... adjust the voltage and frequency. 2.High precision, screen digital display: frequency, voltage, current, power, power factor. 3. ... regulating voltage response for 100% load/ unload in 2ms. 4.Output frequency: 50Hz, 60Hz, 47 ~ 63Hz (can be ... circuit Over current detection Output current display Output voltage display Output frequyency display Over Temperaturedetection Over voltage detection Fuse ...