main menu, and select Short
(short circuit) item with
2
Use
Display
Short:
*On Off
key.
key or knob to set Off, and press
key to
Short:
On *Off
confirm.
3
Press
key to exit the main menu. On the display, “s”
0.000V 0.000A
0.000A CCH ON
disappears in CCH status.
4
Press
0.000V 0.000A
0.000A CCH OFF
key to turn off the load.
For the above operating procedures, the corresponding SCPI commands should be:
INP:SHOR
OFF
;Sets the load to exit the short circuit operation
INP
OFF
;Turns on the load
43
4.7 Transient Operation
The operating procedures for transient operation are shown below:
key to enter into the mode selection and parameter setting menu; use
1. Press
keys to select one basic operating 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
4. Use
key to enter into the transient operation menu.
,
keys to select the parameter.
5. Use Entry keys or use the knob together with
,
LevelH, TimeL, TimeH, TimeR, and TimeF. Use
keys to set values for LevelL,
,
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 +
key or the signal at the trigger input terminal (TRIG IN) is
low level.
4.7.1 Continuous Transient Operation
Example 1: Take 3721A as an example, set the load voltage value to periodically switch between
1V and 5V; set the time for rising edge (TimeR) to 10ms; set high level time (TimeH) to 200ms; set
time for falling edge (TimeF) to 20ms; set low level time (TimeL) to 400ms, and the load is in
continuous transient operation. The operating procedures are shown as below:
Procedures
1
Operation Descriptions
Press
Display
key to enter into the mode selection and parameter
setting menu; use
,
0.000V 0.000A
0.000V CV OFF
keys to select CV 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 CV mode.
44
0.000V 0.000A
80.000V tCV OFF
3
4
Use Entry keys or use the knob together with
to set LevelL to 1, and press
5
Use Entry keys or use the knob together with
,
keys
,
keys
,
keys
LevelL:1.000V
►LevelH:80.000V
►TimeL
:530.00ms
TimeH :500.00ms
key to confirm.
Use Entry keys or use the knob together with
to set TimeL to 400ms, and press
7
LevelH:80.000V
key to confirm.
to set LevelH to 5, and press
6
► LevelL:80.000V
key to enter into the transient operation menu.
Press
TimeL :400.00ms
►TimeH :500.00ms
key to confirm.
Use Entry keys or use the knob together with
to set TimeH to 200ms, and press
,
keys
►TimeR:
100.00ms
TimeF: 100.00ms
key to confirm. The
menu will show the next item automatically.
8
Use Entry keys or use the knob together with
to set TimeR to 10ms, and press
9
Use Entry keys or use the knob together with
11
12
Use
,
keys
TimeR: 10.00ms
►TimeF: 100.00ms
key to confirm.
to set TimeF to 20ms, and press
10
,
,
keys
►Mode: ◄
Cont ►
►Mode: ◄
Cont ►
key to confirm.
keys or knob to set Mode value to Cont, and
press
key to confirm.
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:LOW
1
;Sets a value to low level
VOLT:HIGH
5
;Sets a value to high level
45
TRAN:LTIME
TRAN:HTIME
TRAN:RTIME
TRAN:FTIMR
TRAN:MODE
INP
400ms
200ms
10ms
20ms
CONT
ON
;Sets a value to low level time
;Sets a value to high level time
;Sets a value to time for rising edge
;Sets a value to time for falling edge
;Selects continuous transient operation
;Turns on the load
4.7.2 Pulsed Transient Operation
Example 1: Assume that the load is in external triggering mode, set the load current value to
periodically switch between 1A and 5A; set the time for rising edge (TimeR) to10ms; set high level
time (TimeH) to 200ms; set time for falling edge (TimeF) to 10ms; the load is in pulsed transient
operation, and a trigger occurs at this time.
Procedures
1
Operation Descriptions
Display
key to enter into the mode selection and parameter
Press
setting menu; use
,
0.000V 0.000A
0.000A CCH OFF
keys to select CCH mode; press
key to confirm and exit the mode selection and parameter
setting menu.
2
Press
key to enter into transient operation. The display
0.000V 0.000A
0.500A tCCH OFF
shows “t” to indicate in CCH status.
3
4
Press
Use Entry keys or use the knob together with
to set LevelL to 1, and press
5
Press
7
,
keys
,
keys
,
LevelL: 1.000A
►LevelH: 1.000A
►TimeL:400.00ms
TimeH:400.00ms
key to confirm.
key to select TimeH; use Entry keys or use the
knob together with
and press
0.500A
LevelH:1.000A
key to confirm.
Use Entry keys or use the knob together with
to set LevelH to 5, and press
6
►LevelL:
key to enter into the transient operation menu.
► TimeR:10.00ms
TimeF:20.00ms
keys to set TimeH to 200ms,
key to confirm.
Use Entry keys or use the knob together with
to set TimeR to 10ms, and press
,
key to confirm.
46
keys
TimeR:10.00ms
►TimeF:20.00ms
8
Use Entry keys or use the knob together with
to set TimeF to 10ms, and press
9
10
11
12
Use
,
,
keys
►Mode: ◄Cont ►
key to confirm.
keys or knob to set Mode value to pulse, and
►Mode: ◄
Puls ►
press
key to confirm.
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
0.000V 0.000A
5.000A tCCH ON
at the trigger input terminal (TRIG IN) is low level.
