ISO 3746:2010

Sound Power Level — Survey Method

This test determines sound power levels of noise sources using an enveloping measurement surface and sound pressure level measurements. It is a survey-grade method suitable for field measurements of machinery, equipment, and industrial sources in moderately reflective environments. The method is widely used for noise compliance verification, product development, and environmental impact assessments. Accredited testing ensures consistent, defensible results for regulatory compliance and product labeling. This method bridges the gap between laboratory-grade precision and practical field measurements.

What it measures

  • Sound power level (Lw) in decibels
  • A-weighted and frequency-weighted sound power
  • Directional sound power distribution
  • Acoustic performance of noise sources
🇩🇪 DIN EN ISO 3744 🇬🇧 BS EN ISO 3744 🇫🇷 NF EN ISO 3744 🇮🇹 UNI EN ISO 3744 🇪🇸 UNE EN ISO 3744 🇳🇱 NEN EN ISO 3744 🇩🇪 DIN EN ISO 3745 🇬🇧 BS EN ISO 3745 🇫🇷 NF EN ISO 3745 🇮🇹 UNI EN ISO 3745 🇪🇸 UNE EN ISO 3745 🇳🇱 NEN EN ISO 3745
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Endolab Mechanical Engineering

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DAkkS D-PL-18838-02-01 Riedering, DE
DIN EN ISO 14607 DIN EN 13687-2 DIN EN ISO 15912 ASTM E290-22 DIN EN ISO 19023 + 3 more
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Endress+Hauser (Deutschland) GmbH+

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DAkkS D-K-19095-01-00 Weil am Rhein, DE
Railway brake — magnetic track brakes (U Railway brakes — conditions for homologa − Durchfluss von Flüssigkeiten Railway brakes — estimation of braking f − Masse strömender Flüssigkeiten + 3 more
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Endress+Hauser SE+

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DAkkS D-PL-15172-01-00 Maulburg, DE
IEC 61000-4-2: 2008 IEC 61000-4-3: 2006 IEC 61000-4-4: 2012 IEC 61000-4-5: 2005 IEC 61000-4-6: 2013 + 3 more
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Enertek International

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UKAS 9141 Sutton Fields, GB
DIN EN 12279 DIN EN 12278 -22018G/A, rs182549 DIN EN 303-2 DIN EN 15502-2-1 + 3 more
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Enquin Environmental

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UKAS 2604 Wentloog, GB
(HSG 248) – 2021 (Section 2) based on HSG 248 (Section 4) based on HSG 248 staining based on HSG 248 (HSG 264, 2012) + 3 more
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Entwicklungs- und Prüflabor Holztechnologie

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DAkkS D-PL-11054-01-00 Dresden, DE
CDC73 (NM_000384: c.1-c.82) ID152 EN ISO 11925-2 DIN EN 350 + 3 more
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Enviraz Surveys

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UKAS 0441 Glasgow, GB
HSG 264 (2012) and Appx. 3 of (HSG 264, 2012) HSG 227 (2004)) Appendix 5 of HSG 227 (2004))
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Envirocare Midlands

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UKAS 1755 Redditch, GB
(HSG 248) – 2021 SOP/11, based on HSG 248 (PCM) based on HSG 248
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Envirochem Analytical Laboratories

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UKAS 1227 Fareham, GB
(HSG 248) – 2021 DIN EN 12457-2 3.02 based on HSG 248 staining based on HSG 248. (PCM) based on HSG 248
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Envirolab

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UKAS 1247 Hattersley, GB
(HSG 248) – 2021 (PCM) based on HSG 248
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Environmental Compliance

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UKAS 2499 Pontypridd, GB
requirements of BS EN 15259:2007 DIN EN 14181 DIN EN 13126-19 DIN EN 15058 DIN EN 14789 + 3 more
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Environmental Essentials

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UKAS 2719 Cannel Row, GB
(HSG 248) – 2021 TP003 based on HSG 248 (PCM) based on HSG 248 TP002 based on HSG 248 Appendix 5 of HSG 227 (2004) + 1 more
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Environmental Inspection

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UKAS 27551 Crook, GB
(HSG 264, 2012)
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Environmental Management Solutions

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UKAS 4238 Hereford, GB
Appendix 5 of HSG 227 (2004) (HSG 264, 2012)
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Environmental Services

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UKAS 2099 Exeter, GB
(HSG 248) – 2021 (PCM) based on HSG 248 SP1 based on HSG 248
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Environmental and Site Safety Solutions

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UKAS 9608 Basildon, GB
(HSG 264, 2012) and Appx. 3 of HSG 227 (2004)) Executive guides HSG 264 (2012)
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Environtec

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UKAS 2030 Chelmsford, GB
(HSG 248) – 2021 (PCM) based on HSG 248 staining based on HSG 248
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Envirosafe Testing

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UKAS 28785 Wolverhampton, GB
(HSG 248) – 2021 SOP 3 based on HSG 248 (PCM) based on HSG 248
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Erichsen Gesellschaft mit beschränkter Haftung & Co. Kommanditgesellschaft

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DAkkS D-K-21247-01-01 Hemer, DE
Innen- und Tiefenmaße Konventioneller 0,11 G > 2 G > 5 g + 3 more
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Esders

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DAkkS D-K-23123-01-01 Haselünne, DE
Absolutdruck Pabs Druck 0,35 bar > 19 bar Überdruck p 0,35 bar
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Esenwein

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DAkkS D-K-15168-01-00 Hochdorf, DE
/ Messgeräte > 220 mV Quellen > 0,2 V 120 V 200 V + 3 more
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Essex Asbestos Testing

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UKAS 8007 Corringham, GB
(HSG 248) – 2021 (PCM) based on HSG 248 TP03 based on HSG 248
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Eton Environmental Group

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UKAS 2734 Darlington, GB
(HSG 248) – 2021 TP005, based on HSG 248 (PCM) based on HSG 248
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Eurac Research - Istituto per le Energie Rinnovabilii

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ACCREDIA 01546 Bolzano, IT
IEC 61215-1-1 DIN EN 16147 DIN EN 14511-3 DIN EN ISO 10077-1 DIN EN 14511-4 + 3 more
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Eurofins Chemtest

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UKAS 2183 Newmarket, GB
staining based on HSG 248. (PCM) based on HSG 248 (HSG 248) – 2021 DIN EN 12457-2 DIN EN 12457-3
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Industries

Industrial machinery and equipment manufacturing Environmental noise consulting Construction and power tool equipment HVAC and ventilation systems Occupational health and safety

Related Standards

  • ISO 3744 Determination of sound power levels of noise sources using sound pressure — Precision method in anechoic and hemi-anechoic rooms
  • ISO 3745 Determination of sound power levels of noise sources using sound pressure — Precision grade method for anechoic rooms and free fields over a reflecting plane
  • ISO 3747 Determination of sound power levels of noise sources using sound intensity — In-situ method using a reference sound source
  • ISO 9614-1 Determination of sound power levels of noise sources by sound intensity — Part 1: Measurement at discrete points

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