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
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IGIENAIR RHONE - ALPES

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COFRAC 1-6558 Bron, FR
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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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IHD LABORATORIO DE CALIBRACIÓN, S.L. (IHD LAB)

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ENAC LC10.228 Arganda del Rey, ES
UNE-EN 60942 UNE-EN 61672-3 UNE-EN 60804 UNE-EN 60651 UNE-EN 61252 + 1 more
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DIN EN ISO 5667-1 (A 4) DIN 38402-A 11 DIN 38402-A 12 DIN 38402-A 13 DIN ISO 5667-5 (A 14) + 3 more
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ILSA SPA

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ACCREDIA 01178 Arzignano, IT
UNI EN 17702-2 DIN EN 15476 ISO 14820-2 NF EN 13520 ISO 17704 EN 17703 + 2 more
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Temperaturanzeigegeräte –100 °C - Thermopaare, Thermoelemente Typ J, K und N für Widerstands- –100 °C - Direktanzeigende Thermometer + 3 more
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IMD Institut für Medizinische Diagnostik Berlin-Potsdam GbR IMD Berlin MVZ

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IMD Labor Oderland GmbH MVZ Ärztliches Labor Frank Berthold und Kollegen

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HbA1c Eosinophile, Basophile, MCV, MCH) Retikulozyten Urinsediment Elektrolyte (Kalium, Natrium, Chlorid) + 3 more
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IMPELAB

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COFRAC 1-6403 Marrakech, MA
DIN EN ISO 7932 DIN EN ISO 6579-1 DIN EN ISO 7937 DIN EN ISO 11290-1 0.95) based on BS ISO 21527-2:2008 + 2 more
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IMQ IBÉRICA, S.L. (Unipersonal)

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ENAC LE2135 Picanya, ES
DIN EN 61347-2-11 IEC 61347-2-11 IEC 61000-4-11: 2004 DIN EN 61347-2-13 ISO 7637-2 + 3 more
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ACCREDIA 00013 Milano, IT
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ACCREDIA 00529 Amaro, IT
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INDAM LABORATORI SrL a socio unico

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ACCREDIA 00060 Castel Mella, IT
DIN EN ISO 10705-2 ISO 11731 DIN EN 15634-1 ISO 15705 EPA 353.2 1993 + 3 more
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INDUSTRIAL LAB R. REIG

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SM 2120 SM 4500-Cl G UNE EN 27888 SM 4500-H+ B SM 2130 + 3 more
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INERCO INSPECCIÓN Y CONTROL

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UNE-EN 15259 UNE-EN 13284-1 UNE 77225 EPA 8 UNE 77227 + 3 more
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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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INGENIERIA ACUSTICA DEL CANTABRICO 2020, S.L. (Unipersonal) (ACUSTICAN)

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ENAC LE2742 Maliaño, ES
UNE-EN 1793-5 UNE-EN 1793-6
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INGURUMENA ADVANCED TECHNOLOGIES, S.L. (=imatek)

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ENAC LE2461 Zamudio, ES
UNE-EN ISO 16283-2 UNE-EN ISO 140-7 UNE-EN ISO 3382-2 UNE-EN ISO 16283-1 UNE-EN ISO 140-4
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INNONATION

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ACCREDIA 02189 Catania, IT
ETSI EN 319 412 ETSI EN 319 401 ETSI EN 319 411-2 ETSI EN 319 411-1
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INOVALYS - Site d'Angers

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COFRAC 1-5752 Angers Cedex 01, FR
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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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INOVALYS - Site de Tours

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COFRAC 1-7141 Parcay Meslay, FR
DIN EN ISO 17294-2 DIN EN ISO 14403-2 NF EN ISO 7887 – NF T 90-412 DIN EN ISO 7899-1 + 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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