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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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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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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HaBu Hauck Prüftechnik

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DAkkS D-K-17344-01-01 Hochdorf-Assenheim, DE
Härte *) 20 HRA Härtevergleichsplatten 20 HRB nach Rockwell Verfahren 20 HRC 40 HRD 60 HRF + 3 more
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Hampshire Scientific Service

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UKAS 0024 Southsea, GB
(HSG 248) - 2021 ASB/SOP/OM8 based on HSG 248 ASB/SOP/OM6 based on HSG 248 DIN EN 12697-11 on BS 4401:Part 3:1970(1986) + 3 more
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Hann Tucker Associates

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UKAS 4083 Woking, GB
ISO 7171 ISO 1407 BS EN ISO 140-4:1998 BS EN ISO 717-2:2020
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Hartford Steam Boiler UK

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UKAS 8452 Manchester, GB
BS 2790 - Specification for the design a BS 1113 - Specification for the design a BS EN 13480 Parts 1 to 8 - Metallic EN 13445 – Parts 1 to 10 Unfired pressur BS EN ISO 15614 and ASME IX + 3 more
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Harzklinikum Dorothea Christiane Erxleben GmbH Zentrum für Laboratoriumsdiagnostik

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automatische Zelldifferenzierung Erythrozyten Leukozyten Retikulozyten Thrombozyten + 3 more
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Hayes McKenzie Partnership

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UKAS 9452 Whaddon, GB
DIN EN 61400-11 IEC 61400-11:2012/ AMD:2018
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Healthy Abode

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UKAS 10263 Harlow, GB
ISO 7171 BS EN ISO 140-4:1998 BS EN ISO 16283-1:2014+A1:2017BS EN ISO BS EN ISO 16283-2:2020 HTM 08-01 - 2013 + 2 more
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Healthy Buildings (Ireland) Ltd

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UKAS 4659 Newry, GB
(HSG 264, 2012) and Appx. 3 of HSG 227 (2004)) Executive guides HSG 264 (2012)
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Hegewald & Peschke, Meß- und Prüftechnik

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DAkkS D-K-17222-01-01 Nossen, DE
Kraft (WPM) Werkstoffprüfmaschinen Acoustics — tonality assessment (DIN 456 messeinrichtungen von Härte (WPM) 30 HBW + 3 more
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Hensel Mess-, Regel- und Prüftechnik

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DAkkS D-K-15122-01-00 Cunewalde, DE
Absolutdruck p abs > 41 bar Negativer und positiver Überdruck + 3 more
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Heywood Williams Components

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UKAS 9868 Daventry, GB
DIN EN 1026 DIN EN 12046-2 BS 6375-1:2015 + A1:2016 and the DIN EN 1027 DIN EN 1629 + 3 more
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Hohenstein Laboratories

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DAkkS D-PL-12083-01-04 Bönnigheim, DE
DIN 53160 DIN 54034 DIN 54056 DIN EN 20105-A02 DIN EN 20105-N01 + 3 more
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UKAS 24561 Hertford, GB
(HSG 264, 2012)
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Hoppesack Mess- und Regeltechnik Vertriebs

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DAkkS D-K-15198-01-00 Hanau, DE
Taupunkttemperatur thermometer, -80 °C bis Railway braking — urban guided transport > -35 °C bis Temperatur- −35 °C bis + 3 more
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Horiba Europe GmbH Labor für Fahrzeugprüftechnik

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DAkkS D-K-12094-01-02 Darmstadt, DE
–1 bar Positiver und negativer Positiver Überdruck p e > 0,0 bar Absolutdruck p abs 0,25 bar + 3 more
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Hottinger Brüel & Kjaer

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DAkkS D-K-12029-02-02 Darmstadt, DE
Übertragungsmaß von Messmikrofonen oder Freifeld-Leerlauf- 20 Hz Freifeld -Übertragungsmaß Vorverstärker, nach IEC + 3 more
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Hydrodata

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DAkkS D-PL-18139-01-00 Oberursel, DE
DIN EN ISO 5667-1 (A 4) DIN 38402-A 12 DIN 38402-A 13 DIN 38402-A 15 DIN EN ISO 5667-3 (A 21) + 3 more
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DAkkS D-K-15045-01-01 Limburg a. d. Lahn, DE
Negativer und Positiver Überdruck p e > 0,015 bar Überdruck p (ein- oder mehrgängige + 3 more
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HygCen Germany

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DAkkS D-PL-18818-02-02 Schwerin, DE
DIN EN ISO 10993-1 DIN EN ISO 10993-5 DIN EN ISO 17405 ISO 10993-23 DIN EN ISO 10993-18 + 3 more
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Hygiene Nord

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DAkkS D-PL-18411-01-04 Greifswald, DE
DIN EN ISO 10993-5 DIN EN ISO 10993-1 DIN EN ISO 11737-2 DIN EN 1040 DIN EN IEC 60601-2-75 + 3 more
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Häfner Gewichte GmbH MASSCAL - Kalibrierlaboratorium

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Innen- und Tiefenmaße Konventioneller Wägewert/ Massenormale Festkörpervolumen + 3 more
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I17-Wind

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DAkkS D-PL-21268-01-00 Husum, DE
ISO 9613-2
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I2 Analytical

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UKAS 4041 Croxley Green, GB
staining based on HSG 248. (HSG 248) – 2021 (PCM) based on HSG 248 A007B based on BS EN15051-2:2013 +1:2016 DIN EN 12457-3 + 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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