scope:

1.1 General
This International Standard specifies a method for determining the emission sound pressure levels of
machinery or equipment, at a work station and at other specified positions nearby, in an essentially free field over a reflecting plane. A work station is occupied by an operator and may be located in open space, in the room where the source under test operates, in a cab fixed to the source under test, or in an enclosure remote from the source under test. One or more specified positions may be located in the vicinity of a work station, or in the vicinity of an attended or unattended machine. Such positions are sometimes referred to as bystander positions.
NOTE 1 Throughout the document the word "source under test" is used to represent either a machine or a piece of equipment.
Emission sound pressure levels are determined as A-weighted levels. Additionally levels in frequency bands and C-weighted peak emission sound pressure levels can be determined according to this International Standard, if required.
NOTE 2 The contents of the ISO 11200 series (ISO 11201 to ISO 11205) are summarized in ISO 11200.
With the method specified in this International Standard results of accuracy grade 1 (precision grade) or accuracy grade 2 (engineering grade) are obtained. Corrections are applied for background noise, but not for the acoustic environment. Instructions are given for the installation and operation of the source under test and for the choice of microphone positions for the work station and for other specified positions. One purpose of the measurements 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.
NOTE 3 The data obtained may also be used for the declaration and verification of emission sound pressure levels as specified in ISO 4871.
The inclusion of a method of accuracy grade 2 (engineering) which can be applied in typical in situ
environments is founded to comply with the first edition of ISO 11201. This method needs only to be used in cases, where the measurement of emission sound pressure levels with accuracy grade 2 (engineering) based on ISO 11201:1995 has been defined in machine specific noise test codes. In all other cases measurements with accuracy grade 2 (engineering) are carried out on the basis of ISO 11202, ISO 11204 or ISO 11205.