Moisture/yield monitor grain simulator

Crop threshing or separating – Means responsive to a sensed condition – Moisture

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460149, 56 102R, A01E 1200

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active

057162727

ABSTRACT:
A monitor for measuring the moisture content of grain comprises an AC signal source for transmitting a measurement signal along a measurement signal path that includes a sensor region in which grain may, or may not, be present, and an analyzer for determining the attenuation of the measurement signal along the path, the analyzer producing an indication of the moisture content of grain in the sensor region that is dependent on the attenuation. A simulator is provided to permit calibration, testing, maintenance and/or demonstration of the monitor without the requirement of grain in the sensor region. The simulator includes a programmable attenuator that is selectively electrically inserted in the measurement signal path and a control circuit for controlling the attenuator so that the measurement signal is attenuated and the analyzer produces an indication of grain moisture content even though no grain is present in the sensor region. The attenuator may be a PIN diode or a programmable capacitor.

REFERENCES:
patent: 5092819 (1992-03-01), Schroeder et al.
IEEE Transactions on Instrumentation and Measurement, vol. 41, No. 1, pp. 111-115, Feb. 1992.
Sensors, Sep. 1992, pp. 68-74.
Canadian Agricultural Engineering, vol. 34, No. 4, pp. 327-335 (1992).

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