Average frequency measuring apparatus

Details Average frequency measuring apparatus Average frequency measuring apparatus

1982-05-14

1984-08-28

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 82, G01R 2310

Patent

active

044686145

ABSTRACT:
An average frequency measuring apparatus in which auxiliary gate signals are converted into synchronized gate signals synchronized with either input signals or clock signals; first and second gates are opened by the synchronized gate signals; the input signals and the clock signals having passed through the first and second gates are counted by first and second counters, respectively; and the frequency of the input signals is calculated from the count values of the first and second counters for a plurality of occurrences of the synchronized gate signal. A third counter is provided for counting the number of the synchronized gate signals, and a minimum counting time is calculated by calculating means from the count values of the third and second counters and the set measurement accuracy. When it is detected from the count value of the second or third counter that the actual counting time has been exceeded, measurement is stopped, thereby obtaining measured results of accuracy at least higher than the set measurement accuracy.

REFERENCES:
patent: 3609326 (1971-09-01), Bagley et al.
patent: 4142177 (1979-02-01), Davis
patent: 4310891 (1982-01-01), Niki

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