B&K Precision 9120A, 9121A, 9122A, 9123A, 9124, 9150, 9151, 9152, 9153 User manual

Model: 9120A, 9121A, 9122A, 9123A, 9124, 9150, 9151, 9152, 9153

Single Output Programmable DC Power
Supply

USER MANUAL

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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.

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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

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1. Introduction

2

1

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 <150 μs

 5

 Convenient data entry via knob or numerical key pad

 Over Temperature (OTP) protection

 Bright and easy to read display (VFD technology)

 Excellent temperature stability

 Output on/off control

 SCPI compatible command set. Communicate via USB or GPIB (model 9123A only) interface

 Application Software for front panel emulation and simple test sequence generation

 Rack mount kit available

 Closed case calibration

 Remote Sense Function

 Discrete Fault Indicator/Remote Inhibit (DFI/RI). Can be used to turn off power supplies simultaneously.

 List Mode: Generate, store and execute test sequences without the need for an external computer

digit digital voltage meter and mΩ meter

(DFI available for models 9120A, 9121A, 9122A, 9123A, 9124 only)

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2. Quick Reference

2

3

4

5

7

1

2

5

1

VFD display

2

Rotary knob

3

Power switch

4

Numeric keys, auxiliary. functions

8

2.1 The Front Panel

For Models: 9120A, 9121A, 9122A, 9123A, 9124

For Models: 9150, 9151, 9152, 9153

1

6

3 4

6 7

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5

Function keys

6

Up/Down keys and “Enter” key

7

Output terminals

Digital Voltmeter terminals (For Model 9150, 9151, 9152,

9153)

2.2 The Rear Panel

1

2

3

4

5

6

2

3

5

4

8

For Models: 9120A, 9121A, 9122A, 9123A, 9124

For Models: 9150, 9151, 9152, 9153

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7

1

Digital Voltmeter terminals. (For models 9150, 9151, 9152, and
9153, these terminals are in the front panel)

2

AC power inlet and fuse compartment

3

Ventilation holes

4

Quick connect terminal for Remote sensing and digital port
functions (digital I/O, DFI/RI and ext. trigger)

5

TTL interface connector for remote control

6

AC Power selection switch (110 V / 220 V)

System Test, Please wait!

0.000V 0.0000A

0.000V 0.000V

2.3 Preliminary Checkout

The following steps help you verify that the power supply is ready for use.

1. Check the list of supplied items

Verify that you have received the following items with your power supply. If anything is missing, contact your

authorized B&K Precision distributor.

- Power cord

- Instruction manual

- Calibration Report

- Communication cable(s)

- Software Installation disk

2. Connect the power cord and turn on the power supply

When you turn on the power supply, the front-panel display will light up briefly while the power supply performs

its power-on self-test. All the VFD annunciators will turn on at once. Check for any missing display segments.

Refer to section 1.5 in this chapter if the power supply does not turn on.

3. Checkout Procedure

At power up, the instrument will automatically perform a self test routine. During this time, the following

should be displayed:

followed by

The first row displays the actual output voltage value and current and the state of power supply. The second row

displays the voltage measured by the DVM (on left) and the Set Value for the voltage of the power supply.

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ERR EEPROM

ERROR CAL

Error Config Data

Out on/off

Sourc: XXV XA Meas: XXV
Ver: 1.67 SN:5975002002

To obtain additional information about the instrument, press and hold the SHIFT button during Power Up. On

the display you will see the following:

First row: V/A rating and DVM voltage range

second row: Firmware version and serial number

Press “Esc” to exit the display.

In case the self test routine is not successful, you may see one of the following:

If the EEPROM was damaged or the latest operation data is lost, the VFD will display:

If the calibration data stored in the EEPROM is lost, the VFD will display

If the latest operating state of the power supply in EEPROM is lost, the VFD will display:

Warning: The power supply is shipped from the factory with a power-line cord that has a plug

appropriate for your location. Your power supply is equipped with a 3-wire grounding type power cord; the

third conductor being the ground. The power supply is grounded only when the power-line cord is plugged

into an appropriate receptacle. Do not operate your power supply without adequate cabinet ground

connection.

1.4 Output Verification

The following procedures verify that the power supply outputs the correct voltage and current levels and properly

responds to entries from the front panel.

Voltage Output Check

The following steps verify basic voltage functions without load.

1) Turn on the power supply.

2) Enable the outputs

Press the key. Notice the CV annunciator turning on.

3) Set the voltage value

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Set a different voltage value. Make sure that the set value and output value are the same. Also check if the

Model

Fuse Description (110 VAC)

Fuse Description (220 VAC)

9120A

T2.5A 250V

T1.25A 250V

9121A

T2.5A 250V

T1.25A 250V

9124

T2.5A 250V

T1.25A 250V

9122A

T3.15A 250V

T1.5A 250V

9123A

T3.15A 250V

T1.5A 250V

9150

T10A 250V

T5A 250V

9151

T10A 250V

T5A 250V

9152

T10A 250V

T5A 250V

9153

T10A 250V

T5A 250V

Out on/off

output current value is zero or close to zero A.

