DEVICE AND METHOD FOR DIGITALLY MEASURING A VOLTAGE VARYING WITHIN A GIVEN RANGE, AND USES THEREOF

摘要

A method wherein (a) a voltage to be measured (Ue) is amplified with a gain proportional to the ratio between the reference voltage (Vref) of an analogue-to-digital converter (3) and the extent of the voltage range; (b) the reference voltage (Vref) is amplified with a gain proportional to the ratio between the lower terminal (U1) of the voltage range and the extent of said voltage range; and (c) the analogue input of the converter (3) is supplied with the resulting amplified voltage difference. The method is useful for measuring a temperature by means of a thermocouple and measuring the temperature of an oxygen sensor in a motor vehicle exhaust line.