Used DC Power Supplies for Sale
844 units in stock — Keysight, Agilent, HP, Sorensen, BK Precision, Tektronix, Lambda, and more. Linear and switching bench supplies, programmable system supplies, single and multi-output models. All key outputs verified under load before listing.
105-AMX DC Power Supplies (1 unit)
3M Dynapro DC Power Supplies (1 unit)
3P Pacific Power Products DC Power Supplies (1 unit)
3Y Power Technology DC Power Supplies (1 unit)
ABB / Baldor / Reliance DC Power Supplies (1 unit)
Ablecom DC Power Supplies (1 unit)
Acopian DC Power Supplies (6 units)
Advanced Energy DC Power Supplies (3 units)
Advanced Energy / Artesyn DC Power Supplies (3 units)
Advanced Power Solutions DC Power Supplies (1 unit)
Advantest DC Power Supplies (2 units)
Agilent / HP DC Power Supplies (1 unit)
Agilent / HP / Keysight DC Power Supplies (1 unit)
Agilent / Keysight DC Power Supplies (286 units)
Amada Miyachi / Unitek Miyachi DC Power Supplies (2 units)
Ametek DC Power Supplies (1 unit)
Ametek / Elgar / Power Ten DC Power Supplies (1 unit)
Ametek / Elgar / Sorensen DC Power Supplies (5 units)
Ametek / Xantrex / Sorensen DC Power Supplies (10 units)
Amrel DC Power Supplies (7 units)
Ark Technologies DC Power Supplies (1 unit)
Astec DC Power Supplies (1 unit)
Astrodyne / RO DC Power Supplies (3 units)
Astron DC Power Supplies (5 units)
Ault Korea / Power General DC Power Supplies (5 units)
Autec Power Systems DC Power Supplies (1 unit)
BCP DC Power Supplies (1 unit)
BK Precision DC Power Supplies (30 units)
Beckman DC Power Supplies (1 unit)
Behlman DC Power Supplies (3 units)
Bel Fuse / Power-One DC Power Supplies (7 units)
Bertan Associates DC Power Supplies (3 units)
Burle DC Power Supplies (1 unit)
Burnsco Technologies DC Power Supplies (1 unit)
CVI Melles Griot DC Power Supplies (1 unit)
Carlo Gavazzi DC Power Supplies (1 unit)
Chroma DC Power Supplies (4 units)
Circuit Specialists DC Power Supplies (1 unit)
Converter Concepts Inc. DC Power Supplies (1 unit)
Cosel DC Power Supplies (6 units)
Cosel / Elco DC Power Supplies (1 unit)
Crown DC Power Supplies (1 unit)
Delta DC Power Supplies (8 units)
Delta Elektronika DC Power Supplies (1 unit)
DiCon DC Power Supplies (2 units)
EMI DC Power Supplies (1 unit)
ENI DC Power Supplies (4 units)
EOS Power DC Power Supplies (1 unit)
EPLAX / Vero Technologies DC Power Supplies (1 unit)
Eaton / MTL Instruments DC Power Supplies (1 unit)
Elgar DC Power Supplies (11 units)
Emerson / Artesyn / Astec DC Power Supplies (19 units)
Emerson / Artesyn Technologies DC Power Supplies (1 unit)
Emerson / Astec DC Power Supplies (1 unit)
Emerson / Motorola / Force Computers DC Power Supplies (1 unit)
Etasis DC Power Supplies (1 unit)
Farnell DC Power Supplies (1 unit)
Fokker DC Power Supplies (1 unit)
Fortron / Source DC Power Supplies (1 unit)
GE DC Power Supplies (1 unit)
GE / Bently Nevada DC Power Supplies (2 units)
GE Fanuc DC Power Supplies (1 unit)
GW Instek DC Power Supplies (8 units)
Galil Motion Control DC Power Supplies (1 unit)
Glassman DC Power Supplies (5 units)
Gossen DC Power Supplies (21 units)
Gossen-Metrawatt DC Power Supplies (3 units)
HP DC Power Supplies (1 unit)
HP / Agilent DC Power Supplies (30 units)
HQ Power DC Power Supplies (1 unit)
Hameg DC Power Supplies (1 unit)
Hammond Manufacturing DC Power Supplies (1 unit)
HiTron DC Power Supplies (2 units)
Horiba / PTI DC Power Supplies (2 units)
IDEC DC Power Supplies (1 unit)
ILX Lightwave DC Power Supplies (9 units)
ISO-Tech DC Power Supplies (1 unit)
Inficon DC Power Supplies (1 unit)
Instek DC Power Supplies (3 units)
Instek/GW DC Power Supplies (19 units)
Jasper Electronics DC Power Supplies (1 unit)
