... weight, small size The constant voltage and constant frequency power adopts advanced sinusoidal pulse width modulation (SPWM) IGBT high ... output waveform purity, with large rang of smeter voltage and frequency, high precision, light weight, small size, ... Waveform Distortion: <1% 6. Isolation transformer output, safe and reliable 7. Output overvoltage, overcurrent, overload, overheating, short circuit ...