Abstract
Since 1979 the Danish Environmental Protection Agency's Reference laboratory for noise measurements have arranged proficiency testing for the around 30 approved Danish laboratories that are measuring environmental noise. Many of these "comparison measurements" have included objective analysis of the prominence of audible tones according to the Joint Nordic Methods which are the predecessors and very similar to the method described in ISO 1996 part 2 Annex C. This paper gives examples on (computerized) analyses of the samples from these proficiency tests and states the uncertainties that can be expected when a number of laboratories with different experience and different types of equipment analyze the same samples. The samples will be available for future reference and can be downloaded from DELTA's homepage.
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