DC POWER SUPPLIES
A Greater Measure of Confidence
www.keithley.com
1.888.KEITHLEY (U.S. only)
A Tektronix Company
The Model 2231A-30-3 Triple Channel DC Power Supply can output a total of 195W of power, provid-
ing the power levels needed to energize a wide range of circuits and devices for benchtop work. Two
channels can supply up to 30V at 3A each; the third channel can provide up to 5V at 3A. The Model
2231A-30-1 does not compromise on performance or convenience features, offering the versatility
and ease of use you need, so it can be the only DC power supply on your bench.
Quality DC Power
The Model 2231A-30-3 is a linear-based design with less than 5mVp-p noise per output. Voltage and
current settings have basic accuracies of 0.06% and 0.2% respectively. The load voltage and load cur-
rent readback results provide the same levels of accuracy, so you can be confident you are sourcing
accurate, low noise voltages and currents to your device-under-test (DUT).
Three Fully Independent Outputs
Each output of the Model 2231A-30-3 is fully programmable and can be turned on and off inde-
pendently from the other channels; it essentially provides three power supplies in one instrument.
You can power up both the analog circuitry and the digital circuitry of a printed circuit board or a
complete device, all with the same instrument.
All Outputs Are Isolated from Each Other and from Ground
Each output can power a circuit on a different ground reference. The low connection on each output
is not connected to any of the other outputs. That means one supply can test three separate circuits
on three different ground references or can power circuits that are transformer or optically isolated
from each other. Furthermore, all outputs are not referenced to ground, so the Model 2231A-30-3 can
power both floating circuits and grounded circuits.
Power Bipolar Circuits
Because the Model 2231A-30-3’s outputs are
isolated, one output can be turned effectively
into a negative source by connecting its high
terminal to the common reference point
of a bipolar circuit. A second output can
connect its low terminal to the same com-
mon reference point. The result is a positive
output and a negative output. If the two 30V
channels are used in this configuration, both
outputs can be changed at the same time by
using the Model 2231A-30-3’s tracking func-
tion. That allows varying both channels at
the same time while keeping their outputs at
identical magnitudes.
• Get three isolated, independent,
and adjustable outputs in one
instrument
• Output a total of 195W of power
with two 30V@3A outputs and
one 5V@3A output
• Set voltage outputs with 0.06%
basic accuracy and current
outputs with 0.2% basic
accuracy
• Output DC power with less than
5mVp-p noise
• Display voltage and current
measurements continuously
from all three outputs
• Double output levels by
connecting the two 30V channels
in series or parallel
• Store frequently used
configurations in any of 30 setup
memory locations
• Turn off any output after a
predetermined test time with
each channel’s output timer
• Control the supply from a PC
with an optional USB adapter
2231A-30-3
195W Triple Channel DC Power Supply
3-Year
Warranty
APPLICATIONS
• Engineering and science
student labs
• Service work
• Electronic design
V1 V2 V3
Circuit
Common 1
Circuit
Common 2
Circuit
Common 3
The Model 2231A-30-3 has three fully indepen-
dent, programmable outputs that are electrically
isolated from each other. This allows them to
power circuits that are on different grounds, such
as optically isolated circuits.
195W Triple Channel DC Power Supply
Multi-channel programmable DC power supplies
DC POWER SUPPLIES
www.keithley.com
1.888.KEITHLEY (U.S. only)
A Greater Measure of Confidence A Tektronix Company
2231A-30-3
195W Triple Channel DC Power Supply
Supply 60V or 6A
When the application requires outputting more than 30V or 3A, the two 30V channels can be com-
bined to double the output level. Wire the two outputs in series to deliver up to 60V or wire them in
parallel to deliver up to 6A. For your convenience, the Model 2231A-30-3 display will read the total
output, either voltage or current, to eliminate confusion. Also, the supply controls both outputs to
deliver the required voltage or current. There’s no need to set up each channel individually; the sup-
ply manages the channels for you, so combining channels is uncomplicated.
Wire the two 30V channels in series or parallel to double the output voltage to 60V or the
supplied current to 6A. The Model 2231A-30-3 has series and parallel modes that manage the
channels and display the total output. This display shows the supply’s parallel mode, including
the output voltage and the total current from the channels wired in parallel.
Easily Test, Monitor, and Protect Your Circuits
• Adjust the outputs with the rotary knob or enter the output values precisely using the keypad with
setting resolution of 10mV or 1mA.
• See the voltage and current readings on all channels at all times; the Model 2231A-30-3’s display
shows the readings from all three outputs simultaneously.
• Protect your DUT with an overvoltage protection setting for each output.
• Set timers to turn off an output after a programmed time to prevent excess stress on a circuit
under development.
• Store and recall instrument setups for frequently used tests to begin testing quickly. You can store
up to 30 unique test setups.
3.3V I/O
Circuits
1.2V µP core,
FPGAs
1.8V DDR
RAM
Voltage
Time
t1 t2 t3
Channel 1
On
Channel 2
On
Channel 3
On
0V
Safely power circuits up and down in the proper sequence using the three independently pro-
grammable output channels.
