High accuracy frequency modulation waveform tester

Details High accuracy frequency modulation waveform tester High accuracy frequency modulation waveform tester

1988-01-25

1989-02-21

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

455 67, 455226, G01R 2314

Patent

active

048068535

ABSTRACT:
The maximum and minimum depth of modulation of a carrier signal frequency modulated by a modulating sine wave is measured by a frequency counter responsive to an external gate. The external gate is generated by detecting the positive-going and negative-going zero crossings of the modulating signal and providing a gate generating trigger delayed by 90.degree. of the modulating signal less a predetermined number of cycles of the carrier. The parameters are selected such that the gate is centered around the positive and negative peak amplitudes of the modulating signal.

REFERENCES:
patent: 3909725 (1975-09-01), Baghdady
patent: 4088948 (1978-05-01), Miedema
patent: 4653116 (1987-03-01), Lindenmeier

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