... is a kind of all-purpose tester for testing volt-ampere characteristics, ratio, polarity, demagnetization, checks for primary current, ACTV and so on ... the test result about volt-ampere characteristics curve, ratio and polarity. Data-saving and print also can be operated in this ... : to test the volt-ampere characteristics of CT/PT, ratio, polarity, error curve of 5% ,10%, primary current, ACTV and ...