Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1975-10-29
1976-08-31
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
328162, G01R 2700
Patent
active
039784010
ABSTRACT:
A distortion measurement system for measuring distortion as low as .002% includes an ultra low distortion oscillator having a relatively fast response which is achieved by switching the time constant of the control loops of the oscillator during settling. The analyzer section included in the distortion system has a unique notch filter which provides low distortion. This is achieved by adding together two 90.degree. all pass phase shifters. In addition, automatic tuning is provided by two feedback control loops; one is responsive to out-of-phase signals which controls the RC filter circuits of the phase shifters and the other responds to the in-phase signals which controls the output summing junction of the notch filter. Finally, a feedforward type of simultaneous tuning is accomplished by ganging the oscillator frequency adjustment with the analyzer.
REFERENCES:
patent: 3355668 (1967-11-01), Boensel et al.
patent: 3643073 (1972-02-01), Sawamura
patent: 3848185 (1974-11-01), Hentschel
Krawczewicz Stanley T.
Sound Technology, Inc.
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