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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COFRAC 1-6063 Chavanod, FR
NF ISO 22262-1 (parties utiles de la DIN EN 14346 NF ISO 22262-1 (parties utiles de NF X43-050 (parties utiles de la
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COFRAC 1-5749 Aspach-Le-Bas, FR
DIN ISO 17289 ISO 5667-9 (hors échant. DIN EN ISO 7027-2 NF X 31-615 (Uniquement DIN EN ISO 10523 + 3 more
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COFRAC 1-1678 Etupes, FR
NF X43-551 ETSI EN 301 489-1 V2.2.3 2019-11 NF X 44-052 DIN EN 13284-1 DIN EN 14385 + 3 more
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COFRAC 1-6837 Lievin, FR
DIN EN 14385 NF X43-551 ETSI EN 301 489-1 V2.2.3 2019-11 IS EN 1948-1:2006 2006 DIN EN 14789 + 3 more
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COFRAC 1-6986 Reims, FR
ISO 11607-1 ASTM F1886 BS EN ISO 11607-1:2020+A11 NF EN 868-5 annexe D ASTM F88 DIN EN 12758 + 3 more
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COFRAC 1-5951 Pierre Benite, FR
ISO 5815-1 EN 13087-2 ISO 15705 NF T90-015-1 DIN EN ISO 10523 + 3 more
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COFRAC 1-6871 Ronchin, FR
NF T90-111 DIN EN ISO 17294-2 NF T 90-412 DIN EN ISO 6888-1 DIN EN ISO 7899-1 + 3 more
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MICROLAB

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COFRAC 1-7470 Saint Pierre-La Reunion, FR
VDE 414-9-11 DIN EN ISO 10304-1 NF V08-059 DIN EN ISO 10272-2 BS ISO 15214:1998 + 3 more
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COFRAC 1-7500 Nanterre, FR
DIN EN 14511-2 DIN EN 14511-3 DIN EN 14511-4 DIN EN 14825 NF EN 16147
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NANO LABO

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COFRAC 1-6119 Fresnes, FR
NF X43-050 (parties utiles de NF X 46-032 DIN EN ISO 11885 NF X43-050 (parties utiles de la NF ISO 22262-1 (parties utiles + 1 more
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COFRAC 1-7442 Montbonnot Saint Martin, FR
NF T 90-412 DIN EN ISO 7899-1 DIN EN ISO 10304-1 DIN EN ISO 6888-2 NF V08-054 + 3 more
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COFRAC 1-0646 - Cergy Saint-Christophe, FR
DIN EN ISO 7932 DIN EN ISO 6888-1 ISO 15213-1 DIN ISO 16649-2 DIN EN ISO 6888-3 + 3 more
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COFRAC 1-1964 Cesson-Sevigne, FR
DIN EN 13725:2003-07 und Berichtigung
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COFRAC 1-5873 Bessines-Sur-Gartempe, FR
DIN EN ISO 11731 2019-03 EN 13087-2 NF T 90-043 NF-T 90-101 NF T90-015-1 + 3 more
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COFRAC 1-5809 Bruay La Buissiere, FR
DIN EN 27888 NF X 31-615 (Uniquement DIN EN ISO 10523
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PRELEVAIR

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COFRAC 1-5948 Cognac, FR
NF X 43-269 NF X 43-269 - Annexe K NF X43-050 (parties utiles de NF X 43-050 ISO 16000-7
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PRO' AIR

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COFRAC 1-5789 Montois-La-Montagne, FR
NF X 43-269 NF X 43-269 - Annexe K NF X43-050 (parties utiles de NF X 43-050 ISO 16000-7
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QUALIO

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COFRAC 1-7474 Besancon Cedex, FR
EN 13087-2 NF T 90-003 NF T90-015-1 NF T 90-107 DIN EN ISO 10523 + 3 more
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COFRAC 1-7303 Champdeniers, FR
ISO 13320 VDE 414-9-11 NF V08-250 ISO 19343 DIN EN ISO 7899-1 + 3 more
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COFRAC 1-1523 Boissy-Saint-Leger, FR
DIN EN ISO 6507-1 DIN EN ISO 6508-1 NF X70-100-1 DIN EN 45545-2 NF X70-100-2 + 3 more
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COFRAC 1-5058 Pierre Percee, FR
DIN EN 27888 NF X 31-615 (Uniquement DIN EN ISO 10523
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COFRAC 1-0618 Le Bourget Du Lac Cedex, FR
NF X 31 615 (purge DIN ISO 17289 ISO 5815-1 EN 13087-2 DIN EN ISO 7027-2 + 3 more
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COFRAC 1-7502 Bonneville, FR
NF T 90-412 NF T90-350 DIN EN ISO 7899-1 DIN EN 12880 NF X 31-615 + 3 more
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COFRAC 1-0162 Paris, FR
DIN EN ISO 12966-2 DIN EN 12266-2 DIN EN ISO 12966-4 DIN EN 13656 DIN 30660 + 3 more
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COFRAC 1-5966 Toulouse Cedex, FR
CEI 61827 NF S31-190 2008-03 : ISO 20906 : 2009-12 :
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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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