For the above operating procedures, the corresponding SCPI commands should be:
MODE
CCH
;Sets the mode
TRAN
ON
;Enables the transient operation
CURR:LOW
1
;Sets a value to low level
CURR:HIGH
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
INP
ON
;Turns on the load
Trig
; One trigger occurs
4.7.3 Toggled Transient Operation
Example 1: 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) to 10ms; set time
for falling edge (TimeF) to 10ms; the load is in toggled transient operation, and a trigger occurs at this
time.
Procedures
1
Operation Descriptions
Press
Display
key to enter into the mode selection and parameter
setting menu; use
,
0.000V 0.000A
20.000Ω CRH OFF
keys to select CRH 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 CRH status.
47
0.000V 0.000A
2000.0Ω tCRH OFF
3
4
Use Entry keys or use the knob together with
to set LevelL to 200, and press
5
Use Entry keys or use the knob together with
and press
,
9
10
11
,
keys
►TimeL:400.00ms
TimeH:200.00ms
TimeR:10.00ms
►TimeF:10.00ms
keys to set TimeR to 10ms,
key to confirm..
Use Entry keys or use the knob together with
Use
LevelL:200.00Ω
►LevelH:2000.0Ω
key to confirm.
to set TimeF to 10ms, and press
8
keys
key to select TimeR; use Entry keys or use the
Press
knob together with
7
,
LevelH:2000.0Ω
key to confirm.
to set LevelH to 500, and press
6
►LevelL:2000.0Ω
key to enter into the transient operation menu..
Press
,
,
keys
►Mode: ◄
Puls ►
key to confirm.
keys or knob to set Mode value to Togg, and
►Mode: ◄Togg ►
press
key to confirm.
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
0.000V 0.0000A
500.00Ω tCRH ON
at the trigger input terminal (TRIG IN) is low level.
For the above operating procedures, the corresponding SCPI commands should be:
MODE
CRH
;Sets the mode
TRAN
ON
;Enables the transient operation
RES:LOW
200
;Sets a value to low level
RES:HIGH
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
INP
ON
;Turns on the load
Trig
; One trigger occurs
4.8 List Operation
48
The operating procedures for sequence operation are shown below:
1. Press
key +
key to enter into list operation menu.
2. Use Entry keys or the knob to select list number (No.), and press
3. Use
key to confirm.
key to select list memo (Memo).
4. Use knob and
5. Use
,
keys to edit memo (max. 10 characters).
key to select sequence data (Data:<New/Edit>). Use
,
keys or
to enter list data clear screen. Use
or knob
knob to select New or Edit operation, and press
6. Select New operation, and press
to select Yes, and press
key to confirm.
to confirm. Now list data will be cleared and the load will
enter the step edit screen. Use
or knob to select No, then press
key to
confirm and return to the list operation menu.
7. Select Edit, then press
8. Use
,
to enter step edit screen.
to select parameters.
9. Use Entry keys or use the knob together with
use the knob/
,
keys to input set value; or
key to select one operating mode, and press
After setting the third parameter, press
key to confirm.
key to confirm and enter into the next
step.
10. If it is needed to modify one step, use
,
keys to select this step. The setting
operations for this step are the same as the operating procedure 9.
11. If it is needed to add one step to the last step, use
key to select the new step. The
setting operations for this new step are the same as the operating procedure 9.
12. If it is needed to insert one step above an edited step, use
,
this edited step. The LCD display doesn`t flash at this time, and press
keys to select
key +
key to insert a new step. The setting operations for this new step are the same as the
operating procedure 9.
13. If it is needed to delete an edited step, use
49
,
keys to select this step. The
LCD display will stop flashing, and press
key +
key to delete. If there is
only one step exists, it will exit the step edit screen.
14. Press
key to exit step edit screen, and save the sequence data in EEPROM
assigned by the sequence number.
15. Use
with
key to select the cycle times (Count); use Entry keys or the knob together
,
keys to input set value. Press
key to confirm and save the cycle
times (Count) in EEPROM assigned by the sequence number.
16. 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
17. Press
key to exit sequence operation menu.
18. Press
key +
key to activate sequence operation.
19. Press
key +
key to stop sequence operation.
key to confirm.
After sequence editing, the operating procedures for enabling and disabling sequence operation
are shown as below:
1.
Press
2.
Use Entry keys or the knob to select list number (No.), and press
3.
Press
key to exit sequence operation menu.
4.
Press
key +
key to activate sequence operation.
5.
Press
key +
key to stop sequence operation.
key +
key to enter sequence operation menu.
key to confirm.
4.8.1 List Editing
Example 1: 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
1
Operation Descriptions
Press
key +
Display
key to enter into sequence operation
menu.
50
►No.:
Memo:
0
2
Use Entry keys or the knob to set the sequence number (No.) to
0, and press
key to confirm (recall the sequence in
►No.:
0
Memo:
EEPROM assigned by the sequence number).
3
4
5
No.:
0
►Memo:_
key to select sequence memo (Memo).
Use
Rotate the knob to select the letter “T”.
No.:
0
►Memo:T
No.:
0
►Memo:T_
key to move the cursor to the right.
Use
6
Rotate the knob to select the letter “e”.
No.:
0
►Memo:Te
7
Set Memo to “Test Power” according to step5 and setp6
No.:
0
►Memo: Test Power
operations. Press
8
9
key to confirm.
►Data:<New/Edit>
Use
key to select Data:<New/Edit>.
Use
key or knob to select New, and press
key to
Clear Data:
Yes *No
key or knob to select Yes, and press
key to
01.
0.00000s
CCH 0.000A
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
01.
1.00000s
CCH 0.000A
Count:
1
confirm.
