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11-27-2003 03:10 AM

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This is sound like the Mathematic problem. I measure the voltage (SCXI-1121) of PT100. After I got the signal I need to calculate back to Temp.

My problem is about how to recalculate from the polynomial equation of PT100 as following

Rt=R0[1+at+bt^2+c(t-100)t^3] :

Rt : from measurement

R0 : 100 ohm

I also try with Mathlab (roots() command) and iteration but the answer has a lot of root and complex root in which it is far away from the actual temp value.

I don't know that I did is the wrong solution to get the Temp value ?

Thank you in advance for anybody help.

12-01-2003 07:27 PM

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How Do I Calculate a Thermocouple Reading, That Uses Cold Junction Compensation, By "Hand?"

http://digital.ni.com/public.nsf/websearch/DBF08A40F88F9C8D8525643A00578E53?OpenDocument

Also, if you have LabVIEW, there is a VI that does this conversion from voltage to temperature for you. The VI is called 'Convert Thermistor Reading VI' and can be found in the Data Acquisition>>Signal Conditioning subpalette.

I hope this helps.

Regards,

Todd D.

NI Applications

Engineer