Cable break locator

Details Cable break locator Cable break locator

G - Physics

01

R

349/3, 324/58.3

G01R 31/02 (2006.01) G01R 31/08 (2006.01) G01V 1/00 (2006.01)

Patent

CA 1173907

ABSTRACT CABLE BREAK LOCATOR Method and apparatus for determining the location of a break in a pair of wires of a multi-wire cable are disclosed. The apparatus comprises means for shorting one wire of a given pair and all other wires in a cable to ground; an AC current source for connection across the wires of such a given pair to produce an AC voltage across such a given pair; a multiplier for multiplying the voltage produced across such a given pair by a second AC signal, which is in a quadrature phase relationship to the AC current source to form a product signal; and means for comparing the DC component of the product signal to a reference signal, said reference signal having a value which is inversely proportional to the capacitance of an unbroken pair. The comparison means preferably comprises a filter for extracting from the product signal the DC component; an analog-to-digital converter for digitizing the DC component of the product signal; and an arithmetic logic unit for comparing the digitized DC component of the product signal to the reference signal.

388473

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