For pin-pointing of faults in buried cables the acoustic method is used to pin-point the exact fault location. The surge generator =is used in repetitive pulsing mode. High energy pulses which are released from the Surge Generator force a voltage pulse to travel along the cable. At the fault the flashover happens. This causes a high acoustic signal that is locally audible. Depending on the pulse energy, the intensity of the acoustic signal varies. These noises are detected on the ground surface with the addition of the S.D.A.D II.