Tester calibration verification device

Details Tester calibration verification device Tester calibration verification device

1992-07-31

1993-10-26

Nguyen, Vinh

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

324 731, 368117, 371 151, G01R 3128

Patent

active

052569640

ABSTRACT:
A circuit for verifying the accuracy a tester, for enhancing its calibration and for providing tracking between testers. The circuit includes a delay element, first and second multiplexers connected to the input and output of the delay element, respectively, and a feedback path linking outputs of the second multiplexer to inputs of the first multiplexer to provide an oscillation. The delay between an input of the first multiplexer to an output of the second multiplexer is measured and this delay is compared to the frequency domain measurement of the same to provide an indication of the accuracy of the tester.

REFERENCES:
patent: 3671693 (1972-08-01), Hsueh
patent: 3781670 (1973-12-01), McMahon
patent: 4382105 (1983-07-01), McLeod
patent: 4489272 (1984-12-01), McLeod
patent: 4688947 (1987-08-01), Blaes et al.
patent: 4866685 (1989-09-01), Lee
patent: 5003256 (1991-03-01), Merrill
patent: 5099196 (1992-03-01), Longwell et al.

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