Temperature sensor and DVM interface


Posted on May 6, 2012

The DVM gives a direct indication of the temperature of the sensor in degrees Centigrade. The temperature sensor IC1 gives a nominal 1 µ per degree Kelvin which is converted to 10 mV per degree Kelvin by Rl and VR1. IC2 is a micropower, low input drift op amp with internal voltage reference and amplifier. The main op amp in IC1 is connected as a voltage follower to buffer the sensor voltage at Rl. The second amplifier in IC1 is used to amplify the .2 V internal reference up to 2.73 V in order to offset the 273 degrees below 0°C.


Temperature sensor and DVM interface
Click here to download the full size of the above Circuit.

The output voltage of the unit is the differential output of the two op amps and is thus equal to 0.01 V per °C.




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