10
Use
confirm. The data is cleared and step edit screen appears.
11
together with
,
keys to input time to 1s, and press
key to confirm.
12
The basic mode showed in lower left corner of the display
flashes. Use the knob or
CCL, and press
13
key to select operating mode to
01.
1.00000s
CCL 0.000A
key to confirm.
The set value in the lower right corner of the display flashes.
Use Entry keys or the knob together with
input the current value to 1A. Press
,
keys to
01.
1.00000s
CCL 1.0000A
key to confirm and
enter into the next operation.
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
51
06.
CRH
0.00000s
20.000Ω
save the sequence data in EEPROM assigned by the sequence
number.
16
Use
key to select “Count”; use Entry keys or the knob
,
together with
keys to input “5”. Press
Data:<New/Edit>
►Count:
5
key to
confirm and save the Count value in EEPROM assigned by the
sequence number.
17
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
key to confirm and save the Chain value in
“Off”. Press
the EEPROM assigned by the sequence number.
18
19
20
Press
key to exit sequence operation menu.
0.000V 0.000A
0.000A CCH OFF
Press
key +
key to activate sequence operation.
0.000V
1.000A
Press
key +
key to stop sequence operation.
0.000V 0.000A
0.000A CCH OFF
0.0000A
LCCL ON
For the above operating procedures, the corresponding SCPI commands should be:
LIST: NUMB
0
;Recalls the number 0 sequence
LIST:MEMO
“Test Power”
;Sequence memo is “Test Power”
LIST: ADD
CCL,1A,1S
LIST: ADD
CCH,2A,1S
LIST: ADD
CV,1V,1S
LIST: ADD
CRL,1Ω,1S
LIST: ADD
CRH,200Ω,1S
;The above 5 commands are sequence steps
LIST:COUNT
5
;Cycle times for this sequence
LIST:CHA
OFF
;Disables the chained sequence
LIST
ON
;Activates sequence operation
LIST
OFF
;Stops sequence operation
4.8.2 Modifying, Adding, Inserting, Deleting the List
Exampel 1: Based on the example1 in 4.8.1 section, the step 1 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
Step1
Operation Descriptions
Press
key +
Display
key to enter into sequence operation
►No.:
0
Memo: Test Power
menu.
Step2
Use
key to select Data:<New/Edit>.
52
►Data:<New/Edit>
Count:
5
Step3
Use
key to
01.
CCL
1.00000s
1.0000A
key to select time parameter, and the time set value
01.
CCL
1.00000s
1.0000A
01.
CCL
2.00000s
1.0000A
key or knob to select Edit, and press
confirm and enter step edit screen.
Step4
Use
flashes.
Step5
Use Entry keys or the knob together with
the time to 2s, and press
Step6
Step7
,
keys to input
key to confirm.
06.
0.00000s
CRH 20.000Ω
key to select the last new step (Step6).
Use
1.00000s
Add a new step: CCH, 5A, 1S. The set value in the upper right 06.
corner of the display flashes. Use Entry keys or the knob together CRH 20.000Ω
with
,
keys to input time to 1s, and press
key to
confirm.
Step8
The basic mode showed in lower left corner of the display flashes. 06.
1.00000s
CCH 0.000A
key to select operating mode to CCH, and
Use the knob or
press
Step9
key to confirm.
The set value in the lower right corner of the display flashes. Use 06.
CCH
,
keys to input the
Entry keys or the knob together with
1.00000s
5.000A
07.
CCH
0.00000s
0.000A
03.
CV
1.00000s
1.000V
03.
CV
0.00000s
0.000V
current value to 5A. Press
key to confirm and enter into the
next operation.
Step10
Step11
Step12
Step13
Step14
Step15
Use
Press
key to select the step3.
key +
key to insert a new step at step3.
Insert a new step: CRL, 1Ω, 10S at step3. The setting operations 03.
10.00000s
for this new step are the same as the operating procedures7 to 9.
CRL 1.0000Ω
Use
02.
1.00000s
CCH 2.000A
key to select the step2.
Press
key +
key to delete the step2.
Press
key to exit step edit screen and save the sequence data
02.
10.0000s
CRL 1.0000Ω
►Data:<New/Edit>
Count:
5
in EEPROM assigned by the sequence number.
Step16
Step17
Use
key to select Chain.
Use Entry keys or the knob to input 0 (it is chained to itself to
53
►Chain:
Off
►Chain:
0
realize continuous execution). Press
key to confirm and
save the Chain value in EEPROM assigned by the sequence
number.
Step18
key to exit sequence operation menu.
Press
0.000V 0.000A
0.000A CCH OFF
For the above operating procedures, the corresponding SCPI commands should be:
LIST:NUMB
0
;Recalls the number 0 sequence
LIST:EDIT
1,CCL,1A,2S
;Modifies the time of Step1 to 2S
LIST:ADD
CCH,5A,1S
;Add CCH,5A, 1S to the last step
LIST:INS
3,CRL, 1Ω,10S
;Inserts the third step
LIST:DEL
2
;Deletes the second step
LIST:CHA
0
;Chians itself
LSIT:SAVE
;Saves list
LIST
ON
;Enables list operation
LIST
OFF
;Disables list operation
4.8.3 Starting/Stopping the List
Example 1: Start the No.0 sequence, and stop the active sequence operation.
Steps
Step1
Step2
Operation Descriptions
Press
key +
Display
key to enter into sequence operation menu.
