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
20 Countries

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DAkkS D-K-19647-01-00 Köln, DE
Magnetische Feldstärke Referenzmagnetsystem Magnetische Flussdichte dichtemessgerät Magnetisches Moment + 3 more
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DAkkS D-K-15074-01-01 Göttingen, DE
eingängige zylindrische Einstellringe * 10 mm Railway braking — adhesion under braking Rundheitsabweichung Prüfstifte * 0,14 mm + 3 more
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UKAS 28563 Driffield, GB
ISO 6579-1 ISO 21528-2 ISO 16649-2 TP/007 based on BS ISO ISO 11290-2 + 3 more
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DAkkS D-PL-11143-01-01 Weimar, DE
DIN EN 62196-1: 2015 DIN EN 196-3 DIN EN 196-6 DIN EN 196-7 DIN EN 196-8 + 3 more
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DAkkS D-K-11143-01-01 Weimar, DE
Kraft (WPM) * Kalibrierung der Prüfkraftmesseinrichtung Machinery vibration — industrial machine 0,01 N + 3 more
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DAkkS D-K-11267-01-00 Braunschweig, DE
Länge (WPM) Vibration measuring instruments — test m 0,1 mm Vibration measurements near traffic — me Härteprüfmaschinen nach + 3 more
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DAkkS D-PL-11267-01-00 Braunschweig, DE
DIN EN 932-1 DIN EN 932-2 DIN EN 933-1 DIN EN 933-2 DIN EN 933-4 + 3 more
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DAkkS D-PL-11220-01-01 Hannover, DE
DIN EN 17468-1 DIN 18516-1 DIN EN 12350-1 DIN EN 12350-2 DIN EN 12350-4 + 3 more
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DAkkS D-PL-11142-01-01 Dortmund, DE
DIN EN ISO 15630-1 DIN EN ISO 15630-2 DIN EN ISO 15630-3 DIN EN 274-1 VDE 0847-4-2 + 3 more
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DAkkS D-ML-22182-01-00 Leipzig, DE
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DAkkS D-ML-22296-01-01 Augsburg, DE
25-OH-Vitamin D Stimulation mit Antigenen (Aspergillus 1 / 2, Babesia Bartonella henselae, Candida albicans, Chlamydia pneumoniae, Chlamydi + 3 more
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DAkkS D-ML-13168-08-01 Hannover, DE
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DAkkS D-ML-13168-09-00 Hannover, DE
ABO-System lsoagglutinine (Serumeigenschaften) Rh-Merkmal D Kell-Merkmal K + 3 more
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DAkkS D-ML-13168-02-00 Hannover, DE
Toxoplasma gondii -Ak Treponema pallidum-AK Herpes-Simplex-Viren, Typen 2, Aciclovir-Resistenz Adenoviren + 3 more
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DAkkS D-ML-22843-01-01 Cottbus, DE
D-Dimer Gerinnungsfaktor XIII Protein S Fibrinmonomere Oligosaccharide + 3 more
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DAkkS D-ML-22843-02-00 Cottbus, DE
Aspergillus-Antikörper Brucella-Antikörper Candida dubliniensis Candida-Antikörper Cryptococcus Antigen + 3 more
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DAkkS D-ML-22289-01-00 Heppenheim (Bergstraße), DE
ALOT AML-ED/MRD BPDCN B-ALL-ED/MRD T-ALL-ED/MRD + 3 more
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DAkkS D-ML-13288-01-00 Bautzen, DE
Basophile Blutbildmessung (Automat) Eosinophile Erythrozyten Basophile Granulozyten + 3 more
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DAkkS D-ML-13288-02-01 Dresden, DE
Basophile Blutbildmessung (Automat) Eosinophile Erythrozyten Basophile Granulozyten + 3 more
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DAkkS D-ML-13291-01-00 Magdeburg, DE
Metanephrin, Normetanephrin VMS, 5-HIES, HVS 10-OH-Carbazepin 3-Methoxytyramin 9-OH-Risperidone + 3 more
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DAkkS D-ML-13414-01-00 Rostock, DE
PFA-Verschlusszeit 3-Methoxytyramin 5-Hydroxyindolessigsäure Adrenalin Dopamin + 3 more
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DAkkS D-ML-20110-01-01 Zwickau, DE
10-Hydroxycarbazepin (Eslicarbazepin) Amiodaron, Desmethylamiodaron CDT Amiodaron, Desethylamiodaron + 3 more
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DAkkS D-ML-13374-01-00 Kaiserslautern, DE
SNV-Genotypisierung (Nachweis Antithrombin-III-Mangel (in-house) (SERPINC1-Gen [OMIM *107300]) HIV-Wirtsresistenz + 3 more
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DAkkS D-ML-13078-01-00 Bielefeld, DE
Thrombozytenaggregation (induzierte) Carbazepin) 3-Methoxytyra min, freies 5-Hydroxy-lndolessigsäure + 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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