Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1984-04-06
1986-05-13
Krawczewicz, Stanley T.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
G01R 2726
Patent
active
045889430
ABSTRACT:
An instrument for measuring the moisture content of dielectric objects has a housing which supports capacitance measuring means. The capacitance measuring means includes a circuit which is connected with a high frequency voltage source and is designed to measure changes in capacitance. The capacitance measuring means further includes an electrically conductive rod which projects from the housing and carries an active electrode at the end thereof remote from the housing. The active electrode is connected with one terminal of the circuit and is designed to generate a diverging voltage field which penetrates into an object undergoing moisture determination. The capacitance measuring means is devoid of an electrode which is capable of cooperating with the active electrode to generate signals during moisture determination. Instead, the second terminal of the circuit is connected with a metallic cover plate which forms part of the housing and constitutes a ground of the latter. The cover plate is designed to be contacted by an operator and thus grounded during moisture determination.
REFERENCES:
patent: 2428700 (1947-10-01), Eilenberger
patent: 3559052 (1971-01-01), Fathauer
patent: 3609735 (1971-09-01), Dauterman
patent: 3651505 (1972-03-01), Schmidt
patent: 3714560 (1973-01-01), Farr
patent: 3879644 (1975-04-01), Maltby
Gann Mess-u. Regeltechnik GmbH
Kontler Peter K.
Krawczewicz Stanley T.
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