4) Ensure that the voltage can be adjusted from zero to the maximum rated value.

Current Output Check

The following steps check the basic current functionality by shorting the power supply’s output.

1) Turn on the power supply.

2) Disable the output by pressing the . The ON annunciator is turned off.

3) Connect a short across the (+) and (-) output terminals with an insulated test lead. Use a wire size

sufficient to handle the maximum current.

4) Enable the output.

5) Adjust the voltage value to 1.0 volt. Ensure that the CC annunciator is lit (power supply is in CC

operation mode)

6) Adjust the current value. Set a different Current value and check if the actual Current value is the same

as the set Current value. Also verify that the output voltage value is nearly zero.

7) Ensure that the current can be adjusted from zero to the full rated value.

8) Turn off the power supply and remove the short wire from the output terminals.

1.5 If the power supply does not turn On

Use the following steps to help resolve problems you might encounter when turning on the instrument.

1. Verify that there is AC power applied to the power supply.

Verify that the power cord is firmly plugged into the power receptacle on the rear panel of the power supply.

Make sure the power outlet you are using is working properly and verify that the power supply is turned on.

2. Verify the power-line voltage setting.

Make sure the voltage selector switch is set according to the present line voltage (110 VAC or 220 VAC).

Change the voltage setting if it’s not correct.

3. Verify that the correct power-line fuse is installed.

1.5.1 Fuse Replacement

Replace blown fuses according to the table above.

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1.6 Adjusting the Carrying Handle

To adjust the position, grasp the handle by the sides and pull outward. Then rotate the handle to the desired

position.

Dimensions:

214.5 mm (W) x 88.2 mm (H) x 354.6 mm (D) all units in mm

For Models: 9120A, 9121A, 9122A, 9123A, 9124

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For Models: 9150, 9151, 9152, 9153

1.7 Rack Mounting the Instrument

You can mount the power supply in a standard 19-inch rack cabinet using the IT-E151 rack mount kit.

Note: Remove the carrying handle and the two plastic ears before rack-mounting the instrument. To

remove the handle, grasp the handle on the side, pull outwards and rotate it to a special position
where the arrow on the handle and the arrow on the plastic ears are in opposite directions. Now you
can pull the handle outwards. After removing the handle, you can remove the two plastic ears with a
screw driver.

To rack mount a single instrument, order rack mount kit IT-E151

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To rack mount two instruments (models 9120A, 9121A, 9122A, 9123A, 9124 only) side-by-side,
order rack mount kit IT-E151, In this case you don’t need to use the front cover panel.

3. Front-panel Operation

So far we have covered the quick start chapter which briefly introduced the front panel operation and how to

check basic voltage and current functionality. This chapter describes in detail how to operate the instrument

manually via the front-panel keys.

This chapter is divided into the following sections:

 Front-Panel Operation Overview
 Setting the Voltage
 Setting the Current
 Save/Recall Operation
 Menu Operation
 On/Off Operation
 Remote Sense and digital port functions
 mΩ Meter
 Digital Voltage Meter

3.1 Front Panel Keys

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Numerical Keys/Secondary Shift Functions

V-setV-set

Enter

9

0

Out on/off

Shift Functions

V/mΩ: Toggle between DVM and mΩ Meter mode

0.1 W: Set the range of the mΩ Meter to 0.1 W

1 W: Set the range of the mΩ Meter to 1 W

10 W: Set the range of the mΩ Meter to 10 W

Menu Set the parameters of the power Supply

List Generate programs in List Mode

Trigger Generate a single trigger pulse (when configured for Immediate mode)

Local Enable front panel operation when in remote mode

0 – 9 Numerical keys for direct entry of values

Primary Function Keys
Up/Down and Entry key

▲：Up key

▼：Down key

Enter: Press to confirm numerical entries

3.2 Front-panel Operation Overview

1) The power supply at shipment is preconfigured for front-panel operation. At power-on, the power supply

will automatically start up in front panel operation mode.

2) When the power supply is in remote operation mode, the front-panel is disabled. You can revert to Local

mode, by pressing the Local button or by sending the appropriate SCPI command. Toggling between

front-panel and remote operation modes will not result in any change of the output parameters.

3) The output of the power supply can be enabled or disabled from the front panel by pressing

the key. When the output is on, the CV or CC annunciator will turn on.

4) The VFD annunciators display the present operating status of the power supply. At power up, the following

is displayed: The top row shows the actual output voltage and output current value and the state of the

power supply. The second line shows the voltage value as measured by the DVM and the Set value of the

Voltage. The bottom right field is also used to display the Current Set Value, the Menu parameters and the

Ohm meter range.

3.3 Setting the Voltage

The Voltage can be adjusted from 0V to the maximum rated voltage of each model. There are 2 ways to set the

constant voltage value.

Solution1：

Press the ▲ and ▼ keys or the knob to change the value of the least significant digit

Solution2:

1. Press

2. Use the numeric keys to and confirm your entry by pressing

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Save

ENTER

ENTER

On/Off

I-Set

Enter

+

_

DVM

DUT

3.4 Setting the Current

The Current output is adjustable from 0A to the maximum current value of each model.

