... communication protocol. Description YD4Z-9SY multifunction electric power meter integrate the functions with programmable measurement, display, ... .2%Frequency40~60Hz, accuracy 0.2HzFunctionActive power, Reactive power, Apparent power, Accuracy: 0.5% classElectric energyFour ... 75ºCSafetyVoltage withstandInput and power>AC 2kV, input and output>AC 2kVInsulationInput, output, power supply to machine hull ...