BK PRECISION 9120 A, 9121 A, 9124 Single output programmable DC power supply Instruction Manual

Below you will find brief information for Single output programmable DC power supply 9120A, Single output programmable DC power supply 9121A, Single output programmable DC power supply 9124. These models provide you with clean and reliable power with high resolution and accuracy combined with fast transient response times and excellent temperature stability. They feature a convenient interface for adjusting voltage and current values, storing and recalling operating states or enabling/disabling the output. They are suitable for bench or rack mounted operation. The highly compact 912x series is a laboratory grade power supply well suited for applications in design, production or use in university labs.

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INSTRUCTION

MANUAL

Models 9120A, 9121A, 9124

SINGLE OUTPUT PROGRAMMABLE

DC POWER SUPPLY SERIES

99 Washington Street

Melrose, MA 02176

Phone 781-665-1400

Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

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

C

onnect 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.

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................................................................................................................................. 6

1. Check the list of supplied items............................................................................................................ 6

2. Connect the power cord and turn on the power supply ........................................................................ 7

3. Checkout Procedure ............................................................................................................................. 7

1.4 Output Verification ..................................................................................................................................... 8

Current Output Check .............................................................................................................................. 8

1.5 If the power supply does not turn On ......................................................................................................... 8

1.6 To Adjust the Carrying Handle................................................................................................................... 9

1.7 To Rack Mount the Instrument................................................................................................................... 9

3. Front-panel Operation............................................................................................ 11

3.1 Front Panel Keys ...................................................................................................................................... 11

Numerical Keys/Secondary Shift Functions........................................................................................... 11

Shift Functions ....................................................................................................................................... 11

Primary Function Keys........................................................................................................................... 12

Up/Down and Entry key......................................................................................................................... 12

3.2 Front-panel Operation Overview.............................................................................................................. 12

3.3 Setting the Voltage.................................................................................................................................... 12

3.4 Setting the Current.................................................................................................................................... 13

3.5 Save and Recall Operation ....................................................................................................................... 13

3.6 Menu Operation........................................................................................................................................ 13

3.6.1 Menu Description .......................................................................................................................... 13

3.6.2 Menu Function .............................................................................................................................. 15

3.7 Output Operation...................................................................................................................................... 20

3.8 Remote Sense and digital port functions .................................................................................................. 20

3.9 Digital Volt Meter (DVM)........................................................................................................................ 21

3.10 Milliohm Meter ...................................................................................................................................... 22

4. Remote Operation .................................................................................................. 23

4.1 Communication cable............................................................................................................................... 23

4.2 Communication between Power Supply and PC...................................................................................... 24

4.3 SCPI Command Overview ....................................................................................................................... 24

Common IEEE488.2 Commands ........................................................................................................... 24

Essential SCPI Commands ..................................................................................................................... 25

Port Configuration Command ................................................................................................................ 27

Trigger Commands ................................................................................................................................. 27

SCPI Condition Register ........................................................................................................................ 27

4.4 SCPI Command Description .................................................................................................................... 29

Common IEEE488.2 Commands ........................................................................................................... 29

Essential SCPI Commands ..................................................................................................................... 32

Output Commands.................................................................................................................................. 35

List File Commands ............................................................................................................................... 36

Measurement commands ........................................................................................................................ 38

Interface Configuration Commands ....................................................................................................... 40

Trigger commands.................................................................................................................................. 41

Calibration commands............................................................................................................................ 41

5 Specifications.......................................................................................................... 43

5.1 Specifications ........................................................................................................................................... 43

5.2 Supplemental Characteristics ................................................................................................................... 44

1. Introduction

Description

Models 9120A, 9121A and 9124 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 912x 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: 0.1mV, 0.1mA

Low ripple and low noise

Fast settling time ﹤20ms

digit digital voltage meter and m

Ω

meter

Convenient data entry via knob or numerical key pad

Over Temperature (OTP) protection

Compact foot print ( 2U x 1/2)

