Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1991-11-21
1995-05-30
Harvey, Jack B.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
324 66, G01R 3102, G01R 1900
Patent
active
054205123
ABSTRACT:
A cable testing system includes a far end unit for alternately connecting the wire ends at the remote end of a cable with either a resistive load including a plurality of resistors connected with the wires, respectively, or a source of a-c signals of different frequencies supplied to the lines, respectively. A near end unit connected with the ends of the wires at the adjacent end of the cable is operable during the resistive mode of operation of the far end unit to measure open-circuit and short-circuit conditions of the wires. During the frequency signal mode of operation, crossover between wires is mapped by the use of a differential amplifier, a full-wave rectifier an a slope detector circuit, to provide pulse width, cycle length and slope data for identifying the various wires.
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Burch William D.
Sala Steven B.
Spillane Philip E.
Harvey Jack B.
Paladin Corporation
Regan Maura K.
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