Precisely and automatically complete power filter amplitude frequency and phase frequency characteristic measurement.Automatically measure power filter by parameters of reactor, capacitor and resistor.Compensate and measure capacitor group unbalanced current 0.01 mA�10 mA Features Quickly and accurately test all parameters of power filter by this single device High precision: field test accuracy can reach 5�. High efficiency: compared to the traditional testing methods it saves much time and labor force. Safe and reliable: using high-frequency low-level signal does not generate dangerous high voltage. Thus no safety issue is in the picture in the field.