Model: 9120A, 9121A, 9122A, 9123A, 9124, 9150, 9151, 9152, 9153
Single Output Programmable DC Power
Supply
USER MANUAL
Safety information
Please review the following safety precautions before operating our equipment.
General information
The following safety precautions should be observed before using this product and any associated
instrumentations.
This product is intended for use by qualified personnel who recognize shock hazards and are familiar with the
safety precautions required to avoid possible injury. Read and follow all installation, operation, and maintenance
information carefully before using the product. Refer to this manual for complete product specifications.
If the product is used in a manner not specified, the protection provided by the product may be impaired.
Before performing any maintenance, disconnect the line cord and all test cables.
Protection from electric shock
Operators of this instrument must be protected from electric shock at all times. The responsible body must ensure
that operators are prevented access and/or insulated from every connection point. In some cases, connections
must be exposed to potential human contact.
Under these circumstances personnel must be trained to protect themselves from the risk of electric shock. If the
circuit is capable of operating at or above 1000 volts, no conductive part of the circuit may be exposed.
Definition of users
Responsible body is the individual or group responsible for the use and maintenance of equipment is operated
within its specifications and operating limits, and for ensuring that operators are adequately trained.
This product should only be used as intended. Users must be trained in electrical safety procedures and proper
use of the instrument. Users must be protected from electric shock and contact with hazardous live circuits.
Service is only to be performed by qualified service personnel.
Safety symbols and terms
Connect to safety earth ground using the wire recommended in the user manual.
This symbol on an instrument indicates that the user should refer to the operating instructions
located in the manual.
Certification
We certify that this product met its published specifications at time of shipment from the factory.
2
TABLE OF CONTENTS
1. Introduction............................................................................................................ 4
Description ............................................................................................................................................... 4
Features .................................................................................................................................................... 4
2. Quick Reference ..................................................................................................... 5
2.1 The Front Panel .......................................................................................................................................... 5
2.2 The Rear Panel ......................................................................................................................................... 6
2.3 Preliminary Checkout ................................................................................................................................. 7
1. Check the list of supplied items............................................................................................................ 7
2. Connect the power cord and turn on the power supply ........................................................................ 7
3. Checkout Procedure ............................................................................................................................. 7
1.4 Output Verification ..................................................................................................................................... 8
Voltage Output Check............................................................................................................................... 8
Current Output Check .............................................................................................................................. 9
1.5 If the power supply does not turn On ......................................................................................................... 9
1.5.1 Fuse Replacement............................................................................................................................ 9
1.6 Adjusting the Carrying Handle ................................................................................................................. 10
1.7 Rack Mounting the Instrument ................................................................................................................. 11
3. Front-panel Operation ........................................................................................ 12
3.1 Front Panel Keys ...................................................................................................................................... 12
Numerical Keys/Secondary Shift Functions........................................................................................... 13
Shift Functions ....................................................................................................................................... 13
Primary Function Keys ........................................................................................................................... 13
Up/Down and Entry key ......................................................................................................................... 13
3.2 Front-panel Operation Overview .............................................................................................................. 13
3.3 Setting the Voltage.................................................................................................................................... 13
3.4 Setting the Current.................................................................................................................................... 14
3.5 Save and Recall Operation ....................................................................................................................... 14
3.6 Menu Operation........................................................................................................................................ 14
3.7 Output Operation ...................................................................................................................................... 14
3.8 Remote Sense and digital port functions .................................................................................................. 14
3.9 Digital Volt Meter (DVM) ........................................................................................................................ 14
3.10 Milliohm Meter ...................................................................................................................................... 15
4. Remote Operation ................................................................................................ 16
4.1 Serial adapter connector ........................................................................................................................... 16
4.2 Communication between Power Supply and PC ...................................................................................... 17
4.3 SCPI Command Overview ....................................................................................................................... 19
Common IEEE488.2 Commands ........................................................................................................... 19
Essential SCPI Commands ..................................................................................................................... 19
Port Configuration Commands ............................................................................................................... 21
Trigger Command .................................................................................................................................. 21
SCPI Condition Register ........................................................................................................................ 21
4.4 SCPI Command Description .................................................................................................................... 23
Common IEEE488.2 Commands ........................................................................................................... 23
Essential SCPI Commands ..................................................................................................................... 25
Output Commands .................................................................................................................................. 28
List File Commands ............................................................................................................................... 29
Interface Configuration Commands ....................................................................................................... 33
Trigger commands .................................................................................................................................. 34
5. Specifications ........................................................................................................ 36
5.1 Specifications ........................................................................................................................................... 36
5.2 Supplemental Characteristics ................................................................................................................... 39
3
1. Introduction
Description
Models 9120A, 9121A, 9122A, 9123A, 9124, 9150, 9151, 9152, and 9153 are fully programmable, linear DC
Power Supplies that provide you with clean and reliable power, high resolution and accuracy combined with fast
transient response times and excellent temperature stability. The front panel keys and the control knob provide
a convenient interface for adjusting Voltage and Current, storing and recalling operating states or
enabling/disabling the output.