►No.:
1
Memo:
Use Entry keys or knob to set the sequence number (No.) to 0, and►No.:
0
Memo: Test Power
press
key to confirm (recall the sequence in EEPROM
assigned by the sequence number).
Step3
Step4
Step5
Press
key to exit sequence operation menu.
0.000V 0.000A
0.000A CCH OFF
Press
key +
key to activate sequence operation.
0.000V
1.0000A
Press
key +
key to stop sequence operation.
0.000V 0.000A
0.000A CCH OFF
For the above steps, the corresponding SCPI commands should be:
LIST: NUMB
0
;Recalls the number 0 sequence
LIST
ON
;Starts sequence operation
LIST
OFF
;Stops sequence operation
4.9 Battery Discharge Operation
Battery discharge operation diagram:
54
0.0000A
LCCL ON
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
key +
3. Press
key to enter into battery discharge parameters edit screen. Use
key to enter into battery discharge operation screen.
to select the parameter. Use Entry keys or the knob together with
termination voltage value and discharge current value. Press
,
,
keys
keys to input
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
key +
key to exit the battery discharge operation.
Example 1: 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
Step1
Operation Descriptions
Press
Display
20.000V
0.000A
0.000A CCH OFF
key to turn off the load, and connect the tested battery
correctly.
Step2
Press
key +
20.000V
0.000A
0.000AH 00:00:00
key to enter into battery discharge
operation screen.
Step3
Press
►MinVolt:0.000V
key to enter into battery discharge parameters edit
screen. Use Entry keys or the knob together with
55
,
keys
DisCurr:2.000A
Step4
to input termination voltage to 15V. Press
key to confirm.
Use Entry keys or the knob together with
,
discharge current to 3A. Press
Step5
Step6
MinVolt:15.000V
►DisCurr:3.000A
keys to input
key to confirm.
Press
key to exit the battery discharge parameters edit screen.
20.000V
0.000A
0.000AH 00:00:00
Press
key to turn on the load, and start battery discharge
20.000V
3.000A
0.000AH 00:00:01
key to turn off the load, and stop battery discharge
20.000V
0.000A
0.012AH 00:00:15
key to clear the discharged time and discharged
20.000V
0.000A
0.000AH 00:00:00
operation.
Step7
Press
operation.
Step8
Press
capacity of the battery.
Step9
key +
Press
key to exit the battery discharge operation.
20.000V
0.000A
0.000A CCH OFF
For the above operating procedures, the corresponding SCPI commands should be:
INP
OFF
;Turns off the load
BATT
ON
;Activates the battery discharge operation screen
BATT:TERM:VOLT
15V
;Sets termination voltage to 15V
BATT:CURR
3A
;Sets discharge current to 3A
INP
ON
;Turns on the load, and start battery discharge operation
INP
OFF
;Turns off the load, and stop battery discharge operation
BATT
OFF
;Exits the battery discharge operation
4.10 Saving and Recalling
The operating procedures for saving and recalling operation are shown below:
1.
Press
key +
key to enter into the saving menu, or press
key +
key
to enter into the recalling menu.
2. Press Entry keys or the knob to select saving or recalling position.
3. Press
key to confirm and exit the saving or recalling menu. If the saving is selected,
the values of List 2-1 parameters will be saved in the specified location in EEPROM; if the
recalling is selected, the values of List 2-1 parameters should be the values saved in
specified location in EEPROM.
Example 1: 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
56
1
Set the mode to CCL; set the current value to 2A; turn on the load ( 0.000V
0.000A
please refer to 4.5.1 for detailed operations).
2.0000A CCL ON
2
Press
3
key +
key to enter into the saving menu.
Press Entry keys or the knob to select the Location 0 for saving.
4
key to confirm and exit the load saving menu.
Press
Save File
No.
1
Save
No.
File
0
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
INP
ON
;Turns on the loas
*SAV
0
;Saves the present settings in Location 0 in EEPROM
Example 2: 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 Location 0 in EEPROM. The detailed operations are shown
below:
Procedures
1
Operation Descriptions
Display
Set the mode to CV; set the voltage value to 40V; turn off the load 0.000V
(please refer to 4.5.2 section for detailed operations).
40.000V
2
Press
3
key +
Recall
No.
key to enter into the recalling menu.
Press Entry keys or the knob to select the recalled Location 0.
4
Press
key to confirm and return.
0.000A
CV OFF
File:
0
Recall File:
No.
0
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
INP
OFF
;Turns off the load
*RCL
0
;Recalls the values saved in location 0 in EEPROM
4.11 Clearing Protection Settings
The operating procedures for clear protection settings are shown below:
1. Eliminate the reason that causes the protection status.
2.
Press
key +
key.
Example 1: Clear RV protection of the load. The detailed operations are shown below:
Procedures
1
2
Operation Descriptions
Display
Connect the power supply to the load again.
0.000V 0.0000A
2.0000A RV OFF
Press
key +
0.000V 0.0000A
2.0000A CCL OFF
key.
For the above operating procedures, the corresponding SCPI commands should be:
57
INP:PROT:CLE
;Clears the protection status
4.12 Error Messages
When an error occurs to the load, the operating procedures are shown below:
1.
Press
key +
key to display the error messages.
Example 1: 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
1
key +
Press
Display
key to display the error message.
2
If there are still erros that have not been examined, repeat the first
operation.
3
If all errors have been checked, the EER annunciator will be turned
off. If repeat the first operation right now, display will shows “NO
ERROR”.
ERROR -103
NO ERROR
For the above operating procedures, the corresponding SCPI commands should be:
SYST:ERR?
