Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1978-01-31
1979-08-21
Krawczewicz, Stanley T.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
G01R 2702
Patent
active
041654838
ABSTRACT:
An improved capacitive pick-off circuit is provided by utilizing a reference current generator to apply a square wave to a pick-off capacitor and the resulting voltage across the capacitor is then applied to a fixed capacitor. The resulting fixed capacitor current then provides a measure of the capacitance of the pick-off capacitor. A differential capacitive pick-off circuit is provided by applying the reference current to each pick-off capacitor and providing a fixed capacitor for each of the pick-off capacitors. The resulting fixed capacitor currents are combined and the resulting differential current is used as a measure of the difference in capacitance or the difference in the gaps between the plates of the capacitors.
REFERENCES:
patent: 2721975 (1955-10-01), Wojciechowski
patent: 2820194 (1958-01-01), Reinartz
patent: 3135916 (1964-06-01), Tannenbaum et al.
patent: 4065715 (1977-12-01), Jaffe et al.
patent: 4086528 (1978-04-01), Walton
patent: 4093915 (1978-06-01), Briefer
Holdren Fred V.
Hulsing II Rand H.
Steinke Kurt E.
Killingsworth Ted E.
Krawczewicz Stanley T.
McMurry Michael B.
Peoples William R.
Sundstrand Data Control Inc.
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