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
1,868 Accredited labs
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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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Laboratoire Marocain de Métrologie Industrielle - L2MI

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COFRAC 1-6426 12 Et 14 Lot. Mauritania Q.I Sidi Bernoussi | - Casablanca | Maroc, MA
DIN EN 12469 NF S 90-351 BS EN ISO 14644-1:2015 ISO 14644-3
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PROCESS INSTRUMENTS (PI)

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COFRAC 1-5987 263, 3Eme Etage Zone Industrielle De Mohammedia | - Mohammedia | Maroc, MA
DIN EN 12469 NF S 90-351 BS EN ISO 14644-1:2015 ISO 14644-3
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REMINEX - CENTRE DE RECHERCHE

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COFRAC 1-0789 Reminex - Centre De Recherche - Bp 469 Marrakech Medina | - Marrakech | Maroc, MA
NF T 90-003 DIN EN 26777 DIN EN ISO 10523 DIN EN 846-7 DIN EN 25814 + 3 more
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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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