Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1978-01-30
1978-10-31
Tokar, M.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 78D, 328134, G01R 2302
Patent
active
041237048
ABSTRACT:
A circuit is provided for monitoring a signal generated by an oscillator and producing a digital display of the sign and magnitude of the deviation of the actual frequency of the oscillator-generated signal from a preselected desired frequency. Alternating sampling and display period pulses are produced in the circuit and, during the period of a sampling pulse, clock pulses are produced at a rate proportional to the actual frequency of the oscillator-generated signal. A plurality of counters in the circuit count the number of clock pulses produced during the period of a sampling pulse and hold the count during the period of a display pulse succeeding the sampling pulse. Read only memory devices sense the count held by the counters and decode the count to drive display units either to display the magnitude and sign of the deviation when it is within a predetermined range or to display an out-of-range indication.
REFERENCES:
patent: 3882303 (1975-05-01), Linder
patent: 3922670 (1975-11-01), Shaw
patent: 3990007 (1976-11-01), Hohhof
Cleaver William E.
Flanagan John R.
Sperry Rand Corporation
Tokar M.
Truex Marshall M.
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