Measuring and testing – Fluid pressure gauge – With pressure and/or temperature compensation
Patent
1993-02-08
1999-02-02
Felber, Joseph L.
Measuring and testing
Fluid pressure gauge
With pressure and/or temperature compensation
73726, 73727, 128675, G01L 700, G01L 906, G01L 908
Patent
active
058668217
ABSTRACT:
A compensation circuit for a resistance bridge corrects errors in the response of signal outputs thereof and has a voltage controlled current source across a power input and a ground reference providing a bridge excitation output current proportional to a fixed circuit reference voltage. A single resistor adjusts positive or negative values of the fixed part of the offset errors in the signal outputs response. Another resistor adjusts positive or negative slope of the temperature dependent part of the offset errors in the signal outputs response. A method compensates the offset errors with steps of energizing the bridge and measuring the output and resistance at two temperatures and at two pressures. The measurements are used to find correction resistances for variations in bridge offset, temperature and pressure response.
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Becton Dickinson and Company
Felber Joseph L.
Lee Eric M.
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