Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1975-05-22
1977-04-19
Krawczewicz, Stanley T.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
G01R 2702
Patent
active
040191320
ABSTRACT:
A method and apparatus for determining the moisture content of different kinds of materials wherein electrodes having a voltage supplied thereto are applied to the material to be tested for providing a measuring current corresponding to the moisture content of the material. The measuring current is applied to an amplifier having a low-valued input resistance and the moisture content is determined by adjusting a scale graduated in moisture values in accordance with the output of the amplifier. A balancing device is provided for balancing the output of the amplifier and the scale is connected to the balancing device to indicate a balance position as the moisture content value. The amplifier is also provided with a device for converting the measuring current to a voltage corresponding to the logarithm of change in current and a device for providing temperature compensation.
REFERENCES:
patent: 3287978 (1966-11-01), Knudsen
patent: 3427537 (1969-02-01), Osborne
patent: 3493857 (1970-02-01), Silverman
patent: 3588728 (1971-06-01), Elazar
patent: 3680384 (1972-08-01), Gridheim
patent: 3688581 (1972-09-01), LeQuernec
patent: 3766471 (1973-10-01), Pullman
Krawczewicz Stanley T.
Zellweger Ltd.
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