AC Power Sources

AC power sources are programmable instruments that synthesize precise alternating current power with independently controllable voltage, frequency, waveform shape, and phase, independent of the local utility supply. Unlike passive line conditioners or variacs, they generate output from an internal power stage, enabling engineers to reproduce any AC mains condition — including non-standard frequencies (50 Hz, 60 Hz, 400 Hz), voltage variations, sags, surges, and harmonic distortion — with high accuracy and cycle-by-cycle repeatability. Combined AC+DC output models further support DC offset injection for avionics and military power quality testing per MIL-STD-704 and DO-160.

These sources are central to electrical safety testing, EMC pre-compliance, power supply design validation, and obtaining international market certifications under IEC, UL, CE, and automotive standards. AMETEK California Instruments, Pacific Power Source, and Associated Research are the most widely deployed platforms across laboratory, production-line, and field test environments. Variable transformer modules are also available in this category for applications requiring basic voltage variation without full waveform synthesis.

Typical Applications

AC mains simulation at 50 Hz, 60 Hz, and 400 Hz for international compliance and avionics certification testing
Voltage dip, surge, and interruption testing per IEC 61000-4-11 and DO-160
Electrical safety and dielectric withstand (hipot) testing of consumer and industrial products
Power supply and UPS input characterization across extreme voltage and frequency ranges
Harmonic injection and power quality testing of grid-connected inverters and equipment
Automotive ECU and infotainment system power testing per LV 123 and ISO 16750

Popular Brands

AMETEK California Instruments is a leading manufacturer with programmable AC and AC+DC sources covering single- and three-phase outputs from bench-top to hundreds of kVA. Pacific Power Source supplies high-power three-phase AC systems for aerospace and industrial testing. Associated Research specializes in electrical safety testers with integrated AC source capability, while Chroma ATE and NH Research serve production-line ATE markets requiring automated multi-DUT test systems.