... 8 segments output control DW series Single phase Electric Meter(vol/ampere/power/frequency/power factor) Features: 1) Input: ... parameters,such as voltage/ampere/power/power factor/frequency/electrical degree/reactive power/power frequency.2) Accuracy:0.2 ... automatical control of power system,factory power distribution,building automation,eg.,single/three phase,voltage/current/power,three phase voltage ...