Determination of measurement uncertainties in building acoustics by interlaboratory tests

Following similar contributions on the measurement of airborne sound insulation (part 1) and absorption coefficient in reverberation rooms (part 2) this part 3 introduces a data collection on interlaboratory tests on the measurement of impact noise level and impact noise reduction. The data base comprises 1614 one-third octave band spectra in total. The data is analysed in one-third octave bands and also for single-number quantities. Typical average values are derived for the standard deviation of reproducibility, the in-situ standard deviation and the standard deviation of repeatability. The typical values are compared to the values currently standardised in ISO 12999-1 for airborne sound insulation, impact noise level and impact noise reduction to check whether their values are reasonable within the system of existing typical values. Finally, proposals for a possible revision of ISO 12999-1 are derived.