Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1981-01-05
1983-02-15
Tokar, Michael J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 79R, 324 77B, G01R 2302
Patent
active
043743587
ABSTRACT:
The apparatus of the present invention is provided with a reference oscillator having an oscillation frequency lower than the oscillation frequency of a voltage controlled oscillator to be measured. Either reference oscillator or the oscillator to be measured is controlled by a phase lock loop so that a difference between a frequency N times the oscillation frequency of the reference oscillator and the oscillation frequency of the voltage controlled oscillator may assume a predetermined value. A coarse oscillation frequency of the voltage controlled oscillator is obtained from its control voltage. The oscillation frequency of the reference oscillator is counted by a counter and the coarse frequency is divided by the count value and then an integer value is obtained by rounding off the divided result. The count value of the counter is multiplied by the divided result to obtain a highly accurate oscillation frequency value for the voltage controlled oscillator with high accuracy.
REFERENCES:
patent: 3978403 (1976-08-01), Mansfield
patent: 4151463 (1979-04-01), Kibler
Takeda Riken Kogyo Kabushiki Kaisha
Tokar Michael J.
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