Bright and easy to read display (VFD technology)

Excellent temperature stability

Output on/off control

SCPI compatible command set, communicate via USB or RS232 port

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

2. Quick Reference

2.1 The Front Panel

1 2

3 4 5 6 7

VFD display

Rotary knob

Power switch

Numeric keys, auxiliary. functions

Function keys

Up/Down keys and “Enter” key

Output terminals

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

2.2 The Rear Panel

1 2

3 4 5 6

Digital Voltmeter terminals

AC power inlet and fuse compartment

Ventilation holes

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

Interface connector for remote control

2.3 Preliminary Checkout

AC Power selection switch (110V / 220V)

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.

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:

System Test, Please wait! followed by

0.000V 0.00000A

0.000V 0.000V

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.

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

Sourc: XXV XA Meas: XXV

Ver: 1.67 SN:5975002002

Press “Esc” to exit, VFD displays as follows:

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 in lost, the VFD will display:

ERR EEPROM

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

ERROR CAL

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

Error Config Data

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

）Set the voltage value

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

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 that he 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.

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

To rack mount two instruments side-by-side, order rack mount kit IT-E151, In this case you don’t need to use the front cover panel.

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 (110VAC or 220VAC).

Change the voltage setting if it’s not correct.

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

Model

Fuse Description(110VAC

）

Fuse Description

（220VAC）

9120A

9121A

T2.5A 250V

9124 T2.5A 250V

Replace blown fuses according to the table above.

1.6 Adjusting the Carrying Handle

T1.25A 250V

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

Bench-top viewing positions Carrying position

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.

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

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: z Front-Panel Operation Overview z Setting the Voltage z Setting the Current z Save/Recall Operation z Menu Operation z On/Off Operation z Remote Sense and digital port functions z m

Ω

Meter z Digital Voltage Meter

3.1 Front Panel Keys

V-set I-set

Trigger

Save Recall Enter

V/m

Ω

0.1W

8 9

Local

10W

··

Shift On/Off

Numerical keys

Secondary Shift Functions

Numerical Keys/Secondary Shift Functions

Primary Function keys

Shift Functions

V/mΩ: Toggle between DVM and m

Ω

Meter mode

0.1W: Set the range of the m

Ω

Meter to 0.1W

1W: Set the range of the m

10W: Set the range of the m

Ω

Meter to 1W

Ω

Meter to 10W

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

V-set

Set the voltage value

I-set

Save

Recall

Set the current value

Save the current operating data to internal memory

Recall operating data from internal memory

On/Off

Set the output state of the power supply

Shift

Use to access secondary functions

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

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

Enter

3.4 Setting the Current

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

2. Enter a numerical value or use the

▲ and

▼ keys to change the current 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

Save

key. Use the knob to scroll to one of the memory locations 1 – 50. Press to assign and store the current settings to the selected memory location

To recall a setting:

ENTER

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

ENTER

to recall and activate those settings

You can also use the SCPI command:*SAV

、*RCL to save and recall.

3.6 Menu Operation

3.6.1 Menu Description

Press Shift :Menu to enter menu mode. The menu parameters will be displayed in the bottom right field of the display. Use the

▲

and ▼ keys to scroll through the menu list and press

ENTER

to select a menu and view the parameters. Press

ESC

to return to the higher level menu and to return to the main operating mode.

Config

Config Init.

Out Recall

Off<Default>

PWR-ON Recall

Off<Default>

Key Sound Set

Return to the factory default setup value.

Set the Power ON/OFF state after power up.

“Remembers” and restores the Power ON/OFF state of the power supply before power was turned off.

Disable this function.

Recall operating parameters of power supply after power up

“Remembers” and restores the operating parameters of the power supply (voltage, current settings..) before power was turned off.

Disable this function.

Keypad sound setting.

Off

Knob Lock Set

Off< Default >

Remote Sense

Disable key sound

Enable/disable the rotary knob.

Lock the rotary knob.

Unlock the rotary knob.

