1.1 General This International Standard specifies two methods for determining the emission sound pressure levels of machinery and equipment, at a work station and at other specified positions nearby, by calculation from the sound power level. The principal purpose of this determination is to permit comparison of the performance of different units of a given family of machinery or equipment, under defined environmental conditions and standardized mounting and operating conditions. The data obtained may also be used for the declaration and verification of emission sound pressure levels as specified in ISO4871. Emission sound pressure levels are determined with the same frequency weighting and time weighting, or in the same frequency bands, as those for which sound power levels have been determined. NOTES The contents of this document and related International Standards are summarised in ISO11200:2014, Table1. At any given position in relation to a particular machine, and for given mounting and operating conditions, the emission sound pressure levels determined by the method of this International Standard will in general be lower than the directly measured sound pressure levels for the same machine in the typical workroom where it is used. This is due to reverberation and the contributions of other machines. A method of calculating the sound pressure levels in the vicinity of a machine operating alone in a workroom is given in ISO11690‑3. Commonly observed differences are 1dB to 5dB, but in extreme cases the difference may be even greater. 1.2 Types of noise and noise sources This International Standard is, in principle, applicable to moving or stationary machines, for indoor or outdoor use, particularly those machines which are mass-produced. The methods given in this International Standard are not applicable to highly directional sound sources used outdoors. This International Standard is particularly applicable to machines whose largest dimension is less than or equal to 1m. It is also applicable to larger machines in certain cases (see 6.2.3). This International Standard is applicable to all types of noise as defined in ISO12001 for which methods for determining the sound power level are available. 1.3 Test environment The test environment to be used is that which is specified for the determination of the sound power level in accordance with the International Standards of the ISO3740 or ISO9614 series. 1.4 Specified positions This International Standard is applicable to work stations and other specified positions in the vicinity of the source under test where emission sound pressure levels are to be determined. It is not applicable to work stations and other defined positions which are situated inside a cab or a cabin, or behind a screen. A work station can be a single point, corresponding to the specified position of a standing or seated operator. It can also be a specified path. NOTE3 More detailed specifications regarding seated, standing, stationary or moving operators, as well as Information concerning bystanders, are to be found in ISO11201. 1.5 Specific field of application of each method Specific information on the field of application of each of the two methods described in this International Standard is given in 6.2.2 and 6.2.3.
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