Jenaer DC Power Supplies (1 unit)
Kaiser Systems DC Power Supplies (1 unit)
Keithley DC Power Supplies (32 units)
Kenwood DC Power Supplies (4 units)
Kepco DC Power Supplies (33 units)
Keysight DC Power Supplies (3 units)
Keysight / Agilent DC Power Supplies (64 units)
Keysight / Agilent / HP DC Power Supplies (6 units)
Kikusui DC Power Supplies (18 units)
L3 Communications DC Power Supplies (1 unit)
L3Harris DC Power Supplies (1 unit)
Lake Shore DC Power Supplies (2 units)
Lambda DC Power Supplies (2 units)
Lambda / TDK DC Power Supplies (49 units)
Lambda / TDK / EMI DC Power Supplies (16 units)
Pacific Power Products DC Power Supplies (1 unit)
RS DC Power Supplies (1 unit)
RSR Electronics DC Power Supplies (1 unit)
Rockwell / Allen-Bradley DC Power Supplies (3 units)
Rohde & Schwarz DC Power Supplies (4 units)
Schneider Electric / Eurotherm DC Power Supplies (1 unit)
Schneider Electric / Invensys / Foxboro DC Power Supplies (1 unit)
Server Technology DC Power Supplies (1 unit)
Sorensen DC Power Supplies (1 unit)
Sorenson/Xantrex DC Power Supplies (1 unit)
Spectra Diode Labs DC Power Supplies (1 unit)
Stanford Research Systems DC Power Supplies (1 unit)
TET electronics DC Power Supplies (1 unit)
Tektronix DC Power Supplies (1 unit)
VIZ DC Power Supplies (1 unit)
VOLTCRAFT DC Power Supplies (1 unit)
Xantrex DC Power Supplies (2 units)
Zippy Technology/EMACS DC Power Supplies (3 units)
Choosing the Right DC Power Supply for Your Application
DC power supplies split into two functional categories that serve different purposes. Bench supplies — the E3630A triple-output, E3620A dual-output, or a BK Precision 1760 — are manual instruments. You set a voltage with a knob, set a current limit, and use the front panel display to monitor output. They are the right choice for prototyping, circuit debugging, and any work where a person is adjusting and reading the supply by hand. System supplies — the Keysight 66xx series, N5700/N5750 series, Sorensen XG — are rack-mount instruments designed to be controlled by a GPIB or LAN interface from software. They cost more, hold calibration tighter, and offer programmable output readback that makes them necessary for automated test.
DC Power Supply Selection by Application
| Application | Supply type | Recommended models |
|---|---|---|
| Analog circuit / op-amp bench work | Linear, dual/triple output | Keysight E3630A, E3620A |
| Low-noise precision supply (sensors, references) | Linear, single output | Keysight E3610A–E3617A, HP 6114A |
| High current (>10 A, motors, power electronics) | Switching, high current | Keysight 6680A/6681A, Sorensen XG 60-18 |
| High voltage (>100 V, component testing) | Switching or linear HV | Keysight 6614C (60 V), HP 6038A (60 V/10 A) |
| Automated test (GPIB/LAN control) | System supply with remote interface | Keysight 6632B/6634B, N5750A, N5771A |
| General programmable bench supply | Switching, USB/LAN | Keysight E36300 series, BK Precision 9100 series |
What We Verify Before Listing a Used DC Power Supply
Output voltage accuracy and current limiting are the two critical checks on any power supply. We set each output to nominal voltage under a resistive load at 50% and 100% rated current and measure actual output with a calibrated Keysight 34461A DMM. Acceptable is within 1% of set point; anything wider is recalibrated or listed with a condition note. Current limiting is tested by shorting the output through a current shunt and confirming the supply limits at the set current level without tripping protection — a supply that lets current run away under fault is dangerous in a real circuit.