Control the Supply and Upload Data to a PC
Use the optional Model 2231A-001 USB Adapter to control the Model 2231A-30-1 via a PC’s USB inter-
face, then transfer readings from the outputs to combine with other test data for a more thorough
analysis of DUT performance. The 2231A-001 USB Adapter provides the flexibility to use the supply
under either manual or automated control.
Ordering Information
2231A-30-3
Triple Channel DC
Power Supply
Accessories Supplied
Documentation CD with User Manual
Certificate of Calibration
Power Cord
ACCESSORIES AVAILABLE
2231A-001 USB Adapter with USB Cable
RMU2U Rack Mount Kit
386759800 RMU2U Rack Mount Cosmetic Filler Panel
SERVICES AVAILABLE
2231A-30-3-EW 1 Year KeithleyCare® Gold Plan
2231A-30-3-5Y-EW 5 Year KeithleyCare Gold Plan
C/2231A-30-3-3Y-STD KeithleyCare 3 Yr Std Calibration Plan
C/2231A-30-3-5Y-STD KeithleyCare 5 Yr Std Calibration Plan
195W Triple Channel DC Power Supply
Multi-channel programmable DC power supplies
DC POWER SUPPLIES
2231A-30-3 195W Triple Channel DC Power Supply
Specifications
DC OUTPUT RATING
Channel 1 Channel 2 Channel 3
Voltage 0–30 V 0–30 V 0–5 V
Current 0–3 A 0–3 A 0–3 A
MAXIMUM POWER: 195W
LOAD REGULATION:
Voltage: ≤0.02% + 4mV
Current: ≤0.2% + 3mA
LINE REGULATION:
Voltage: ≤0.02% + 4mV
Current: ≤0.2% + 3mA
RIPPLE AND NOISE (20Hz–20MHz):
Voltage: ≤1mVrms/≤5mVp-p
Current: ≤6mArms
SETTING RESOLUTION:
Voltage: 10mV
Current: 1mA
SETTING ACCURACY:
Voltage: ≤0.06% + 20mV
Current: ≤0.2% + 10mA
READBACK RESOLUTION:
Voltage: 10mV
Current: 1mA
READBACK ACCURACY:
Voltage: ≤0.06% + 20mV
Current: ≤0.2% + 10mA
ISOLATION VOLTAGE, OUTPUT TO CHASSIS: Any output can
be isolated up to 240V (DC + peak AC with AC limited to a
maximum of 3Vpk-pk and a maximum of 60Hz) relative to the
earth ground terminal.
ISOLATION VOLTAGE, OUTPUT TO OUTPUT: Any output can
be isolated up to 240V (DC + peak AC with AC limited to a
maximum of 3Vpk-pk and a maximum of 60Hz) relative to
any other output terminal.
TRACKING AND COMBINATION MODES:
Tracking Mode: Maintains the ratio on the two 30V output
channels that is present when the control is activated.
Combination V1 + V2 Series Mode: Deliver up to 60 V
when CH1 and CH2 are wired in series. Meter reads back
combined voltage.
Combination I1 + 12 Parallel Mode: Deliver up to 3 A
when CH1 and CH2 are wired in parallel. Meter reads back
combined current.
GENERAL
MEMORY: 30 setup memory locations.
OUTPUT TIMER RANGE: 0.1s to 99999.9s.
DISPLAY: Vacuum fluorescent display.
CONNECTIONS:
Front: Power output jacks: 3-sets, safety-shrouded
banana jacks.
Rear: DB9 connector for remote control,
OVERTEMPERATURE PROTECTION: If the internal
temperature of the supply exceeds 85°C, the supply will
automatically turn off.
EMC COMPLIANCE: Conforms to European Union EMC
Directive.
SAFETY COMPLIANCE: Conforms to European Union Low
Voltage Directive.
POWER LINE RATINGS: 110VAC/230VAC ±10%.
POWER LINE FREQUENCY: 47Hz–63Hz.
MAXIMUM POWER CONSUMPTION: 750VA.
OPERATING ENVIRONMENT: 0° to 40°C, 5% to 80% rela-
tive humidity at up to 40°C.
STORAGE ENVIRONMENT: –20° to 70°C, 5% to 80%
relative humidity up to 40°C, and 5% to 60% relative
humidity from 40° to 70°C.
PHYSICAL CHARACTERISTICS
Height: 88.2 mm ( 3.5 in)
Width: 214.5 mm ( 8.5 in)
Depth: 354.6 mm (14 in)
Net Weight: 7.10kg (15.7 lbs.).
Shipping Weight: 9.40kg (20.7 lbs.).
WARRANTY: 3 years.
Model 2231A-30-3 rear panel showing
the communication port, line power
setting switch, and the power input
connector with fuse holder.
Specifications are subject to change without notice. All Keithley trademarks and trade names are the property of Keithley Instruments.
All other trademarks and trade names are the property of their respective companies.
KEITHLEY INSTRUMENTS ■ 28775 AURORA RD. ■ CLEVELAND, OH 44139-1891 ■ 440-248-0400 ■ Fax: 440-248-6168 ■ 1-888-KEITHLEY ■ www.keithley.com
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© Copyright 2014 Keithley Instruments No. 3270 8.5.14
Model 2231A-30-3 specifications
Models 2220 and 2230 specifications
