Method and circuit for testing the conductive circuitry of a pri

Details Method and circuit for testing the conductive circuitry of a pri Method and circuit for testing the conductive circuitry of a pri

1991-05-23

1992-12-15

Karlsen, Ernest F.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324158R, 324538, G01R 3102

Patent

active

051720639

ABSTRACT:
The reliability of conductive circuitry of a printed circuit board and particularly the integrity of the conductive barrels of the through-holes is tested by cyclically passing a current through a plurality of interconnected barrels. The current must be sufficient to resistively heat the conductive barrels to a temperature at which the glass epoxy substrate adjacent to each barrel reaches a transition temperature at which the glass epoxy changes state from a solid to a semi-solid. After sufficiently heating the glass epoxy, it is allowed to cool to ambient temperature. This cycle is repeated for a predetermined number of cycles and the resistance of the barrels is measured after each cycle. A measured resistance that exceeds a predetermined value indicates that one or more defects is present in the interconnected barrels.

REFERENCES:
patent: 3859711 (1975-01-01), McKiddy
patent: 4510446 (1985-04-01), Braun et al.
patent: 5006808 (1991-04-01), Watts

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