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

Showing 1,001–1,025 of 1,868 labs

Laboratoire Départemental d'Analyses de la Mayenne (LDA 53)

Active
COFRAC 1-0674 Laval Cedex, FR
DIN EN ISO 21528-2 DIN EN ISO 6888-2 DIN ISO 16649-2 DIN ISO 11665-4 NF T90-007 + 3 more
View Profile

Laboratoire Départemental d'Analyses des Ardennes (LDA 08)

Active
COFRAC 1-0885 Hagnicourt, FR
NF T 90-412 DIN EN ISO 7899-1 NF U47-101 DIN EN ISO 10523 NF T90-015-2 + 3 more
View Profile

Laboratoire Départemental d'Analyses et d'Ingénierie du Var- Site de Draguignan

Active
COFRAC 1-1519 Draguignan, FR
NF T 90-412 DIN EN ISO 7899-1 NF U47-101 DIN EN ISO 21528-2 DIN EN ISO 6888-2 + 3 more
View Profile

Laboratoire Marocain de Métrologie Industrielle - L2MI

Active
COFRAC 1-6426 12 Et 14 Lot. Mauritania Q.I Sidi Bernoussi | - Casablanca | Maroc, MA
DIN EN 12469 NF S 90-351 BS EN ISO 14644-1:2015 ISO 14644-3
View Profile

Laboratoire Métallurgique de l'Est (LME)

Active
COFRAC 1-5018 Pompey, FR
ASTM E8/E 8M DIN EN 10002-1 DIN EN ISO 6892-2 ASTM A 370 (BS EN ISO 6892-1: 2019) + 3 more
View Profile

Laboratoire Nord Services (LNS)

Active
COFRAC 1-5570 Lille, FR
NF X 43-269 NF X 43-269 - Annexe K NF X 43-050 (parties utiles NF X 43-050 ISO 16000-7
View Profile

Laboratoire d'Analyses Pumonte (LA2A)

Active
COFRAC 1-6512 Ajaccio Cedex 9, FR
DIN EN ISO 14403-2 DIN EN ISO 13395 DIN EN ISO 10304-1 DIN EN ISO 15061 ISO 5815-1 + 3 more
View Profile

Laboratoire d'Analyses de Surveillance et d'Expertise de la Marine (LASEM)

Active
COFRAC 1-1083 Toulon Armees, FR
NF X 43-050 DIN EN ISO 10703 DIN EN ISO 17294-2 DIN EN ISO 14403-2 DIN EN ISO 10704 + 3 more
View Profile

Laboratoire d'Analyses de Surveillance et d'Expertise de la Marine (LASEM) - Base Navale de Brest

Active
COFRAC 1-1931 Brest, FR
DIN EN ISO 17294-2 NF T 90-412 VDE 414-9-11 DIN EN ISO 10304-1 DIN EN ISO 9698 + 3 more
View Profile

Laboratoire d'Analyses des Eaux de Pays de Montbéliard Agglomération

Active
COFRAC 1-6554 Voujeaucourt, FR
DIN EN ISO 17294-2 NF T 90-412 DIN EN ISO 7899-1 DIN EN ISO 10304-1 ISO 5815-1 + 3 more
View Profile

Laboratoire d'Hydrologie - Environnement

Active
COFRAC 1-6567 Bordeaux Cedex, FR
DIN EN 27888 NF T 90-412 DIN EN ISO 7393-2 DIN EN 26461-2 DIN EN ISO 10523 + 3 more
View Profile

Laboratoire d'Olfactométrie - EGIS

Active
COFRAC 1-2314 Aix-En-Provence, FR
DIN EN 13725:2003-07 und Berichtigung
View Profile

Laboratoire de Contrôle des Eaux

Active
COFRAC 1-6404 Clermont Ferrand, FR
DIN EN ISO 17294-2 DIN EN ISO 7899-1 VDE 414-9-11 DIN EN ISO 10304-1 DIN EN ISO 10523 + 3 more
View Profile

Laboratoire de Microbiologie RD&E

Active
COFRAC 1-6419 Sainghin-En-Melantois, FR
DIN EN 17126 DIN EN 14562 DIN EN 14348 IEC 60127-5 DIN EN 14563 + 3 more
View Profile

Laboratoire de Recherche des Polluants de l'Environnement

Active
COFRAC 1-6395 Cherbourg-En-Cotentin, FR
NF ISO 22262-1 (parties utiles de la NF X43-050 (parties utiles de NF ISO 22262-1 (parties utiles NF X43-050 (parties utiles de la
View Profile

Laboratoire de l'Environnement et de l'Alimentation de la Vendée (LEAV)

Active
COFRAC 1-1064 La Roche-Sur-Yon Cedex 9, FR
DIN ISO 11665-4 DIN 53483-2 DIN EN ISO 7937 NF V08-050 NF V 08-060 + 3 more
View Profile

Laboratoires AREIA Environnement - Site de Bourgtheroulde-Infreville

Active
COFRAC 1-5094 Grand Bourgtheroule, FR
NF X 43-050 NF X 43-269 - Annexe K NF ISO 22262-1 (parties utiles de NF X43-050 (parties utiles de la DIN EN 14346 + 1 more
View Profile

Laboratoires AREIA Environnement - Site de Chavanod

Active
COFRAC 1-6063 Chavanod, FR
NF ISO 22262-1 (parties utiles de la DIN EN 14346 NF ISO 22262-1 (parties utiles de NF X43-050 (parties utiles de la
View Profile

Laboratori chimici Stante srl

Active
ACCREDIA 00790 Bologna, IT
ISO 12846 ISO 11348-3 DIN EN 12457-2 ISO 9377-2 ISO 19250 + 3 more
View Profile

Laboratorio Analisi BIO 5 Servizi

Active
ACCREDIA 00727 Castel Maggiore, IT
UNI 13649 EPA 6010 DIN EN 12880 DIN EN 13284-1 UNI 9432 + 3 more
View Profile

Laborgemeinschaft Berlin - Labor 28

Active
DAkkS D-ML-17159-01-00 Berlin, DE
Basophile Granulozyten Eosinophile Granulozyten Erythrozyten Hämatokrit Leukozyten + 3 more
View Profile

Laborgemeinschaft Köln

Active
DAkkS D-ML-18033-01-00 Köln, DE
Liste aller Untersuchungsverfahren im fl Webpräsenz des Medizinischen Laboratoriu HbA1c Basophile Basophile absolut + 3 more
View Profile

Laborgemeinschaft Odenwald

Active
DAkkS D-ML-18493-01-00 Darmstadt, DE
HbA1c Großes Blutbild Kleines Blutbild Retikulocyten Natriumchlorid + 3 more
View Profile

Laborärzte Sindelfingen

Active
DAkkS D-ML-13247-01-01 Sindelfingen, DE
Ristocetin Kofactor Aktivität Willibrand Faktors a-Hydroxy-Alprazolam Amilsulprid 7-amino-Flunitrazepam + 3 more
View Profile

Labosport

Active
UKAS 4098 Hucknall, GB
DIN EN 12228 DIN EN 14808 ASTM D 1177 DIN EN 12234 ISO 2549 + 3 more
View Profile

No matching labs found.

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

Other Test Methods

0 labs selected
Compare