Device for measuring small frequency differencies

Details Device for measuring small frequency differencies Device for measuring small frequency differencies

1976-01-07

1977-01-04

Segal, Robert

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

328133, 324 83FE, G01R 2302

Patent

active

040016803

ABSTRACT:
A device for measuring small frequency differencies includes a phase detector followed by a differentiating circuit. In order to linearize the output from the differentiating circuit the time constant thereof is decreased during the fly back time of the saw-tooth wave delivered by the phase detector and the phase of one of the frequencies is shifted 180.degree. as soon as the saw-tooth approaches the generally non-linear end portion.

REFERENCES:
patent: 3233180 (1966-02-01), Eddy
patent: 3515997 (1970-06-01), Babany
patent: 3519929 (1970-07-01), Ault

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