MAALESYSTEM TIL LOKALISERING AV ET STED LANGS EN ELEKTRISK LEDER HVOR DET ER FOREGAATT EN IMPEDANSEENDRING, SAASOM ET BRUDD ELLER EN KORTSLUTNING

摘要

1517768 Locating faults etc. in cables E RASMUSSEN AS 22 Dec 1976 [24 Dec 1975] 52789/75 Heading H4D A system for locating a point D along a conductor 2 where an impedance change occurs, using a pulse reflection method, comprises a pulse generator 6 producing a series of pulse trains each comprising a series of pulses P of individual (identifiable) durations or widths, preferably of steadily increasing or decreasing widths, and a detector 10 responsive to reception of a reflected pulse front when this coincides substantially with the termination of the individual pulse giving rise to the reflection P R to stop a counter 14 and indicate the distance MD on a display 18, the distance being derived from the particular pulse width identified.