This power supply is suitable for either bench or rack mounted operation. The
912xA is a compact, laboratory grade power supply well suited for applications in design, production or use in
university labs.
Features
Very high accuracy and resolution: 0.1 mV, 0.1 mA
Low ripple and low noise
Fast settling time of }
:RANGe?
Trigger Command
TRIGger
[:IMMediate]
:SOURce {}
SCPI Condition Register
You can obtain the state of the power supply and read parameters from the operation register. The different states
of the power supply can be read from 7 condition registers. These registers are status byte register, standard event
register, quest condition register and operation status register. The status byte register stores the information of 3
other registers. The following table provides the details on each register’s meaning.
BIT
Signal
0
1
2
3
4
CAL
WTG
CV
CC
RI
0
1
2
OV
OT
UNR
0
2
3
OPC
QYE
DDE
Meaning
Operation status register
The power supply is calculating new calibration parameter.
The power supply is waiting for a trigger signal.
The power supply is in constant voltage condition.
The power supply is in constant current condition.
Show the input level condition of RI
Quest condition register
Over voltage
Over temperature
The output of the power supply is unregulated.
Standard event status register
Operation of power supply is completed.
Query error. Data of output array is missing.
Device-dependent error. Data stored in register is missing or error occurs in
21
4
5
EXE
CME
7
PON
3
5
6
QUES
ESB
MSS
RQS
OPER
7
preliminary checkout.
Execution error. Command parameter overflows or the condition is not right.
Command error. Syntax or semantic error occurs when receiving information.
Power on. It is 1when power supply is reset.
Status byte register
If a quest enable condition changes, QUES is 1.
If a standard event status enable register changes, ESB is 1.
If a operation event enable register changes, OPER is 1.
Structure of condition register:
Quest condition register
condition event enable
0
1
2
3
4
5
6
7
OV
OT
Unr
n.u.
n.u.
n.u
n.u
n.u
0
1
2
3
4
5
6
7
L
O
G
I
C
0
1
2
3
4
5
6
7
O
R
Operation event register
Status byte register
condition event enable
CAL
WTG
CV
CC
RI
n.u
n.u
n.u
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
Standard event status register
event enable
OPC
0
0
n.u
1
1
QYE
2
2
DDE
3
3
EXE
4
4
CME
5
5
n.u
6
6
PON
7
7
0
1
2
3
4
5
6
7
L
O
G
I
C
O
R
event
n.u 0
n.u
1
n.u
2
QUES 3
n.u
4
ESB
5
RQS
6
OPER 7
L
O
G
I
C
O
R
22
enable
0
1
2
3
4
5
6
7
L
O
G
I
C
O
R
4.4 SCPI Command Description
Common IEEE488.2 Commands
*CLS
This command clears the following registers:
Standard event status register
Quest condition register
Operation event register
Status byte register
Error code
Command syntax: *CLS
Parameter: None
*ESE
This command sets the parameter of the standard event enable register. The value determines which bit value of
the standard event register is set to 1. The ESB bit in of status byte register will change to 1 to reflect the
changes.
Command syntax: *ESE
Parameter: 0~255
Reset value: Consult *PSC command
Example: *ESE 128
Query syntax: *ESE?
Return parameter:
Reference command: *ESR? *PSC *STB?
