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-21902-01-00 Wilsdruff ST Kesselsdorf, DE
Charpy impact test (ISO 148-1) Salt spray / neutral salt fog test (ISO Radiated emissions (CISPR 32) 1) In den CMC sind die erweiterten Messu
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DAkkS D-PL-19254-01-00 Höchberg, DE
DIN 4150-1 DIN 4150-2 DIN 4150-3 DIN 45641 DIN 45645-1 + 3 more
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DAkkS D-PL-11122-01-00 Kloster Lehnin, DE
DIN EN ISO 10140-1 DIN EN ISO 10140-2 DIN EN ISO 10140-4 DIN EN ISO 10140-5 DIN EN ISO 16283-1 + 3 more
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UKAS 2437 Udaipur 313 003, IN
DIN EN 55022: 2011 CISPR 22 (1997/2006/2008) IEC/CISPR 16-2-1 CISPR 32 (2015) + A1 (2019) AS/NZS CISPR 11:2004 + 3 more
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Yncoris

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DAkkS D-PL-14424-02-00 Hürth, DE
DIN 45645-2
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Z LAB Srl

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ACCREDIA 01046 Cerea, IT
DIN EN ISO 11546-1 UNI EN ISO 9295 DIN EN ISO 11957 ISO 354 ISO 3741 + 3 more
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DAkkS D-ML-18420-01-00 Lübeck, DE
HbA1c Basophile Eosinophile Thrombozyten Lymphozyten + 3 more
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DAkkS D-K-15103-01-01 Königswinter, DE
0,05 V - Gleichstromstärke dreiphasig 60 V; 120 V; 240 V > 240 V einphasig 0,002 V + 3 more
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DAkkS D-K-22359-01-00 Oberursel, DE
Wechselstromstärke 5 mA 5 mA, 10 mA, 20 mA 40 mA, 80 mA, 150 mA 240 mA, 300 mA, 480 mA 600 mA, 720 mA, 960 mA + 3 more
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DAkkS D-K-23094-01-01 Eisingen, DE
Außengewinde Nenndurchmesser zylindrische Innengewinde − Längenmessgeräte Längenmessmittel Länge + 3 more
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DAkkS D-PL-22057-01-01 Ludwigsburg, DE
DIN EN ISO 4210-1 DIN EN ISO 11243 ISO 5775-1 DIN EN 16054 DIN EN 1371-1 + 3 more
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DAkkS D-ML-13013-01-00 Chemnitz, DE
Thrombozytenfunktion Ristocetin) Thrombozytenaggregation Arachidonsäure, Epinephrin, Kollagen, Ri 17-alpha-Hydroxy-Progesteron + 3 more
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DAkkS D-ML-13117-01-00 Regensburg, DE
angeborener Chromosomensatz 22q11.2-Mikrodeletionssyndrom (22q11.2) Kopienzahlveränderungen (Regionen laut MLPA-Kit) + 3 more
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DAkkS D-K-15186-01-01 Bitterfeld-Wolfen, DE
- Gleichspannung Railway vehicles — specific test require Quellen - Gleichstromstärke / Messgeräte + 3 more
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DAkkS D-K-15186-01-02 Bitterfeld-Wolfen, DE
Masse oder Konventioneller Wägewert/ Massenormale* Massenormale* > 100 g + 3 more
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DAkkS D-ML-13153-01-00 Jena, DE
Angelmann-Syndrom (15q11-q13 Region) Prader-Willi-Syndrom (15q11-q13 Ausschluss/ Nachweis mütterlicher Zellen im pränatalen + 3 more
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DAkkS D-K-18080-01-00 Friedrichshafen, DE
Parallelendmaße 0,5 mm DIN EN ISO 3650:1999 Parallelendmaße * 0,5 mm Parallelendmaße Parallelendmaße > 100 mm + 3 more
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DAkkS D-K-19937-01-02 Losheim am See, DE
Railway brake — anti-slide device (UIC 5 Messgeräte im Kraftfahrwesen − Rollenbremsprüfstände − Plattenbremsprüfstände − Scheinwerfer-Einstell-Prüfsystem + 3 more
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ZwickRoell

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DAkkS D-K-18351-01-00 Ulm, DE
Absolutdruck p * Kraftmesseinrichtungen von Werkstoffprüfmaschinen Acoustics — tonality assessment (DIN 456 Auflagekraft von Fallmassen + 3 more
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DAkkS D-ML-13280-01-00 Hamburg, DE
Thombozyten-Funktionstest 10-OH-Carbazepin 11-Deoxycorticosteron 11-Deoxycortisol 21-Deoxycortisol + 3 more
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DAkkS D-ML-13432-01-00 Würzburg, DE
Automatisches Blutbild Erythrozytenzahl Hämatokrit Hämoglobin Hb im einzelnen Erythrozyten + 3 more
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DAkkS D-ML-13131-02-01 Hannover, DE
HbA1c Basophile Eosinophile Basophile Granulozyten Lymphozyten + 3 more
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DAkkS D-ML-13131-01-01 Göttingen, DE
Homovanillinsäure Vanillin-Mandelsäure 5-Hydroxyindolessigsäure VLCFA Phytansäure + 3 more
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DAkkS D-ML-20928-01-01 Jena, DE
Albumin Alkalische Phosphatase Alpha-Amylase AT3 Bilirubin, direkt + 3 more
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DAkkS D-ML-13318-01-00 Halle (Saale), DE
HbA1c CDT Vitamin B1 Vitamin B6 Vitamin A + 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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