Calibrating an AD592 temperature transducer
The datasheet for AD592 recommends 4-30V supply voltage. 3.3V is probably too low a voltage for AD592 to operate properly. It is more like 3.0V if you take into account 0.3V voltage drop on the resistor ( at room temperature ). Unless you require better than 0.5 C accuracy the calibration is not needed at all.