;Queries the error code and error messages
4.13 Triggered Operation
When the triggering mode is EXTernal, the triggered operations are shown below:
1. Set pending trigger function (please see 2.8 section for detailed introduction).。
2.
Press
key +
key or trigger terminal (TRIG IN) to receive TTL falling edge, and
a trigger occurs.
Example 1: Select “List” for the trigger function to trigger a sequence operation. The sequence is
the one mentioned in Example 1 in 4.8.1 section. The detailed operations are shown below:
Steps
Operation Descriptions
Step1
Select “List” in main menu for the trigger function (please see
4.14.6 for detailed introduction).
Step2
Press
key +
key or trigger terminal (TRIG IN) to
receive TTL falling edge. The load`s input will change
accordingly when the sequence parameters are changed. Pressing
key +
key has the same effect as pressing
key 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
4.14 Main Menu
The operating procedures for the main menu are shown below:
58
key +
1.
Press
key to enter into the main menu.
2.
Use
3.
Use the knob or
,
together with
keys to input set value. Press
,
keys to select the menu item.
keys to select the parameter; or use Entry keys or the knob
key to exit the parameter
modification or exit the main menu.
4.
Press
key to confirm.
5.
Press
key to exit the main menu.
4.14.1 Loading Default Values
Example: Load the default values. The detailed operations are shown below:
Procedures
1
2
Operation Descriptions
Press
Display
Load Default:
Yes *No
key to enter into the main menu.
key to select the parameter “Yes”. Press
Use the knob or
Load Default:
*Yes No
key to confirm.
3
Press
key to exit the main menu.
4.14.2 Short Circuit Operation
Example: Short circuit operation in CV mode. The detailed operations are shown below:
Procedures
1
2
Operation Descriptions
Press
Use
Display
key to select the menu item “Short”; use the knob or
key to select the parameter “On”. Press
3
4
Load Default:
Yes *No
key to enter into the main menu.
key to confirm.
Press
key to exit the main menu.
Press
key to enter into the mode selection and parameter
setting menu; use
,
Short
*On Off
0.000V 0.000A
0.000V sCV OFF
keys to select CV mode. Press
key to confirm and exit the mode selection and parameter setting
menu.
5
Press
key to turn on the load.
59
0.000V 0.000A
0.000V sCV ON
For the above operating procedures, the corresponding SCPI commands should be:
INP:SHORT ON
;Sets the load to short circuit
MODE
CV
;Sets the mode
INP
ON
;Turns on the load
4.14.3 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 turning on/off of the load`s input, which simplifies the test operations
greatly. The detailed operations are shown below:
Procedures
1
2
Operation Descriptions
or
Load Default:
Yes *No
key to enter into the main menu.
Press
Use
Display
key to select the menu item “Von Latch”; use the knob
key to select the parameter “Off”. Press
Von Latch:
*On Off
key to
confirm.
3
Use
key to select the menu item “Von Point”; use Entry keys
or the knob together with
value. Press
4
5
,
Von Point:
1.000V
keys to input the voltage
key to confirm.
Press
key to exit the main menu.
0.000V 0.000A
0.000A CCH OFF
Press
key to turn on the load.
0.000V 0.000A
0.000A CCH ON
For the above steps, the corresponding SCPI commands should be:
INP: LATC
OFF
;Disables the Von Latch
INP: LATC:VOLT
1
;Sets the Von voltage point to 1V
INP
ON
;Turns on the load
4.14.4 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
step1
Step2
Step3
Set the load to CV mode, and set the voltage value to 2V (please
see 4.5.2 section for detailed operations)
Press
Use
key to enter into the main menu.
key to select the menu item “CV Curr Limit”; use Entry
60
0.000V 0.000A
2.000V CV OFF
Load Default:
Yes *No
CV Curr Limit:
20.000A
keys or the knob together with
current limit value to 20A. Press
Step4
Step5
,
keys to input the
key to confirm.
Press
key to exit the main menu.
0.000V 0.000A
2.000A CCH OFF
Press
key to turn on the load.
0.000V 0.000A
2.000A 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
INP:LIM:CURR 20A
;Sets the current limit value to 20A in CV mode
INP
ON
;Turns on the load
4.14.5 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
1
2
3
4
5
6
7
Operation Descriptions
Display
Set the load to CCH mode, and set the current value to 2A.
0.000V 0.000A
2.000A CCH OFF
Press
Use
Load Default:
Yes *No
key to enter into the main menu.
key to select the menu item “Curr Rise Rate”; use Entry
keys or the knob together with
,
current value to 0.002A/us. Press
key to confirm.
Use
Curr Rise Rate:
0.002A/us
keys to input the
key to select the menu item “Curr Fall Rate”; use Entry
keys or the knob together with
,
current value to 0.005A/us. Press
key to confirm.
Curr Fall Rate:
0.005A/us
keys to input the
Press
key to exit the main menu.
0.000V 0.000A
2.000A CCH OFF
Press
key to turn on the load.
0.000V 0.000A
2.000A CCH ON
Press
key to turn off the load.
0.000V 0.000A
2.000A 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
61
CURR:RISE:RATE
0.002
CURR:FALL:RATE
0.005
INP
ON
INP
OFF
;Sets the current rise rate in CC mode to 0.002A/us
;Sets the current fall rate in CC mode to 0.005A/us
;Turns on the load
;Turns off the load
4.14.6 Trigger Function Selection
Example: Select “Tran” in trigger function selection (Trig Function).
