Regional comparisons of national primary standards machines on the Vickers and Brinell scales

Abstract

The determination and confirmation of the calibration measurements capabilities of national metrological institutes is necessary for the verification of the estimated metrological characteristics of the primary standard machines of these institutes. The passage of national primary standards through the comparison procedure encourages a deep and detailed study of the factors that affect the uncertainty of measurements. Adding the calibration capabilities of metrological institutes to the database of the International Committee of Weights and Measures (hereinafter referred to as the CIPM) allows for calibration of measuring instruments, which is recognized by the entire world community. The article presents the results of comparisons of national primary hardness standards on the Vickers scale and on the Brinell scale between the metrological institutes of the countries that are members of the Organization of Euro-Asian Cooperation of state Metrological Institutions (СOOMET). The comparisons were carried out within the framework of the technical committee on Mass and Related quantities TC 1.6, subject code – 341/RU/05. The article describes the procedure for conducting regional key and additional comparisons of national primary hardness standards on the Brinell and Vickers scales. Based on the results of the comparisons, recommendations are given to the laboratories that participated in the comparisons about the extended measurement uncertainties that they can enter into the database of the International Committee of Weights and Measures.