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 ISO 4871.
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.