Electricity: measuring and testing – Plural – automatically sequential tests
Patent
1987-02-12
1989-05-02
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Plural, automatically sequential tests
324158R, 324 73AT, 371 20, 371 25, G01R 1512
Patent
active
048272086
ABSTRACT:
In circuit testers, notably automatic test equipment for the in circuit testing of digital devices, overheating damage can result if outputs are repeatedly "overdriven", that is, while applying a test input to a first device, an output of a second connected device is forced into a state contrary to that it would normally adopt. Damage is avoided by enforcing a cooling interval between overdriving tests based upon a list of parameters representative of the overdriven device and its environment. In order to reduce the overall test time, a parameter is based on a measurement derived from a circuit of the type under test. A first test results in device heating to a value. A cooling interval is enforced so that a subsequent test which results in further heating of the device, may be made without exceeding device maximum allowable temperature .sup.T max.
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Boote Stephen R.
Brazier Kevin E.
Oliver Martin J.
Eisenzopf Reinhard J.
Membrain Limited
Nguyen Vinh P.
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