... 3.wide voltage stabilizing range 4.high efficiency Frequency converter/ac power source Use of stand-alone, ... output isolatedHigh precision voltage/frequency stabilization, knob regulationvoltage/frequencyHigh precision display:Voltage,current, frequency, active power, power factors ... 2msOutput frequency:50Hz/60Hz/45-70Hz/400Hz,load frequency stabilization rate±0.01%Output voltage:0-300V (line voltage ...