There is a problem that the electronic equipment such as transformer enters noise that interfere with other measurements in the HV lab, for example, partial discharges (30÷400 kHz), maximum attenuation from 30 kHz to 500 kHz, there is possible to get a 40 dB attenuation at least from 110 kHz.

The EMI line filter is able to eliminate the 120Hz or 400 Hz signal which were produced by the Generator. mains frequency is 50 Hz and many tests, including PD, are performed at 50 Hz. When 120 Hz generator and/or 400 Hz generator are being used, it appears a noise at 60 Hz and/or 400 Hz , and in this case it would need to be eliminated. ACSOON provide you the proposal and solutions on noise filter in different situations.