Method for compensating errors in a pressure transducer
First Claim
1. A method for using a pressure transducer to monitor pressure and for compensating for variances in both a characteristic pressure sensitivity and a zero pressure offset of an output signal of the pressure transducer, comprising the steps of:
- (a) providing a gain resistor that is unique to the pressure transducer, wherein the gain resistor has a resistance that compensates for the characteristic sensitivity of the pressure transducer such that when the pressure transducer is used to monitor pressure, the output signal varies with pressure in a predetermined manner;
(b) determining a zero pressure offset compensation to compensate for the zero pressure offset of the pressure transducer; and
(c) compensating the output signal from the pressure transducer for the zero pressure offset while monitoring the pressure with the pressure transducer.
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Accused Products
Abstract
Disclosed is a method of compensating any of a plurality of different pressure transducers for their characteristic pressure sensitivity, zero pressure offset, and self-heating error. The method comprises selecting a gain resistor that adjusts the gain of an output signal of the pressure transducer in use so that the pressure transducer appears as an ideal pressure transducer to a pressure monitor. The self-heating error is compensated by measuring an initial bridge voltage that drives the transducer and an initial output signal of the pressure transducer when the transducer is first energized. After a period of time a second bridge voltage and a second output signal are determined. The self-heating error is determined as a function of the difference between the initial and second values. The zero pressure offset is compensated by determining the output signal of the pressure transducer at zero gauge pressure after the pressure has been compensated for the self-heating error.
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Citations
7 Claims
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1. A method for using a pressure transducer to monitor pressure and for compensating for variances in both a characteristic pressure sensitivity and a zero pressure offset of an output signal of the pressure transducer, comprising the steps of:
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(a) providing a gain resistor that is unique to the pressure transducer, wherein the gain resistor has a resistance that compensates for the characteristic sensitivity of the pressure transducer such that when the pressure transducer is used to monitor pressure, the output signal varies with pressure in a predetermined manner; (b) determining a zero pressure offset compensation to compensate for the zero pressure offset of the pressure transducer; and (c) compensating the output signal from the pressure transducer for the zero pressure offset while monitoring the pressure with the pressure transducer. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification