... portable device consists single phase high precision program controlled power source and single phase reference standard. Main CharactersThe portable ... , AC current, phase between UI, PF, active power, reactive power, apparent power, frequency and etc.It can test 1 ~3 energy meters ... voltage: 220VOutput current range: 0.1A, 1A, 5A, 20A, 100AMax output power: 50VA for voltage output, 100VA for current ...