Contact check for remote sensed measurement

Details Contact check for remote sensed measurement Contact check for remote sensed measurement

1997-10-10

1999-12-07

Regan, Maura

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

324538, 324715, 324611, 324537, 324756, 324754, 324421, 324602, 324609, 324696, 324704, 324705, 324713, 324419, G01R 3108

Patent

active

059990023

ABSTRACT:
A contact resistance check circuit and method for verifying that a sufficient electrical connection is established between a source and a sense lead of a Kelvin connection. The circuit includes a microprocessor for driving a transformer that is connected to the source/sense probe (i.e., contact resistance) with an input pulse. The input pulse is altered in relation to the magnitude of the contact resistance to produce a check pulse. A comparator is used to compare the check pulse with a threshold voltage and for generating a fault indication signal. A flip flop then stores the fault indication signal so that the fault indication signal may be monitored by the microprocessor.

REFERENCES:
patent: 4342957 (1982-08-01), Russell
patent: 4876515 (1989-10-01), Ball
patent: 4954782 (1990-09-01), Ball
patent: 5461358 (1995-10-01), Ravas
patent: 5600249 (1997-02-01), Yagi
patent: 5804979 (1998-09-01), Lund

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