The Chroma 6490 is a 9000 VA, single or three phase AC Power Source. The Chroma 6400 Series AC Power Source delivers the maximum rated power for the output voltage up to 300 Vac, and the frequency between 15Hz to 2000Hz. It is suitable for commercial applications (47-63Hz) such as avionics, marine, and military applications at 400Hz or higher frequency; or for electrical motor, air conditioner test applications at 20Hz. All models generate very clean sine or square waveforms output with typical distortion less than 0.5%.