... High load and frequency stability6) ±1 waveform low distortion 7) V, A, W, Hz display accurately, digital, simultaneously8) With full protections (over voltage ... load)Response time2msRead outputVoltage , Current, Power, Frequency, LED digitalProtections functionOver voltage, over load, over temperature Short, over ... :0-90% (no-coagulating) Digital Programmable Variable Frequency AC Power Supply