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 51–75 of 906 labs

Bioscientia Institut für Medizinische Diagnostik GmbH Bioscientia MVZ Freiburg

Active
DAkkS D-ML-13452-10-00 Freiburg, DE
Okkultes Blut Großes Blutbild Kleines Blutbild Retikulozyten Thrombozyten + 3 more
View Profile

Bioscientia Institut für Medizinische Diagnostik GmbH Bioscientia MVZ Ingelheim

Active
DAkkS D-ML-13452-01-01 Ingelheim, DE
2C-B 2C-I 3-Hydroxy-Bromazepam 5-Hydroxyindolessigsäure 6-Acetylcodein + 3 more
View Profile

Bioscientia Institut für Medizinische Diagnostik GmbH Bioscientia MVZ Jena

Active
DAkkS D-ML-13452-05-00 Jena, DE
Zelldifferenzierung Erythrozyten Großes Blutbild Hämoglobin Kleines Blutbild + 3 more
View Profile

Bioscientia Institut für Medizinische Diagnostik GmbH Bioscientia MVZ Mainz

Active
DAkkS D-ML-13452-07-00 Mainz, DE
Hämoglobin (immunologisch) CA 125 CA 15-3 CA 19-9 CA 72-4 + 3 more
View Profile

Bioscientia Institut für Medizinische Diagnostik GmbH Bioscientia MVZ Nordrhein

Active
DAkkS D-ML-13452-06-00 Moers, DE
Hämoglobin Natriumchlorid Kalium Natrium Eiweißelektrophorese: Albumin, Alpha-1-G + 3 more
View Profile

Bioscientia MVZ Labor Karlsruhe

Active
DAkkS D-ML-13322-01-00 Karlsruhe, DE
10-OH-Carbazepin 11-Deoxycortisol 17-OH-Progesteron 21-Deoxycortisol 25-OH Vitamin D2 + 3 more
View Profile

Bioscientia MVZ Labor Mittelhessen

Active
DAkkS D-ML-19774-01-01 Gießen, DE
Thrombozytenfunktion 5-Hydroxyindolessigsäure Adrenalin Amiodaron, Desmethylamiodaron Carbohydrate-deficient + 3 more
View Profile

Bioscientia MVZ Labor Saar

Active
DAkkS D-ML-13031-01-01 St. Ingbert, DE
Lamotrigin Metanephrine, Normetanephrine Erythrozyten Aripiprazol Lymphozyten + 3 more
View Profile

Bizerba SE &

Active
DAkkS D-PL-15018-01-00 Balingen, DE
IEC 61000-4-2: 2008 IEC 61000-4-3: 2006 IEC 61000-4-4: 2012 IEC 61000-4-5: 2005 IEC 61000-4-6: 2013 + 3 more
View Profile

Black Forest Testlab

Active
DAkkS D-PL-22936-01-01 Löffingen, DE
DIN EN 61000-3 IEC 61000-3-2: 2014 IEC 61000-3-3 IEC 61000-3-11: 2017 IEC 61000-3-12: 2011 + 3 more
View Profile

Blower Door

Active
DAkkS D-K-19788-01-00 Springe-Eldagsen, DE
Positiver und negativer verwendete Abkürzungen: DKD-R
View Profile

Bremer Umweltinstitut Gesellschaft für Schadstoffanalytik und Begutachtung

Active
DAkkS D-PL-18812-01-02 Bremen, DE
DIN EN ISO 2418 DIN EN 61340-4-4 DIN CEN ISO/TS 16179 DIN EN ISO 14362-1 DIN EN ISO 14362-3 + 3 more
View Profile

Bundesamt für Seeschifffahrt und Hydrographie

Active
DAkkS D-PL-12084-01-00 Hamburg, DE
IEC 60945 IEC 61162-1 IEC 61162-2 IEC 61162-450 IEC 61162-460 + 3 more
View Profile

Bundesamt für Strahlenschutz Radon-Kalibrierlaboratorium

Active
DAkkS D-K-15063-01-00 Berlin, DE
Radioaktivität 50 Bq/m³ Radon-222- 100 Bq/m³ tration in Luft 200 Bq/m³ + 3 more
View Profile

Bundesanstalt für Materialforschung und -prüfung (BAM) Abteilung 7 / Bauwerkssicherheit

Active
DAkkS D-PL-11075-01-01 Berlin, DE
DIN EN ISO 2808 DIN EN ISO 3219-2 DIN EN ISO 3838 DIN EN 933-1 DIN EN 933-4 + 3 more
View Profile

Bundesanstalt für Materialforschung und -prüfung (BAM) Fachbereich 8.1; Sensorik, mess- und prüftechnische Verfahren

Active
DAkkS D-K-11075-08-00 Berlin, DE
Conformity assessment — requirements for Railway composite brake blocks — require 0,2 kN 0,4 kN 100 kN + 3 more
View Profile

Bundesministerium der Verteidigung Bundeswehrkrankenhaus Berlin Abteilung XVI Laboratoriumsmedizin

Active
DAkkS D-ML-13381-01-01 Berlin, DE
NRBC-Normoblasten Anteil unreifer Retikulozyten Erythrozyten DELTA-He Leukozyten + 3 more
View Profile

Bundeswehrkrankenhaus Berlin Abteilung XVI Laboratoriumsmedizin

Active
DAkkS D-ML-13381-01-00 Berlin, DE
Blutungszeit PFA ADP Blutungszeit PFA EPI PFA-P2Y Erythrozyten Hämatokrit + 3 more
View Profile

Bundeswehrkrankenhaus Berlin Abteilung XXI - Klinische Mikrobiologie & Krankenhaushygiene

Active
DAkkS D-ML-13381-02-00 Berlin, DE
Leukozyten Enteroaggregative E. coli Legionellen Staphylokokkus aureus Salmonellen + 3 more
View Profile

Bureau Veritas Consumer Products Services Germany

Active
DAkkS D-PL-12024-03-02 Türkheim, DE
IEC 61000-4-2: 2008 VDE 0847-4-2 IEC 61000-4-3: 2006 VDE 0847-4-3 IEC 61000-4-4: 2012 + 3 more
View Profile

C-TEC Systemtechnik und Serviceleistung für die Werkstoffprüfung

Active
DAkkS D-K-20476-01-01 Dortmund, DE
/ Messgeräte Radiometrie 100 µW/cm² stärkemessgeräte UV-A 365nm Linearität der + 3 more
View Profile

C. Grünewälder Waagentechnik CalGroup

Active
DAkkS D-K-20113-01-00 Wuppertal, DE
Charpy impact test (ISO 148-1) Salt spray / neutral salt fog test (ISO Radiated emissions (CISPR 32) verwendete Abkürzungen:
View Profile

CAL

Active
DAkkS D-PL-14532-01-02 Darmstadt, DE
DIN 38402-A 11 DIN 38402-A 12 DIN 38402-A 13 DIN ISO 5667-5 (A 14) DIN EN ISO 5667-6 (A 15) + 3 more
View Profile

CARTESY

Active
DAkkS D-K-22378-01-01 Mühldorf a. Inn, DE
Tensile testing of metallic materials (I Vickers hardness test (ISO 6507) Kraft Railway vehicles — specific test require Railway — traction effort and braking fo + 3 more
View Profile

CERTIFER Deutschland GmbH CERTIFER Prüfstelle für Schienenfahrzeuge

Active
DAkkS D-PL-11312-01-00 Nürnberg, DE
DIN EN 16334 EN 50128 EN 50129 DIN EN 50215 EN 50657 + 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