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ASA/ANSI S12.55-2012 / ISO 3745:2012 (R2026)

Acoustics - Determination of sound power levels of noise sources using sound pressure – Precision methods for anechoic and hemi-anechoic rooms (a nationally adopted international standard)
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This American National Standard 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.
SDO ASA: Acoustical Society of America
Document Number S12.55
Publication Date Sept. 1, 2026
Language en - English
Page Count 90
Revision Level
Supercedes
Committee
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