Environmental stress screening process

Details Environmental stress screening process Environmental stress screening process

1991-10-28

1993-02-16

Nguyen, Vinh

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

324158F, 361385, 165 804, G01R 3102, H01L 2344

Patent

active

051874326

ABSTRACT:
A method that stress assembled circuit boards well beyond normal operational limits both with respect to supply voltages and temperature cycling. The circuit boards are transferred between a cold bath of inert liquid and a hot bath of inert liquid while the power voltages are being applied for short periods of time at voltages which exceed the nominal voltages of the devices. The circuit boards are transferred from the hot bath to the cold bath or vice versa in less than 30 seconds, and maximum stresses are achieved without damaging parts or the circuit boards.

REFERENCES:
patent: 3761808 (1973-09-01), Ryan
patent: 4706208 (1987-11-01), Helms
patent: 4812750 (1989-03-01), Keel et al.
patent: 4854726 (1989-08-01), Lesley et al.
patent: 4949031 (1990-08-01), Szasz et al.
patent: 5004973 (1991-04-01), Taraci et al.
patent: 5039228 (1991-08-01), Chalmers
Certificate of Copyright Registration #TXU476724; Thermodynamic Engineering Inc.; Jun. 20, 1991.
Certificate of Copyright Registration #TXU476689; Thermodynamic Engineering Inc.; Jun. 20, 1991.

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