... -phase voltage, frequency in one circuit, each phase current, power, power factor, energy in three circuits, with 3DI+1DO. YD2080- ... -phase voltage, frequency in one circuit, each phase current, power, power factor, energy in four circuits, with 3DI+1DO. YD2080- ... Type of transformer close-type split-type Curent0.5%1% Voltage0.5%0.5% Power, power factor1% 2% Frequency45~60Hz45~60Hz Active energy1% ...