Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1977-10-31
1979-07-24
Tokar, M.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324186, 324187, G01R 2302
Patent
active
041624432
ABSTRACT:
The frequency of a pulse signal is measured by counting the number of complete pulse cycles and measuring the fractional value of any incomplete pulse cycle occuring during a fixed sampling period, and summing said number of complete pulse cycles and said fractional value of any incomplete pulse cycle so as to obtain a total proportional to said frequency. The length of the incomplete pulse cycle is measured using a clock pulse signal having a base frequency which is multiplied by an integral fractor corresponding to the number of complete pulse cycles occurring during said sampling period, said integral factor being increased by one between successive pulse cycles and the length of each and every pulse cycle being measured in the corresponding clock pulse units. The period of successive complete pulse cycles is measured using said clock pulse signal, and the period measurements of all of said complete pulse cycles are summed and the total divided into the length of said incomplete pulse cycle to produce said fractional value. The frequency is measured in successive fixed sampling periods which are overlapped in time, each sampling period commencing at the beginning of a pulse cycle and successive sampling periods each overlapping the preceding sampling period by the extent of any incomplete pulse cycle at the end of said preceding sampling period.
REFERENCES:
patent: 2665411 (1954-01-01), Frady, Jr.
patent: 3218553 (1965-11-01), Peterson et al.
patent: 3611134 (1971-10-01), McDowell
patent: 3909714 (1975-09-01), Nakano
Banks Roger J.
Brearley Malcolm
Girling Limited
Tokar M.
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