Final report of APMP.AUV.V-S1: supplementary comparison on calibration of laser tachometers using mechanical generators

This is the final report for APMP supplementary comparison APMP.AUV.V-S1 in the area of 'vibration' (quantity of rotational speed). The aim of this comparison was to compare primary measurements of rotational speed in the range from 10 r/min to 99 999 r/min. Two Metrology Institutes from APMP have participated in the comparison with National Institute of Metrology, P.R. China as pilot lab. Both laboratories used mechanical generators as standard equipment and provided their calibration results, which were all consistent within their declared expanded uncertainties for the measurement results except for 10 r/min. Both participants contributed to the SCRVs calculated for thirteen rotational speed comparison values. NMC was not consistent within their declared expanded uncertainties at 10 r/min. Further improvements of their calibration devices and uncertainty evaluations will provide more accurate and reliable measurement results in the future.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 CCAUV, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).