ISO/IEC 17025 Accredited · Trusted by Engineers Worldwide · Serving 11 Industries
+1 530-268-1860 contact@microprecision.com
ISO/IEC 17025 Accredited · Trusted by Engineers Worldwide · Serving 11 Industries
+1 530-268-1860 contact@microprecision.com
Reviewed by the Micro Precision Technical Team · Last updated: May 2026
DC power supplies convert AC mains power into stable, regulated DC output — the controlled voltage and current source required for electronics testing, circuit validation, and R&D applications. Micro Precision Test Equipment stocks new and certified-used bench DC power supplies, programmable DC power supplies, modular DC power modules, and high-power DC systems from Keysight and GW Instek. Every unit ships fully inspected and calibrated from our ISO/IEC 17025 accredited facility.
Image | Brand | Name | Description | Price |
|---|---|---|---|---|
 | GW Instek | GW Instek GPS 3030 DC Power Supply offers 30V/3A output, dual LED display, and precision CV/CC modes for lab and industrial use. | $95.00 | |
 | Keysight | Keysight E3610A Power Supply with 30W output, 0-8V and 0-3A range, ±0.5% voltage accuracy, and built-in overvoltage and overcurrent protection for reliable performance. | $150.00 | |
 | Keysight | Keysight E3615A Power Supply with 15V, 1.5A output, precise voltage and current regulation, and built-in overvoltage and overcurrent protection for reliable operation. | $150.00 | |
| | Keysight | Keysight E3616A Power Supply offers 35V, 1.7A, and 60W output with high accuracy, advanced protection features, and USB/GPIB connectivity for reliable power delivery in electronic projects. | $150.00 | |
| | GW Instek | GW Instek GPS 3030D DC Power Supply provides 0–30V, 0–3A, 90W output with overload protection, perfect for lab and electronics testing. | $195.00 | |
| | GW Instek | GW Instek GPS 3030DD DC Power Supply offers 0–30V, 3A, 90W output with overload protection, ideal for research and laboratory use. | $195.00 | |
 | GW Instek | GW Instek GPS-3303 Triple Output DC Power Supply offers 0–30V, 3A, and 5V, 3A outputs, ideal for multiple device testing in labs. | $195.00 | |
 | Keysight | Keysight 6227B Dual DC Power Supply, 400W total. Precision, safety & dual outputs make it ideal for lab and test use. | $225.00 | |
 | Keysight | Keysight 6627A DC Power Supply offers dual-range output, GPIB/RS-232, and low ripple. Trusted precision for lab and system use. | $495.00 | |
 | Keysight | Keysight 6632B DC Power Supply, 0–20V/5A, 100W. Compact, precise, and protected—ideal for testing and development needs. | $495.00 |
Not all DC power supplies are built for the same application. Understanding each type helps you select the right unit for your bench, ATE rack, or production floor.
Compact, standalone units built for day-to-day laboratory testing and electronics development. Bench supplies typically cover 0–30V and 0–5A with front-panel knobs for manual CV/CC adjustment. They deliver low-noise linear regulation ideal for circuit prototyping, component characterization, and PCB bring-up. The GW Instek GPS-3030 series and Keysight E361x series represent this category — accurate, affordable, and ready to use out of the box.
Programmable supplies add a remote digital interface — GPIB (IEEE 488.2), USB, LAN (LXI), or RS-232 — allowing automated control of voltage, current, and output sequences from a test computer or ATE controller. They support SCPI command sets for compatibility with LabVIEW, MATLAB, and Keysight PathWave. Essential for production burn-in, parametric sweep testing, and any workflow requiring repeatable software-driven conditions without manual intervention between test steps.
Modular supplies install individual power modules into a shared mainframe — the Keysight N6700 series being the industry standard. Each slot accepts a different module, allowing engineers to configure voltage range, current capacity, and channel count per application, then reconfigure as projects change. Modular systems offer the highest power density per rack unit and are preferred in multi-channel ATE environments where per-channel cost and cable management both matter.