1. Press

2. Enter a numerical value or use the ▲and ▼keys to change the current value

3. Press to confirm the value

3.5 Save and Recall Operation

You can store up to 50 different operating states in memory locations 1 through 50. Each operating state

includes a constant voltage value, constant current value, maximum output voltage value and voltage step value.

To save a setting:

Set the desired Voltage and Current value

Press the save

to assign and store the current settings to the selected memory location

To recall a setting:

Press the Recall key. Use the knob to scroll to the memory location where the settings you want to recall are

stored. Press

You can also use the SCPI command:*SAV *RCL to save and recall respectively.

key. Use the knob to scroll to one of the memory locations 1 – 50. Press

to recall and activate those settings

3.6 Menu Operation

3.7 Output Operation

For front panel operation, press

control mode, you can send SCPI command (OUTPut ON|OFF) to change the state of output.

to enable/disable the output. If the power supply is in remote

3.8 Remote Sense and digital port functions

3.9 Digital Volt Meter (DVM)

The power supply provides a built-in Digital Volt meter which can measure DC volts in a range from 0 - 40V.

The connectors are in the rear panel. The voltage value is displayed on the bottom left field of the display.

To measure voltages, connect the leads as shown here:

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Shift

NOTE: The DVM integrated inside these power supplies is an added feature for the convenience of

monitoring voltages of a setup being powered by the same power supply with the DVM. It is not meant to
be used as a standalone measuring unit. Due to the input of the DVM being partially integrated to the
internal circuitry of the power supply, and the DVM not having a floating reference, there are limitations
on the applications it can be used for. For example, it cannot be used to measure negative voltages (only
positive voltage, 0-40VDC), it cannot measure a dry cell battery, and it cannot measure a voltage source
with isolated GND.

Shift

Shift

+

_

DV M

_

POWER SUPPLY

Load

By default, the power supply is in DVM mode. Press
and mΩ Meter mode.

followed by V/mΩ to toggle between Voltmeter

3.10 Milliohm Meter

The instrument is also equipped with a Milliohm Meter which can accurately measure resistance up to 10 Ω.

To protect the resistor, make sure to select an appropriate power range before connecting it to the power supply.

To measure resistance, connect the resistor as shown below:

To measure resistance:

1) Enable Ohmmeter mode: Press

2) Press

measuring.

followed by 0.1 W /1 W /10 W to select an appropriate range for the resistor you are

followed by V/mΩ（Display will show ---.—mΩ Range 0.1 W）

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Measurement range

0.1 W

1 W

10 W

Test voltage (Output)

1 V

3.3 V

10 V

IT-E132B communication

4. Remote Operation

The DB9 TTL interface connector on the rear panel of the power supply can be connected to a USB (virtual com)

or GPIB (model 9123A only) interface via a serial converter cable. This chapter describes how to use a computer

to control the output of the power supply.

4.1 Serial adapter connector

Note: It is not possible to connect the DB9 TTL connector on the power supply’s rear panel
supply via a standard RS232 cable to a PC’s RS232 port.

USB to TTL serial Converter cable IT-E132B

The DB9 interface connector on the rear panel of the power supply provides a TTL level interface. Use the

communication cable (IT-E132B) to connect the DB9 interface connector of the power supply to the USB

interface connector of the computer.

Note: Before you can use the USB communication cable, you must install the USB driver which

can be found on the included installation disk. The driver can also be downloaded at

www.bkprecision.com

GPIB to TTL adapter IT-E135 (Model 9123A only)

The DB9 interface connector on the rear panel of the power supply provides a TTL voltage level interface. Use

the communication adapter IT-E135 to communicate via GPIB

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PC

Connect this
side to your
computer’s
GPIB
interface
(GPIB cable
not included)

Power Supply

Connect this
connector to
DB9 TTL
connector of
power supply
(serial cable
included)

Connect external
AC power
adapter
(included)

Recommended power up sequence:

Connect the IT-E135 adapter to your computer and to the power supply as indicated in the above figure. Connect
the external power adapter. Both TX and RX LED should be lit (provided the power supply is turned off)
Turn on power supply. The TX and RX LEDs will turn off
For maximum throughput, set the baudrate to 38400. Set parity to NONE (default setting). Set address to the
desired GPIB instrument address.

Note: The RX LED and TX LEDs will flicker to indicate activity on the GPIB bus. The RX LED indicates a
write command (from controller’s perspective), the TX LED will indicate data transmission from power supply
to GPIB controller.

4.2 Communication between Power Supply and PC

Before putting the instrument into remote operation, make sure that the baud rate, parity bit and communication

address settings on the power supply and computer side are identical, otherwise communication will not be

possible.

