Thermocouple compensation

scubasteve_911

Joined Dec 27, 2007
1,203
Konstabel,

To compensate digitally, two methods are generally used. If you have plenty of memory, then a lookup table is generated. So, you read a particular value, then it corresponds to the actual temperature. Another method is polynomial fitting, which uses much less memory, but requires processing. Basically, you can plot in MATLAB and then use the curve-fitting tool to find the necessary order and coefficients for the polynomial fit. There are other ways to do this, including on paper. Software is the way to go though :D

Steve
 

Thread Starter

Konstabel

Joined Jan 31, 2008
52
Thanks for all the replies.

Scuba just to make sure. If doing the compensation digitally, the fluctuation in room temperature and thus the cold junction temp, is not taken into compensation, right?

Thanks for the diagram kender. The 'pizza slices' in your diagram, are the opamps?
 

hgmjr

Joined Jan 28, 2005
9,029
Yes. The "pizza slices" represent opamps. You will need to elaborate on their design with additional components since the symbols are just there to show the need for gain yet there are no gain setting components shown.

hgmjr
 
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