Bit map of standard event status enable register
Bit position
7
6
Bit Name
PON Not used
Bit Weight
128
PON Power-on
CME Command error
EXE
Execution error
5
CME
32
4
EXE
16
DDE
QYE
OPC
3
2
1
DDE QYE Not used
8
4
Device-dependent error
Query error
Operation complete
0
OPC
*ESR?
This command queries the standard event status register. After executing this command, the standard event status
register is reset. The bit definition of the standard event status register is identical to the standard event status
enable register
Query syntax: *ESR?
Parameter: None
Return parameter:
Reference command: *CLS *ESE *ESE? *OPC
*IDN?
This command reads information about the power supply. The return value contains 4 segments divided by a
comma.
Query syntax: *IDN?
Parameter: None
Return parameter:
segment
description
23
BK Precision
XXXX
XXXXXX
manufacturer
product mode
product serial number
VX．XX
software version number
For example: BK PRECISION，9120A，000004，V1.01
*OPC
When all commands sent to the instrument prior to this command have been executed, OPC of the standard event
status register will be set to 1.
Command syntax: *OPC
Parameter: None
Query syntax: *OPC?
Return parameter:
*PSC
This command controls whether or not the power supply sends when it is reset.
1 OR ON: When power supply is reset, operation event enable register, query event enable register and
standard event status register are all reset.
0 OR OFF: The data of status byte register, operation event enable register, quest event enable register and
standard event status enable register is stored in nonvolatile register, and is recalled when
power supply is reset.
Command syntax: *PSC
Parameter: 0|1|ON|OFF
Query syntax: *PSC?
Return parameter: 0|1
Reference command: *ESE *SRE STAT:OPER:ENAB STAT:QUES:ENAB
*RST
This command resets the power supply to its default setting.
CAL:SEC:STAT OFF
OUTP OFF, CURR MAX
VOLT:PROT:MAX
VOLT: MIN
TRIG:SOUR BUS
SYST:SENS OFF
PORT:MODE TRIG
RI:MODE OFF
DFI:SOUR OFF
VOLT:PROT:STAT OFF
Command syntax: *RST
Parameter: None
*SRE
This command can set the parameter of the status byte enable register. The value of this parameter determines
which bit value of the status byte register is 1 and the byte will enable RQS of status byte register is 1. The bit
definition of the status byte enable register is the same as the status byte register.
Command syntax: *SRE
Parameter: 0~255
Reset value: Consult *PSC command
Example: *SRE 128
Query syntax: *SRE?
24
Return parameter:
Reference Command: *ESE *ESR?
*PSC *STB?
*STB?
This command reads data from the status byte register. After executing this command, the status byte register is
reset.
Query syntax: *STB?
Parameter: None
Return parameter:
Reference command: *CLS
*ESE *ESR
Bit map of the standard event status enable register
Bit Position
Bit Name
Bit Value
7
OPER
128
6
RQS
64
5
ESB
32
4
no use
3
QUES
8
2
no use
1
no use
0
no use
*TRG
When the power supply’s trigger source is set to Bus command, this command will generate a trigger signal. Its
function is identical to the [SYSTem:]TRIGger command.
Command syntax: *TRG
Parameter: None
Reference command: TRIG TRIG:SOUR
*SAV
This command saves the operating parameters of the power supply to non volatile memory. The parameters
include constant current, constant voltage, maximum voltage value and step voltage values.
Command syntax: *SAV
Parameter: 1~50
Example: *SAV 3
Reference command: *RCL
*RCL
This command recalls the parameter saved with the *SAV command.
Command syntax: *RCL
Parameter: 1~50
Example: *RCL 3
Reference command: *SAV
Essential SCPI Commands
SYSTem:ERRor[:NEXT]?
This command queries the error code and error information of the power supply.
(0)
No error
(1)
Too many numeric suffices in Command Spec
(10)
No Input Command to parse
(14)
Numeric suffix is invalid value
(16)
Invalid value in numeric or channel list, e.g. out of range
(17)
Invalid number of dimensions in a channel list
(20)
Parameter of type Numeric Value overflowed its storage
(30)
Wrong units for parameter
(40)
Wrong type of parameter(s)
25
(50)
(60)
(65)
(70)
(80)
(90)
(101)
(100)
(110)
1.
2.
3.
4.
