Thermocouple circuit

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Konstabel

Joined Jan 31, 2008
52
In the attached circuit from the LT1025 datasheet, it is noted "Selected for 0-100 degree range". How was this resistor value chosen? I am looking to apply this circuit to a 0-150 degree range.
 

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hgmjr

Joined Jan 28, 2005
9,029
The answer lies in the fact that the temperature coefficient of the type-K thermocouple is 40.3 microvolts per degree C. To get to 10 millivolts per degree C requires a gain of around 244. The opamp's gain is therefore set to this value by the selection of the feedback resistors.

hgmjr
 
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