... industry, computers and labs3) For others which need frequency conversion power supplyTechnical characteristics: Output power500VA200KVACircuit modeIGBT/PWM ... 5%(impedance load)Response time2msRead outputVoltage , Current, Power, Frequency, LED digitalProtections functionOver voltage, over load, over temperature ... :0-90% (no-coagulating) Digital Programmable Variable Frequency AC Power Supply