Procedures
1
2
Operation Descriptions
Display
Load Default:
Yes *No
key to enter into the main menu.
Press
key to select the menu item “Trig Function”; use the
Use
key to select the parameter “Tran”. Press
knob or
Trig Function:
*Tran List
key
to confirm.
3
0.000V 0.000A
0.000A CCH OFF
key to exit the main menu.
Press
For the above operating procedures, the corresponding SCPI commands should be:
TRIG:FUNC
TRAN
;Selects transient operation (TRAN) for trigger function
4.14.7 Knob Function
Example: Enable the knob function.
Procedures
1
2
Operation Descriptions
Display
key to select the menu item “Knob”; use the knob or
Use
key to select the parameter “On”. Press
3
Load Default:
Yes *No
key to enter into the main menu.
Press
key to confirm.
0.000V 0.000A
0.000A CCH OFF
key to exit the main menu.
Press
Knob:
*On Off
4.14.8 Key Sound
Example: Enable the key sound.
Procedures
1
2
Operation Descriptions
Press
Use
or
Display
Load Default:
Yes *No
key to enter into the main menu.
key to select the menu item “Key Sound”; use the knob
key to select the parameter “On”. Press
Key Sound:
*On Off
key to
confirm.
3
Press
key to exit the main menu.
62
0.000V 0.000A
0.000A CCH OFF
4.14.9 Communication Interface
Example 1: 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
Step1
Step2
Operation Descriptions
Display
Load Default:
Yes *No
key to enter into the main menu.
Press
key to select the menu item “Interface”; use the knob or
Use
key to select the parameter “RS232”. Press
Interface:
*RS232 USB GPIB
key to
confirm.
Step3
key to select the menu item “Baud Rate”; use the knob
Use
,
or
Baud Rate:
*9600 19200
keys to select the parameter “9600”. Press
key to confirm.
Step4
key to select the menu item “Parity Check”; use the
Use
key to select the parameter “None”. Press
knob or
Parity Check:
*None Even Odd
key
to confirm.
Step5
key to select the menu item “Data Bit”; use the knob or
Use
key to select the parameter “8”. Press
Step6
key to select the parameter “2”. Press
Step7
key to confirm.
key to select the menu item “Stop Bit”; use the knob or
Use
Use
knob or
Data Bit:
*8 7
Stop Bit:
1 *2
key to confirm.
key to select the menu item “Flow Control”; use the
key to select the parameter “On”. Press
Flow Control:
*On
Off
key to
confirm.
Step8
Press
key to exit the main menu.
0.000V 0.000A
0.000A CCH OFF
Example 2: Select GPIB interface, set the address to 18.
Steps
Step1
Step2
Operation Descriptions
Press
Use
Display
key to enter into the main menu.
key to select the menu item “Interface”; use the knob or
63
Load Default:
Yes *No
Interface:
RS232 USB *GPIB
key to select the parameter “GPIB”. Press
key to
confirm.
Step3
Use
key to select the menu item “GPIB Address”; use Entry
keys or the knob together with
parameter “18”. Press
Step4
Press
,
GPIB Address:
18
keys to select the
key to confirm.
key to exit the main menu.
0.000V 0.000A
0.000A 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 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
64
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 annunciator on the front panel of the load. When the load receives the remote
command (SYSTem:REMote) via RS232 or GPIB interface, the REM annunnciator turns on. And the
load enters remote control status. In this status, all operations on the load are controlled by the remote
controller; the front panel keypad and knob has no effect (except
key +
key). 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. SYSTem:LOCal). Or you can return the load to local control
from remote control by pressing
key +
key.
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 command ( “MEAS:CURR?”) asks the load to return the
actual current at the Input binding posts. Please refer to “ARRAY 372x Series Electronic Load
SCPI Programming Guide” for detailed information on using query commands. 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
65
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 Examples
This example sets the current level to 0.5A, and then reads back the actual current value.
1 "INP 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 "INP ON"
;Turns on the load`s input
5 "MEAS:CURR?"
;Measures the actual input current
5.8 CV Mode Examples
This example presets the trigger voltage to 5V, and selects the external trigger source.
l "INP OFF"
;Turns off the load`s input
2 "MODE CV"
;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"INP 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.
5.9 CR Mode Examples
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. "INP OFF"
;Turns off the load`s input
2. "MODE CRM"
;Selects the CRM mode
3. "CURR:PROT 3"
;Sets the current protection limit to 3A
4. "CURR:PROT:DEL 10"
;Sets the current protection dealy time to 10 seconds
5. "CURR:PROT:STAT ON"
; Activates the current protection
6 "RES 10"
;Sets resistance level to 10Ω
7. "INP ON"
;Turns on the load`s input
8. "MEAS:POW?"
;Measures the input power level
5.10 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 "INP OFF"
;Turns off the load` s input
2 "MODE CV"
;Selects the CV mode
3 "VOLT:LOW 0.5"
;Sets the transient low level to 0.5V
4 "VOLT:HIGH 1"
;Sets the transient high level to 1V
5 "TRAN:LTIM 200us"
;Sets transient low level time to 200us
66
6 "TRAN:HTIM 300us"
7 "TRAN:RTIM 10us"
8 "TRAN:FTIM 20us"
9 "TRAN:MODE CONT "
10 "TRAN ON"
11 "INP ON"
;Sets transient high level time to 300us
;Sets the time for transient rising edge to 10us
;Sets the time for transient falling edge to 20us
;Selects the continuous transient operation
;Activates the transient operation
;Turns on the load` s input
5.11 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 "INP 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 LOW 0.5"
;Sets the transient low level to 0.5V
5 "VOLT:HIGH 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 "INP ON"
;Turns on the load` s input
12 "*TRG"
;*TRG command generates a 1millisecond high-level pulse at the
load`s input
Specifications
(The warm-up time is 30 minutes. Specifications indicate warranted performance in the
25°C ± 5°C region of the total temperature range.)
