Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1977-02-23
1978-05-16
Heyman, John S.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324181, 328147, 328150, 328112, H03K 518, H03K 1303
Patent
active
040901416
ABSTRACT:
A device for measuring the time interval separating the appearances of two correlated pulses which have independent amplitudes and rise times includes two timing circuits. Each timing circuit includes a time to pulse height converter which is started by a threshold discriminator when the first pulse s passes through a preset amplitude threshold, and stopped by another threshold discriminator when the second pulse passes through the same threshold. The thresholds of the two timing circuits are different, and the output signal of each circuit is related to the duration of the interval to be measured by a respective conversion factor. The ratio of the two thresholds is equal to the ratio of these two conversion factors. A differential output circuit receives the timing circuit output signals and outputs a signal proportional to the difference in their amplitudes, which is also proportional to the duration of the interval to be measured. The device also includes control circuitry which inhibits the provision of an output signal if certain specified conditions are not satisfied, and which resets the device after each measurement or aborted measurement.
REFERENCES:
patent: 3579126 (1971-05-01), Paul
patent: 3601706 (1971-08-01), Battle et al.
patent: 3634869 (1972-01-01), Hsueh
patent: 3668529 (1972-06-01), Meyer
patent: 3996586 (1976-12-01), Dillon et al.
patent: 4017747 (1977-04-01), Sheng
Agence Nationale de Valorisation de la Recherche (ANVAR)
Heyman John S.
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