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Power Supply Buying Guide

BK 9123A 30V/5A Programmable DC Power Supply

BK Precision 9123A
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BK Precision 9123A 30V/5A Single Output Programmable DC Power Supply w/ RS232 and GPIB


  • Excellent display resolution
  • Fast transient response time (< 150 µs)
  • SCPI compatible
  • Communicate via RS232 or GPIB interface, using the included RS232 to TTL or GPIB to TTL Serial Converter cable. USB communication is optional and requires a USB to TTL Serial Converter cable (order IT-E132)
  • Closed case calibration
  • Compact size for bench use or rack mountable (2U x 1/2U size)
  • DVM and Milliohm Meter
  • Discrete Fault Indicator/Remote Inhibit (DFI/RI). Useful for turning multiple power supplies On/Off simultaneously
  • Application Software for front panel emulation and simple test sequence generation included
  • Sheathed banana plug terminals for safety
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List Price: $845.00
Sale: $717.74
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Product Information

BK 9123A 0-30V/0-5A Single Output Programmable DC Power Supply


BK 9120A Series Programmable DC Power Supplies

  • Very high accuracy and resolution
  • Bright and easy to read display
  • Low ripple and low noise
  • 5 1/2 digit digital voltage meter and mΩ meter
The 9120A series are laboratory grade, programmable DC Power Supplies providing great performance and features not found in other supplies in this price category. The power supplies were designed to meet the needs of today’s applications in R&D design verification, production testing or university labs that require clean and reliable power, high resolution/accuracy and fast transient response time.

Front Panel Operation
The numeric keys and rotary knob provide a convenient interface for setting output levels quickly and precisely. Voltage and current can be set to a maximum resolution of 0.5 mV (2 mV for 9124) and 0.1 mA respectively. Up to 50 parameters can be stored and recalled from internal memory.
Front Panel

Extra Features
The 9120 series’ digital port offers a variety of configurations. The port can operate in digital I/O, external trigger and DFI/RI (Discrete Fault Indicator/Remote Inhibit) mode. The RI feature can be used for turning several power supplies On/Off simultaneously. External triggering can be used in combination with List mode.

The included application software supports front panel emulation and allows users to generate simple test sequences without the need to write source code.

Additionally, the power supply comes with a built-in 51/2 digit DVM and high resolution milliohm meter supporting 4 wire measurements.

Remote Interface
Rear Panel

The power supplies can be remotely controlled from any PC through a USB (virtual com) interface, allowing the user to program and monitor all parameters through easy to use SCPI commands. The power supplies come with a USB to TTL serial converter. Additionally, model 9123A can be controlled via GPIB interface and includes a GPIB to TTL conversion adapter cable.

What's In The Box

  • User manual
  • Power line cord
  • USB to TTL serial converter IT-E132B
  • Software installation disk


BK Precision 9123A Specifications
Output Ratings (0 °C - 40°C)
Voltage 0 ~ 30V
Current 0 ~ 5A
Load Regulation ±(%of output+offset)
Voltage ≤0.01% + 2mV
Current ≤0.05% + 1.5mA
Line Regulation ±(%of output+offset)
Voltage ≤0.01% + 1mV
Current ≤0.05% + 0.1mA
Programming Resolution
Voltage 1mV
Current 0.1mA
Readback/Meter Resolution
Voltage 0.1mV
Current 0.05mA
Front Panel setting resolution
Voltage 0.5mV
Current 0.1mA
Programming accuracy, 12 month ( at 25°C ± 5°C) ±(%of output+offset)
Voltage ≤0.03% + 3mV
Current ≤0.05% +2.5mA
Readback accuracy, 12 month (at 25°C ± 5°C) ±(%of output+offset)
Voltage ≤0.02% + 2.5mV
Current ≤0.05% +2.5mA
Ripple & Noise (20Hz~ 20MHz)
Voltage ≤4mVp-p
Current ≤4mArms
Temperature coefficient (0°C ~ 40°C), (±%of output+offset)
Voltage ≤0.02%+3mV
Current ≤0.05%+2mA
Readback Temperature coefficient ±(%of output+offset)
Voltage ≤0.02%+3mV
Current ≤0.05%+2mA
DVM Accuracy
Voltage 0 ~ 12V range: 0.02%+2mV
  0 ~ 40V range: 0.02%+3mV
DVM Resolution
Voltage 0 ~ 12V range: 0.1mV
  0 ~ 40V range: 1mV
Milliohm Meter Accuracy
0.1% for Voltage and Current ≥ 10% of FS
  0.3% for Voltage and Current ≥ 3% of FS
net 21.1 lbs. (9.6 kg)
W x H x D 8.45" x 3.47" x 13.9"
  214.5mm x 88.2mm x 354.6mm

BK Precision 9123A Product Specifications Summary:
(for full specs please see the full specs tab or the data sheet)

Power Supplies/DC Power Supplies Template

Voltage Output 1 What's This?Variable
Max Voltage Output 1 What's This?30 V
Min Voltage Output 1 What's This?0 V
Current Output 1 What's This?Variable
Max Current Output 1 What's This?5 A
Min Current Output 1 What's This?0 A
Meter Type What's This?Digital
Max Display Resolution Current0.1 mA
Max Display Resolution Voltage0.5 mV
Constant current/voltageYes
Remote Sensing What's This?Yes

Test Equipment General Attributes

Warranty1 YEARS
Power Supply Voltage120V/220V Universal
Data Logging What's This?No
Interfaces I/O GPIB, RS-232, Remote Sense
Product Weight18.8 LBS
Product Height13.9 IN
Product Length8.45 IN
Product Width3.47 IN
HTS/Schedule B Number8504.40.9520
Country of OriginChina


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