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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Universitätsmedizin der Johannes Gutenberg-Universität Mainz Institut für Klinische Chemie und Laboratoriumsmedizin

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VALEO ELECTRIFICATION - Laboratoire d'essais et de validations

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COFRAC 1-6561 Sainte-Florine, FR
ISO 16750-3 IEC 60068-2-80) IEC 60068-2-53 limitée à : IEC 60068-2-14 fait IEC 60068-2-1 et + 3 more
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VDE Prüf- und Zertifizierungsinstitut

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DAkkS D-PL-12061-01-01 Offenbach am Main, DE
IEC 60061-1 IEC 60061-2 IEC 60238 IEC 61184 IEC 60400 + 3 more
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VEGA Environmental Consultants

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UKAS 1634 Whitley Bay, GB
(HSG 248) – 2021 ASB/10 based on HSG 248 (PCM) based on HSG 248 ASB/6 based on HSG 248 BS EN ISO 14644-1:2015 + 3 more
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VERIFICACIONES INDUSTRIALES DE ANDALUCIA, S.A. (VEIASA)

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ENAC LC10.112 Sevilla, ES
UNE-EN 60942 UNE-EN 61672-3 UNE 82503 UNE-EN 60804 UNE 20942 + 3 more
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VERIFICACIONES Y CERTIFICACIONES TÉCNICAS

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ENAC LE2110 Castellón de la Plana, ES
UNE-EN ISO 16283-1 UNE-EN ISO 16283-3
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ENAC LC10.251 Hospitalet de Llobregat, ES
CEM ME009
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VHT Institut für Leichtbau Trockenbau Holzbau

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Myopathie, Nemaline (TyP1, 3-10: ASTM E 23-18 ASTM D 1322 Toxizität UGT1A1-Gen rs3064744, rs414832 DIN EN 1789 + 3 more
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VWR International

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TEMPERATURE parameters and ranges) indicators or recorders WEIGHING INSTRUMENTS
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Vantify

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Appendix 5 of HSG 227 (2004) (HSG 264, 2012)
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DIN EN 61466-1 DIN EN 61466-2 DIN 14678 DIN EN 54-2/A1 DIN EN 543 + 3 more
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Vectoflow

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DAkkS D-K-21643-02-00 Gilching, DE
am Standort Vectoflow Windtunnel A, Frie Strömungsgeschwindigkeit von Gasen 15 m/s bis > 38 m/s
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Vincentius-Diakonissen-Kliniken gemeinnützige AG Zentrallabor

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Vine Consultant Services

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UKAS 10213 Bishops Stortford, GB
(HSG 264:2012) 5 of HSG 227 (2004))
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Vintec Laboratories

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UKAS 1249 Garston, GB
(HSG 248) – 2021 (PCM) based on HSG 248 P052 based on HSG 248
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DAkkS D-K-18737-01-01 Jena, DE
− Permanentes Laboratorium Positionen und Abstände gleichgerichteter Kanten positionen von Strukturen (Hartschichtmasken) + 3 more
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W H Stephens

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UKAS 7855 Belfast, GB
(HSG 264, 2012)
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WENZEL Metrology

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Koordinatenmessgeräte von <7000 mm under-Edge, UK INCA3D, Software von Inspect 3D, Cholet, F + 3 more
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WIKA Alexander Wiegand SE &

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WIN Messmittel und Service

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− Parallelendmaße − Längenmessmittel − Durchmesser − Formabweichung − Gewinde + 3 more
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WIND - consult Ingenieurgesellschaft für umweltschonende Energiewandlung

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DAkkS D-PL-11098-01-01 Admannshagen-Bargeshagen, DE
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WINDTEST Grevenbroich

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DAkkS D-PL-11233-01-01 Grevenbroich, DE
IEC 61400-12-1 IEC 61400-12-2 IEC 61400-12-3 IEC 61400-12-5 IEC 61400-12-6 + 3 more
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WSP UK

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UKAS 2538 London, GB
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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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