Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1990-01-31
1992-03-31
Wieder, Kenneth A.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324 731, 324158T, 340653, G01R 3100, G01R 3128
Patent
active
051011522
ABSTRACT:
Disclosed is a system for determining whether semiconductor components are present and properly connected to a printed circuit board. The semi-conductor material between two pins of an integrated circuit forms a lateral NPN transistor, having its base connected directly to the substrate connection pin of the component. A constant voltage source is applied to the lateral transistor collector pin of the component being tested, and allowed to stabilize. A current or voltage source is then connected to the emitter pin of the lateral transistor, typically an adjacent pin, and a current or voltage pulse is applied to this pin. The current on the collector pin is then monitored and if a corresponding current pulse is detected, the emitter and collector pins, as well as the substrate connection pin of the component, are properly connected to the printed circuit board.
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Harwood Vance R.
Keirn Kevin W.
Keller John J.
Peiffer Ronald J.
Hewlett--Packard Company
Nguyen Vinh P.
Wieder Kenneth A.
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