1． Address Range is 0 to 30. Default setting is 0.
2． Baud rate: 4800,9600,19200 and 38400 are selectable, default setting is 9600
3． Parity and Data bits： None/8 bits (default setting)

Even/8 bits
Odd/8 bits

4． Stop bits：1 (fixed)
5． Start Bits: 1 (fixed)

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Data Frame Format

Parity=None

Start

Bit

8 Data Bits

Stop

Bit

Parity=Odd,

Even

Start

Bit

8 Data Bits

Parity

Bit

Stop

Bit

End of String character is ’\n’ (0x0a)

DB9 Interface Details

The DB9 connector in the rear panel of the power supply provides a TTL level signal .It can be connected to a

standard PC interface via the IT-E132B isolated converter/adapter.

Flow Control

There are no hardware flow controls for sending and receiving commands to the power supply.
The average time it takes to both send and receive every command is approximately 200ms. In
the case of more complex commands, more time may be required to complete transmission.

Note: Configuration of address parameter

Communication via USB (virtual com): Setting of the address is optional. It is not required to

communicate with the instrument. The address can be set from the front panel and is stored in non

volatile memory. This feature is useful when communicating via USB, and connecting several

instruments, e.g. via a USB hub. In this scenario, Windows assigns a virtual COM port to each

device which is unknown prior to establishing communications with the instrument (could be

different each time). In this case, the user can correlate each virtual COM port randomly assigned

by Windows with a user defined address.

Communication via GPIB: Setting of the address value is mandatory and corresponds to GPIB

instrument address according to GPIB/IEEE-488 conventions. Valid values are 0 – 30.

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4.3 SCPI Command Overview

Common IEEE488.2 Commands

*CLS
*ESE
*ESE?
*ESR?
*IDN?
*OPC
*OPC?
*PSC

*PSC？
*RST

*SRE
*SRE?
*STB?
*TRG
*SAV
*RCL

Essential SCPI Commands

SYSTem

:ERRor[:NEXT]?
:VERSion?,
:ADDRess?
:REMote
:LOCal

:RWLock

STATus

:QUEStionable

[:EVENt]?
:CONDition?
:ENABle <VALUE>
:ENABle?

:OPERation

:[EVENt]?
: CONDition?
:ENABle <VALUE>

:ENABle?

Calibration Command

CALibration

:SECure

[:STATe] {<ON|OFF>,<quoted code>}
[:STATe]?

:VOLTage

:LEVel {<level> }
[:DATA] {<numeric value>}

:CURRent

:LEVel {<level> }

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[:DATA] {<numeric value>}
:DVM
:LEVel {<level>}
[:DATA] {<numeric value>}

:SAVe
:INITital

Output Commands

OUTPut

[:STATe] {<bool>}
[:STATe]?
:TIMer

[:STATe] {<bool>}

[:STATe]?

:DATA {<timer>}

:DATA?
[SOURce:]

MODE {<FIXed|LIST|DRM>}
MODE?
VOLTage

[:LEVel] {<n>}

[:LEVel]?

:PROTection

:STATe {<bool>}

:STATe?

[:LEVel] {<n>}
[:LEVel]?

CURRent

[:LEVel] {<n>}

[:LEVel]?

LIST

:MODE {<mode>}

:MODE?

:STEP {<step>}

:STEP?

:COUNt {<n>}

:COUNt?

:CURRent

[:LEVel] {<n>,<n>}
[:LEVel]? {<n>}

:VOLTage

[:LEVel] {<n>,<n>}

[:LEVel]? {<n>}
:WIDth {<n>,<n>}
:WIDth? {<n>}
:NAME {<string code>}
:NAME?
:AREA {1|2|4|8}
:AREA?
:SAVe {1|2|3|4|5|6|7|8}
:RCL {1|2|3|4|5|6|7|8}
:UNIT {SECOND, MSECOND}

Input Measure Command
MEASure

[:SCALar]

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:VOLTage[:DC]?

BIT

Signal

Meaning

0
1
2
3
4

CAL

WTG

CV
CC

RI

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

0
1
2

OV

OT

UNR

Quest condition register
Over voltage
Over temperature
The output of the power supply is unregulated.

0
2
3

OPC
QYE
DDE

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

:CURRent[:DC]?
:POWer[:DC]?

:DVM[:DC]？

:RESistance[DC]?

Port Configuration Commands

[SOURce:]

SYSTem
: SENSe [:STATe] {<bool>}

[:STATe]?
PORT
:FUNCtion {<TRIGger|RIDFi|DIGital>}
: FUNCtion?
RI
:MODE {<OFF|LATChing|LIVE>}
:MODE?
DFI
:SOURce {<OFF|QUES|OPER|ESB|RQS>}
:SOURce?
DIGital
:OUTPut[:STATe] {<bool>}
:INPut[:STATe]?
SENSe

:RESistance:

:RANGe {LOW | MIDdle | HIGH>}

:RANGe?

Trigger Command

TRIGger

[:IMMediate]
:SOURce {<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.

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4
5

7

EXE

CME

PON

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.

3
5
6

7

QUES

ESB

MSS

RQS

OPER

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.

