The acoustic locator KAMPHONE N is designed as a pinpointer to locate flash-over faults in underground cable networks of various voltage levels accurately. It effectively measures the flash over noise and magnetic field that develop during the discharge of a fault in the ground. The flash discharge is usually generated by a suitable surge voltage generator. The point of min. time difference of both signals will indicate the precise location of the fault. Advanced evaluation features such as coincidence and time difference modes plus various background noise filter settings improve the location procedure substantially.