Wrong number of parameters
Unmatched quotation mark (single/double) in parameters
Unmatched bracket
Command keywords were not recognized
No entry in list to retrieve (number list or channel list)
Too many dimensions in entry to be returned in parameters
Command Execution error
Too many command
Rxd error Parity
Error EEPROM
Config data error
Error Calibration data
Factory Data error
Command syntax: SYST:ERR?
Parameter: None
Return parameter: ,
SYSTem:VERSion?
This command queries the software version.
Command syntax: SYST:VERS?
Parameter: None
Return parameter:
SYSTem:ADDRess?
This command queries the address of the power supply
Command syntax: SYST:ADDR?
Parameter: None
Return parameter:
SYSTem:REMote
This command puts the power supply in remote control mode.
Command syntax: SYST:REM
Parameter: None
Query syntax: None
SYSTem:LOCal
This command configures the instrument for front panel operation
Command syntax: SYST:LOC
Parameter: None
Query syntax: None
SYSTem:RWLock[:STATe]
This command also sets the instrument to remote control mode. When using this command, it is not possible to
press LOCAL key on the front panel to revert back to manual mode.
Command syntax: SYST:RWL
STATus:QUEStionable[:EVENt]?
This command queries the parameters of the quest event register. After execution, the quest event register is
reset.
Query syntax: STATus:QUEStionable[:EVENt]?
Parameter: None
Return parameter:
Reference command: STATus:QUEStionable:ENABle
26
Bit map of standard event status enable register
Bit Position
Bit name
Bit Value
7
no use
6
no use
5
no use
4
no use
3
no use
2
unr
4
1
OT
2
0
OV
1
STATus:QUEStionable:CONDition?
This command queries the parameters of the quest condition register. When a bit of the quest condition changes,
the corresponding bit value in the quest event register will be set to 1.
Query syntax：STATus:QUEStionable: CONDition?
Parameter：None
Return parameter：
STATus:QUEStionable:ENABle
This command sets the parameter of the quest event enable register. This parameter determines which bit of the
quest event register is set to 1. If a QUES condition changes, the QUES bit of status byte register will be set to
1.
Command syntax: STATus:QUEStionable:ENABle
Parameter: 0~255
Reset value: Consult *PSC command
Example: STATus:QUEStionable:ENABle 128
Query syntax: STATus:QUEStionable:ENABle?
Return parameter:
Reference command: *PSC
STATus:OPERation[:EVENt]?
This command queries the parameters of the operation event register. After executing this command the
operation event register is reset.
Query syntax: STATus: OPERation [:EVENt]?
Parameter: None
Return parameter:
Reference command: STATus: OPERation:ENABle
Bit map of standard event status enable register
Bit Position
Bit Name
Bit value
7
no use
6
no use
5
no use
4
RI
16
3
CC
8
2
CV
4
1
WTG
2
0
CAL
1
STATus:OPERation:CONDition?
This command queries the parameters of the operation condition. When a parameter of the operation condition
register changes, the corresponding bit in the operation event register will be set to 1.
Query syntax: STATus: OPERation: CONDition?
Parameter: None
Return parameter:
STATus:OPERation:ENABle
This command sets the parameter of the operation event enable register. The parameter determines which bit
value of quest event register is set to 1. If a OPER condition changes, the OPER bit of the status byte register
27
will be set to 1.
Command syntax: STATus: OPERation:ENABle
Parameter: 0~255
Reset value: Consult *PSC command
Example: STATus: OPERation:ENABle 128
Query syntax: STATus: OPERation:ENABle?
Return parameter:
Reference command: *PSC
Output Commands
OUTPut[:STATe]
This command sets the power supply output on or off.
Command syntax: OUTPut[:STATe]
Parameter: 0|1|ON|OFF
*RST value: OFF
Query syntax: OUTPut:STATe?
Return parameter: 0|1
Usage:
If output timer is required, send command OUTPUT:TIMER ON first, then set OUTPUT ON. These two
commands must be set in this order to function properly.
OUTPut:TIMer[:STATe]
This command sets the output timer state of the power supply.
Command syntax: OUTPut:TIMer[:STATe]
Parameter: 0|1|ON|OFF
*RST value: OFF
Query syntax: OUTPut:TIMer[:STATe]?
Return parameter: 0|1
Usage:
To start Timer
- First, set OUTPUT:TIMER ON, then set OUTPUT ON.
