... frequency method;-Test CT/PT Turns ratio, Polarity, ratio error & phase angle error by voltage method.-Can be used at CT/PT ... following CT parameters automatically: ²Knee point voltage/current, 10% (5%) error curve , ²ALF (accuracy limiting factor), FS (instrument security factor), ² ... , secondary winding resistance-6.4 inch real color TFT, DSP, Linux OS -3000 groups of test data storage, the data can ...