The influence of operators and applied load on micro-hardness of the standard block

Abstract

The aim of the submitted work is to study the influence of operator on measured micro-hardness if the applied loads are ranging from 0.09807 N to 0.9807 N. The ISE effect, i.e. the influence of the load on the micro-hardness is expected. Whereas standard reference block with defined specified hardness and its uncertainty was used as a specimen, individual measurement involved indirect calibration of a tester. Five operators have measured in five trials the diagonals of the same indentations. The measurement was evaluated by Meyer’s index n, ANOVA – two factor analysis, Post Hoc Analysis, Total Dispersion Zone SM%, Cgm index and Measurement Systems Analysis. The participating operators have a statistically significant effect on the value and type of the ISE effect.