3720A
3721A
Model
Input Ratings
Current
0~30A
0~40A
Voltage
0~80V
0~80V
*1
250W at 40ºC
400W at 40ºC
Power
Input Characteristics
67
Input Characteristics
Minimum Operation Voltage
@ Full Scale Current
Constant Current Mode
0.6V
0.6V
Low Range
Resolution
Accuracy
0~3A
0.1mA
0.1%+5mA
0~4A
0.1mA
0.1%+5mA
High Range
Resolution
Accuracy
0~30A
1mA
0.1%+10mA
0~40A
1mA
0.1%+10mA
0~80V
1mV
0.1%+10mV
0~80V
1mV
0.1%+10mV
Low Range
Resolution
Accuracy @I>4A
0.02~2Ω
0.1mΩ
0.5%+12mΩ
0.02~2Ω
0.1mΩ
0.5%+12mΩ
Middle Range
Resolution
Accuracy @V>8V
2~200Ω
8.6uS*2
0.3%+1.25mS
2~200Ω
8.6uS
0.3%+1.25mS
High Range
Resolution
Accuracy @V>8V
20~2000Ω
0.96uS
0.3%+0.625mS
20~2000Ω
0.96uS
0.3%+0.625mS
Constant Power Mode
Range
Resolution @P<100W
@P≥100W
Accuracy
Current Measurement
0~250W
1mW
10mW
0.2%+600mW
0~400W
1mW
10mW
0.2%+600mW
Constant Voltage Mode
Range
Resolution
Accuracy
Constant Resistance Mode
68
Low Range
Resolution
Accuracy
0~3A
0.1mA
0.05%+4mA
0~4A
0.1mA
0.05%+4mA
High Range
Resolution
Accuracy
0~30A
1mA
0.05%+8mA
0~40A
1mA
0.05%+8mA
0~80V
1mV
0.1%+8mV
0~80V
1mV
0.1%+8mV
0~250W
1mW
10mW
0.1%+600mW
0~400W
1mW
10mW
0.1%+600mW
1mA/us~3A/us
100uA/us~300mA/us
1mA/us
1mA/us~4A/us
100uA/us~400mA/us
1mA/us
Voltage Measurement
Range
Resolution
Accuracy
Power Measurement
Range
Resolution @P<100W
@P≥100W
Accuracy
Current Slew Rates
Range CCH
CCL*3
Resolution
Accuracy *4
Transient Operation
Transient Mode
Frequency Range *5
3% + 10us
3% + 10us
Continuous, Pulse, Toggled
0.38Hz~50kHz
Continuous, Pulse, Toggled
0.38Hz~50kHz
High/Low Time
Resolution
Accuracy
0~655.35ms
10us
0.2%+10us
0~655.35ms
10us
0.2%+10us
10us~655.35ms
10us
0.2%+10us
10us~655.35ms
10us
0.2%+10us
10us~100000s
10us
0.2%+10us
10us~100000s
10us
0.2%+10us
1~50
1~65535
7 lists
Chain
1~50
1~65535
7 lists
Chain
Rising/Falling Time
Resolution
Accuracy
List Characteristics
Step Time
Resolution
Accuracy
Number of Steps
Cycle
Store Capacity
Expanded Functions
69
Battery Discharge
Discharge Time
Resolution
Accuracy
1s~100h
1s
0.2%+1s
1s~100h
1s
0.2%+1s
Battery Capacity
Resolution
Accuracy
1mAh~3000Ah
1mAh
0.3%+0.01Ah
1mAh~4000Ah
1mAh
0.3%+0.01Ah
3.3A
33A
0V
0.018Ω
1.8Ω
18Ω
270W
0W
4.4A
44A
0V
0.018Ω
1.8Ω
18Ω
420W
0W
3A/us
0.6V/us
≥20kΩ
4A/us
0.6V/us
≥20kΩ
TTL falling edge
≥10us
TTL falling edge
≥10us
33A
84V
OV, OC,OP, OT, RV
44A
84V
OV, OC,OP, OT, RV
25A
40A
30A
50A
3mA/30mA
5mV
3mA/30mA
5mV
0~50ºC
≤85%
RS232, GPIB, USB
SCPI
0~50ºC
≤85%
RS232, GPIB, USB
SCPI
Short Circuit
CCL Mode
CCH Mode
CV Mode
CRL Mode
CRM Mode
CRH Mode
CPV Mode
CPC Mode
Maximum Slew Rate
Current
Voltage
Programmable Open Circuit
Trigger Input
Trigger Level
Trigger Pulse Width
Maximum DC Input
Current
Voltage
Protection Features
Reverse Current Capacity
Input OFF
Input ON
Ripple and Noise
Current(rms/p-p)
Voltage(rms)
Environmental Conditions
Temperature
Relative Humidity
Remote Interface*6
Programming Language
AC Input
70
Voltage
Frequency
Net Weight
AC110V or AC220V±15%
48 to 63Hz
5.8kg
AC110V or AC220V±15%
48 to 63Hz
5.8kg
3722A
3723A
0~20A
0~200V
200W at 40ºC
0~30A
0~200V
350W at 40ºC
1.2V
1.2V
Low Range
Resolution
Accuracy
0~2A
0.1mA
0.1%+5mA
0~3A
0.1mA
0.1%+5mA
High Range
Resolution
Accuracy
0~20A
1mA
0.1%+10mA
0~30A
1mA
0.1%+10mA
0~200V
2mV
0.1%+25mV
0~200V
2mV
0.1%+25mV
0.0666~6.66Ω
0.1mΩ
0.5%+40mΩ
0.0666~6.66Ω
0.1mΩ
0.5%+40mΩ
6.66~666Ω
2.6uS
0.3%+375uS