Setup voltage measurement Mode.

Off< Default >

ShortCut Recall

The power supply will measure the input voltage at the remote sense connector.

The power supply will measure the input voltage at the front panel connector.

Shortcut of the recall function

Off<Default>

Meter Rate Set

Disable this function

Set the update speed of the power supply meter

Low< Default >

Baudrate set

Low speed

Set the baud rate

Baudrate 4800 < Default

Baudrate 9600

Baudrate 19200

Baudrate 38400

Comm. Parity Configure the parity bit.

None< Default >

Even

Odd

Address Set Set the communication address (range from 0 to 30)

Address=

＊＊

Port Mode

Trigger< Def >

RI/DFI

DIGITAL I/O

Trig Source

Immediat<Def>

External

Bus

RI Mode

Off< Default >

Select mode of digital port

Setting the trigger mode

Pressing trigger pulse

Shift

Trigger

keys will generate a

Ext. Trigger signal is applied to the digital port in the rear panel.

Remote command trigger mode.

Configure the Remote Inhibit (RI) mode

Disable this function

Latching

Live

DFI Source

Off< Default >

QUES

OPER

ESB

RQS

Configure the Discrete Fault Indicator (DFI) mode

Question Bit

Operation Bit

Event State Bit

Require Bit

Key Lock Set Setting keypad password.

Press

Enter

directly to disable the key lock function.

Password= ﹡﹡﹡﹡

Exit

System Set

Max Volt. set

Max= ﹡﹡﹡﹡

Step Volt Set

Set the Maximum Voltage.

Set the voltage step

Exit

List Set

Step=﹡﹡﹡﹡

Configure list files

Call ListFile

Edit ListFile

Recall list operation file.

Edit list operation file.

Continuous

Once

Repeat

Step

Once

Repeat

Save Mode Set

8 X 25 Steps

Users can allocate 4 types of memory space to save the list file.

4 X 50 Steps

2 X 100 Steps

1 X200 Steps

Exit

Out On Timer Output timer. If Timer State is set to ON, power supply output will turn off after the timer elapsed.

Timer State Setting POWER ON timer state

On Enable Output Timer. Output will turn off after value set in menu “Timer Set” counted down to zero.

Off< Default >

Timer Set Setting time of POWER ON timer.

Timer= ﹡﹡S

Exit

3.6.2 Menu Function

ShortCut Recall

This parameter enables a Shortcut version of the Recall functionality available by pressing the Recall button ( see

3.5)

To enable this function, do the following:

） Press Shift

When Config is displayed, press

） Press ▲、▼ to scroll to ShortCut Recall then press

ENTER

） Press ▲、▼to turn this feature On，press

4) Press Esc twice to exit from the menu

ENTER

to confirm.

Now you can conveniently recall up to 9 settings by simply pressing one of the corresponding number keys 1 – 9.

The setting previously stored at that location, (using the Save function), will be retrieved and activated. If the selected location is empty, EEPROM ERROR will be displayed.

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Setting the Baud Rate (>BAUDRATE)

This parameter configures the baud rate for serial communication. Possible values are 4800，9600，19200 or

38400. When operating the power supply in remote mode, make sure that you configure identical baud rate settings for the power supply and the computer. The default setting is 4800.

Setting Address (>ADDRESS)

With this parameter, it is possible to address each instrument. The address range is 0 to 30. The default address is zero.

Port Mode

A 4-pin connector in the rear panel is provided for digital input and output signals. This digital port can be configured to provide Fault/Inhibit, External Trigger or Digital I/O functions. The signal level is TTL.

TRIGGER: Pins 1 and 2 can be used to apply external trigger sources to the power supply. These pins can also be used to control the list operation

RI/DFI

：

The Inhibit Input pin can be used to control the output state of the power supply (RI function).

The Fault Output pin (DFI function) can be used to indicate internal faults of the power supply.

DIGITAL I/O

： Read and control output and input state of the 2 available pins.

