This test method covers the measurement of outdoor sound levels
at specific locations using a digital statistical sound analysis
system and a formal measurement plan.
This test method provides basic requirements for obtaining
either a single set of data or multiple sets of related data.
However, because there are numerous circumstances and varied
objectives requiring multiple sets of data, the test method does
not address planning of the measurement program.
The use of results of measurements performed using this test
method include, but are not limited to, the following:
To characterize the acoustical environment of a site,
To characterize the sound emissions of a specific sound source
which exhibits a temporal variation in sound output, and
To monitor the effectiveness of a noise impact mitigation
This test method is intended to be used in conjunction with a
measurement plan that references this test method. Changes or
additions to the provisions of this test method shall be clearly
stated in the plan.
In the event it is necessary, for example, because of time
constraints, to conduct measurements without first formalizing a
plan, this test method can be used if an operator/ observer whose
qualifications are satisfactory to both the performing organization
and the client is present at all times during the measurements and
who complies, to the extent possible, with all the applicable
requirements of this test method, including record keeping.
The data obtained using this test method enable comparison of
sound level data with appropriate criteria.
The data obtained with this test method can be used in the
derivation of loudness levels provided the necessary requirements
regarding sample duration and signal bandwidth are observed in
collecting the data. It is recommended that a specialist in the
area of loudness evaluation be consulted in preparing a plan for
measurements intended to produce data which will be used for this
The values stated in SI units are to be regarded as standard. No
other units of measurement are included in this standard.
This standard does not purport to address all of the safety
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.
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