Electronic integration of the de-noised PD signal to measure the charge of the captured PD pulses.
Typical oscilloscopic records gained in an industrial PD test field are shown in Fig. 4.46. The screenshot displayed in Fig. 4.46 a, b reveal that under practical condition the signal-to-noise ratio can substantially be enhanced if the abovedescribed non-conventional concept is adopted. In this context, it should be mentioned that the above-described concept was also beneficial employed for a hand-held, battery-powered PD probe to enhance the signal-to-noise ratio required for PD diagnostics of HV apparatus under on-site condition (Lemke 1985, 1988,1991)