Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1977-07-05
1978-12-19
Tokar, M.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
328133, G01R 2314
Patent
active
041307992
ABSTRACT:
A method for providing a continuous binary coded output measurement of an unknown input frequency or pulse rate. The unknown pulse rate is compared against a first known frequency and an output is obtained in binary coded form which is functionally related to the approximate ratio of the unknown pulse rate to the known pulse rate. A second unknown pulse rate equal to the difference between the unknown pulse rate and the ratio times the known pulse rate is generated. The unknown input pulse rate or the second unknown pulse rate is then transferred to a second stage when the ratio is less than one or greater than one respectively. A series of such comparisons are made to obtain an approximate value for the unknown pulse rate to a predetermined resolution.
Apparatus is provided for receiving and continuously providing an output measurement for an unknown input frequency. A clock circuit provides a plurality of known frequencies having a predetermined interrelationship. The interrelationship is determined by the numerical base chosen to represent the unknown frequency. When the selected numerical base is two, a direct binary output is obtained. Logic circuitry is provided for comparing said plurality of known pulse rates with the unknown input pulse rates and successive unknown differential pulse rates generated during preceding comparisons. Output logic circuitry is provided for receiving the output from the comparisons and displaying the output in a binary coded representation.
REFERENCES:
patent: 3911253 (1975-10-01), Torresdal
patent: 3997740 (1976-12-01), Eubank
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