... current ratio 4 DDSJ single phase electronic watt-hour meter,power meter,energy meter1.Single phase electronic watt-hour ... voltage0.7n~1.3UNVoltage consumptionactive power≤1.0W,apparent power ≤6VACurrent consumptionactive power≤1.0VA3.2 Environmental RequirementsNormal ... positive direction.Adopt photoelectric isolated technology,which output pulse signal, power supply will be can instructed by light ...