0

1

2

3

4

5

6

7

0

1

2

3

4

5

6

7

L
O
G
I
C

O
R

0

1

2

3

4

5

6

7

0

1

2

3

4

5

6

7

0

1

2

3

4

5

6

7

L
O
G
I
C

O
R

0

1

2

3

4

5

6

0

1

2

3

4

5

6

L
O
G
I
C

O
R

0

1

2

3

4

5

6
7

0

1

2

3

4

5

6

7

0

1

2

3

4

5

6

7

L
O
G
I
C

O
R

Structure of condition register:

Quest condition register
condition event enable

OV

OT

Unr

n.u.

n.u.

n.u

n.u

n.u

Operation event register Status byte register

condition event enable event enable

CAL n.u

WTG n.u

CV n.u

CC QUES

RI n.u

n.u ESB

n.u RQS

n.u OPER

Standard event status register
event enable

OPC

n.u

QYE

DDE
EXE

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CME
n.u
PON

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4.4 SCPI Command Description

Bit position

7 6 5 4 3 2 1

0

Bit Name

PON

Not used

CME

EXE

DDE

QYE

Not used

OPC

Bit Weight

128 32

16 8 4

PON Power-on
CME Command error
EXE Execution error

DDE Device-dependent error
QYE Query error
OPC Operation complete

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 <NRf>

Parameter: 0~255

Reset value: Consult *PSC command

Example: *ESE 128

Query syntax: *ESE?

Return parameter: <NR1>

Reference command: *ESR? *PSC *STB?

Bit map of standard event status enable register

*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: <NR1>

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: <AARD> segment description

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BK Precision manufacturer
XXXX product mode

XXXXXX 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: <NR1>

*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 <bool>

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 <NRf>

Parameter: 0~255

Reset value: Consult *PSC command

Example: *SRE 128

Query syntax: *SRE?

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Return parameter: <NR1>

Bit Position

7 6 5 4 3 2 1

0

Bit Name

OPER

RQS

ESB

no use

QUES

no use

no use

no use

Bit Value

128

64

32 8

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: <NR1>

Reference command: *CLS *ESE *ESR

Bit map of the standard event status enable register

*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<NRf>

Parameter: 1~50

Example: *SAV 3

Reference command: *RCL

*RCL

This command recalls the parameter saved with the *SAV command.

Command syntax: *RCL<NRf>

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)

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(50) Wrong number of parameters
(60) Unmatched quotation mark (single/double) in parameters
(65) Unmatched bracket
(70) Command keywords were not recognized
(80) No entry in list to retrieve (number list or channel list)
(90) Too many dimensions in entry to be returned in parameters
(101) Command Execution error
(100) Too many command
(110) Rxd error Parity

1. Error EEPROM

2. Config data error

3. Error Calibration data

4. Factory Data error

Command syntax: SYST:ERR?

Parameter: None

Return parameter: <NR1>, <SRD>

SYSTem:VERSion?

This command queries the software version.

Command syntax: SYST:VERS?

Parameter: None

Return parameter: <NR2>

SYSTem:ADDRess?

This command queries the address of the power supply

Command syntax: SYST:ADDR?

Parameter: None

Return parameter: <NR2>

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: <NR1>

Reference command: STATus:QUEStionable:ENABle

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Bit Position

7 6 5 4 3 2 1 0 Bit name

no use

no use

no use

no use

no use

unr

OT

OV

Bit Value

4 2

1

Bit Position

7 6 5 4 3 2 1

0

Bit Name

no use

no use

no use

RI

CC

CV

WTG

CAL

Bit value

16 8 4 2 1

Bit map of standard event status enable register

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：<NR1>

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 <NRf>

Parameter: 0~255

Reset value: Consult *PSC command

Example: STATus:QUEStionable:ENABle 128

Query syntax: STATus:QUEStionable:ENABle?

Return parameter: <NR1>

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: <NR1>

Reference command: STATus: OPERation:ENABle

Bit map of standard event status enable register

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: <NR1>

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

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will be set to 1.

Command syntax: STATus: OPERation:ENABle <NRf>

Parameter: 0~255

Reset value: Consult *PSC command

Example: STATus: OPERation:ENABle 128

Query syntax: STATus: OPERation:ENABle?

Return parameter: <NR1>

Reference command: *PSC

Output Commands

OUTPut[:STATe]

This command sets the power supply output on or off.

Command syntax: OUTPut[:STATe] <bool>

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] <bool>

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 <NR1>

Parameter: <NR1>
*RST value: 1
Query syntax: OUPut:TIMer:DATA?

Return parameter: <NR1>

[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 <mode>

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Parameter: FIXed|LIST|DRM

*RST value: FIXed

Example: MODE FIX

Query syntax: [SOURce:] MODE？

Return parameter: <CRD>

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] <NRf>

Parameter: MIN TO MAX|MIN|MAX

Unit: A mA

*RST value: MIN

Example: CURR 3A， CURR 30mA， CURR MAX， CURR MIN

Query syntax: [SOURce:]CURRent [:LEVel]?

Parameter: [MIN|MAX]

Example: CURR? , CURR? MAX, CURR? MIN

Return parameter: <NR2>

[SOURce:]VOLTage[:LEVel]

This command sets the voltage value of the power supply.

