ISO 3747:2010

Sound Power Level — In-Situ Reference Source Method

This engineering/survey method determines sound power levels using a calibrated reference sound source to account for acoustic environmental conditions during in-situ measurements. It is particularly useful for large or immobile equipment where laboratory testing is impractical, and for on-site verification of noise compliance. The reference source approach compensates for acoustic environmental effects, improving accuracy compared to basic survey methods. Accreditation ensures proper reference source maintenance and measurement protocols are followed. This method is essential for field acceptance testing and environmental noise assessments.

What it measures

  • Sound power level (Lw) referenced to 1 pW
  • A-weighted and frequency-weighted sound power
  • Environmental acoustic correction factors
  • In-situ acoustic performance
🇩🇪 DIN EN ISO 3746 🇬🇧 BS EN ISO 3746 🇫🇷 NF EN ISO 3746 🇮🇹 UNI EN ISO 3746 🇪🇸 UNE EN ISO 3746 🇳🇱 NEN EN ISO 3746 🇩🇪 DIN EN ISO 9614-1 🇬🇧 BS EN ISO 9614-1 🇫🇷 NF EN ISO 9614-1 🇮🇹 UNI EN ISO 9614-1 🇪🇸 UNE EN ISO 9614-1 🇳🇱 NEN EN ISO 9614-1
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Industrieanlagen- Betriebsgesellschaft mit beschränkter Haftung Kalibrierlabor

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DIN EN ISO 9614-3 DIN EN ISO 11200 DIN EN ISO 11202 DIN EN ISO 11203 DIN EN ISO 11205 + 3 more
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Infraserv Höchst Segment Site Services

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DAkkS D-PL-14332-01-01 Frankfurt am Main, DE
DIN 38402-A 11 DIN 38402-A 12 DIN 38402-A 13 DIN ISO 5667-5 (A 14) DIN EN ISO 5667-6 (A 15) + 3 more
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Ingenieurbüro Kuntzsch

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IEC 61400-12-1 IEC 61400-50 IEC 61400-50-1 IEC 61400-50-2 ISO 9613-2
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DIN EN 61400-11 IEC 61400-11 Edition 3.0 IEC 61400-11 Edition 3.1
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ISO 17987-6 ISO 17987-7 ISO 16845
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Taupunkttemperatur Railway braking — urban guided transport Railway vehicle body structural requirem Railway bogies — wheelsets and bogies st Elektrische + 3 more
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UKAS 8401 Drighlington, GB
Appendix 5 of HSG 227 (2004))
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COFRAC 1-0101 Ecully Cedex, FR
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COFRAC 1-6585 Sainte Marie, FR
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COFRAC 1-1029 Meyreuil, FR
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COFRAC 1-5968 Merignac, FR
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Institut Technique des Gaz et de l'Air - ITGA - Site de Saint Etienne

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Institut Technique des Gaz et de l'Air - ITGA - Site de Saint Grégoire

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COFRAC 1-5967 Saint-Gregoire Cedex, FR
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Institut für Hygiene und Umwelt

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DAkkS D-PL-14095-03-02 Hamburg, DE
DIN 38402-A 12 DIN ISO 5667-5 (A 14) DIN EN ISO 5667-6 (A 15) DIN EN ISO 19458 (K 19) DIN 19643-1 + 3 more
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Basophile Granulozyten Eosinophile Granulozyten Erythrozyten Lymphozyten Leukozyten + 3 more
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Institut für Umwelt & Energie, Technik & Analytik e.V. (IUTA)

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Institute for International Product Safety

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Industries

Large industrial machinery and installation testing Environmental noise assessment and monitoring Building and construction equipment Transportation and railway noise evaluation Ventilation and HVAC system commissioning

Related Standards

  • ISO 3746 Determination of sound power levels of noise sources using sound pressure — Survey method
  • ISO 9614-1 Determination of sound power levels of noise sources by sound intensity — Part 1: Measurement at discrete points
  • ISO 12639 Acoustics — Reference sound sources for in-situ calibration of sound pressure and sound intensity measurement apparatus

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