Mode

Pin

1 Trigger in Inhibit Input Digital Input

2 GND GND GND

3 No Use Fault Indicator Output Digital Output

4 No GND

Trigger Operation

The power supply supports 3 different trigger modes. Immediate, External and Bus. Configure one of the trigger sources before performing trigger operating.

• Trigger Key:

When this function is enabled, you can generate an immediate trigger pulse by pressing

Trigger.

Shift

• 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

When this function is enabled, you can trigger the power supply by sending a *TRG or TRIgger command to the power supply

Remote Inhibit (RI) - Input

Used to turn off the output of the power supply. Can be used to turn off several power supplies simultaneously.

The RI input has 3 modes: LATCHING

、L IVE and OFF

LATCHING When the TTL signal at the RI port transitions from TTL High to Low, the output of the power supply will turn off.

LIVE The output state of the power supply changes according to the signal level applied to the RI port.

If the level is TTL high, the power supply output is on; if the level at the RI port is TTL Low, the output of the power supply is off.

OFF The signal applied to the RI port does not affect the output state of the power supply.

Discrete Fault Interupt (DFI) - Output

Used to indicate that a fault has occurred in power supply.

The DFI function can be activated by state changes of the QUES, OPER, ESB, RQS bits

QUES

：

The output level of DFI reflects the state of the QUES bit. When the QUES bit is 1, the DFI output goes to a low level. When QUES bit is 0, DFI the output goes High

OPER

：

The output level of DFI reflects the state of the OPER bit.

ESB

：

The output level of DFI reflects the state of the ESB bit.

RQS

：

OFF

：

The output level of DFI reflects the state of the RQS bit.

The output level of the DFI port remains high.

KEY LOCK

It is possible to set a password to lock the function keys. After setting the password, all the function keys on the front panel will be locked except the OUT On/Off key. You must enter the correct password to enable the keys again. If you don’t want to lock the function keys and you selected the >KEY LOCK menu, simply pres the Enter key, do NOT enter any numbers

When shipped from the factory, no password is set and the function keys are unlocked. The start bit of your desired password shouldn’t be 0.

List Set

This mode allows you to create a sequence of steps, store it into the power supplies non volatile memory and execute it. The input parameters for generating a list include the name of the list file, the input steps (no more than 200 steps), the step time (the minimum is 1mS) and the value of each step. The list file can be stored in

ROM with a capacity of 4K from where it can be recalled. This memory area is divided into 4 areas A, B, C, D.

Each area can store a certain amount of groups, and each group has an assigned maximum capacity according to the table below:

Memory area Number of groups/ area Capacity/group

Example: Group C con store 4 groups, each group has a maximum capacity of 1 KByte.

The power supply executes a list in CONTINIOUS or Step mode. In CONTINIOUS mode, the power supply will start executing the list once, as soon as a trigger signal is received, then it will wait until the next trigger signal is received.

Before you edit the list file, set the trigger source in the menu to “immediate”.

Example:

1) Press

Shift

2) Press up or down key to select “Config”, press

Enter

3) Press up or down key to select “Trig Source”, press

to confirm.

Enter

to confirm.

4) Press up or down key to select “Immediat”, press

Memory area

Enter

to confirm.

Number of groups/ area Capacity/group

Example: Group C can store 4 groups, each group has a maximum capacity of 1 KByte.

Operation

：

Generate file: 2 cycles, continuous mode

）

Press

Shift

Menu into menu operation.

）

VFD displays Config

，press▼to select List Set，press Enter to confirm.

）

VFD displays Call ListFile

，press▼to select Edit ListFile, press

Enter

to confirm.

）

VFD displays Continuous

，press Enter

to confirm.

）

VFD displays Repeat

，press

Enter

to confirm

）

VFD displays Second, Select ms then press

Enter

to confirm

）

VFD displays List Count= _

，press numeric key or move the rotary knob, set number of cycles ( in this example, count is 2)

，press

Enter

to confirm.

