Digital humidimeter

Details Digital humidimeter Digital humidimeter

1979-02-12

1981-09-01

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

G01R 2726

Patent

active

042874700

ABSTRACT:
This invention relates generally to an apparatus for measuring capacitance and resistance and more particularly to a digital humidimeter, which can be used for determining the moisture content of cereals and other powdered, granular or granulated substances.
The apparatus for measuring capacitance and resistance according to the invention is characterized in that two RC impulse generators are provided which generate pulses proportional to the capacitance or resistance to be measured. These generators are triggered by a control circuit. A subtraction circuit is connected on the output of the impulse generators. The subtraction circuit makes possible the measurement of the difference of two capacitances or resistances. The output of the subtraction circuit is connected to one of the inputs of the gate. Another input of the gate is connected to a controllable generator. The output of the gate is connected to a counter. The erase input of the counter is connected to the control circuit. The output of the counter is connected through a linearity circuit to a display. The linearity circuit can modify any monoton function.

REFERENCES:
patent: 3012193 (1961-12-01), Breen
patent: 3227952 (1966-01-01), Proebster et al.
patent: 3761810 (1973-09-01), Fathauer

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