In-service wiring verification circuitry

Details In-service wiring verification circuitry In-service wiring verification circuitry

1997-10-02

2000-01-18

Do, Dep N.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324 66, 324523, 379 25, G01R 3102, H04M 124

Patent

active

060160586

ABSTRACT:
In-service verification/continuity testing apparatus and method for testing the continuity integrity of wiring installed to an in-use operational circuit. The apparatus measures the voltage difference created by injecting two equal but opposite insignificant currents through a test path. A current loop is created by placing an isolated ground, which is referenced to unique detection circuitry provided in the testing apparatus. An accurate voltage differential calculation is accomplished by using a sample and hold circuit in parallel with switching the injected currents. Biasing the detection circuitry using two identical but inverse voltages with a reference to the isolated ground allows the detection circuit to subtract out extraneous currents flowing through the wiring path due to external voltage and current sources.

REFERENCES:
patent: 4130794 (1978-12-01), Cox
patent: 4208553 (1980-06-01), Kaplan
patent: 4652813 (1987-03-01), Bakke et al.
patent: 5309499 (1994-05-01), Webber
patent: 5488307 (1996-01-01), Plott
patent: 5625667 (1997-04-01), Vogt, III et al.
patent: 5764725 (1998-06-01), Martin, Jr. et al.

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