Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1978-11-03
1980-12-30
Heyman, John S.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
328134, 328147, 324 82, 368118, H03K 526
Patent
active
042426375
ABSTRACT:
The relative occurrence of first and second input signals is determined by sampling the output signal of a comparator which compares a predetermined voltage source output signal with the output signal from a ramp generator which is triggered by the first input signal. The sampling signal is provided in response to the second input signal after a preselected time delay. A balancing calibration is used to insure that if the signals are coincident, the ramp generator signal is equal to the voltage reference signal at the moment of sampling. Therefore, the precedence of the first and second input signals is determined by sampling the comparator output signal in response to the sampling signal and determining the relative values of the ramp voltage signal and the voltage reference signal at the time of sampling.
REFERENCES:
patent: 2940073 (1960-06-01), Spranger et al.
patent: 3409830 (1968-11-01), Phillips
patent: 3634772 (1972-01-01), Katz
patent: 3663884 (1972-05-01), Pattantyus
patent: 3705358 (1972-12-01), Bauman et al.
Boone David A.
Hewlett--Packard Company
Heyman John S.
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