6.66~666Ω
2.6uS
0.3%+375uS
Model
Input Ratings
Current
Voltage
Power*1
Input Characteristics
Input Characteristics
Minimum Operation Voltage
@ Full Scale Current
Constant Current Mode
Constant Voltage Mode
Range
Resolution
Accuracy
Constant Resistance Mode
Low Range
Resolution
Accuracy @I>3A
Middle Range
Resolution
Accuracy @V>20V
71
High Range
Resolution
Accuracy @V>20V
Constant Power Mode
Range
Resolution @P<100W
@P≥100W
Accuracy
Current Measurement
Low Range
Resolution
Accuracy
High Range
Resolution
Accuracy
Voltage Measurement
Range
Resolution
Accuracy
Power Measurement
Range
Resolution @P<100W
@P≥100W
Accuracy
Current Slew Rates
Range CCH
CCL*3
Resolution
66.6~6660Ω
0.29uS
0.3%+188uS
66.6~6660Ω
0.29uS
0.3%+188uS
0~200W
1mW
10mW
0.2%+600mW
0~350W
1mW
10mW
0.2%+600mW
0~2A
0.1mA
0.05%+4mA
0~3A
0.1mA
0.05%+4mA
0~20A
1mA
0.05%+8mA
0~30A
1mA
0.05%+8mA
0~200V
1mV
0.1%+50mV
0~200V
1mV
0.1%+50mV
0~200W
1mW
10mW
0.1%+600mW
0~350W
1mW
10mW
0.1%+600mW
1mA/us~2A/us
100uA/us~200mA/us
1mA/us
1mA/us~3A/us
100uA/us~300mA/us
1mA/us
Accuracy *4
Transient Operation
Transient Mode
Frequency Range *5
3% + 10us
3% + 10us
Continuous, Pulse, Toggled
0.38Hz~50kHz
Continuous, Pulse, Toggled
0.38Hz~50kHz
High/Low Time
Resolution
Accuracy
0~655.35ms
10us
0.2%+10us
0~655.35ms
10us
0.2%+10us
72
Rising/Falling Time
Resolution
Accuracy
10us~655.35ms
10us
0.2%+10us
10us~655.35ms
10us
0.2%+10us
10us~100000s
10us
0.2%+10us
10us~100000s
10us
0.2%+10us
1~50
1~65535
7 lists
Chain
1~50
1~65535
7 lists
Chain
Discharge Time
Resolution
Accuracy
1s~100h
1s
0.2%+1s
1s~100h
1s
0.2%+1s
Battery Capacity
Resolution
Accuracy
1mAh~2000Ah
1mAh
0.3%+0.01Ah
1mAh~3000Ah
1mAh
0.3%+0.01Ah
2.2A
22A
0V
0.06Ω
6Ω
60Ω
220W
0W
3.3A
33A
0V
0.06Ω
6Ω
60Ω
370W
0W
2A/us
0.6V/us
≥20kΩ
3A/us
0.6V/us
≥20kΩ
TTL falling edge
≥10us
TTL falling edge
≥10us
22A
210V
OV, OC,OP, OT, RV
33A
210V
OV, OC,OP, OT, RV
List Characteristics
Step Time
Resolution
Accuracy
Number of Steps
Cycle
Store Capacity
Expanded Functions
Battery Discharge
Short Circuit
CCL Mode
CCH Mode
CV Mode
CRL Mode
CRM Mode
CRH Mode
CPV Mode
CPC Mode
Maximum Slew Rate
Current
Voltage
Programmable Open Circuit
Trigger Input
Trigger Level
Trigger Pulse Width
Maximum DC Input
Current
Voltage
Protection Features
73
Reverse Current Capacity
Input OFF
Input ON
Ripple and Noise
Current(rms/p-p)
Voltage(rms)
Environmental Conditions
Temperature
Relative Humidity
Remote Interface*6
Programming Language
25A
35A
25A
40A
3mA/30mA
5mV
3mA/30mA
5mV
0~50ºC
≤85%
RS232, GPIB, USB
SCPI
0~50ºC
≤85%
RS232, GPIB, USB
SCPI
AC110V or AC220V±15%
48 to 63Hz
5.8kg
AC110V or AC220V±15%
48 to 63Hz
5.8kg
AC Input
Voltage
Frequency
Net Weight
*1. Maximum continuous power available is derated linearly from 100% of maximum at
40ºC, to 75% of maximum at 50 ºC.
*2. Conductance (S) = 1 / Resistance (Ω). The siemens is the SI derived unit of
conductance, and the symbol is "S".
*3. The set level is 10 times larger than the slew rate in CCL mode.
*4. The actual transition time is defined as the time required for the input to change from
10% to 90% or from 90% to 10% of the programmed excursion.
*5. Transient frequency depends on the time for high/low level and rising/falling edge.
*6. Full remote control via RS232 with optional GPIB and USB.
74
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertising