TRACEABILITY SYSTEM OF ROCKWELL HARDNESS C SCALE IN JAPAN

摘要

In the early of 2003, the traceability system of the Rockwell hardness standard have been developed in Japan. The National Metrology Institute of Japan (NMIJ) started to provide the national primary hardness standards, one of which is the hardness reference blocks, and the other one is the accreditation of the Rockwell hardness tester. In this paper, we present the detail of uncertainty transfer between the NMIJ and the secondary standard laboratories.