Command syntax: [SOURce:]VOLTage[:LEVel] <NRf>

Parameter: MIN TO MAX|MIN|MAX

Unit: V mV kV

*RST value: MAX

Query syntax: [SOURce:]VOLTage[:LEVel]?

Parameter: [MIN|MAX]

Return parameter: <NR2>

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

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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 <CRD>

Parameter: CONTinious|STEP

Query syntax: [SOURce:]LIST:MODE?

Return parameter: <CRD>

[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 <SRD>

Parameter: ONCE|REPeat
Query syntax: [SOURce:]LIST:STEP?

Return parameter: <CRD>

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 <NRf>

Parameter: 2~400

Query syntax: [SOURce:]LIST:COUNt?

Parameter: None

Return parameter: <NR1>

[SOURce:]LIST :CURRent[:LEVel]

This command sets the current step.

Command syntax: [SOURce:]LIST:CURRent[:LEVel]

Parameter: 0~30A

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Unit: A mA

Example: LIST:CURR 1,3A;

Query syntax: [SOURce:]LIST:CURRent:[LEVel]?

Parameter: None

Example: LIST:CURR? 1;

Return parameter: <NR2>

[SOURce:]LIST :VOLTage[:LEVel]

This command sets the voltage step.

Command syntax: [SOURce:]LIST:VOLTage [:LEVel] <NRf>

Parameter: 0~360V

Unit: V mV

Example: LIST:VOLT 1,3V;

Query syntax: [SOURce:]TRANsition: VOLTage:TLEVel?

Parameter: None

Example: LIST:VOLT? ;

Return parameter: <NR2>

[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 <NR1>

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: <NR1>

[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 <name>

Parameter: <SRD>

Example: LIST:NAME ‘TEST’;

Query syntax: [SOURce:]LIST:NAME?

Return parameter: <SRD>

[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 <NR1>

Parameter: 1|2|4|8

Example: LIST:AREA 1

Query syntax: [SOURce:]LIST:AREA?

Return parameter: <NR1>

[SOURce:]LIST:SAVe

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This command saves the list file to a register (non volatile memory). The memory can be written
approximately 0.1 million times.

Command syntx：[SOURce:]LIST:SAVe <NR1>

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 <NR1>

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 <second>

Parameter: SECOND or MSECOND

Example: LIST:UNIT SECOND

Measurement commands
Note: All measurement commands have units in Volts (V), Ampere (A), or Watts (W). Decimal fractions are
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: <NR2>

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: <NR2>

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: <NR2>

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: <NR2>

Return parameter unit: V

Example: MEAS:DVM?

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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: <SRD>

MEASure[:SCALar]:RESistance[:DC]?

This command queries the resistance reading of the milliohm meter.

Command syntax: MEASure[:SCALar]: RESistance?

Parameter: None

Return parameter: <NR2>

Return parameter unit: Ohm

Example: MEAS:RES?

Interface Configuration Commands

[SOURce:]SYSTem:SENSe [:STATe]{<bool>}

This command enables/disables the power supply’s remote sense function.

Command syntax: SYSTem: SENSe [:STATe] <bool>

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. (Not available for models 9150, 9151, 9152, and 9153)

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Command syntax: SOURce:DFI:SOURce

Shift

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

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 <mode>

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

plus

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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

Parameter

9120A

9121A

9124

Output Ratings

( 0 °C~40 °C)

Voltage

0 - 32 V

0 - 20 V

0 - 72 V

Current

0 - 3 A

0 - 5 A

0 - 1.2 A

LVP*

0 - 33 V

0 - 21 V

0 - 73 V

Load Regulation

(％of output+offset)

Voltage

<0.01％+2 mV¹

<0.01％+2 mV¹

Current

<0.05％+2 mA

<0.05％+3 mA

Line Regulation

(％of output+offset)

Voltage

<0.01％+1 mV¹

<0.01％+1 mV¹

Current

<0.05％+0.1 mA

≤0.05％+0.05 mA

Programming resolution

Voltage

0.5 mV

2 mV

Current

0.1 mA

0.02 mA

Readback/Meter

resolution

Voltage

0.1 mV

0.1 mV

0.5 mV

Current

0.01 mA

0.05 mA

0.01 mA

Front Panel setting

resolution

Voltage

0.5 mV

2 mV

Current

0.1 mA

0.02 mA

Programming accuracy,

12 months (25 °C ± 5 °C)

(％of output+offset)

Voltage

<0.03%+3 mV

≤0.03％+6 mV

Current

<0.05%+2 mA

≤0.05％+1 mA

Readback / Meter accuracy

12months (25 °C ± 5 °C)

(％of output+offset)

Voltage

<0.02%+3 mV

≤0.02％+5 mV

Current

<0.05%+2 mA

≤0.05％+1 mA

Ripple & Noise

(20 Hz ~20 MHz)

Voltage

≤ 4 mV

p-p

≤ 3 mV

p-p

≤ 5 mV

p-p

Current

≤ 3 mArms

≤ 3 mArms

≤ 3 mArms

Temperature coefficient,

(0 °C~40 °C)

(％of output+offset)

