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Originally Posted by Les
Maybe something like this:
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If I am following you correctly Les, yes, thats essentially what I am driving at.
The curves for the RTD responses, ideal vs actual, meet somewhere but their roc is different. We are looking at small errors here in the context of overall accuracy...
Or something like this.
Bills calibration
should take care of this but I am curious about the "RTD Calibration in Hardware" statement. I am not a fan of using the alpha temp coefficient for Resistive sensors, RTDs are nowhere near as bad as NTC thermistors, being actually incredibly linear, but there are residual errors if the hardware is using it is as the calibration method. Way prefer the 3rd order fit (Steinhart-Hart for thermistors) especially over a large range. This is not the error in this case though (If it is in fact an error)
At 35C the Cp should perhaps be 4154J/l ish, but this has a very small effect on the power calc.