DIN EN ISO 3745-2009 声学,噪声源声功率级的测定.消声室和半声室精密测定(ISO 3745:2003),德文版本 EN ISO 3745:2009
Acoustics - Determination of sound power levels of noise sources using sound pressure - Precision methods for anechoic and hemi-anechoic rooms (ISO 3745:2003); English version of DIN EN ISO 3745:2009-11
This International Standard specifies methods for measuring the sound pressure levels on a measurement
surface enveloping a noise source in anechoic and hemi-anechoic rooms, in order to determine the sound
power level or sound energy level produced by the noise source. It gives requirements for the test
environment and instrumentation, as well as techniques for obtaining the surface sound pressure level from
which the sound power level or sound energy level is calculated, leading to results which have a grade 1
accuracy.
The methods specified in this International Standard are suitable for measurements of all types of noise.
The noise source can be a device, machine, component or sub-assembly. The maximum size of the source
under test depends on the radius of the hypothetical sphere (or hemisphere) used as the enveloping
measurement surface.