To end Timer
- Set OUTPUT:TIMER OFF to turn timer off.
To check timer status
- Send command OUTPUT:TIMER?
OUTPut:TIMer:DATA
This command sets the time of the output timer. The unit is in SECOND and decimal fractions cannot be
used for this command.
Command syntax: ONPut:TIMer:DATA
Parameter:
*RST value: 1
Query syntax: OUPut:TIMer:DATA?
Return parameter:
[SOURce:]MODE
This command configures the power supply for command fixed mode, list mode or DVM mode.
FIXed
Command fixed mode
LIST
List mode
DRM
Digital milliohm meter
Command syntax: [SOURce:]MODE
28
Parameter: FIXed|LIST|DRM
*RST value: FIXed
Example: MODE FIX
Query syntax: [SOURce:] MODE？
Return parameter:
Usage:
MODE FIX command can also be used to stop a list execution.
[SOURce:]CURRent [:LEVel]
This command sets the current value of the power supply.
Command syntax: [SOURce:]CURRent [:LEVel]
Parameter: MIN TO MAX|MIN|MAX
Unit: A mA
*RST value: MIN
Example:
Query syntax:
Parameter:
Example:
Return parameter:
CURR 3A， CURR 30mA， CURR MAX，
[SOURce:]CURRent [:LEVel]?
[MIN|MAX]
CURR? , CURR? MAX, CURR? MIN
CURR MIN
[SOURce:]VOLTage[:LEVel]
This command sets the voltage value of the power supply.
Command syntax: [SOURce:]VOLTage[:LEVel]
Parameter: MIN TO MAX|MIN|MAX
Unit: V mV kV
*RST value: MAX
Query syntax: [SOURce:]VOLTage[:LEVel]?
Parameter: [MIN|MAX]
Return parameter:
List File Commands
List file operations can be executed using standard SCPI commands. The commands must be executed in a
certain order to successfully complete a list file.
Below is an example that demonstrates how to set a list in continuous mode with correct command order.
LIST:MODE CONT
LIST:STEP ONCE
LIST:COUNT 2
LIST:VOLT 1,2
LIST:VOLT 2,4
LIST:UNIT SECOND
LIST:WID 1,1
LIST:WID 2,2
LIST:NAME ‘TEST’
LIST:SAVE 1
MODE LIST
Note: Be sure to specify LIST:AREA prior to using a set of list commands similar to above.
For details on setting values for each commands, refer to the descriptions below.
[SOURce:]LIST:MODE
29
This command sets the trigger condition for executing the list file
CONTinious
List operation is continuous mode.
STEP
List operation is step mode.
Command syntax: [SOURce:]LIST:MODE
Parameter: CONTinious|STEP
Query syntax: [SOURce:]LIST:MODE?
Return parameter:
[SOURce:]LIST:STEP
This command sets the operation mode of the list file.
ONCE
List operate once
REPeat Repeat list operation
Command syntax: [SOURce:]LIST:STEP
Parameter: ONCE|REPeat
Query syntax: [SOURce:]LIST:STEP?
Return parameter:
Note to usage:
When setting to LIST:STEP REPEAT, the list would run repeatedly for an indefinite amount of time.
Below is an example set of commands to setup a repeated list properly:
*IDN?
PORT:FUNCTION TRIGGER
OUTPUT:TIMER OFF
OUPUT OFF
LIST AREA 4
LIST:COUNT 2
LIST:UNIT SECOND
TRIGGER:SOURCE BUS
LIST:VOLTAGE 1,5
LIST:VOLTAGE 2,1
LIST:WIDTH 1,4
LIST:WIDTH 2,2
LIST:MODE CONT
LIST:STEP REPEAT
LIST:NAME ‘MX’
LIST:SAVE 1
MODE LIST
OUTPUT ON
TRIGGER
[SOURce:]LIST:COUNt
This command sets the number of steps for the list operation.
Command syntax: [SOURce:]LIST:COUNt
Parameter: 2~400
Query syntax: [SOURce:]LIST:COUNt?
Parameter: None
Return parameter:
[SOURce:]LIST :CURRent[:LEVel]
This command sets the current step.
