Final report on key comparison APMP.AUV.A-K5

Main text This is the final report for key comparison APMP.AUV.A-K5 on the pressure calibration of laboratory standard microphones in the frequency range from 2 Hz to 10 kHz. Eight laboratories took part in the key comparison. National Institute of Metrology (NIM, China) and Center for Measurement Standards, Industrial Technology Research Institute (CMS-ITRI, Chinese Taipei) piloted the project. Two travelling standard microphones were circulated to the participants and results in the form of regular calibration certificates were collected throughout the project. The analysis used the results for one of the microphones only and values for both sensitivity level and sensitivity phase have been linked to the key comparison reference value (KCRV) of CCAUV.A-K5 via three linking laboratories (NIM, KRISS, NMIJ/AIST). 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).