B&K Precision 9120A, 9121A, 9122A, 9123A, 9124 Instruction Manual
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Model: 9120A, 9121A, 9122A, 9123A, 9124, 9150, 9151, 9152, 9153
Single Output Programmable DC Power
USER MANUAL
Supply
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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 .............................................................................................................. 14
3.3 Setting the Voltage .................................................................................................................................... 14
3.4 Setting the Current.................................................................................................................................... 14
3.5 Save and Recall Operation ....................................................................................................................... 14
3.6 Menu Operation ........................................................................................................................................ 15
3.6.1 Menu Description .......................................................................................................................... 15
3.6.2 Menu Function .............................................................................................................................. 17
3.7 Output Operation ...................................................................................................................................... 22
3.8 Remote Sense and digital port functions .................................................................................................. 22
3.9 Digital Volt Meter (DVM) ........................................................................................................................ 23
3.10 Milliohm Meter ...................................................................................................................................... 24
4. Remote Operation ................................................................................................ 24
4.1 Serial adapter cables ................................................................................................................................. 25
4.2 Communication between Power Supply and PC ...................................................................................... 26
4.3 SCPI Command Overview ....................................................................................................................... 28
Common IEEE488.2 Commands ........................................................................................................... 28
Essential SCPI Commands ..................................................................................................................... 28
Port Configuration Commands ............................................................................................................... 30
Trigger Command .................................................................................................................................. 30
SCPI Condition Register ........................................................................................................................ 30
4.4 SCPI Command Description .................................................................................................................... 32
Common IEEE488.2 Commands ........................................................................................................... 32
Essential SCPI Commands ..................................................................................................................... 34
Output Commands .................................................................................................................................. 37
List File Commands ............................................................................................................................... 38
Interface Configuration Commands ....................................................................................................... 42
Trigger commands .................................................................................................................................. 43
Calibration commands ............................................................................................................................ 44
5. Specifications ........................................................................................................ 46
5.1 Specifications ........................................................................................................................................... 46
5.2 Supplemental Characteristics ................................................................................................................... 48
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1. Introduction
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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
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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, RS232 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 Indica tor/Remote Inhibit (DFI/RI). Can be used to turn off power supplies simultaneously.
digit digital voltage meter and mΩ meter
(DFI available for models 9120A, 9121A, 9122A, 9123A, 9124 only)
List Mode: Generate, store and execute test sequences without the need for an external computer
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2. Quick Reference
3
2
5
1
2
3
4
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2.1 The Front Panel
For Models: 9120A, 9121A, 9122A, 9123A, 9124
4 5 6 7
For Models: 9150, 9151, 9152, 9153
1 2
1
3 4
6 7
VFD display
Rotary knob
Power switch
Numeric keys, auxiliary. functions
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5
6
7
2
3
4
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2.2 The Rear Panel
For Models: 9120A, 9121A, 9122A, 9123A, 9124
Function keys
Up/Down keys and “Enter” key
Output term inals
Digital Voltmeter te rminals (For Model 9150, 9151, 9152,
9153)
1 2
3 4 5 6
For Models: 9150, 9151, 9152, 9153
5 6
7
1
2
3
4
5
6
Digital Voltmeter terminals. (For models 9150, 9151, 9152, and
9153, these terminals are in the front panel)
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)
TTL interface connector for remote control
AC Power selection switch (110 V / 220 V)
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:
System Test, Please wait!
followed by
0.000V 0.0000A
0.000V 0.000V
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The first row displays the actual output voltage value and current and the state of power supply. The second row
ERR EEPROM
Out on/off
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
Press “Esc” to exit the display.
Sourc: XXV XA Meas: XXV
V er : 1.67 SN:5975002002
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:
ERROR CAL
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
Press the key. Notice the CV annunciator turning on.
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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
3) Set the voltage value
Set a different voltage value. 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.
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.
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To rack mount a single instrument, order rack mount kit IT-E151
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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On/Off
Shift
Numerical Keys/Secondary Shift Functions
Shift Functions V/mΩ: Toggl e betw een D VM 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
Set the voltage value
Set the current value
Save the current operating data to internal memory
Recall operating data from internal memory
Set the output state of the power supply
Use to access secondary functions
Up/Down and Entry key
▲：Up key
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▼：Down key
V-setV-set
Enter
Save
ENTER
9
0
Out on/off
I-Set
Enter
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
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
key. Use the knob to scroll to one of the memory locations 1 – 50. Press
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