... portable device consists single phase high precision program controlled power source and single phase reference standard. Main CharactersThe portable device consists ... , reactive power, apparent power, frequency and etc.It can test 1 ~3 energy meters at the same time, the error processor ... fineness can be selected: 10%, 1%, 0.1%, and 0.01%; For the phase angle, 10 º, 1 º, 0.1 º and 0.01 º for option ...