Method and apparatus for capacitance testing printed circuit boa

Details Method and apparatus for capacitance testing printed circuit boa Method and apparatus for capacitance testing printed circuit boa

1978-11-24

1980-10-21

Tokar, Michael J.

Electricity: measuring and testing

Plural, automatically sequential tests

324158F, G01R 1512

Patent

active

042296935

ABSTRACT:
This relates to a method and apparatus for testing printed circuit boards. The printed circuit board to be tested is placed on a metal plate and covered with a thin plastic film. The plastic film is coupled to the metal plate to form a substantially air-tight chamber occupied by the printed circuit board. A vacuum is then created in the chamber to secure the printed circuit board. A capacitance meter has a first terminal coupled to the metal plate and a second terminal coupled to a probe which is used to puncture the plastic film to make contact with electrical interconnects on the board.

REFERENCES:
patent: 2301106 (1942-11-01), Brown
patent: 4012693 (1977-03-01), Sullivan
H. Bohlen, Workpiece Holder, IBM Technical Disclosure Bulletin, vol. 20, No. 1, Jun. 1977 pp. 228, 229.
B. Ventimiglia, Vacuum Chuck, IBM Technical Disclosure Bulletin, vol. 10, No. 11, Apr. 1968, p. 1759.

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