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The Keithley 2231A-30-3 is a 195W triple channel DC power supply built around a linear regulation design. It provides two independently programmable 0–30V/3A outputs and a third 0–5V/3A output in a single benchtop enclosure, with all three channels electrically isolated from each other and from chassis ground.
Keithley positions this supply for engineering and science student labs, service work, and electronic design. The three independent outputs let one instrument power the analog and digital sections of a printed circuit board simultaneously, support circuits referenced to different grounds (including transformer-isolated and optically isolated designs), and — by tying high and low terminals of two channels to a common reference point — supply bipolar circuits with positive and negative rails that can be varied together using the tracking function.
Keithley Instruments was founded in 1946 in Cleveland, Ohio. The company was acquired by Danaher Corporation in 2010, and in 2016 Danaher's test and measurement businesses — including Keithley and Tektronix — were spun off as Fortive Corporation. Keithley continues to operate as a Tektronix Company under Fortive, and the 2231A-30-3 datasheet carries both the Keithley and Tektronix Company markings.
| Specification | Value |
|---|---|
| DC Output Rating | |
| Channel 1 Voltage | 0–30 V |
| Channel 1 Current | 0–3 A |
| Channel 2 Voltage | 0–30 V |
| Channel 2 Current | 0–3 A |
| Channel 3 Voltage | 0–5 V |
| Channel 3 Current | 0–3 A |
| Maximum Power | 195 W |
| Load Regulation | |
| Voltage | ≤0.02% + 4 mV |
| Current | ≤0.2% + 3 mA |
| Line Regulation | |
| Voltage | ≤0.02% + 4 mV |
| Current | ≤0.2% + 3 mA |
| Ripple and Noise (20 Hz–20 MHz) | |
| Voltage | ≤1 mVrms / ≤5 mVp-p |
| Current | ≤6 mArms |
| Setting Resolution | |
| Voltage | 10 mV |
| Current | 1 mA |
| Setting Accuracy | |
| Voltage | ≤0.06% + 20 mV |
| Current | ≤0.2% + 10 mA |
| Readback Resolution | |
| Voltage | 10 mV |
| Current | 1 mA |
| Readback Accuracy | |
| Voltage | ≤0.06% + 20 mV |
| Current | ≤0.2% + 10 mA |
| Isolation Voltage, Output to Chassis | Any output can be isolated up to 240 V (DC + peak AC with AC limited to a maximum of 3 Vpk-pk and a maximum of 60 Hz) relative to the earth ground terminal. |
| Isolation Voltage, Output to Output | Any output can be isolated up to 240 V (DC + peak AC with AC limited to a maximum of 3 Vpk-pk and a maximum of 60 Hz) relative to any other output terminal. |
| Tracking and Combination Modes | |
| Tracking Mode | Maintains the ratio on the two 30 V 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 + I2 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 | 0.1 s to 99999.9 s |
| Display | Vacuum fluorescent display |
| Front Connections | Power output jacks: 3-sets, safety-shrouded banana jacks |
| Rear Connections | 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 | 110 VAC / 230 VAC ±10% |
| Power Line Frequency | 47 Hz–63 Hz |
| Maximum Power Consumption | 750 VA |
| Operating Environment | 0° to 40°C, 5% to 80% relative 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 |
| Height | 88.2 mm (3.5 in) |
| Width | 214.5 mm (8.5 in) |
| Depth | 354.6 mm (14 in) |
| Net Weight | 7.10 kg (15.7 lbs) |
| Shipping Weight | 9.40 kg (20.7 lbs) |
| Warranty | 3 years |
Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.
Model No
Keithley
Condition
New
Manufacturer
Keithley
Current
3 A
Voltage
30 V
Power
195 W
5Y-EW
3 year factory warranty extended to 5 years from date of shipment
EW
3 year factory warranty extended to 4 years from date of shipment
T3
Three Year Total Protection Plan , includes repair or replacement coverage from wear and tear , accidental damage , ESD or EOS plus preventative maintenance.
T5
Five Year Total Protection Plan , includes repair or replacement coverage from wear and tear , accidental damage , ESD or EOS plus preventative maintenance.
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On-site Lab
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