Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1983-08-02
1986-05-06
Levy, Stewart J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 79D, 328140, G01R 2302
Patent
active
045874824
ABSTRACT:
The present invention relates to a digital frequency meter for measuring radiation comprising a first up/down counter which algebrically integrates frequency differences between pulses to-be-measured and feedback pulses derived from a clock generator, a second up/down counter which is connected in cascade to the first up/down counter, an arithmetic circuit which provides as its output a value proportional to an output of the second up/down counter, and a frequency generator circuit which generates the feedback pulses at a frequency proportional to the output of the arithmetic circuit, all the above constituents forming a closed loop, so that in measuring a frequency of the pulses to-be-measured from an equilibrium point of the closed loop, the output of the arithmetic circuit is rendered proportional to an input thereof, whereby a product between the frequency of the pulses to-be-measured and a time constant of the frequency meter becomes constant.
REFERENCES:
patent: 2951202 (1960-08-01), Gordon
patent: 3578960 (1971-05-01), Georgi
patent: 4020418 (1977-04-01), Burrage
patent: 4414678 (1983-11-01), Baumgartner
"Microcomputer Applications in Nuclear Power Plants", subtitled Radiation Monitoring System by James W. Rowland, IEEE May 1980, pp. 59-60, and 63.
"Recent Developments in In-Plant Radiation Monitoring", subtitled Signal Processing by Distributed Microcomputer Data Modules by Charles H. Griesaker et al., Tausao vol. 28, pp. 639-641.
Levy Stewart J.
Mitsubishi Denki & Kabushiki Kaisha
Raevis Robert R.
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