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
1,670 Accredited labs
18 Countries

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COFRAC 1-6996 Santeny, FR
NF T90-004 NF-T 90-029
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COFRAC 1-1861 Rungis, FR
DIN EN 12390-6 DIN EN 196-2 DIN EN 62196-1: 2015 DIN EN 12390-3 ISO 13320 + 3 more
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DSSF

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COFRAC 1-0301 Marne La Vallee Cedex 2, FR
NF P 92-501 NF P92-512 EN 13823 EN ISO 1716 NF P 92-504 + 3 more
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COFRAC 1-0552 Grenoble Cedex 09, FR
BS EN ISO 1924-2:2008 DIN EN ISO 1974 DIN EN 12758 BS EN ISO 12625-4:2022 ISO 535 + 3 more
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COFRAC 1-0979 Bobigny, FR
NF X 31-615 (Uniquement NF X 43-257 NF X 43-259 DIN EN 27888 DIN EN ISO 10523 + 3 more
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COFRAC 1-1209 Garons, FR
DIN EN 1988-1 DIN EN ISO 17294-2 NF T 90-412 DIN EN ISO 7899-1 DIN EN ISO 10304-1 + 3 more
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COFRAC 1-0894 Lieu Saint-Amand, FR
NF V 04-407 NF T 90-412 DIN EN ISO 6888-1 NF V04-403 NF V04-408 + 3 more
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COFRAC 1-5697 Aix-En-Provence, FR
DIN EN 12593 DIN EN 1097-4 DIN EN 933-1 DIN EN 12607-1 DIN EN 1427 + 3 more
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COFRAC 1-5706 Toulouse, FR
DIN EN 12390-6 DIN EN 62196-1: 2015 DIN EN 12390-3 NF P 98-532 NF P 98-533 + 3 more
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CERIB

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COFRAC 1-0001 Epernon, FR
ISO 8302 DIN EN 12664 DIN EN 12667 DIN EN 16272-5 DIN EN 1793-5 + 3 more
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COFRAC 1-0064 Saint-Marcel, FR
DIN EN 1254-2 DIN EN 1254-3 DIN EN 1254-5 DIN EN 12101-10 BS EN 50291-1:2018 + 3 more
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COFRAC 1-6553 Senlis, FR
NF X 43-264 NF X 43-267 ISO 16200-1 DIN EN 14385 NF X43-551 + 3 more
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COFRAC 1-0097 Charleville-Mezieres, FR
DIN EN ISO 6508-1 ASTM E8/E 8M DIN EN ISO 643 EN ISO 12624 ISO 4967 + 3 more
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COFRAC 1-1570 Chatellerault, FR
EN 13819-2:2020 DIN 53521 DIN EN 13522 DIN 45635-23 Sizing, Range of fitting, Resistance to + 3 more
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CSTB - BV

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COFRAC 1-0300 Marne La Vallee Cedex 2, FR
DIN EN 947 DIN CEN TS 15119-2 NF P 20-501 DIN EN 1026 BS EN 14351-1:2006+A2:2016 + 3 more
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COFRAC 1-1542 Saint Martin D'Heres, FR
DIN EN 1279-2 DIN EN 1279-5 DIN EN 12094-10 EN 1279-6 – Méthode de référence DIN EN 14449 + 3 more
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CTC

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COFRAC 1-0130 Lyon Cedex 07, FR
DIN EN 27888 DIN EN ISO 10523 NF X 31-615 (Uniquement prélèvements NF EN ISO 7887 Méthode D DIN EN ISO 9963-1 + 3 more
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COFRAC 1-1970 Chateauneuf Sur Isere, FR
DIN EN 12207 DIN EN 12208 DIN EN 1026 DIN EN 12210 BS EN 14351-1:2006+A2:2016 + 3 more
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COFRAC 1-7055 Nice, FR
DIN EN ISO 17294-2 DIN EN ISO 7899-1 ISO 5815-1 NF T90-015-1 DIN EN ISO 10523 + 3 more
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COFRAC 1-7175 Oullins-Pierre-Bénite, FR
NF ISO 21438-3 NF X 43-264 NF ISO 21438-1 NF X 43-259 NF ISO 21438-2 + 3 more
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ELANOVA LAB

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COFRAC 1-0076 Vitry-Sur-Seine, FR
DIN ISO 1817 DIN EN 15188 DIN ISO 1431-1 DIN EN 14671 DIN EN ISO 10140-2 + 3 more
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COFRAC 1-1147 Sainte-Croix-En-Plaine, FR
DIN EN ISO 6888-1 0.95) based on BS ISO 21527-2:2008 DIN EN ISO 6888-2 DIN ISO 16649-2 DIN EN ISO 19020 + 3 more
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COFRAC 1-1488 Saverne, FR
DIN EN ISO 14403-2 DIN ISO 11464 DIN ISO 11465 NF T90-105-2 NF T90-004 + 3 more
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COFRAC 1-0685 Maxeville, FR
DIN ISO 17289 NF X 31-615 DIN EN ISO 7027-2 DIN EN ISO 10523 DIN EN ISO 7393-2 + 3 more
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COFRAC 1-2202 Douai, FR
NF T90-111 DIN EN ISO 14403-2 NF T 90-412 DIN EN ISO 7899-1 NF-T 90-029 + 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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