Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location
Patent
1997-09-24
1999-04-13
Do, Diep N.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
For fault location
324522, 324527, 324543, G01R 3108, G01R 3102
Patent
active
058942238
ABSTRACT:
A cable tester is described for low frequency testing of a cable for faults. The tester allows for testing a cable beyond a point where a signal conditioner is installed, minimizing the number of connections which have to be disconnected. A magnetic pickup coil is described for detecting a test signal injected into the cable. A narrow bandpass filter is described for increasing detection of the test signal. The bandpass filter reduces noise so that a high gain amplifier provided for detecting a test signal is not completely saturate by noise. To further increase the accuracy of the cable tester, processing gain is achieved by comparing the signal from the amplifier with at least one reference signal emulating the low frequency input signal injected into the cable. Different processing techniques are described evaluating a detected signal.
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Medelius Pedro J.
Simpson Howard J.
Do Diep N.
The United States of America as represented by the Administrator
Vrioni Beth A.
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