Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1977-04-08
1978-09-05
Tokar, M.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 77R, 324 79D, G01R 2302
Patent
active
041123581
ABSTRACT:
A digital frequency measuring device in which pulses of an input signal are counted for a certain period of time under the control of a gate signal and the count value is displayed in a digital form. A fraction detector circuit is provided for measuring the time interval or difference .DELTA.T.sub.1 between the leading edge of the gate signal and an input pulse arriving after it, the time interval or difference .DELTA.T.sub.2 between the trailing edge of the gate signal and an input pulse arriving after it and the unit period T of the input pulse signal, and performing an operation corresponding to (.DELTA.T.sub.1 - .DELTA.T.sub.2 /T. The result of operation is converted into the corresponding digital value, which is displayed as a fraction value of the abovesaid count value.
REFERENCES:
patent: 3638001 (1972-01-01), Gordon
patent: 3729677 (1973-04-01), Band
Takeda Riken Kogyo Kabushikikaisha
Tokar M.
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