For Keysight 66xx and N5700 system supplies, we also test GPIB response — address recognition, output enable/disable over GPIB, and readback accuracy of both voltage and current. A unit that shows correct output but reports wrong readback values over GPIB is functionally broken for any automated test application even if the output itself is fine.
Frequently Asked Questions
What is the difference between a linear and a switching DC power supply? +
A linear supply uses a transformer and linear pass transistors to regulate output — it is heavy, runs warm, but produces output noise typically below 500 µV RMS, which matters for powering analog circuits, precision sensors, and low-noise amplifiers. A switching supply chops at high frequency (100 kHz+) and filters down to DC; it is lighter and more efficient but produces switching ripple at that frequency and harmonics. For most bench work, the difference is irrelevant. For powering a reference oscillator, a transimpedance amplifier, or any circuit where the power rail noise floor matters, use a linear supply.
What should I check when buying a used Keysight E3630A triple-output power supply? +
The E3630A has three outputs: +6 V/2.5 A, +25 V/1 A, and −25 V/1 A. On used units the most common issue is oxidized output relay contacts on the ±25 V outputs, which causes intermittent or noisy output at low current. The second is a scratchy front panel output voltage adjustment pot — a quick sign of heavy use, fixable with contact cleaner. We run all three outputs under load at 80% rated current for 30 minutes and check output noise with a scope before listing any E3630A.
What are common faults on used Keysight 66xx series system power supplies? +
The 6632B, 6633B, and 6634B are the most common 66xx units on the used market. The main issue we see is output filter capacitor aging — units stored without power for years can have output voltage overshoot on power-on before the regulators settle. We recommend running any used 66xx supply at half load for an hour before putting it into an ATE system. The second issue is GPIB lockup when addressed in certain GPIB daisy chains; this is almost always a firmware quirk, not a hardware fault, and is fixed by a power cycle with the GPIB interface reset.
Can I control an E3600 series power supply over GPIB from LabVIEW or Python? +
The E3620A, E3612A, and most E3600 variants do not have GPIB or USB. They are manual bench supplies only. The 66xx series (6632B, 6641A, etc.) has GPIB as standard. The N5700 and N5750 series has both GPIB and USB, and the newer E36300 series (E36311A, E36312A) has LAN/GPIB/USB. If remote control is a requirement, confirm the specific model number has the interface option before purchasing — within the same model family the options vary significantly.
Do I need a calibrated DC power supply for my test setup? +
It depends on what you are measuring. If you are using the power supply as a stable voltage source and measuring the DUT response with a separate calibrated instrument (DMM, scope, spectrum analyzer), the supply accuracy matters less — even a factory-spec supply is precise enough. If you are relying on the supply's front panel or GPIB readback to measure the voltage applied to the DUT, you need calibration because those readbacks are what you are reporting. We calibrate supply output voltage and current readback as part of our NIST-traceable calibration service for programmable models.
What is the difference between a bench power supply and a system power supply? +
A bench supply (E3630A, E3612A, BK Precision 1760) is designed for manual operation — front panel knobs, a voltage and current display, and basic current limiting. A system supply (Keysight 66xx, N5700 series, Sorensen XG) is designed for rack-mount ATE use — it has GPIB or LAN for remote control, programmable voltage and current with tight regulation, overvoltage and overcurrent protection, and calibrated output readback. System supplies are more expensive and hold calibration longer but offer little advantage for manual bench work where you set a voltage, connect a DUT, and read a meter.
Need a specific voltage, current, or interface?
We source specific models on request. If you need a high-current 66xx series supply, a calibrated E3630A, or a particular N5700 output configuration, contact us and we will check incoming stock and procurement channels.
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