scope:

This standard specifies methods for determining the emission sound pressure levels at the work station and at other specified positions in the vicinity of machinery and equipment from the sound power level. In general, these sound pressure levels are different from those that would be observed when the machinery or equipment is operating in its normal surroundings where the environment may influence the emission sound pressure level. This standard prescribes two methods for determining the emission sound pressure levels of machinery and equipment, at work stations 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. This 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 Standard are not applicable to highly directional sound sources used outdoors.