Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1985-06-12
1987-02-24
Tokar, Michael J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 77R, 324 78R, 328155, G01R 2314
Patent
active
046460047
ABSTRACT:
A method for phase-locked sampling measurement of a periodically varying quantity. The samples are designated g(I) . . . g(I-n) and may comprise one complete period or a half of one period. The method involves adapting the sampling frequency and the sample position in relation to the quantity to be measured such that phase locking is attained, and this is done by controlling the time interval between sampling. Whether the sampling frequency needs to be increased, left unchanged or be decreased, depends on a number of decisions depending on the values of samples g(I) and g(I)-g(I-n). A device for carrying out the method is also described.
REFERENCES:
patent: 3916307 (1975-10-01), Hekimian
patent: 3961255 (1976-06-01), Hekimian
patent: 3978403 (1976-08-01), Mansfield
patent: 4117419 (1978-09-01), Rudd
patent: 4374358 (1983-02-01), Hirose
patent: 4430611 (1984-02-01), Boland
Brandt Nils
Karlsson Anders
ASEA Aktiebolag
Tokar Michael J.
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