Study on the Uncertainty of Surface Thermometer Calibration System.

Abstract

The Guide to the Expression of Uncertainty in Measurement (GUM) published in 1993 under the names of seven international organizations including the ISO (Technical Advisory Group on Metrology (TAG4))gives methods of evaluating the reliability of measurement. Methods of estimating uncertainty are classified as type A (evaluated by statistcal methods) and type B (evaluated by the other methods). The uncertainty requirement was eliminated from the 2000 edftion of ISO 9000s (Quality System), however. This seems to have been done because general manufacturing companies find it difficult to implement the uncertainty calculations carried out in laboratories accredited under ISO/IEC 17025 or the Japan-Calibration Service System (JCSS). We therefore used JIS Z9090-1991 (Measurement-General rules for calibration system) to calculate and verify uncertainty in type A items.