ISO 3744:2010 PDF

Scope: This International Standard specifies methods for determining the sound power level or sound energy level of a noise source from sound pressure levels measured on a surface enveloping the noise source (machinery or equipment) in an environment that approximates to an acoustic free field near one or more reflecting planes. 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 or with A-weighting applied, is calculated using those measurements. NOTE Differently shaped measurement surfaces can yield differing estimates of the sound power level of a given noise source and an appropriately drafted noise test code (see ISO 12001) gives detailed information on the selection of the surface.

ISO 3744:2010 Referenced Document

IEC 60942:2003 Electroacoustics - Sound calibrators
IEC 61260:1995 Electroacoustics - Octave-band and fractional-octave-band filters
IEC 61672-1:2002 Electroacoustics - Sound level meters - Part 1: Specifications
ISO 12001:1996 Acoustics - Noise emitted by machinery and equipment - Rules for the drafting and presentation of a noise test code
ISO 3382-2 Acoustics - Measurement of room acoustic parameters - Part 2: Reverberation time in ordinary rooms; Technical Corrigendum 1
ISO 3745 Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound pressure — Precision methods for anechoic rooms and hemi-anechoic rooms — Amendment 1*， 2017-04-04 Update
ISO 5725 Precision of test methods; Determination of repeatability and reproducibility for a standard test method by inter-laboratory tests
ISO 6926 Acoustics — Requirements for the performance and calibration of reference sound sources used for the determination of sound power levels — Amendment 1*， 2020-11-23 Update
ISO/IEC Guide 98-3 Uncertainty of measurement - Guide to the expression of uncertainty in measurement (GUM:1995). Extension to any number of output quantities*， 2011-11-09 Update

2010 ISO 3744:2010 Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Engineering methods for an essentially free field over a reflecting plane
1994 ISO 3744:1994 Acoustics - Determination of sound power levels of noise sources using sound pressure - Engineering method in an essentially free field over a reflecting plane
1981 ISO 3744:1981 Acoustics; Determination of sound power levels of noise sources; Engineering methods for free-field conditions over a reflecting plane