）

VFD displays1th=

＊.＊＊＊＊V, press numeric key or move the rotary knob, set the maximum voltage, press

Enter

to confirm.

）

VFD displays 1th=

＊.＊＊＊＊A, press numeric key or move the rotary knob, set the maximum current, press

Enter to confirm.

） VFD displays 1th=＊mS, press numeric key or move the rotary knob, set delay time, press Enter to confirm.

） VFD displays 2th=＊.＊＊＊＊V, press numeric key or move the rotary knob, set the maximum voltage, press

Enter to confirm.

） VFD displays 2th=＊.＊＊＊＊A, press numeric key or move the rotary knob, set the maximum current, press

Enter

to confirm.

） VFD displays 2th=＊mS，press numeric key or move the rotary knob, set delay time, press Enter

to confirm.

） VFD display Store File_，press numeric key or move the rotary knob, set the register number（1 to 8）, press

Enter

to confirm.

） Press

Esc

two times to escape menu operation.

Execute file

） Press

Shift

List

to set the list file, then press

Shift

Trigger

to run the list file. Press

Shift

List to stop.

If you have created several list files, you can call the list file that you need by “Call ListFile” function in the menu. Press

Shift

Esc

two times to exit menu operation. And then press

Trigger

to run the file that you called. Press

Shift

List

Shift

List to stop running.

to set it, press

Continuous mode: Once the trigger signal is received, the programmed list will be executed once. Once finished, the instrument will pause until the next trigger signal is received.

Trigger Trigger

Step mode: The power supply will advance to the next step only after it receives a trigger signal.

Trigger

Trigger Trigger

Trigger

Trigger Trigger

Digital I/O

When the digital port of the power supply mode is in DIGITAL I/O mode and the power supply is configured for remote operation, you can send SCPI command （DIGital:INPut[:STATe?] and DIGital:OUTPut[:STATe?]）to

read and set the state of the output and input port.

3.7 Output Operation

For front panel operation, press

On/Off

to enable/disable the output. If the power supply is in remote control mode, you can send SCPI command (OUTPut ON|OFF) to change the state of output.

3.8 Remote Sense and digital port functions

8 pin connector in rear panel

S INH GND FLT GND

+S,-S Remote sense pins

Remote voltage sensing is used to maintain good regulation at the load and reduce the degradation of regulation that would occur due to the voltage drop in the leads between the power supply and the load. By connecting the supply for remote voltage sensing, voltage is sensed at the load rather than at the supply's output terminals. This will allow the supply to automatically compensate for the voltage drop in the load leads and improve regulation.

You must set remote sense mode before you start remote test function.

+,- Output

These pins are identical to the out put terminals in the front

INH Inhibit Input pin

This pin has multiple functions: a) When “Port Mode” in the menu is set to “Trigger”, INH is configured as trigger Input. b) When “Port Mode” in the menu is set to “RI/DFI”, INH can be used to turn the power supply output on/off.

INH can be configured in 3 ways:

LATCHING

：When the level of INH port changes from high to low, the output of power supply turns off.

LIVE

：

The output state of power supply changes according to the level of the INH port. If the level

OFF

： of INH is TTL High, the output is on. If the level at pin INH is TTL Low, the output of the power supply is off.

The level state of INH does not affect the output state of the power supply. c) When “Port Mode” in the menu is set to “DIGITAL I/O”, INH port functions as a digital input pin. The status of the pin can be read via SCPI command

FLT: Fault Output pin

This pin hat multiple functions: a) When “Port Mode” in the menu is set to “Trigger”, FLT has no function. b) When “Port Mode” in the menu is set to “RI/DFI”, the FLT pin can be used to determine the reason of a power supply fault.

The status of FLT can be derived from bits QUES, OPER, ESB, RQS or it can be disabled

QUES

： The output level of FLT reflects the state of the QUES bit. When the QUES bit is 1, FLT output a

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Low signal, otherwise, if QUES bit is 0, FLT goes High.

