As part of its French standardization activities, ACEI is participating in the revision of document X07-028 entitled "Metrology - Procedure for Calibration and Verification of Thermometers - Estimation of associated measurement uncertainties".
At this stage of the drafting (as of 11/01/2017), our contribution mainly focused on the following two points:
Changes to the consideration of the result of the double weighing of Gauss for the evaluation of the uncertainty component related to the homogeneity of the comparison medium. An erroneous but common practice of taking as a component of uncertainty the value of the homogeneity divided by root of three, it was necessary to specify the use of this value. The proposed treatment (correction or linear addition to uncertainty) is now in line with the principles of GUM (NF ISO / IEC GUIDE 98-3).
Modification of the estimation and the uncertainty of the self-heating phenomena of the resistance probes