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
1,670 Accredited labs
18 Countries

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UKAS 10460 Romford, GB
(HSG 248) – 2021 (PCM) based on HSG 248 DOC/002 based on HSG 248)
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Navobi

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RvA L486 Ermelo, NL
AM09 based on BS ISO 21527-1: 07L.1.11 based on ISO 5984:2002 DIN EN ISO 11290-2 ISO 4833-1 DIN EN ISO 8968-1 + 3 more
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ACCREDIA 00036 Biassono, IT
DIN EN 62368-1: 2016 DIN EN 61326-2-6 DIN EN 61010-2-101 EN IEC 62368-1 IEC 61326-2-6 + 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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UKAS 32076 Clervaux Terrace, GB
(HSG 264, 2012)
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DAkkS D-PL-17693-02-01 Hannover, DE
DIN EN ISO 15061 (D 34) DIN EN 27888 (C 8) DIN EN 1484 (H 3) ISO 5667-21 DIN 38404-C 10 + 3 more
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Normec DETS

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UKAS 2139 Consett, GB
BS 1377: Part 2: 1990 DIN EN 12457 No DETSC 5012 based on BS EN staining based on HSG 248. (HSG 248) – 2021 + 1 more
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Normec VRO

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RvA I203 Geldermalsen, NL
#EN ISO 5164:14 # EN 116-97 NEN 4400-1 # ISO 13736 #ISO 6618 + 3 more
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DAkkS D-K-18539-01-00 Falkensee, DE
Tensile testing of metallic materials (I positiver Überdruck -0,01 bar Absolutdruck p abs Taupunkttemperatur + 3 more
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DAkkS D-PL-21203-01-00 Ahaus, DE
DIN EN 13725:2003-07 und Berichtigung DIN EN 16841-1 DIN EN 16841-2 DIN EN 61400-11 DIN EN ISO 11200 + 1 more
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DAkkS D-K-15132-01-00 Oelde, DE
Akustik Übertragungsmaß von Messmikrofonen Messmikrofonen mit Dämpfung eines + 3 more
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UKAS 7691 Shotton, GB
(HSG 248) – 2021 NSDOC 47 based on HSG 248 staining based on HSG 248. (PCM) based on HSG 248
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Not One Iota

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UKAS 8998 Portadown, GB
(HSG 248) – 2021 SOP-12, based on HSG 248 staining based on HSG 248 (PCM) based on HSG 248
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UKAS 0573 Thurso, GB
AIR KERMA RATE AMBIENT DOSE HBs-Antigen (Hepatitis B-Surface RESPONSE: PERSONEL DOSE
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UKAS 0282 Harlow, GB
(HSG 264, 2012) Appendix 5 of HSG 227 (2004) (HSG 248) – 2021 (PCM) based on HSG 248
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ENAC LE2316 Pozuelo de Alarcón, ES
UNE-EN 14385 UNE-EN 15259 UNE-EN 13211 BS ISO 9096:2017 UNE 77216 + 3 more
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COFRAC 1-1964 Cesson-Sevigne, FR
DIN EN 13725:2003-07 und Berichtigung
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OHEC (uk)

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UKAS 0394 Prestwich, GB
(HSG 264, 2012) Appendix 5 of HSG 227 (2004))
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OHS

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UKAS 21882 Manchester, GB
(HSG 264, 2012)
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DAkkS D-K-15218-01-00 Friedrichsdorf (Taunus), DE
Druck 0,03 bar Absolutdruck Pabs > -0,3 bar > 3,0 bar > −0,02 bar + 3 more
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DAkkS D-K-20427-01-00 Lörrach, DE
− Wärmezähler Durchflusssensoren als Teilgeräte von Wärme- und Kältezählern: + 3 more
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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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DAkkS D-PL-12032-01-02 Hüllhorst, DE
IEC 61000-4-2: 2008 VDE 0847-4-2 IEC 61000-4-3: 2006 VDE 0847-4-3 IEC 61000-4-4: 2012 + 3 more
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UKAS 2769 Blyth, GB
IEC 61400-23 ASTM G73 (2012) IEC 60885-3, 2.4.1 IEC 60502-2 IEC 60840 + 3 more
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Olfasense

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RvA L403 Amsterdam, NL
DIN EN ISO 16911-1 ISO 10780 DIN EN 13725:2003-07 und Berichtigung AG2 and IS EN 15259:2007
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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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