Contactless test method and system for testing printed circuit b

Details Contactless test method and system for testing printed circuit b Contactless test method and system for testing printed circuit b

1995-04-06

1996-05-14

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

324538, 324639, G01R 3102, H01H 3104

Patent

active

055171109

ABSTRACT:
A method and apparatus are disclosed for testing unpopulated and inactive populated printed circuit boards for manufacturing defects. The method and apparatus do not require electrical contact with the board under test. The method and apparatus include an AC source, which is connected to the stimulator(s). The stimulator(s) radiate an electromagnetic field onto the traces and components on the board under test and this interaction establishes a potential gradient along the traces and components. A sensor array is located adjacent to a stimulator (if only one is used) or between a pair of stimulators (if a dual arrangement is used) and detects the displacement currents flowing from the board under test. The sensors and stimulator(s) do not electrically connect to the board under test, which is positioned between a ground reference plane and a sensor/stimulator unit. By scanning across the entire surface of the board under test, a displacement current signature of the board under test is obtained. Manufacturing defects on the board under test are found by computer analysis of the displacement current signature.

REFERENCES:
patent: 4583042 (1986-04-01), Riemer
patent: 4805627 (1989-02-01), Klingenbeck et al.
patent: 4829238 (1989-05-01), Goulette et al.
patent: 5006788 (1991-04-01), Goulette et al.
patent: 5124660 (1992-06-01), Cilingiroglu
patent: 5218294 (1993-06-01), Soiferman

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