Frequency and frequency error counting in test apparatus

Details Frequency and frequency error counting in test apparatus Frequency and frequency error counting in test apparatus

1980-06-10

1982-08-17

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 79D, G01R 2314

Patent

active

043452060

ABSTRACT:
Test apparatus designed to be coupled to a transmitter including a local oscillator and mixer for reducing the received carrier frequency, a frequency counter for counting the IF cycles, a subtractor for subtracting the counted value from the actual value of the desired frequency, time averaging circuitry for finding the average error in a plurality of counts and display means for displaying the average error. The frequency counter is a gate time counter which normally counts for a one-tenth second period but increases the counting time to one second when the error is reduced below .+-.10 Hertz.

REFERENCES:
patent: 3372339 (1968-03-01), Harrison et al.
patent: 3838338 (1974-09-01), Khoury
patent: 3978403 (1976-08-01), Mansfield
patent: 4063169 (1977-12-01), Palmer
patent: 4074191 (1978-02-01), Jules

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