Abstract
The recently published IEC 61672-1 defines new standards for sound-level meters and calibrators, giving performance specifications, environmental and electromagnetic criteria, in order to overcome some important faults of the previous IEC 651-1979 and IEC 804-1985. Both of these standards have been in fact amended to include, in particular, specifications for immunity of electrostatic and electromagnetic fields. The interference of such nonacoustics factors can represent, if nonadequately recognized and quantified, an important uncertainty source in sound-pressure level measurements, able to cause errors on measurement result, variable between fractions of dB and some dB. In the present paper we will show the application of a measurement methodology able to quantify, within the framework of IEC 61672-1, the influence of electromagnetic fields on environmental noise measurements, carried out by a class I (according to IEC 651 and 804) integrating sound-level meter. In this way, we have analyzed the effect of different typologies of interfering field sources (characterized by different spectrum and emission features) on some very frequent noise-measurement configuration.
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