RESISTANCE TYPE CONVERTER

摘要

PURPOSE:To enable the detection of a physical quantity to be measured at a high accuracy by providing a sensor having a variable resistance, a span resistance and a zero-point resistance and a specified signal processing circuit to achieve a complete freedom from effect by temperature variations. CONSTITUTION:This apparatus is provided with a sensor 10 which is made up of piezo-electric resistances 11a, 11b and 11c respectively composing a variable resistance with the resistance value RM varying according to the physical quantity to be measured, a span resistance with the resistance value RS corresponding to a fixed physical quantity and a zero-point resistance with the resistance value RZ equal to the initial value of the variable resistance and a signal processing circuit 20 which detects resistance values of the sensor 10 and computes the value of (RM-RZ)/(RS-RZ) to output a signal according to the physical quantity to be measured. This makes the output voltage E0 free from effect by temperature variations thereby enabling the detection of the physical quantity being measured at a high accuracy.