BS EN ISO 3745:2012+A1:2017 specifies methods for measuring the sound pressure levels on a measurement surface enveloping a noise source (machinery or equipment) in an anechoic room or a hemi-anechoic room. The sound power level (or, in the case of impulsive or transient noise emission, the sound energy level) produced by the noise source, in frequency bands of width one-third octave or with frequency weighting A applied, is calculated using those measurements, including corrections to allow for any differences between the meteorological conditions at the time and place of the test and those corresponding to a reference characteristic acoustic impedance.

In general, the frequency range of interest includes the one-third-octave bands with mid-band frequencies from 100 Hz to 10 000 Hz. In practice, the range is extended or restricted to frequencies beyond or within these limits, to those between which the test room is qualified for the purposes of the measurements.


Cross References:
IEC 61672-1:2002
ISO 12001:1996
IEC 61260:1995
ISO/IEC Guide 98-3
ISO 26101:2017
ISO 5725
ISO 9613-1:1993
AMD 1:2001
IEC 60942:2003
IEC 61183
ISO 3743-1
ISO 80000-8:2007
ISO 140-3
IEC 61672-1
ISO 3741:2010
ISO 11690-1
TR 25417:2007
ISO 3746
ISO 11201
ISO 3747
ISO 6926
ISO 9614-1
ISO 9614-3
ISO 9614-2
ISO 7574-1
ISO 3744
ISO 4871
ISO 7574-4
ISO 7574-2
ISO 3743-2:2018
ISO 3740
ISO 7574-3


Incorporates the following:
Amendment, April 2018