Data Sheet
Programmable DC Power Supplies
9120A Series
Technical data subject to change
© B&K Precision Corp. 2021 www.bkprecision.com
Model 9120A 9121A 9122A 9123A 9124
Output Voltage 0 - 32 V 0 - 20 V 0 - 60 V 0 - 30 V 0 - 72 V
Output Current 0 - 3 A 0 - 5 A 0 - 2.5 A 0 - 5 A 0 - 1.2 A
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.
Features and Benefits
n Excellent display resolution
n Fast transient response time (< 150 µs)
n SCPI compatible
n Communicate via USB Interface, using
included USB to TTL serial converter cable
n GPIB interface (model 9123A only)
n Closed case calibration
n Compact size for bench use or rack mountable
(2U x 1/2U size)
n DVM and Milliohm Meter
n Discrete Fault Indicator/Remote Inhibit
(DFI/RI). Useful for turning multiple power
supplies On/Off simultaneously
n Application Software for front panel emulation
and simple test sequence generation included
n Sheathed banana plug terminals for safety
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.
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
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.
Programmable DC Power Supplies
9120A Series
2www.bkprecision.com
Encoder knob for quick
analog style control
Bright, dual LED displays
Numeric keys for direct entry of
voltage and current values
Remote Sense and digital
port functionality
Serial interface connector for USB
communication. Model 9123A also
supports control via GPIB interface.
Thermostatically controlled
cooling fan User accessible fuse
DVM and mΩ meter
Rear Panel
Front Panel
Output ON/OFF
switch
4mm sheathed
safety banana jacks
The 9120 series uses 4mm
sheathed banana jacks that
accept sheathed or shrouded
banana plugs and meet the
latest international safety
standards.
Programmable DC Power Supplies
9120A Series
3www.bkprecision.com
v020421
Specifications
Model 9120A 9121A 9122A 9123A 9124
Output Ratings
( 0 °C - 40 °C)
0 - 32 V 0 - 20 V 0 - 60 V 0 - 30 V 0 - 72 V
0 - 3 A 0 - 5 A 0 - 2.5 A 0 - 5 A 0 - 1.2 A
Load Regulation
±(% of output + offset)
< 0.01% + 2 mV1< 0.01% + 2 mV1< 0.01% + 2 mV1< 0.01% + 2 mV1
< 0.05% + 2 mA < 0.05% + 2 mA < 0.05% + 3 mA < 0.05% + 3 mA
Line Regulation
±(% of output + offset)
< 0.01% + 1 mV1< 0.01% + 2 mV1< 0.01% + 1 mV1< 0.01% + 1 mV1
< 0.05% + 0.1 mA ≤ 0.05% + 0.05 mA ≤ 0.05% + 0.1 mA ≤ 0.05% + 0.05 mA
Programming resolution 0.5 mV 1 mV 0.5 mV 2 mV
0.1 mA 0.1 mA 0.1 mA 0.02 mA
Readback / Meter
resolution
0.1 mV 0.1 mV 0.5 mV 0.1 mV 0.5 mV
0.01 mA 0.05 mA 0.05 mA 0.05 mA 0.01 mA
Front panel
setting resolution
0.5 mV 1 mV 0.5 mV 2 mV
0.1 mA 0.1 mA 0.1 mA 0.02 mA
Programming accuracy,
12 months (25 °C ±5 °C)
±(% of output + offset)
< 0.03% + 3 mV ≤ 0.03% + 6 mV ≤ 0.03% + 3 mV ≤ 0.03% + 6 mV
< 0.05% +2 mA ≤ 0.05% + 1.5 mA ≤ 0.05% + 2.5 mA ≤ 0.05% + 1 mA
Readback/ Meter accuracy
12 months (25 °C ±5 °C)
±(% of output+offset)
< 0.02% + 3 mV ≤ 0.02% + 6 mV ≤ 0.02% + 2.5 mV ≤ 0.02% + 5 mV
< 0.05% + 2 mA ≤ 0.05% + 1.5 mA ≤ 0.05% + 2.5 mA ≤ 0.05% + 1 mA
Ripple & Noise
(20 Hz - 20 MHz)
≤ 4 mVp-p ≤ 3 mVp-p ≤ 5 mVp-p ≤ 4 mVp-p ≤ 5 mVp-p
≤ 3 mArms ≤ 3 mArms ≤ 3 mArms ≤ 4 mArms ≤ 3 mArms
Temperature coefficient,
(0 °C - 40 °C)
±(% of output + offset)
< 0.02% + 3 mV ≤ 0.02% + 6 mV ≤ 0.02% + 3 mV ≤ 0.02% + 5 mV
< 0.05% + 2 mA < 0.05% + 1 mA < 0.05% + 2 mA < 0.05% + 0.5 mA
Readback temperature
coefficient,
±(% of output + offset)
< 0.02% + 3 mV ≤ 0.02% + 6 mV ≤ 0.02% + 3 mV ≤ 0.02% + 5 mV
< 0.05% + 2 mA ≤ 0.05% + 1 mA ≤ 0.05% + 2 mA ≤ 0.05% + 0.5 mA
Transient Response < 150 µs for output to recover to within 75 mV following a change from 100 mA to 1 A
DVM Accuracy 0 - 12 V range: 0.02% + 2 mV
0 - 40 V range: 0.02% + 3 mV
DVM Resolution 0 - 12 V range: 0.1 mV
0 - 40 V range: 1 mV
Milliohm Meter Accuracy 0.6% (for Voltage and Current ≥ 11% of full scale)
1.8% (for Voltage and Current ≥ 4% of full scale)
State Storage Memory 50 user configurable memory locations
Operating Temperature 0 °C to 40 °C, < 75% R.H.
Storage Temperature -20 °C to 70 °C, < 85% R.H
AC Input 115 V / 220 VAC ± 10%, 47 Hz to 63 Hz
Weight 19.8 lbs (9 kg) 21.2 lbs (9.6 kg) 19.8 lbs (9 kg)
Dimensions (W x H x D) 8.45” x 3.8” x 13.9” (214 x 88.2 x 354.6 mm)
Warranty 3 Years
Included Accessories User manual, power line cord, USB to TTL serial converter IT-E132B, and software installation disk.
Model 9123A also includes IT-E135 GPIB to TTL conversion adapter cable
Optional Accerssories IT-E151 rack mount kit
“1” = while using remote sense