Voltage

<0.02%+3 mV

≤0.02%+5 mV

Current

<0.05％+2 mA

<0.05％+0.5 mA

Readback temperature,

coefficient,

(％of output+offset)

Voltage

<0.02%+3 mV

≤0.02%+5 mV

Current

<0.05％+2 mA

≤0.05％+0.5 mA

Transient response

μs

< 150 μs for output to recover to within 75 mV following a

change from 100 mA to 1 A

DVM Accuracy

Voltage

0 - 12 V range: 0.02%+2 mV
0 - 40 V range: 0.02%+3 mV

DVM Resolution

Voltage

0 - 12 V range: 0.1 mV

0 - 40 V range: 1 mV

Ohm meter

mΩ

Accuracy: 0.6%, for Voltage and Current > 11% of FS (full

scale)

Accuracy: 1.8% for Voltage and Current = 4 to 11% of FS

Weight

net

19.8 lbs, (9 kg)

Dimensions

WxHxD

214.5 mm × 88.2 mm × 354.6 mm

8.45(W) x 3.47(H) x 13.9(D) inch

5.1 Specifications

Models 9120A, 9121A and 9124

* = LVP: Limit Voltage Protection. Limits the voltage than can be set either via the front panel or remote control command.

¹ = While using Remote Sense

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Models 9122A, 9123A

Parameter

9122A

9123A

Output Ratings

( 0 °C~40 °C)

Voltage

0 - 60 V

0 - 30 V

Current

0 - 2.5 A

0 - 5 A

LVP*

0 - 61 V

0 - 31 V

Load Regulation

(％of output+offset)

Voltage

<0.01％+2 mV¹

Current

<0.05％+2 mA

<0.05％+3 mA

Line Regulation

(％of output+offset)

Voltage

<0.01％+2 mV¹

<0.01％+1 mV¹

Current

<0.05％+0.05 mA

<0.05％+0.1 mA

Programming resolution

Voltage

1 mV

0.5 mV

Current

0.1 mA

Readback/Meter

resolution

Voltage

0.5 mV

0.1 mV

Current

0.05 mA

Front Panel setting

resolution

Voltage

1 mV

0.5 mV

Current

0.1 mA

Programming accuracy,

12 months (25 °C ± 5 °C)

(％of output+offset)

Voltage

<0.03%+6 mV

<0.03%+3 mV

Current

<0.05%+1.5 mA

<0.05%+2.5 mA

Readback / Meter accuracy

12months (25 °C ± 5 °C)

(％of output+offset)

Voltage

<0.02%+6 mV

<0.02%+2.5 mV

Current

<0.05%+1.5 mA

<0.05%+2.5 mA

Ripple & Noise

(20 Hz ~20 MHz)

Voltage

≤ 5 mV

p-p

≤ 4 mV

p-p

Current

≤ 3 mA rms

≤ 4 mA rms

Temperature coefficient,

(0 °C~40 °C)

(％of output+offset)

Voltage

<0.02%+6 mV

<0.02%+3 mV

Current

<0.05％+1 mA

<0.05％+2 mA

Readback temperature,

coefficient,

(％of output+offset)

Voltage

<0.02%+6 mV

<0.02%+3 mV

Current

<0.05％+1 mA

<0.05％+2 mA

Transient response

μs

< 150 μs for output to recover to within 75 mV following a

change from 100 mA to 1 A

DVM Accuracy

Voltage

0 - 12 V range: 0.02%+2 mV
0 - 40 V range: 0.02%+3 mV

DVM Resolution

Voltage

0 - 12 V range: 0.1 mV

0 - 40 V range: 1 mV

Ohm meter

mΩ

Accuracy: 0.6%, for Voltage and Current > 11% of FS (full

scale)

Accuracy: 1.8% for Voltage and Current = 4% to 11% of FS

Weight

net

21.2 lbs, (9.6 kg)

Dimensions

WxHxD

214.5 mm × 88.2 mm × 354.6 mm

8.45(W) x 3.47(H) x 13.9(D) inch

* = LVP: Limit Voltage Protection. Limits the voltage than can be set either via the front panel or remote control command.

¹ = While using Remote Sense

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information.

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Models 9150, 9151, 9152, 9153

Parameter

9150

9151

9152

9153

Output Ratings
( 0 °C - 40 °C)

Voltage

0 - 5.2 V

0 - 20 V

0 - 30 V

0 - 60 V

Current

0 - 60 A

0 - 27 A

0 - 18 A

0 - 9 A

LVP*

0 - 5.5 V

0 - 21 V

0 - 31 V

0 - 61 V

Load Regulation

(%of output+offset)

Voltage

<0.01% + 2 mV

<0.01% + 1 mV

<0.01% + 1 mV

Current

<0.1% + 10 mA

<0.1% + 5 mA

<0.1% + 2 mA

Line Regulation

(%of output+offset)

