ISO 3746:2010

Sound Power Level — Survey Method

This test determines sound power levels of noise sources using an enveloping measurement surface and sound pressure level measurements. It is a survey-grade method suitable for field measurements of machinery, equipment, and industrial sources in moderately reflective environments. The method is widely used for noise compliance verification, product development, and environmental impact assessments. Accredited testing ensures consistent, defensible results for regulatory compliance and product labeling. This method bridges the gap between laboratory-grade precision and practical field measurements.

What it measures

  • Sound power level (Lw) in decibels
  • A-weighted and frequency-weighted sound power
  • Directional sound power distribution
  • Acoustic performance of noise sources
🇩🇪 DIN EN ISO 3744 🇬🇧 BS EN ISO 3744 🇫🇷 NF EN ISO 3744 🇮🇹 UNI EN ISO 3744 🇪🇸 UNE EN ISO 3744 🇳🇱 NEN EN ISO 3744 🇩🇪 DIN EN ISO 3745 🇬🇧 BS EN ISO 3745 🇫🇷 NF EN ISO 3745 🇮🇹 UNI EN ISO 3745 🇪🇸 UNE EN ISO 3745 🇳🇱 NEN EN ISO 3745
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COFRAC 1-6449 Saint-Etienne-Du-Rouvray, FR
DIN ISO 17289 DIN EN ISO 10523 NF X 31-615 (Uniquement DIN EN ISO 7393-2 DIN EN 27888 + 1 more
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COFRAC 1-6446 Evry-Courcouronnes, FR
NF X 43-264 NF X 43-014 NF X 43-267 DIN EN ISO 15587-2 NF T90-111 + 3 more
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COFRAC 1-7056 Gennevilliers, FR
NF X 43-269 - Annexe K NF X43-050 (parties utiles de ISO 22262-1 NF X 43-050 NF ISO 22262-1 (parties utiles
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COFRAC 1-6452 Brive-La-Gaillarde, FR
DIN ISO 17289 DIN EN ISO 10523 NF X 31-615 (Uniquement DIN EN ISO 7393-2 DIN EN 27888 + 1 more
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COFRAC 1-6454 Toulouse, FR
NF X 43-269 NF X 43-269 - Annexe K NF X43-050 (parties utiles de ISO 22262-1 NF X 43-050 + 1 more
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COFRAC 1-1452 Colombes, FR
DIN EN ISO 17294-2 DIN EN ISO 13395 DIN EN ISO 10304-1 NF-T 90-029 ISO 5815-1 + 3 more
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COFRAC 1-0161 Cergy, FR
DIN EN ISO 21528-1 DIN 53483-2 DIN EN ISO 21528-2 DIN ISO 11665-4 DIN EN ISO 16649-3 + 3 more
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COFRAC 1-6746 Saint-Herblain, FR
ISO 18787 AM09 based on BS ISO 21527-1: DIN EN ISO 11290-1 NF V04-408 0.95) based on BS ISO 21527-2:2008 + 2 more
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COFRAC 1-0889 Fontaine, FR
DIN EN ISO 21528-1 NF V08-401 DIN EN ISO 21528-2 DIN EN ISO 6888-1 DIN EN ISO 6888-2 + 3 more
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COFRAC 1-7288 La Fleche, FR
DIN EN ISO 21528-1 DIN EN ISO 21528-2 DIN EN ISO 6888-1 DIN EN ISO 6888-2 DIN ISO 16649-2 + 3 more
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COFRAC 1-0869 Paris, FR
NF X 43-050 NF X 43-269 NF X 43-269 – Annexe K NF X43-050 (parties utiles de la DIN ISO 16000-3 + 3 more
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COFRAC 1-0824 Lisses, FR
DIN EN ISO 1833-13 DIN EN ISO 1833-14 DIN EN ISO 1833-16 DIN EN ISO 1833-17 DIN EN ISO 1833-18 + 3 more
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COFRAC 1-6879 Vitry Sur Seine, FR
ISO 13737 NF ISO 22286 ASTM D 2137 NF F19-503 NF T60-190 + 3 more
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COFRAC 1-0062 Les Ulis, FR
DIN EN ISO 10545-3 DIN EN 997 DIN EN ISO 10545-4 DIN EN ISO 10545-14 DIN EN ISO 10545-6 + 3 more
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COFRAC 1-0273 Dechy, FR
DIN EN 14385 NF X43-551 ETSI EN 301 489-1 V2.2.3 2019-11 DIN EN 13039 DIN EN ISO 21656 + 3 more
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COFRAC 1-7125 Guyancourt, FR
DIN EN 14385 ETSI EN 301 489-1 V2.2.3 2019-11 DIN EN ISO 21877 NF X 43-317 DIN EN 14181 + 3 more
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COFRAC 1-2383 Hombourg, FR
ISO 11737-3 DIN EN ISO 11737-2 NF EN 13824 (norme BS EN ISO 11737-1:2018
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COFRAC 1-1374 Thourotte, FR
DIN EN ISO 10140-1 DIN EN ISO 717-1 DIN EN ISO 10140-2 DIN EN ISO 10140-4 DIN EN ISO 10140-5
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STEARO

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COFRAC 1-7174 Velaux, FR
DIN EN 12469 NF S 90-351 BS EN ISO 14644-1:2015 ISO 14644-3
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COFRAC 1-1202 Gellainville, FR
NF T90-111 DIN EN ISO 17294-2 DIN EN ISO 14403-2 DIN EN ISO 11357-3 DIN EN ISO 10304-1 + 3 more
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COFRAC 1-0576 Sedan, FR
DIN EN ISO 717-2 DIN EN ISO 10140-3 DIN EN 1081 DIN EN ISO 105-B02 DIN EN ISO 9239-1 + 3 more
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COFRAC 1-5598 Crolles, FR
DIN ISO 16000-6 DIN ISO 16000-3 DIN EN ISO 16017-2 DIN EN 16339 DIN ISO 16000-4 + 3 more
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COFRAC 1-6125 Aurillac Cedex, FR
DIN EN ISO 17294-2 DIN EN ISO 14403-2 NF U47-105 NF T 90-412 DIN EN ISO 7899-1 + 3 more
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COFRAC 1-7302 Valence Cedex 9, FR
DIN EN ISO 14403-2 VDE 414-9-11 DIN ISO 11465 DIN EN ISO 10304-1 NF-T 90-029 + 3 more
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COFRAC 1-6123 Le Puy En Velay Cedex, FR
DIN EN ISO 13395 NF T 90-412 VDE 414-9-11 DIN EN ISO 7899-1 DIN EN ISO 10304-1 + 3 more
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Industries

Industrial machinery and equipment manufacturing Environmental noise consulting Construction and power tool equipment HVAC and ventilation systems Occupational health and safety

Related Standards

  • ISO 3744 Determination of sound power levels of noise sources using sound pressure — Precision method in anechoic and hemi-anechoic rooms
  • ISO 3745 Determination of sound power levels of noise sources using sound pressure — Precision grade method for anechoic rooms and free fields over a reflecting plane
  • ISO 3747 Determination of sound power levels of noise sources using sound intensity — In-situ method using a reference sound source
  • ISO 9614-1 Determination of sound power levels of noise sources by sound intensity — Part 1: Measurement at discrete points

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