Influence of Thermostatic Contributions of Stability and (in) Homogeneity on Calibration Results of Self-indicating Thermometers

Calibrations of thermometers are carried out by a comparative method. During calibration the major role has selected calibrated standard-which has traceability towards standard of a higher level of metrology ability. But the major role in calibration has also temperature source-thermostat (the bath in a further text). By usage of different temperature sources-baths, different calibration results are gained. The calibration results represent the established deviation of the thermometers. The significant contributions that are coming from the bath and on which the accent is in are contributions of stability and (in) homogeneity of a bath. The contributions of stability and (in) homogeneity of the used baths are well known, either those were confirmed by measuring or are given by manufacturer. Calibration has been performed at two same calibration temperatures in two baths, same probe is used. It was established that the results gained in one bath were different from those gained in another one and that for is considered that mentioned contributions have influenced on it. That would be presented in this paper.