BS EN ISO 3741:2010 Acoustics. Determination of sound power levels and sound energy levels of noise sources using sound pressure. Precision methods for reverberation test rooms
This International Standard specifies methods for determining the sound power level or sound energy level of
a noise source from sound pressure levels measured in a reverberation test room. The sound power level
(or, in the case of noise bursts or transient noise emission, the sound energy level) produced by the noise
source, in frequency bands of width one-third-octave, 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 impedance. Measurement and calculation procedures
are given for both a direct method and a comparison method of determining the sound power level and the
sound energy level.
In general, the frequency range of interest includes the one-third-octave bands with mid-band frequencies
from 100 Hz to 10 000 Hz. Guidelines for the application of the specified methods over an extended frequency
range in respect to lower frequencies are given in Annex E. This International Standard is not applicable to
frequency ranges above the 10 000 Hz one-third-octave band.
NOTE For higher frequencies, the methods specified in ISO 9295 can be used.
BS EN ISO 3741:2010 history
2010BS EN ISO 3741:2010 Acoustics. Determination of sound power levels and sound energy levels of noise sources using sound pressure. Precision methods for reverberation test rooms