Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1994-08-08
1995-10-24
Wieder, Kenneth A.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
324 731, 3241581, G01R 3128
Patent
active
054613248
ABSTRACT:
A fixture is provided for locating open conditions within circuits and short conditions between adjacent circuits on a flexible substrate having circuits extending along each side, as well as individual circuits extending along both sides. In one station of the fixture, the flexible circuit extends against a conductive backing plate, and conductivity measurements, to detect open conditions, are made between two probes moving among test points on the first side of the substrate, which is opposite the backing plate, and between one of these probes and the conductive backing plate. The latter type of measurement is used particularly to detect an open condition in a via extending through the substrate. In another station of the fixture, the first side of the flexible circuit extends against a conductive backing plate having an insulating sheet adjacent to the substrate, conductivity measurements, to detect open conditions, are made between two test probes moving along a side of the substrate opposite this insulated conductive backing plate, and capacitance measurements, to detect short circuit conditions, are made between one of these probes and the insulated conductive backing plate.
REFERENCES:
patent: 5166607 (1992-11-01), Long
IBM Technical Disclosure vol. 14 No. 12 May 1972 P. T. Flynn, "Automatic Printed Circuit and Plated Thru Hole Tester".
Boyette James E.
Fleck Christopher M.
Mahlbacher James C.
Servedio Michael
Davidge Ronald V.
International Business Machines - Corporation
Magistrale Anthony N.
Wardas Mark
Wieder Kenneth A.
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