Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1977-06-29
1978-06-06
Krawczewicz, Stanley T.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
324 61QL, G01R 2726
Patent
active
040939154
ABSTRACT:
A system for generating a signal linearly related to the capacitive reactance of a sensor capacitor. The system includes an oscillator for providing an oscillatory signal characterized by a peak-to-peak voltage proportional to an applied control signal, at least one capacitive network and associated peak detecting network, and a feedback network. The capacitive network includes a drive capacitor and a sensor capacitor connected in series between the oscillator and a reference potential, and the peak detector includes means to generate a peak signal representative of the peak-to-peak voltage at the junction between its associated coupling and sensor capacitor. The feedback network produces the control signal for the oscillator whereby the peak amplitude of the voltage across the drive capacitor is constant.
REFERENCES:
patent: RE27829 (1973-12-01), Tiffany
patent: 3497801 (1970-02-01), Clower et al.
patent: 3585496 (1971-06-01), Ichijo
patent: 3641414 (1972-02-01), Thompson
patent: 3688190 (1972-08-01), Blum
patent: 3694741 (1972-09-01), Abbe
patent: 3862571 (1975-01-01), Vogel
patent: 4006411 (1977-02-01), Akagawa et al.
Krawczewicz Stanley T.
Setra Systems, Inc.
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