AD587 precision voltage reference 10. OOV generated by 27kfl resistor added compensation diode IN4148 and the thermocouple, and to VI + N terminal of the differential amplifier provides a fixed operating point. Thermocouple output voltage to the differential
amplifiers feet, INA131 gain amplifier, the output voltage vo = IOO (upbraid -Va), once readers tune of 100 set in the future, the amount of change of the output voltage decided by Va. Thus, n can adjust the operating point of the amplifier.