ISO 3743-1

Sound power — reverberation field engineering method

ISO 3743-1 specifies the reverberation room method for determining sound power levels of noise sources, suitable for smaller sources or laboratory environments where sound pressure is measured in a reverberant acoustic field. The method is applicable across a wide frequency range and is commonly used for equipment testing, product compliance assessment, and environmental noise impact studies. This engineering-level method balances accuracy with practical testing constraints and is widely required for EU noise directive compliance and product CE marking. Accreditation demonstrates laboratory control of environmental conditions, proper instrumentation calibration, and competence in complex acoustic data analysis.

What it measures

  • Sound power level (Lw) using sound pressure in reverberation room
  • A-weighted and frequency-weighted sound power
  • Octave band sound power levels (31.5 Hz to 8 kHz)
  • Sound power uncertainty and test environment correction
  • Directional sound power characteristics
🇩🇪 DIN EN ISO 3740 🇬🇧 BS EN ISO 3740 🇫🇷 NF EN ISO 3740 🇮🇹 UNI EN ISO 3740 🇪🇸 UNE EN ISO 3740 🇳🇱 NEN EN ISO 3740 🇩🇪 DIN EN ISO 3744 🇬🇧 BS EN ISO 3744 🇫🇷 NF EN ISO 3744 🇮🇹 UNI EN ISO 3744 🇪🇸 UNE EN ISO 3744 🇳🇱 NEN EN ISO 3744
1,868 Accredited labs
20 Countries

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FLASHLAB - Site d'Illkirch

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COFRAC 1-5765 Illkirch-Graffenstaden, FR
NF X 43-269 NF X 43-050 NF X43-050 (parties utiles de
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FLASHLAB - Site de Longjumeau

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COFRAC 1-5952 Longjumeau, FR
DIN EN 13001-1 NF X 43-269 NF X43-050 (parties utiles de NF X 43-275 NF X 43-257 + 3 more
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FLASHLAB NORD

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COFRAC 1-6979 Lezennes, FR
NF X 43-050 NF X 43-050 (parties utiles NF X 43-269 - Annexe
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FORGES DES ARDENNES ET DU NORD

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COFRAC 1-1428 Charleville-Mezieres, FR
DIN EN ISO 6508-1 ISO 18203 DIN EN ISO 6506-1 NF EN ISO 6892-1 (Méthodes A DIN EN ISO 1463 + 3 more
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FRAMATOME - Etablissement de Jeumont

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COFRAC 1-6523 Jeumont, FR
DIN EN ISO 6508-1 DIN EN ISO 3651-2 DIN EN ISO 4136 ISO 4969 DIN EN 10002-1 + 3 more
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COFRAC 1-6514 Saint-Marcel, FR
DIN EN ISO 6507-1 DIN EN ISO 643 NF EN ISO 6520-1 DIN EN ISO 17639 NF EN ISO 6520-2 + 3 more
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GINGER CEBTP

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COFRAC 1-0002 Elancourt, FR
DIN EN 1097-1 DIN EN ISO 10140-2 DIN EN 933-3 DIN EN 1097-2 DIN EN ISO 10140-4 + 3 more
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GINGER LECES

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COFRAC 1-7433 Saint-Julien-Les-Metz, FR
DIN EN 14385 ETSI EN 301 489-1 V2.2.3 2019-11 NF X43-551 IS EN 1948-1:2006 2006 DIN EN 14789 + 3 more
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GIP LABÉO - Site Eure

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COFRAC 1-6437 Évreux Cedex, FR
NF T 90-412 DIN EN ISO 7899-1 NF U47-101 DIN ISO 11465 DIN EN ISO 6888-2 + 3 more
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GIP LABÉO - Site Frank Duncombe

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COFRAC 1-5684 Saint-Contest, FR
DIN EN ISO 17294-2 DIN 51750-3 DIN EN ISO 14403-2 NF EN ISO 54321 et NF T 90-412 + 3 more
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GIP LABÉO - Site Manche

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COFRAC 1-6185 Saint-Lô Cedex, FR
DIN ISO 17289 NF X 31-615 ISO 15648 ISO BS EN 3727-1:2002 ASTM D 7238 + 3 more
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GIP PUBLICLABOS

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COFRAC 1-7404 Cahors, FR
DIN EN ISO 17294-2 DIN EN ISO 14403-2 NF T 90-412 DIN EN ISO 7899-1 VDE 414-9-11 + 3 more
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GRAND EST ANALYSES

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COFRAC 1-6977 Wintzenheim, FR
NF X 43-269 – Annexe K NF X 43-050 NF X43-050 (parties utiles de la
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HOP'LAB

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COFRAC 1-6221 Strasbourg, FR
NF X43-050 (parties utiles de NF X 43-050 NF X43-050 (parties utiles de la
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HYDRO BUILDING SYSTEMS FRANCE

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COFRAC 1-6233 Toulouse, 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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HYGIATECH DPA

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COFRAC 1-5565 Nanterre, FR
NF X 43-264 NF X 43-267 NF X 43-257 NF X 43-259 ISO 15202-1
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IANESCO

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COFRAC 1-6209 Poitiers, FR
DIN EN ISO 17294-2 ISO 7086-2:2000 DIN EN ISO 14403-2 DIN EN ISO 13395 NF T 90-412 + 3 more
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ICAR-CM2T

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COFRAC 1-1483 Moncel-Les-Luneville, FR
NF EN ISO 1927-3 NF EN ISO 1927-5 ASTM C 862 ASTM C 865 (DIN EN 61094-4:1996) + 3 more
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IFTS

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COFRAC 1-0847 Foulayronnes, FR
NF X 45-301 NF X 45-302 NF X 45-303 ASTM F795-88 NF P 90-319 de 02/2011 + 3 more
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IGIENAIR LORRAINE

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COFRAC 1-6747 Atton, FR
NF EN 12469 Annexe G NF S 90-351 NF EN 12469 Annexe D NF X 15-206 DIN EN 14175-4 + 3 more
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IGIENAIR RHONE - ALPES

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COFRAC 1-6558 Bron, FR
NF EN 12469 Annexe G NF EN 12469 Annexe H NF EN 12469 Annexe D DIN EN 14175-4 NF S 90-351 + 3 more
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IGIENAIR SUD EST

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COFRAC 1-6559 Aix-En-Provence, FR
NF EN 12469 Annexe G NF S 90-351 NF EN 12469 Annexe D NF X 15-206 DIN EN 14175-4 + 3 more
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INERIS

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COFRAC 1-0157 Verneuil En Halatte, FR
NF T 70-503 NF T 70-501 NF T 70-507 NF T 70-504 NF T 70-502 + 3 more
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INOVALYS - Site d'Angers

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COFRAC 1-5752 Angers Cedex 01, FR
NF U47-036-1 DIN EN ISO 14403-2 NF T 90-412 NF T90-350 DIN EN ISO 7899-1 + 3 more
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INOVALYS - Site de Nantes

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COFRAC 1-7140 Nantes Cedex 3, FR
NF V 05-116 NF V 04-415 NF V 04-407 NF V04-403 NF V04-401 + 3 more
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Industries

Power tool and equipment manufacturers Laboratory and medical device makers Small machinery producers Consumer electronics manufacturers Heating and ventilation equipment suppliers

Related Standards

  • ISO 3740 Acoustics — Determination of sound power levels of noise sources — General guidelines
  • ISO 3744 Acoustics — Determination of sound power levels of noise sources — Engineering method using an enveloping surface
  • ISO 354 Acoustics — Measurement of sound absorption coefficient in a reverberation room

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