Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1993-06-29
1994-01-11
Nguyen, Vinh
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
165 804, G01R 3102, H01L 2344
Patent
active
052784959
ABSTRACT:
A method for rapidly changing temperatures of either an unpopulated printed circuit board or a completed printed circuit board assembly and testing operation thereof. The rapid temperature change nondestructively stresses the printed circuit board or assembly and uncovers many defects that are hard to discover by constant temperature test methods. Each unit under test is alternately bathed with cold perfluorinated liquid and hot perflourinated liquid to rapidly change it temperature from cold (273 degrees kelvin) to hot (333 degrees kelvin).
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Beaton Bradford P.
Brumble Frederick D.
Rankin Michael C.
Martin Paul W.
NCR Corporation
Nguyen Vinh
Penrod Jack R.
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