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 1-0273 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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ST GOBAIN GLASS France - Saint-Gobain Research Compiègne

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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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Systèmes Produits et Analyses Chimiques (SYPAC)

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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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TARKETT France

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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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TERA-environnement (Laboratoire de Crolles)

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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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TERANA CANTAL

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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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TERANA DROME

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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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TERANA HAUTE LOIRE

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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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TERANA NIEVRE

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COFRAC 1-6949 Nevers Cedex, FR
DIN EN ISO 17294-2 NF T 90-412 DIN EN ISO 10304-1 NF X 31-615 ISO 5815-1 + 3 more
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TERANA PUY-DE-DOME

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COFRAC 1-6120 Lempdes, FR
NF T 90-412 NF U47-101 DIN EN ISO 7899-1 DIN ISO 16649-2 DIN EN ISO 6888-2 + 3 more
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TOXILABO

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COFRAC 1-1941 Nantes, FR
NF ISO 21438-3 NF X 43-264 NF ISO 21438-1 ISO 16200-2 NF ISO 21438-2 + 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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