... instrument developed by Senter Corporation, its working principle is Time Domain Reflectometer (TDR) and Bridge Methods. It is a very convenient ... and loop.l Automatic Detection: advance and precise, it can find almost all types of faults.l Manual Detection: easy to ... bottom of the LCD, they are FUNC, RANG, VOP, ZOOM, FIND, FILE, LINE, press RANG as Fig. 1.3 shows, then ...