Fourier DataNet User Manual page 165

You may calibrate all thermocouple sensor types at once, or
individually.
Prior to calibrating the PT-100 input, you must first perform
Reset Calibration in the Calibration dialog.
Two-point Calibration
The two-point calibration sets the gain (slope) and offset
(intercept) of the sensor's conversion function.
Use the two-point calibration to calibrate all DataNet sensors
except for the Thermocouples. In some cases you may need
to refine your calibration using the fine offset tuning tool.
Offset Calibration
To calibrate the Thermocouple temperature sensors: TC-J,
TC-K and TC-T, first calibrate the 50 mV sensor type. That will
set the slope for all Thermocouple temperature sensors. Then
proceed to adjust the offset using the Offset calibration
technique.
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