Measuring and testing – Fluid pressure gauge – Diaphragm
Patent
1978-03-02
1979-03-06
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Diaphragm
323 51, 336 30, G01L 910
Patent
active
041424204
ABSTRACT:
In a pressure transducer of the type utilizing movement of a pressure responsive member to move the core of a differential transformer which is excited periodically by an oscillation circuit and produces a.c. voltages converted into a d.c. output voltage by an AC-DC conversion circuit, a calibration circuit which produces a variable calibrating voltage is provided. Calibrating the output voltage of the pressure transducer to a reference value at a reference pressure is attained by two sequential steps. In the first step, relative position between the core and the windings of the differential transformer is determined, with the reference pressure exerting on the pressure responsive member and with the calibration circuit being disconnected from the conversion circuit, so that the d.c. output voltage deviates from the reference value. In the second step, the calibration circuit is connected to the conversion circuit and the calibrating voltage is varied so that the d.c. output voltage is calibrated electrically to the reference value.
REFERENCES:
patent: 3848180 (1974-11-01), Jonke et al.
Maeda Shinichi
Oiwa Katsuhiko
Nippondenso Co. Ltd.
Woodiel Donald O.
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