Help designing a thermistor circuit
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Feb4-09, 05:29 AM
Redbelly, using your more better 273.15K = 0C, I calculated the error incurred for various bias resistors. But PF doesn't accept MathCad files, so I can't attach it.
The results are pretty impressive. A 3.01K will deviate ~ -3.75% from a straight line passing through the end points at 25C and 40C. The optimal bias resistor is 1.45K with ~ +/-0.3% error, but the voltage across the thermistor is above the 0 to 2.55 volt ADC range.
Windows won't display a MathCad 7 plot correctly. Oh well.
How did you calculate the error ?