Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location
Patent
1993-01-08
1994-06-14
Wieder, Kenneth A.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
For fault location
324158P, 324540, G01R 3108
Patent
active
053213637
ABSTRACT:
A two-terminal circuit element measuring apparatus of the present invention is capable of distinguishing a loose connection between a DUT and the measuring apparatus from a high impedance in the DUT. The measuring apparatus is also capable of measuring the impedance of the DUT without altering the connections between the DUT and the measuring apparatus. The measuring apparatus applies both DC and AC current signals to the DUT so as to compensate any leakage current occurring within the three-wire cable connecting the DUT and the measuring apparatus. Because of the compensation, when both DC and AC current ammeters indicate substantially zero values, it is assured that a loose connection exists.
REFERENCES:
patent: 4440985 (1984-04-01), Federico et al.
patent: 4795962 (1989-01-01), Yanagawa et al.
patent: 5014012 (1991-05-01), Kuboyama et al.
SMO851-Ultra-high Resistance Tester for Automatic Inspection-TOA Electronics Ltd., five pages, Sep. 1988.
Model 4329A High Resistance Meter-Operating and Service Manual-Aug., 1974, Hewlett Packard.
Model 4328A Milliohmmeter-Operating and Service Manual Jan. 1982, Hewlett Packard.
Kuboyama Yohichi
Nakata Nobuo
Tanaka Hideshi
Wakamatsu Hideki
Hewlett--Packard Company
Tobin Christopher M.
Wieder Kenneth A.
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