Period and frequency measuring instrument

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage

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Details

324 78D, 324 79D, 377 52, G01R 2302

Patent

active

045448841

ABSTRACT:
A device for determining with high accuracy the period and frequency of an input signal by taking into account the fractions of a clock signal that are normally ignored. A gate signal with an integral number of clock pulses is generated. Each fractional time is accurately measured by first and second integrators, and an up-down counter provides the difference between the fractional times for the final determination.

REFERENCES:
patent: 4150432 (1979-04-01), Sorden
patent: 4216463 (1980-08-01), Backof
patent: 4257003 (1981-03-01), Yool
patent: 4301405 (1981-11-01), Carlson
patent: 4310800 (1982-01-01), Baker
patent: 4330746 (1982-05-01), Stulting
patent: 4350950 (1982-09-01), Waldmann
patent: 4456876 (1984-06-01), Haymaker

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