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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SPEKTRA Schwingungstechnik und Akustik GmbH Dresden

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DAkkS D-K-15183-01-02 Dresden, DE
Akustische Messgrößen* Schalldruckpegel (Freifeld), (bezogen au Freifeld-Leerlauf- oder 125 Hz ˃ 250 Hz mit / ohne Windschirm > 8 kHz + 3 more
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SPS electronic

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DAkkS D-K-20497-01-01 Twist, DE
- Gleichspannung Messgeräte 1 mV > 330 mV 3,3 V Messgeräte 0,33 V + 3 more
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SSW Prüfsysteme und Service GmbH Weißberg

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DAkkS D-K-17475-01-00 Hilden, DE
Vibration measuring instruments — test m Vibration measurements near traffic — me Härteprüfmaschinen Acoustics — tonality assessment (DIN 456 Noise measurement on railway vehicles — + 3 more
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ST GOBAIN GLASS France - Saint-Gobain Research Compiègne

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COFRAC 1-1374 Thourotte, FR
DIN EN ISO 10140-1 DIN EN ISO 717-1 DIN EN ISO 10140-2 DIN EN ISO 10140-4 DIN EN ISO 10140-5
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STEARO

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COFRAC 1-7174 Velaux, FR
DIN EN 12469 NF S 90-351 BS EN ISO 14644-1:2015 ISO 14644-3
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SYNLAB GHANA

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DAkkS D-ML-20424-01-00 Accra, DE
Alpha-Fetoprotein Beta Human Chorionic Gonadotrophin (BHCG), quantitative CA 125 CEA + 3 more
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SYNLAB MVZ Augsburg

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DAkkS D-ML-13225-01-01 Augsburg, DE
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SYNLAB MVZ Dachau GmbH SYNLAB Gauting Zweigniederlassung der SYNLAB MVZ Dachau

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SYNLAB MVZ Hessen GmbH Standort Kassel

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SYNLAB MVZ Leinfelden

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SYNLAB MVZ Weiden GmbH Medizinisches Versorgungszentrum Regensburg

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HbA1c Erythrozyten Leukozyten Leukozytendifferenzierung Reticulozyten + 3 more
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SYNLAB MVZ Weiden GmbH SYNLAB Medizinisches Versorgungszentrum Nürnberg

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DAkkS D-ML-13014-02-01 Nürnberg, DE
HbA1c Albumin Oestradiol 17ß Cortisol Salmonella spp. + 3 more
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SYNLAB Medizinisches Versorgungszentrum Augsburg

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DAkkS D-ML-13225-01-00 Augsburg, DE
HbA1c β-HCG Blutbild, automatisch Differentialblutbild, automatisch Hb-Äquivalent der Retikulozyten + 3 more
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SYNLAB MVZ Humangenetik München

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angeborener Chromosomensatz partieller angeborener partieller Chromosomensatz (zur Abklärung bekannter familiärer Chromosomenveränderung) + 3 more
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SYNLAB Medizinisches Versorgungszentrum Berlin

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DAkkS D-ML-13202-01-00 Berlin, DE
HbA1c Blutbild, maschinell Differentialblutbild, maschinell Zellzählung Retikulozyten, maschinell + 3 more
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SYNLAB Medizinisches Versorgungszentrum Ettlingen

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DAkkS D-ML-13095-01-00 Ettlingen, DE
RPR (Cardiolipin) Amiodaron, Desmethylamiodaron Clozapin, Norclozapin HbA1c Cyclosporin A, Everolimus, Sirolimus, Ta + 3 more
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SYNLAB Medizinisches Versorgungszentrum Hamburg

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SYNLAB Medizinisches Versorgungszentrum Heidelberg

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SYNLAB Medizinisches Versorgungszentrum Humangenetik Freiburg

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DAkkS D-ML-21093-01-01 Freiburg, DE
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SYNLAB Medizinisches Versorgungszentrum Humangenetik Mannheim

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SYNLAB Medizinisches Versorgungszentrum Jade-Weser

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DAkkS D-ML-18938-01-01 Varel, DE
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SYNLAB Medizinisches Versorgungszentrum Trier

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DAkkS D-ML-13122-01-00 Trier, DE
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SYNLAB Medizinisches Versorgungszentrum Trier GmbH Zweigniederlassung SYNLAB Medizinisches Versorgungszentrum Neuwied

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DAkkS D-ML-13122-02-00 Neuwied, DE
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SYNLAB Medizinisches Versorgungszentrum Weiden

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DAkkS D-ML-13014-01-00 Weiden, DE
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SYNLAB Medizinisches Versorgungszentrum Weiden GmbH Medizinisches Versorgungszentrum Nürnberg

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DAkkS D-ML-13014-02-00 Nürnberg, DE
HbA1c Mittlere Blutglucose Aktivitätskonzentration Blutsenkung % Hyperchrome Erythrozyten + 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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