Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1996-08-29
1998-06-09
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 7664, 377 44, 377 20, G01R 2302
Patent
active
057640459
ABSTRACT:
A fractional time frequency measuring apparatus includes a divider for dividing a frequency of a signal to be measured with a predetermined division factor; a counter unit for counting the divided signal with a standard clock for every period of the divided signal and outputting count results; a fractional time measuring unit for measuring fractional times produced by the counting with the standard clock; a sequence control unit to form a sequence circuit for sequentially counting the divided signal with the standard clock; a memory unit for holding the count results from the counter unit; a microprocessor for determining a value of the divisional factor, generating a reset signal, and calculating the frequency of the signal to be measured from the count results stored in the memory unit. The sequence control unit counts a predetermined number of pulses of the standard clock while it generates a write signal of count results in the memory unit, a reset signal for the counter unit, and an address signal for the memory unit; and the counter unit is preset at a value equal to the predetermined number of pulses.
REFERENCES:
patent: Re32845 (1989-01-01), Hayashi
patent: 4112358 (1978-09-01), Ashida
patent: 4953095 (1990-08-01), Ishikawa
patent: 5095264 (1992-03-01), Hulsing
patent: 5128607 (1992-07-01), Clark
Advantest Corporation
Karlsen Ernest F.
Solis Jose M.
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