High-power DC supplies deliver 1kW to 15kW or more for industrial manufacturing test, EV powertrain characterization, battery formation, and motor drive testing. The Keysight N8952A (200V / 210A / 15,000W) exemplifies this class — autoranging output, 400VAC three-phase input, and bidirectional power flow for regenerative test applications. These units are rack-mounted, rated for 24/7 duty cycles, and controlled via LAN or GPIB within automated test systems.
AC (alternating current) power reverses polarity at the mains frequency — 60Hz in North America, 50Hz in Europe. DC (direct current) flows in one constant direction and is what virtually all electronic devices, circuits, batteries, and motors require to operate.
A DC power supply takes incoming AC mains power and converts it to a stable, regulated DC output through a rectifier and filter stage (linear designs) or a high-frequency switching circuit (SMPS designs). Output voltage and current are set by the operator via front-panel controls or a remote digital interface such as GPIB or LAN.
In test and measurement environments, a DC power supply is the standard instrument for powering a device under test (DUT). AC sources are a separate instrument class used specifically for simulating mains conditions, testing power factor correction, and evaluating equipment immunity to AC line variations — a different application entirely.
| AC Power | DC Power Supply | |
|---|---|---|
| Current Direction | Alternating (50/60Hz) | Constant, one direction |
| Primary Use | Utility power distribution | Powering electronic devices and DUTs |
| T&M Instrument | AC Source / Power Analyzer | DC Power Supply |
| Output Control | Fixed mains voltage | Adjustable voltage and current |
Choosing between a linear and switching DC power supply depends on your application's noise tolerance and efficiency requirements. Both convert AC mains to regulated DC output — but they do it differently, with meaningful trade-offs for lab and production environments.
Best for: Sensitive analog circuits, RF testing, audio equipment, and precision measurement applications.
Best for: ATE racks, manufacturing production test, high-power applications, and general-purpose digital circuits.
| Feature | Linear DC Power Supply | Switching DC Power Supply |
|---|---|---|
| Output Noise | <1mV RMS | 10–50mV RMS |
| Efficiency | 30–60% | 80–95% |
| Size & Weight | Large, heavy | Compact, lightweight |
| Heat Output | High | Low |
| EMI Generated | Minimal | Higher (high-frequency) |
| Typical Cost | Higher per watt | Lower per watt |
| Best Application | Analog, RF, audio, precision calibration | ATE, production test, high-power systems |
Our recommendation: For bench laboratory and R&D applications where measurement accuracy matters, choose a linear DC power supply. For automated test equipment racks, manufacturing floor fixtures, and applications requiring more than 300W of continuous output, a switching supply delivers better efficiency and lower operating cost. Not sure which fits your application? Request a technical consultation — our engineers will specify the right unit for your requirements.
| Specifications | Keysight E3615A | Keysight N6753A | Keysight N7951A | Keysight N8952A |
|---|---|---|---|---|
| Max Power Output | 60W | 300W | 1000W | 15,000W |
| Voltage / Current | 15V / 1.5A | 20V / 50A | 20V / 50A | 200V / 210A |
| Primary Application | Precision R&D & Benchtop Testing | Modular ATE System Integration | Dynamic Signal & Transient Analysis | High-Power Industrial Manufacturing |
| Key Performance Features | Low Noise Ripple ≤1mV for sensitive circuits | Autorange High-performance modular flexibility | APS Technology Fast transient response & dynamic loading | High Power Density 15kW in a compact industrial footprint |
| Technical Specs | Compact design, intuitive front panel control | N6700 Mainframe compatible, fast processing | Advanced measurement system with data logging | Master/Slave parallel capability for higher power |
Not all DC power supplies perform the same under real test conditions. Before selecting a unit, evaluate these five parameters against your specific application to avoid under-specifying your bench or production setup.
Not sure which DC power supply fits your application? Our engineers will evaluate your voltage, current, and interface requirements and recommend the right unit from our certified inventory.
