The PWM amp system provides highly-stable output, 5kV/100mA (500VA) AC Hipot (withstanding voltage) test, 25V-1000V (7 steps), 500V or greater, up to 5.00GΩ Insulation Resistance test, High-precision measurement ±1.5% of reading (with voltmeter 500V or higher, Ammeter 1mA or higher), Rise time/Fall time control, Key lock function and Protection cover for key operation, Equipped with USB interface