OPER

： The output level of FLT reflects the of the OPER bit.

ESB

： The output level of FLT reflects the state of the ESB bit.

RQS

： The output level of FLT reflects the state of the RQS bit.

OFF

： The output level of FLT remains high. c) When “Port Mode” in menu is set to “DIGITAL I/O”, FLT functions as an output pin. The status of the port can be programmed via SCPI command.

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:

+

DVM

Load

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

Ω

Meter mode.

Shift

followed by V/m

Ω

to toggle between Voltmeter

3.10 Milliohm Meter

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

+

DV M

OUTPUT

Load

To measure resistance:

1) Enable Ohmmeter mode: Press

0.1W

）

2) Press

Shift

followed by V/m

Ω

（Display will show ---.—m

Ω

Range

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

Measurement range

Test voltage (Output)

0.1W

3.3V

10W

10V

4. Remote Operation

The DB9 interface connector on the rear panel of the power supply can be connected to a RS-232 or USB interface via the included adapter cable. This chapter describes how to use a computer to control the output of the power supply.

4.1 Communication cable

RS232 Communication cable IT-E131

The DB9 interface connector on the rear panel of the power supply provides a TTL voltage level interface. Use the communication cable (IT-E131) to connect the DB9 interface connector of the power supply to the RS-232 interface connector of the computer

IT-E131 communication cable

Power

Note: It is not possible to connect the DB9 connector of the power supply via a standard

RS232/USB cable to a PC’s RS232 port or USB port.

USB Communication cable IT-E132

The DB9 interface connector on the rear panel of the power supply provides a TTL voltage level interface. Use the communication cable (IT-E132) to connect the DB9 interface connector of the power supply to the USB interface connector of the computer.

Power

Note: Before you can use the USB communication cable, you must install the USB driver which can be found on the included installation disk.

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)

Data Frame Format

Parity=None

Start

Bit

8 Data Bits

Stop

Bit

Parity=Odd,

Even

Start

Bit

8 Data Bits

Parity

Bit

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

DB9 Interface Details

Stop

Bit

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-E131 or IT-E132 isolated communication cable.

Note: 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 connecting several instruments, e.g. via 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 address will allow the user to correlate each virtual COM port with the address assigned to each instrument.

4.3 SCPI Command Overview

Common IEEE488.2 Commands

*CLS

*ESE

*ESE?

*ESR?

*IDN?

*OPC

*OPC?

*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> }

[:DATA] {<numeric value>}

:DVM

:SAVe

:INITital

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Output Commands

OUTPut

[:STATe] {<bool>}

[:STATe]?

:TIMer

[:STATe] {<bool>}

[:STATe]?

:DATA {<timer>}

:DATA?

[SOURce:]

MODE {<FIXed|LIST|DRM>}

MODE?

VOLTage

[:LEVel] {<n>}

[:LEVel]?

:PROTection

CURRent

[:LEVel] {<n>}

[:LEVel]?

LIST

:STATe?

[:LEVel] {<n>}

[:LEVel]?

: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}

Input Measure Command

MEASure

[:SCALar]

:VOLTage[:DC]?

:CURRent[:DC]?

:POWer[:DC]?

:DVM[:DC]

？

:RESistance[DC]?

Port Configuration Commands

[SOURce:]

SYSTem

: SENSe [:STATe] {<bool>}

[:STATe]?

PORT

:MODE?

DFI

:SOURce?

DIGital

: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.

BIT Signal Meaning

CAL

WTG

UNR

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.

OPC

QYE

DDE

EXE

CME

PON

QUES

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 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.

