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A regional key comparison, APMP.L-K4, was held in 2008. To demonstrate the equivalence of routine calibration services offered by NMIs to clients, participants in this APMP.L-K4 comparison agreed to use the same apparatus and methods as routinely applied to client gauges.There are 14 laboratories from NMIs involved this key comparison, which included CMS/ITRI, NMIJ/AIST, NPL-I, NIMT, Puslit KIM-LIPI, NMISA, MSL, NMIA, NML-SIRIM, VMI, KRISS, SCL, NMC/A*STAR and NSCL.This report describes the measurement results of five diameter standards including two rings and three plugs. The calibrations of this key comparison were carried out by laboratories during the period from May 2008 to November 2010.Main text. 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 kcdb.bipm.org/.The final report has been peer-reviewed and approved for publication by the CCL, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

The results of the APMP key comparison on calibration of gauge blocks by interferometry (APMP.L-K1.1.2011) are reported. This comparison is bilateral between KIM-LIPI and NMIJ and used a similar set of steel gauge blocks ranging from 0.5 mm to 100 mm in length as APMP.L-K1.1. The results are analyzed using En numbers with weighted mean values as the reference values. The agreement between the laboratories is well within the expanded uncertainties. However, there are signs of possibilities of latent offset and length-dependent errors. Furthermore, the KIM-LIPI's results on the gauge block of 90 mm showed a strange distribution. Further investigation and comparison with other laboratories are advisable.Main text. 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 kcdb.bipm.org/.The final report has been peer-reviewed and approved for publication by the CCL, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

High accuracy check master is a type of geometry gauge that often used to check the accuracy of Coordinate Measuring Machine (CMM) in the high-class metrological institutes and manufacturing industries. This type of geometry gauge is composed of several high-accuracy short gauge blocks and a large rod as its foundation. Conventionally, the measurement of high accuracy check master can be carried on by using measuring machine. Since the bench has limit up to 400 mm, the measurement of high accuracy check master more than 400 mm range is performed in two-step. Firstly, from nominal range of 10 mm to 400 mm and the other range by utilizing extension. In some cases, this measurement method has bigger expanded uncertainty value, i.e. more than 2 µm. Since the check master has important role to verify the accuracy of CMM, the quality of calibration system of high accuracy check master is required to be improved. This paper describes only to achieve high accuracy of measurement up to 400 mm. In the developed measuring system, the heterodyne laser interferometer is used as the reference. The optical configuration of laser is combined with the measuring machine as a moving part. In order to improve the accuracy of measurement, the refractive index of air and the temperature compensation are recalculated manually by Edlen’s formula and linear expansion equation, respectively. Using this method, the expanded uncertainty from calibration 400 mm high accuracy check master is less than 1 µm. The results had a good agreement to the measurement results from manufacturer with international certification, experimentally. In conclusion, this method can be applied to calibrate the high accuracy check master of 400 mm range.

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