Electricity: measuring and testing – Plural – automatically sequential tests
Patent
1976-03-31
1977-02-22
Rolinec, Rudolph V.
Electricity: measuring and testing
Plural, automatically sequential tests
235153AC, G01R 1512
Patent
active
040094375
ABSTRACT:
The present disclosure describes a device for checking the dc characteristics of electronic nets disposed for example in assemblies utilized in data processing equipment. The operation of the analyzer assumes the presence of one or more controlled impedance nets, as may be achieved through the use of current mode logic configurations. The device which is employed while the circuit under test is in a power-off condition, first determines which type of net is being tested, passes a current of known magnitude through the net, and then compares the actual voltage developed thereacross with expected voltage values falling within a tolerance range. The voltage corresponding to the nominal impedance of the net and the tester current passed therethrough, lies at the center of the range. The analyzer automatically checks all the pins of a monolithic integrated circuit chip in sequence. If the nets associated with all the pins fall within the tolerance ranges, a "good" indication occurs upon test completion. On the other hand, if an out-of-tolerance net is encountered, the testing sequence is interrupted, an error indication is produced, and the pin associated with the "bad" net is identified by the analyzer.
REFERENCES:
patent: 3621387 (1971-11-01), Smith
patent: 3883801 (1975-05-01), Hess
patent: 3924144 (1975-12-01), Hadamard
Burroughs Corporation
Feeney, Jr. Edward J.
Peterson K. R.
Rolinec Rudolph V.
Sunderdick Vincent J.
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