The digital measurer of temperature with platinum thermoresistor

The measurer is designed for temperature measuring in working conditions in range of 0 to 50/spl deg/C with platinum resistance thermoconverter (RT) of non-linear standard graduation. It is applied the compensated measuring circuit with four-wire connection of RT, measuring amplifier, ADC of double integration. For linearization of conversion function the positive feedback is applied. The metrological analysis of measurer is carried out. The measurer can provide the temperature measuring with error no more than /spl plusmn/0,2/spl deg/C.