Apparatus and method for a temperature compensation of a cathete

Details Apparatus and method for a temperature compensation of a cathete Apparatus and method for a temperature compensation of a cathete

1990-10-25

1992-09-15

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

With pressure and/or temperature compensation

73 4R, 73721, 73727, 338 4, G01L 906, G01L 1904

Patent

active

051467887

ABSTRACT:
An apparatus and method for compensating for temperature dependent offset and fixed offset in a resistance bridge is disclosed. The apparatus comprises a resistance bridge, a compensation network and an instrumentation amplifier. The uncompensated output of the bridge is applied to the input of the instrumentation amplifier. The output of the compensation network is fed into the instrumentation amplifier to compensate for the temperature and offset dependent components of the bridge output. The output and resistance of the bridge are measured under conditions of constant pressure and temperature for different temperatures and pressures and the temperature coefficient of resistance, temperature coefficient of offset and temperature coefficient of sensitivity are calculated. These coefficients are used to select compensation network resistors.

REFERENCES:
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patent: 4667516 (1987-05-01), Schulz
patent: 4715003 (1987-12-01), Keller et al.
patent: 4765188 (1988-08-01), Krechmery et al.
patent: 4858615 (1989-08-01), Meinema

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