Command syntax: [SOURce:]LIST:CURRent[:LEVel]
Parameter: 0~30A
30
Unit:
Example:
Query syntax:
Parameter:
Example:
Return parameter:
A mA
LIST:CURR 1,3A;
[SOURce:]LIST:CURRent:[LEVel]?
None
LIST:CURR? 1;
[SOURce:]LIST :VOLTage[:LEVel]
This command sets the voltage step.
Command syntax: [SOURce:]LIST:VOLTage [:LEVel]
Parameter: 0~360V
Unit: V mV
Example: LIST:VOLT 1,3V;
Query syntax: [SOURce:]TRANsition: VOLTage:TLEVel?
Parameter: None
Example: LIST:VOLT? ;
Return parameter:
[SOURce:]LIST:WIDth
This command sets the minimum step time.
Decimal fractions are not allowed for this command. Units are in
seconds or milliseconds, which are set using LIST:UNIT command (see LIST:UNIT).
Set units first before
using this command.
Command syntax: [SOURce:]LIST:WIDth
Parameter: MIN TO MAX|MIN|MAX
Unit: S mS
Example: LIST:WID 1, 100;
Query syntax: [SOURce:]LIST:WIDth?
Parameter: None
Example: LIST:WID? 1;
Return parameter:
[SOURce:]LIST:NAME
This command sets the name for the list file. Make sure the file name does not exceed 8 characters.
Command syntax: [SOURce:]LIST:NAME
Parameter:
Example: LIST:NAME ‘TEST’;
Query syntax: [SOURce:]LIST:NAME?
Return parameter:
[SOURce:]LIST:AREA
This command divides up the storage area for the list file in one of the 4 ways listed below.
1．1 group per store area, 400 steps
2．2 groups per storage area, each group contains 200 steps.
4．4 groups per storage area, each group has 100 steps.
8．8 groups of storage area, each group has 50 steps.
Command syntax: [SOURce:]LIST:AREA
Parameter: 1|2|4|8
Example: LIST:AREA 1
Query syntax: [SOURce:]LIST:AREA?
Return parameter:
[SOURce:]LIST:SAVe
31
This command saves the list file to a register (non volatile memory).
approximately 0.1 million times.
The memory can be written
Command syntx：[SOURce:]LIST:SAVe
Parameter: 1~8
Example: LIST:SAV 1
[SOURce:]LIST:RCL
This command can recall the list file saved before from the register.
Command syntax: [SOURce:]LIST:SAV
Parameter: 1~8
Example: LIST:SAV 1
[SOURce:]LIST:UNIT
This command sets the unit for the list width in either seconds (SECOND) or milliseconds (MSECOND).
Command syntax: [SOURce:]LIST:UNIT
Parameter: SECOND or MSECOND
Example: LIST:UNIT SECOND
Measurement commands
Note: All measurement commands have units in Volts (V), Ampere (A), or Watts (W).
allowed.
MEASure[:SCALar]:VOLTage[:DC]?
This command queries the input voltage of the power supply.
Command syntax: MEASure[:SCALar]:VOLTage[:DC]?
Parameter: None
Return parameter:
Return parameter unit: V
Example: MEAS:VOLT?
MEASure[:SCALar]:CURRent[:DC]?
This command queries the input current of the power supply.
Command syntax: MEASure[:SCALar]:CURRent[:DC]?
Parameter: None
Return parameter:
Return parameter unit: A
Example: MEAS:CURR?
MEASure[:SCALar]:POWer[:DC]?
This command queries the input power of the power supply.
Command syntax: MEASure[:SCALar]:POWer?
Parameter: None
Return parameter:
Return parameter unit: W
Example: MEAS:POW?
MEASure[:SCALar]:DVM[:DC]?
This command queries the voltage reading of the digital volt meter.
Command syntax: MEASure[:SCALar]:DVM?
Parameter: None
Return parameter:
Return parameter unit: V
Example: MEAS:DVM?
32
Decimal fractions are
SENSe:RESistance:RANGe
This command sets the range of the milliohm meter.
LOW: 0.01W resistance range
MIDDLE: 0.1W resistance range
HIGH: 1W resistance range
Command syntax: SENSe:RESistance:RANGe
Parameter: LOW | MIDdle | HIGH
Example: RES:RANG LOW
Query syntax: SENSe:RESistance:RANGe?
