Report on key comparison CCAUV.A-K1

Abstract

This is the final report for key comparison CCAUV.A-K1 on the pressure calibration of laboratory standard microphones in the frequency range from 125 Hz to 8 kHz. Twelve national measurement laboratories took part in the key comparison and the National Physical Laboratory 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 key comparison reference value (KCRV) has been calculated using the unweighted mean value of the results. Deviations from this value are below 0.05 dB at all frequencies. A frequency of 250 Hz has been chosen to illustrate the degrees of equivalence with the KCRV. In all but one case, the degree of equivalence is smaller than the associated uncertainty.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 CCAUV, according to theprovisions of the Mutual Recognition Arrangement (MRA).