Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location
Patent
1992-06-01
1993-10-26
Wieder, Kenneth A.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
For fault location
324158R, 324679, 324672, 324 66, 371 251, G01R 3102
Patent
active
052569756
ABSTRACT:
A hand-held test probe is employed which uses a capacitance measuring circuit to measure capacitance as the probe is scanned along a pattern of conductors (pads or pins) at a steady rate. The capacitance measurement is stored in a memory during the scan, then maximums are detected in the stored data, corresponding to the conductor pattern. If a particular conductor has a short or a break in continuity, its capacitance will be more or less than it should be. The detected maximums are compared with recorded values for a known-good printed wiring board for this scan pattern. If the comparison shows a difference greater than a selected threshold, an error is indicated for this pin location. The known-good is scanned in a "learn" mode, in which the capacitance values are stored for each scan, identified by scan number.
REFERENCES:
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patent: 4791357 (1988-12-01), Hyduke
patent: 5138266 (1992-08-01), Stearns
Mellitz Richard I.
Stearns Ellsworth W.
Digital Equipment Corporation
Solis Jose M.
Wieder Kenneth A.
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