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Linear_thermometer

2017-03-19 06:24  
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Linear_thermometer
This circuit uses both sections of an LT1002 to form a simple (but accurate) thermometer. To calibrate, substitute a precision decade box (General Radio 1432-K) for the sensors. Set the box to the 0°C value (1000.0Ω) and adjust the offset trim for a 0.000-V output. Then, set the decade box for a 35°C output (1138.7 Ω) and adjust the gain trim for a 3.500-V output reading. Finally, set the box to 1392.6 Ω (100.00°C) and trim the linearity adjustment. Repeat the sequence until all three points are fixed. The total error over the entire range will be within ±0.025°C.