REQUEST A CONSULTATIONA DC power supply delivers current in a single, constant direction — unlike AC power, which reverses direction at the mains frequency (50 or 60Hz). To identify one, look for the DC symbol (⎓) on the output terminals or product label. Bench power supplies with adjustable voltage
and current knobs are almost always DC. If the output terminals are labeled (+) and (−), it is a DC supply. You can verify with a multimeter set to DC voltage mode — a stable positive reading confirms DC output.
No. DC voltage can range from millivolts to thousands of volts depending on the application. Consumer electronics commonly use 5V, 12V, or 24V DC, but laboratory DC power supplies are adjustable across a much wider range — typically 0–30V for bench models and up to 200V or higher for high-power system supplies. The Keysight N8952A, for example, delivers up to 200V at 210A. The voltage is set by the engineer or test application, not fixed by the nature of DC power itself.
Yes. Precision DC power supplies are routinely used as voltage and current sources during calibration procedures, establishing known stable reference conditions against which a device under test (DUT) is evaluated. Micro Precision Test Equipment is ISO/IEC 17025 accredited through Micro Precision Calibration, Inc., meaning all instruments are traceable to NIST standards. If you require a supply to be calibrated before use, we offer calibration services alongside our test equipment inventory.
Linear DC power supplies use a transformer and linear regulator, producing ultra-low output noise (under 1mV RMS) at the cost of lower efficiency (30–60%). They are preferred for sensitive analog, RF, and precision measurement work. Switching DC power supplies use a high-frequency switching circuit for 80–95% efficiency and a smaller footprint, making them better suited to production test, ATE racks, and high-power applications where some output ripple (10–50mV) is acceptable. For most bench lab use, a linear supply provides the cleanest, most stable performance.
Choose a single-channel supply when powering one circuit or device under test at a time, or when you need the full output range on a single rail. Choose a multi-channel supply — dual, triple, or quad output — when your DUT requires multiple independent voltage rails simultaneously. Many mixed-signal ICs require separate analog (±15V) and digital (3.3V or 5V) rails. A triple-output supply like the GW Instek GPS-3303 handles both rails plus a fixed reference in one instrument, reducing bench clutter and cable management complexity.
A programmable DC power supply allows remote, automated control of voltage, current, and output state through a digital interface — typically GPIB (IEEE 488.2), USB, LAN (LXI), or RS-232. Engineers use them in automated test equipment (ATE) systems where software sequences multiple test conditions without manual adjustment. Programmable supplies support SCPI command sets, enabling integration with LabVIEW, MATLAB, and Keysight PathWave. The Keysight N7951A and N6753A in our catalog support full SCPI programming and high-speed output transient simulation.
A non-programmable supply has front-panel knobs or buttons for setting output — fast for one-off bench tests, but not suitable for automated sequences. A programmable supply adds a digital communication interface (GPIB, USB, or LAN), allowing a computer to set, sweep, and log output parameters automatically. Programmable supplies also typically offer higher output accuracy, faster transient response, and data logging capabilities. For any application involving repeated test cycles, parametric sweeps, or ATE system integration, a programmable supply eliminates human error and saves significant test time.
To use an adjustable DC power supply: (1) Set voltage and current limits before connecting your load — use the voltage knob for desired output and the current knob to set a safe limit. (2) Connect your load to the output
terminals, observing polarity (+/−). (3) Enable the output and check the meters — the supply should hold your set voltage. If it switches to CC mode, the load is drawing more than the set limit. (4) For sensitive devices, enable the output before connecting the load, or use a soft-start ramp if supported. Set the current limit 10–20% above expected draw.
Adjustable DC power supplies are used wherever a precise, controllable voltage or current source is required: circuit prototyping and debugging, incoming inspection of electronic assemblies, battery charge and discharge cycling, LED driver testing, motor and actuator characterization, and calibration of voltage and current measurement instruments. In manufacturing, adjustable supplies power functional test fixtures on assembly lines. In R&D labs, they simulate battery behavior, emulate power rail conditions, and stress-test designs beyond nominal operating voltage to identify failure modes before production.
Our engineers will evaluate your voltage, current, interface, and application requirements and recommend the right unit from our certified inventory — new, refurbished, or rental.
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