... characters tester the tester is a kind of all-purpose tester for testing volt-ampere characteristics, ratio, polarity, demagnetization, checks ... -600A. Step-up, increasing current, drawing the volt-ampere characteristics curve, and calculating ratio are full automatic. It ... Complete-function: to test the volt-ampere characteristics of CT/PT, ratio, polarity, error curve of 5% ,10%, primary current, ACTV ...