Patent ID: 6048094
Filing Date: 2000-04-11
Classification: G01K

Abstract:
A method for measuring a temperature, which comprises the steps of:providing a negative temperature coefficient sensor having a variable internal resistance;connecting a signal processing stage to the sensor, the signal processing stage including at least one pull-up resistor and a transistor connected in parallel therewith;connecting an A/D converter to the signal processing stage, the A/D converter having an analog input receiving a voltage tapped at a node between the variable internal resistance of the sensor and the at least one pull-up resistor;driving the transistor with a square-wave voltage from the signal processing means alternately turning the transistor on and off, and measuring the voltage at the analog input of the A/D converter when the transistor is turned on and when the transistor is turned off;determining a saturation voltage of the transistor from the two measurements in the measuring step by the signal processing means; anddeducing from the saturation voltage a corrected voltage value and ascertaining from the corrected voltage value a temperature prevailing at the sensor by the signal processing means.