ESB

MSS

RQS

OPER

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

Unr n.u. n.u. n.u

R n.u n.u

Operation event register Status byte register

condition event enable event enable

CV n.u

Standard event status register

event enable

OPC

0 0 n.u

QYE

DDE

EXE

CME

n.u

PON

7 7

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 the 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

Bit position

Bit Name

7 6 5

DDE Device-dependent error

QYE Query error

OPC Operation complete

PON Not used CME EXE DDE QYE Not used OPC

Bit Weight

PON Power-on

128

CME Command error

EXE Execution error

*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

BK Precision manufacturer

XXXX product mode

XXXXXX product serial number

．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

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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

？

Return parameter

：<NR1>

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

：*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)

(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

Config data error

Error Calibration data

Factory Data error

Command syntax

：SYST:ERR?

Parameter

：None

Return parameter

：〈NR1〉，〈SRD〉

SYSTem:VERSion?

This command queries the software vers i on.

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

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

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

Bit Name no use no use no use RI CC CV WTG CAL

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 will be set to 1.

Command syntax

：STATus: OPERation:ENABle <NRf>

Parameter

：0~255

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>

Parameter

：FIXed|LIST|DRM

*RST value: FIXed

Example

： MODE FIX

Query syntax

：[SOURce:] MODE？

Return parameter

：<CRD>

[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

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*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

Command syntax

：[SOURce:]LIST:CURRent[:LEVel]

Parameter

：0~30A

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？ 1；

Return parameter

：<NR2>

[SOURce:]LIST:WIDth

This command sets the minimum step time.

Command syntax

：[SOURce:]LIST:WIDth <NRf>

Parameter

：MIN TO MAX|MIN|MAX

Unit

：S mS

Example

：LIST:WID 1, 100mS;

Query syntax

：[SOURce:]LIST:WIDth？

Parameter

：None

Example

：LIST:WID? 1;

Return parameter

：<NR2>

[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 group per store area, 400 steps

．2 groups per storage area, each group contains 200 steps.

．4 groups per storage area, each group has 100 steps.

．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

This command saves the list file to a register (non volatile m e mory).

Command syntx

：[SOURce:]LIST:SAVe <NR1>

Parameter

：1~8

Example

：LIST:SAV 1

[SOURce:]LIST:RCL

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

：R

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.

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.

Command syntax

：SOURce:OUTPut[:STATe]

Paremeter

：OFF|ON|0|1

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[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:SORU

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):

Shift

plus

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

Calibration commands

CALibration:SECure:[STATe]

Set protection mode enable or disable when calibrating the power supply.

Command syntax

：CALibration:SECure:[STATe ]{ON|OFF>,[<password>]}

Parameter

：0|1|ON|OFF, ‘5811

Example

：CAL:SEC 1, ‘5811; CAL:SEC OFF

Query syntax

：CALibration:SECure:STATe？

Parameter

：None

CALibration:VOLTage:LEVel

This command sets the voltage calibration point.

Command syntax

：CALibration:VOLTage:LEVel <point>

Parameter

：P1|P2

CALibration:VOLTage [:DATA]

{<numeric value>}

Returns the actual output voltage value of calibration point.

Command syntax

：CALibration:VOLTage [:DATA] <NRf>

Parameter

：<NRf>

Example

：CAL:VOLT 30.0002V

CALibration:CURRent:LEVel

This command sets the current calibration points. P1,P2,P3,P4.

Command syntax

：

CALibration:CURRent:LEVel <point>

Parameter

：P1|P2

CALibration:CURRent [:DATA]

{<numeric value>}

Return actual output current value to calibration point.

Command syntax

：

CALibration:CURRent [:DATA] <NRf>

Parameter

：<NRf>

Example

：CAL:VOLT 3.0002A

CALibration:DVM:LEVel

This command can set current calibration point. P1,P2,P3,P4.

Command syntax

：CALibration:DVM:LEVel <point>

Parameter

：P1|P2|P3|P4

CALibration:DVM [:DATA]

{<numeric value>}

Return actual output current value to calibration point.

Command syntax

：CALibration:DVM [:DATA] <NRf>

Parameter

：<NRf>

Example

：CAL:VOLT 3.0002A

CALibration:SAVe

This command saves the calibration coefficient into nonvolatile register.

