Main text This report purposed the results of supplementary comparison of Vickers hardness, APMP.M.H-S6, among five National Metrology Institutes (NIMT, NMIJ/AIST, KRISS, CMS/ITRI and SASO-NMCC). The comparison was carried out during November 2015 to January 2019 in order to determine the capability of the primary Vickers hardness standard, including standard conditions of each participant, to confirm the accuracy of Vickers hardness scale HV5, HV10, HV20, HV30, HV50 and HV100 measurement declared by each participant, which includes the effect of each participant's primary indenter, and determine the degrees of equivalence of hardness scale measurement in the range 100HV to 900HV. The pilot institute was the National Institute of Metrology (Thailand), NIMT. There were 2 different types of artifacts for the comparison. The first and second set were the set of Vickers hardness comparison: hardness measurement. The third set is a set of diagonal length comparison: diagonal length measurement. The measurement results of each participant were used to compute the degree of equivalence in comparison reference value (CRV) and the uncertainty of this deviation at a 95% level of confidence. The En parameter was calculated to express the equivalence between the measurements of participants as well. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/. The final report has been peer-reviewed and approved for publication by the CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

In order to investigate micro hardness and stiffness in a special chamber, the development of a small-force generator mechanism and a piezodriven microrobot is described in this paper. This small-force generator is simply composed of a Voice Coil Actuator (VCA) and the tandem leaf spring mechanism. The small force can be controlled by an electrical current, which is supplied to the coil and positioned precisely at the balance point with the parallel leaf spring with no mechanical friction. The full bridge strain gauges on both sides of the double leaf spring can detect a small force that is applied to the sample with a microindenter. This handmade small device can produce and verify small forces up to 17 mN with good linearity and a 50 µN resolution. The displacement of the indenter head can be also measured by the Linear Valuable Differential Transformer (LVDT) on the machine for monitoring the depth behavior of the indenter during the whole dwell time. The small force generator with the indenter can be implemented on the piezodriven microrobot to check the microscopic hardness and stiffness. This microrobot can move around the measurement area precisely step by step with 1 µm steps on a metal plate, so that the sample can be scanned with microscopic resolution in situ, such as in an SEM chamber. In the experiment results, the basic performance of microelasticity investigations with a certified hardness block was successfully checked and the indentation load-depth characteristics were precisely acquired on the path of the microrobot.

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Main text This report purposed the results of supplementary comparison of Brinell hardness, APMP.M.H-S5, among three National Metrology Institutes (NIMT, NMIJ/AIST and KRISS). The comparison was carried out during April 2018 to July 2019 in order to determine the capability of the primary Brinell hardness standard, including standard conditions, of each participant, to confirm the accuracy of Brinell hardness scale HBW 10/500 and HBW 10/3000 measurement declared by each participant, which includes the effect of each participant's primary indenter, and determine the degrees of equivalence of hardness scale measurement in the range 45HBW to 550HBW. The pilot institute was the National Institute of Metrology (Thailand), NIMT. There were 2 different types of artifacts for the comparison. The first set was the set of Brinell hardness comparison: hardness measurement. The second set is a set of diameter length comparison: diameter length measurement. The measurement results of each participant were used to compute the degree of equivalence in comparison reference value (CRV) and the uncertainty of this deviation at a 95% level of confidence. The En number was calculated to express the equivalence between the measurements of participants as well. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/. The final report has been peer-reviewed and approved for publication by the CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).