Article In the MAX31855, how is the reference junction temperature data used?

The reference junction temperature is provided to support linearization of the thermocouple, per NIST standards. Thermocouples are inherently non-linear. Thus, linearization increases accuracy. Linearizing the thermocouple result needs to be performed externally using the NIST calculations and coefficients: http://srdata.nist.gov/its90/main/

As an alternative, the MAX31856 performs on board linearization for all supported thermocouple types.

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