Return parameter:
MEASure[:SCALar]:RESistance[:DC]?
This command queries the resistance reading of the milliohm meter.
Command syntax: MEASure[:SCALar]: RESistance?
Parameter: None
Return parameter:
Return parameter unit: Ohm
Example: MEAS:RES?
Interface Configuration Commands
[SOURce:]SYSTem:SENSe [:STATe]{}
This command enables/disables the power supply’s remote sense function.
Command syntax: SYSTem: SENSe [:STATe]
Parameter: 0|1|ON|OFF
Query syntax: SYSTem:SENSe [:STATe]?
*RST value: 0
[SOURce:]PORT:FUNCtion
This command sets the mode of the port in the rear panel.
TRIGGER function:
Pin1, pin2 are configured as external trigger source for the power supply and to
control the list operation.
RI/DFI function:
Inhibit Input controls the output state of the power supply. The Fault Output can
indicate the reason for internal failure.
DIGITAL I/O function: Read and control the state of the digital port
Command syntax: SOURce:PORT:FUNCtion
Parameter: TRIGger|RIDFi|DIGital
Query syntax: SOURce:PORT:FUNCtion?
*RST value: TRIGger
[SOURce:]RI:MODE
This command sets the input mode of the RI input pin
Command syntax: SOURce:RI:MODE
Parameter: OFF|LATChing|LIVE
Query syntax: SOURce:RI:MODE?
*RST value: OFF
[SOURce:]DFI:SOURce
This command sets output source of the DFI output pin.
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(Not available for models 9150, 9151, 9152, and 9153)
Command syntax: SOURce:DFI:SOURce
Parameter: OFF|QUES|OPER|ESB|RQS
Query syntax: SOURce:DFI:SOURce?
*RST value: OFF
[SOURce:]DIGital:OUTPut[:STATe]
This command sets the output state of the digital port. This command can be used when the mode of the port is
set to DIGITAL. (Not available for models 9150, 9151, 9152, and 9153)
Command syntax: SOURce:OUTPut[:STATe]
Paremeter: OFF|ON|0|1
[SOURce:]DIGital:INPut[:STATe]?
This command sets the input state of port. This command can be used when the mode of the port is set to
DIGITAL.
Command syntax:
SOURce:DIG:INPut[:STATe] ?
Trigger commands
TRIGger[:IMMediate]
When trigger source is command mode, this command will give a trigger signal. Its function is as the same as
*TRG command.
Order syntax: * TRIGger[:IMMediate]
Parameter: None
Reference order: TRIG
TRIG:SOUR
TRIGger:SOURce
This command sets the trigger mode of the power supply.
IMMediate:
When this function is enabled, you can generate an immediate trigger pulse by pressing
Shift
plus
Trigger.
EXTernal trigger signal (TTL):
When this function is enabled, the power supply can be triggered with a TTL pulse applied to pin 1 of
the terminal connector in the rear. The TTL on pulse width should be at least 5 ms.
BUS Command
When this function is enabled, you can trigger the power supply by sending a *TRG or TRIgger
command to the power supply
Command syntax: TRIGger:SOURce
Parameter: IMMediate|EXTernal|BUS
*RST value: KEY
Note on usage:
When using the trigger command to initiate a list, commands have to be set in a particular order in order to
complete the trigger.
Example:
Below shows how to initiate a list in continuous mode using trigger under bus command mode:
*IDN?
PORT:FUNCTION TRIGGER
TRIGGER:SOURCE BUS
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LIST:MODE CONT
LIST:STEP ONCE
LIST:COUNT 2
LIST:VOLT 1,2
LIST:VOLT 2,4
LIST:UNIT SECOND
LIST:WID 1,1
LIST:WID 2,2
LIST:NAME ‘TEST’
LIST:SAVE 1
MODE LIST
TRIGGER
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5. Specifications
5.1 Specifications
Models 9120A, 9121A and 9124
Parameter
Voltage
Output Ratings
Current
( 0 °C~40 °C)
LVP*
9120A
0 - 32 V
0-3A
0 - 33 V
9121A
0 - 20 V
0-5A
0 - 21 V
9124
0 - 72 V
0 - 1.2 A
0 - 73 V
Load Regulation
Voltage
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