Printed circuit board open circuit tester

Details Printed circuit board open circuit tester Printed circuit board open circuit tester

1976-08-25

1977-11-01

Strecker, Gerard R.

Electricity: measuring and testing

Plural, automatically sequential tests

324 51, G01R 3102

Patent

active

040567737

ABSTRACT:
Open circuits are detected in printed circuit board conductors before components are mounted by means of contacting both sides of the board with flexible conductive test patterns connected to test circuits by decreasing below atmospheric the pressure about said board.
The testing is done by scanning manually isolated circuit positions on one test pattern with an LED panel to signify any broken continuity in the printed circuit board conductors. All circuit leads are tested in parallel. Short circuit tests between the conductors are also tested by the same test array by registering the test circuit pattern with one of opposite conductivity characteristics to cause a continuity when circuit pattern conductor exceeds predetermined limits or bridges the path to another conductor.

REFERENCES:
patent: 2399753 (1946-05-01), McLarn
patent: 3714572 (1973-01-01), Ham et al.
patent: 3723867 (1973-03-01), Canarutto
patent: 3830956 (1974-08-01), Wootton et al.
patent: 3942778 (1976-03-01), Fadiga et al.
De Groat et al., Finding Shorts in Printed Circuit Boards, IBM Tech. Discl. Bull. vol. 12, No. 5, Oct. 1969, pp. 655, 656.
Senger et al., Membrane Contact Array with Photosensitive Interconnections, IBM Tech. Dis. Bull. vol. 14, No. 11, Apr. 1972, p. 3427.
Dodd et al., Printed-Circuit Tester IBM Tech. Dis. Bull. vol. 16, No. 9, Feb. 1974, pp. 2848, 2849.

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