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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COFRAC 1-2193 Bourg-En-Bresse Cedex 9, FR
DIN EN ISO 17604 NF V08-401 0.95) based on BS ISO 21527-2:2008 DIN EN ISO 6888-2 DIN ISO 16649-2 + 3 more
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COFRAC 1-1405 Cergy, FR
NF T 90-412 DIN EN ISO 7899-1 VDE 414-9-11 DIN EN ISO 10304-1 ISO 5815-1 + 3 more
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LDH Kalibrierservice

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DAkkS D-K-18673-01-01 Dresden, DE
Gleichspannung 1 mV bis 10 mV Messgeräte > 10 mV bis 100 mV > 100 mV bis 220 mV > 220 mV bis 2,2 V > 2,2 V bis 11 V + 3 more
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LEGNOLEGNO S.C.

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ACCREDIA 01379 Correggio, IT
DIN EN ISO 10140-2 DIN EN ISO 10077-1 DIN EN ISO 10077-2 DIN EN ISO 717-1 DIN EN 12208 + 3 more
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LEPBI - Laboratoire d'Expertise des Polluants du Bâtiment et de l'Industrie

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COFRAC 1-2350 Villepinte, FR
NF X 43-269 DIN 51750-3 NF X 46-032 NF EN 15934 – NF X 43-269 – Annexe K + 3 more
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LEnviroS Srl

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ACCREDIA 01347 Molfetta, IT
DIN EN 13725:2003-07 und Berichtigung
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DIN 4150-1 DIN 4150-2 DIN 4150-3 DIN 45645-2 DIN ISO 12884 + 3 more
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ENAC LE894 Bellaterra, ES
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UKAS 0423 Guildford, GB
CHEMICAL ASTM D4052 (Digital density
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COFRAC 1-1610 Papeete (Tahiti), PF
NF T 90-412 DIN EN ISO 21528-2 DIN EN ISO 7899-1 DIN EN ISO 10304-1 DIN ISO 16649-2 + 3 more
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COFRAC 1-0053 Gonfreville L'Orcher, FR
NF EN ISO 6892-1 Méthode B DIN EN ISO 6508-1 ISO 4969 DIN EN 10002-1 DIN EN ISO 643 + 3 more
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LIDAL

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COFRAC 1-0600 Annecy, FR
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COFRAC 1-0606 Trappes Cedex, FR
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ACCREDIA 01448 Udine, IT
DIN EN 16841-1 UNI 7133-3 DIN EN 13725:2003-07 und Berichtigung
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RvA I081 Rotterdam, NL
NEN 3650-2 NEN 3650-1 NEN 3650-3 NEN 3651 NPR 3659
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COFRAC 1-1531 Venissieux, FR
ISO 15202-3 NF X43-551 NF X 43-317 NF X 43-294 (juin DIN EN ISO 16017-2 + 3 more
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DIN EN 13040 DIN EN 12580 DIN EN 13039 DIN EN 13037 DIN EN 13038 + 3 more
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UKAS 4701 Pencoed, GB
DIN EN 13032-4 BS EN ISO 13032-1 +A1:2012 IEC 62612 ed1.0 (2013-06) IEC 62722-1 ed1.0 (2014-09) IEC 62722-2-1 ed1.0 (2014-11) + 3 more
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COFRAC 1-0641 Digne Les Bains Cedex, FR
DIN EN ISO 17604 DIN EN ISO 6888-1 DIN EN ISO 6888-2 DIN ISO 16649-2 BS ISO 15214:1998 + 3 more
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La Patrie srl

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ACCREDIA 02283 Ponte a Egola - San Miniato, IT
DIN EN 13520 DIN EN 1010-5 DIN EN 1570-1 DIN EN ISO 17228 DIN EN ISO 11640
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Thrombozytenfunktionstest 5-Hydroxyindolessigsäure Amiodaron, Desethylamiodaron Tricyclische Antidepressiva Kohlenhydratdefizientes + 3 more
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Thrombozytenaggregation a-Hexachlorcyclohexan 2-Butanon Aceton Benzol + 3 more
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DAkkS D-ML-13272-01-00 München, DE
Drogenscreening-Qualitativer Anti-HCV-Bestätigungstest Benzodiazepine, Kokain, Opiate, Buprenor Organische Säuren Neuroleptika, Antidepressiva + 3 more
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Labor Berlin - Charité Vivantes

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Thrombozytenaggregation (ADP, ASPI, TRAP) Oligosaccharide Aceton Ethanol + 3 more
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Labor Berlin - Charité Vivantes Services

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Thrombozytenaggregation (ADP, ASPI, TRAP) Oligosaccharide Aceton Ethanol + 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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