Abstract
The indentation diameter measurement is the important issue for Brinell hardness test. The large dependence of optical system is found in the first world-wide international comparison for Brinell hardness, conducted in 2005. After the comparison, some studies was carried out especially for this issue. Finally, the definition regarding the Brinell indentation edge was studied. However, the practical guide for good measurement condition of Brinell indentation diameter by using measurement microscope is not detailed explained. In this paper, we present the cause of the numerical aperture dependence of Brinell indentation diameter and also present the practical guideline of the selection of objective lens used to the observation.
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