The measurement uncertainty in the calibration of a thermometer depends on the calibration method used, the uncertainty contri

u_Tra: repeatability of measurements during a calibration. We assume at least 50 measurements of reference standard was made at each calibration point. Standard deviation of mean is calculated.

Example: u_Tra= 0.002°C

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  u_Trcon: uncertainty contribution due to a possible heat conduction by the reference standard. Tests should be made at different immersion depths.
  

Example: pulling the reference standard 20 mm out of the bath led to a temperature change of 2 mK (which due to the temperature variations of the bath could be estimated only inaccurately).

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