... tested waveform according to criterion of settings (Area, Differential Area, Corona Discharge, Differential Phase etc. ), then judges if the coil winding ... judged according to set criterion (area, area difference, phase difference, corona)TH2882AS-5 is mainly used to measure three-phase 3 ... is applied, the poor insulation will appear as a corona or layer discharge. Impulse Winding Tester TH2882A-5