Command syntax

：CALibration:SAVe

Parameter

：None

CALibration: INITial

This command resets the current calibration coefficients to thei r default values.

Command syntax: CALibration: INITial

Parameter: None

5 Specifications

5.1 Specifications

Parameter

±(

Output Ratings

( 0 °C~40 °C)

Load Regulation

％of output+offset)

Line Regulation

％of output+offset)

Programming resolution

Readback/Meter resolution

9120A 9121A 9124

Voltage 0 ~32V 0 ~20V

Current 0~3A 0~5A

LVP*

Voltage

0 ~33V 0 ~21V

0~72V

0~1.2A

0 ~73V

<0.01

％+2mV <0.01％+2mV

Current

<0.05

％+1mA <0.05％+0.3mA

Voltage

Current

<0.01

％+1mV <0.01％+1mV

<0.05

％+0.1mA

≤0.05

％+0.05mA

Voltage 0.1mV

Current 0.1mA

Voltage 0.1mV 0.1mV

Current 0.01mA 0.05mA

Voltage 0.5mV

0.1mV

0.05mA

0.5mV

0.01mA

2mV

Front Panel setting resolution

Current 0.1mA 0.1mA

Programming accuracy,

12 months (25 °C ± 5 °C)

±(

％of output+offset)

Voltage <0.03%+3mV

Current <0.05%+2mA

≤0.03

≤0.05

％+6mV

％+1mA

Readback / Meter accuracy

12months (25 °C ± 5 °C)

±(

％of output+offset)

Ripple & Noise

(20Hz ~20MHz)

Voltage <0.02%+3mV

≤0.02

％+5mV

Current <0.05%+2mA

≤0.05

％+1mA

Voltage

Current

≤ 4mV p-p

≤ 3mV p-p

≤ 3mArms ≤ 3mArms

≤ 5mV p-p

≤ 3mArms

Voltage <0.02%+3mV

≤0.02%+5mV

Temperature coefficient,

(0 °C~40 °C)

±(

％of output+offset)

Readback temperature, coefficient,

±(

％of output+offset)

Current

<0.05

％+2mA <0.05％+0.5mA

Voltage <0.02%+3mV

Current

<0.05

％+2mA

≤0.02%+5mV

≤0.05

％+0.5mA

DVM Accuracy

DVM Resolution

Voltage

0~12V range: 0.02%+2mV

0~40V range: 0.02%+3mV

0~12V range: 0.1mV

0~40V range: 1mV

Ohm meter

Weight mΩ net

Accuracy: 0.1%, for Voltage and Current >= 10% of FS

(full scale)

Accuracy: 0.3% for Voltage and Current >= 3% of FS

19.8 lbs, (9 kg)

Dimensions WxHxD

214.5mm × 88.2mm × 354.6mm

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.

NOTE: Specifications and information are subject to change without notice. Please visit www.bkprecision.com

for the most current product information.

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)

220AV±10%

，47～63Hz

110AV±10%

，47～63Hz

Maximum output power

9120A 9121A 9124

96W 100W 86W

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.

Dimensions:

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

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Key features

Very high accuracy & resolution
Low ripple & low noise
Fast settling time
5 1/2 digit DVM & mΩ meter
Convenient data entry
Over Temp. protection
Compact footprint
Bright & easy to read display
Excellent temp. stability
SCPI compatible command set

Frequently asked questions

You can set the voltage by either using the knob or entering the desired value with the numeric keypad and pressing "Enter".

You can store up to 50 different operating states in memory locations 1 through 50 by pressing the "Save" key and selecting a memory location using the knob. To recall a setting, press "Recall", select the desired memory location using the knob, and press "Enter".

The Remote Sense function allows you to maintain good regulation at the load by connecting the supply for remote voltage sensing. This will allow the supply to automatically compensate for the voltage drop in the load leads and improve regulation.

The Digital Volt meter is built-in and can measure DC volts in a range from 0 - 40V. To measure voltages, connect the leads to the DVM terminals in the rear panel.