Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-06-21
1977-01-25
Heyman, John S.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
328140, 328136, 328 71, H03K 518, G01R 2310
Patent
active
040053644
ABSTRACT:
A digital circuit determines the maximum frequency present in a first pulse train and indicates when a selected fraction of this maximum frequency is exceeded in subsequent pulse trains. The invention comprises a prescaler circuit for the purpose of reducing the frequency of the input pulse train to a level suitable for a digital period-measuring circuit; a digital period-measurement circuit that measures the period of the output of the prescaler and compares that measured value to a stored value; a frequency-multiplier circuit that produces the reference frequency used to measure the period in the period-measurement circuit; and a control circuit to operate the circuits in a first mode for storing a digital value representative of the maximum frequency present in the input pulse train, and in a second mode for comparing the frequency of subsequent pulse trains with the value stored in the first mode. The control circuit produces an output signal when the frequency of the subsequent pulse train exceeds a selected fraction of the maximum frequency present in the first pulse train.
REFERENCES:
patent: 3304504 (1967-02-01), Horlander
patent: 3537003 (1970-10-01), Planta et al.
patent: 3571760 (1971-03-01), Schwartz
patent: 3909714 (1975-09-01), Nakano
Doble Arthur V.
Heyman John S.
MDH Industries Inc.
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