Voltage

<0.02% + 0.1 mV

<0.02% + 1 mV

<0.02% + 1 mV

Current

<0.1% + 1 mA

<0.01% + 1 mA

<0.01% + 0.1 mA

Programming resolution

Voltage

0.1 mV

1 mV

1 mV

Current

1 mA

1 mA

0.1 mA

Readback/Meter

resolution

Voltage

0.1 mV

0.1 mV

0.1 mV

Current

1 mA

0.1 mA

0.1 mA

Front Panel setting

resolution

Voltage

0.1 mV

0.5 mV

0.5 mV

Current

1 mA

1 mA

1 mA

Programming accuracy,

12 months (25 °C ± 5 °C)

(%of output+offset)

Voltage

<0.02%+2 mV

<0.02%+6 mV

<0.02%+12 mV

Current

<0.1%+30 mA

<0.1%+15 mA

<0.05%+10 mA

Readback / Meter

accuracy

12months (25 °C ± 5 °C)

(%of output+offset)

Voltage

<0.02%+1.5 mV

<0.02%+3 mV

<0.02%+6 mV

Current

<0.05%+15 mA

<0.05%+10 mA

<0.05%+5 mA

Ripple & Noise

(20 Hz ~20 MHz)

Voltage

≤0.005%+3

mVp-p

≤0.005%+3 mVp-p

≤0.005%+4

mVp-p

Current

15 mArms

5 mArms

3 mArms

Temperature coefficient,

(0 °C~40 °C)

(%of output+offset)

Voltage

<0.02%+2 mV

<0.02%+5 mV

<0.02%+10 mV

Current

<0.1％+30 mA

<0.1％+15 mA

<0.05％+5 mA

Readback temperature,

coefficient,

(%of output+offset)

Voltage

<0.02%+2 mV

<0.02%+5 mV

<0.02%+10 mV

Current

<0.1％+20 mA

≤0.05%+10 mA

≤0.05%+5 mA

DVM Accuracy

Voltage

0~12 V range: 0.02%+2 mV
0~40 V range: 0.02%+3 mV

DVM Resolution

Voltage

0~12 V range: 0.1 mV

0~40 V range: 1 mV

Ohm meter

mΩ

Accuracy: 0.6%, for Voltage and Current > 11% of FS (full

scale)

Accuracy: 1.8% for Voltage and Current = 4% to 11% of FS

Weight

net

63.9 lbs (29 kg)

Dimensions

WxHxD

429 mm × 88.2 mm × 458.9 mm

16.88(W) x 3.47(H) x 18.06(D) inch

*) LVP: Limit Voltage Protection. Limits the voltage than can be set either via the front panel or remote control command.

NOTE: Specifications and information are subject to change without notice. Please visit for the most current product
information.

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39

9120A

9121A

9124

9122A

9123A

9150

9151

9152

9153

96 W

100 W

86 W

150 W

150 W

312 W

540 W

540 W

540 W

5.2 Supplemental Characteristics

State Storage Memory

50 user-configurable stored states

Recommended Calibration Interval

1 year

AC Input Ratings (selectable via switch on the rear panel)

220 AV±10%，47～63 Hz

110 AV±10%，47～63 Hz

Maximum output power

Cooling

Fan cooled

Operating Temperature

0 to 40 °C

Storage Temperature

-20 to 70 °C.

Environmental Conditions

Designed for indoor use in an installation category II, pollution degree 2 environments. Designed to operate at

maximum relative humidity of 95% and at altitudes of up to 2000 meters.

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SERVICE INFORMATION

Warranty Service: Please go the support and service section on our website to obtain a RMA #. Return the product in the original

packaging with proof of purchase to the address below. Clearly state on the RMA the performance problem and return any leads,
probes, connectors and accessories that you are using with the device.

Non-Warranty Service: Please go the support and service section on our website to obtain a RMA #. Return the product in the
original packaging to the address below. Clearly state on the RMA the performance problem and return any leads, probes,
connectors and accessories that you are using with the device. Customers not on an open account must include payment in the form
of a money order or credit card. For the most current repair charges please refer to the service and support section on our website.

Return all merchandise to B&K Precision Corp. with pre-paid shipping. The flat-rate repair charge for Non-Warranty Service does
not include return shipping. Return shipping to locations in North America is included for Warranty Service. For overnight
shipments and non-North American shipping fees please contact B&K Precision Corp.

Include with the returned instrument your complete return shipping address, contact name, phone number and

description of problem.

LIMITED THREE-YEAR WARRANTY

B&K Precision Corp. warrants to the original purchaser that its products and the component parts thereof, will be free from defects
in workmanship and materials for a period of three years from date of purchase.

B&K Precision Corp. will, without charge, repair or replace, at its option, defective product or component parts. Returned product
must be accompanied by proof of the purchase date in the form of a sales receipt.

To help us better serve you, please complete the warranty registration for your new instrument via our
website www.bkprecision.com

Exclusions: This warranty does not apply in the event of misuse or abuse of the product or as a result of
unauthorized alterations or repairs. The warranty is void if the serial number is altered, defaced or removed.

B&K Precision Corp. shall not be liable for any consequential damages, including without limitation damages resulting from loss of
use. Some states do not allow limitations of incidental or consequential damages. So the above limitation or exclusion may not
apply to you.

This warranty gives you specific rights and you may have other rights, which vary from state-to-state.

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