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
1,670 Accredited labs
18 Countries

Showing 1–25 of 834 labs

1A CAL

Active
DAkkS D-K-15115-01-00 Kassel, DE
- Gleichspannung Josephson-Josephson Multimeter Quellen > 0,2 V Spannungsnormale + 3 more
View Profile

3-Rath Kalibrier+Prüftechnik

Active
DAkkS D-K-15158-01-00 Haiger, DE
Sound intensity — scanning method (ISO 9 Härteprüfmaschinen Knoop- und 70 HR15N 42 HR30N + 3 more
View Profile

3D Service

Active
DAkkS D-K-18164-01-01 Partenstein, DE
Münchingen, D CAM 2, Software von Holos, Software von Carl Metrologic, Software von Metrologic Group ≤ 9090 mm + 3 more
View Profile

8tree GmbH 8tree Calibration Lab

Active
DAkkS D-K-21981-01-00 Konstanz, DE
8tree Scanner / 0 mm bis 100 mm Laterale Größe von Tiefenmaß/ -unterstand (Härteskalen HV0,01
View Profile

A.S.T. - Angewandte System Technik GmbH, Mess- und Regeltechnik

Active
DAkkS D-K-17303-01-01 Dresden, DE
Kraft 0,5 N Zug- und Druckkraft Vibration measuring instruments — requir Sound power — in-situ using reference so 20 kN + 3 more
View Profile

ABB AG Kalibrierlaboratorium für Druck, Durchfluss und Temperatur

Active
DAkkS D-K-12115-01-00 Minden, DE
Absolutdruck p abs positiver Überdruck Positiver Überdruck p e Überdruck p + 3 more
View Profile

ABIT Ingenieure Trautmann

Active
DAkkS D-PL-14560-01-00 Teltow, DE
DIN ISO 8297 DIN 45645-1 DIN 45645-2 DIN 45680 Beiblatt 1 ISO 11338-2 + 2 more
View Profile

ABIT Ingenieure Trautmann

Active
DAkkS D-PL-14560-01-02 Potsdam, DE
BS EN ISO 16283-1:2014+A1:2017BS EN ISO ISO 10052 BS EN ISO 16283-2:2020 DIN EN ISO 16283-3 DIN 4109-4
View Profile

AIP

Active
DAkkS D-K-21076-01-01 Haldenwang, DE
Railway brake — anti-slide device (UIC 5 Railway brake — magnetic track brakes (U Railway brakes — conditions for homologa Messgeräte im Kraftfahrwesen − Abgasmessgeräte für Fremdzündungsmotor + 3 more
View Profile

AKL Messtechnik

Active
DAkkS D-K-18095-01-00 Karlsfeld, DE
/ Messgeräte 0,001 V > 0,22 V > 2,2 V > 11 V + 3 more
View Profile

AKUVIB Engineering and Testing

Active
DAkkS D-PL-11133-01-01 Bochum, DE
IEC 61000-4-2: 2008 VDE 0847-4-2 IEC 61000-4-3: 2006 VDE 0847 IEC 61000-4-4: 2012 + 3 more
View Profile

AL-PRO

Active
DAkkS D-PL-11316-01-00 Großheide, DE
IEC 61400-12-1 * IEC 61400-12-5 * IEC 61400-50 * IEC 61400-50-1 * IEC 61400-50-2 * + 1 more
View Profile

ALAB-Analyse Labor in Berlin

Active
DAkkS D-PL-18883-01-00 Berlin, DE
DIN ISO 16000-3 DIN ISO 16000-6 DIN EN ISO 16017-1 DIN ISO 12884 EN 16516 + 3 more
View Profile

ALS Germany

Active
DAkkS D-PL-14162-01-03 Altenberge, DE
DIN EN ISO 15587-1 DIN EN ISO 15587-2 DIN EN ISO 14403-2 DIN 38405-4 DIN 38405-8 + 3 more
View Profile

AMETEK CTS Europe GmbH Kalibrierlabor

Active
DAkkS D-K-15033-01-00 Berlin, DE
1,5 V/m bis 30 V/m 3 V/m bis 100 V/m 1 GHz bis 8 > 8 GHz bis 18 - Gleichspannung + 3 more
View Profile

AQRAT

Active
DAkkS D-K-15060-01-00 Dettingen unter Teck, DE
Messschieber für 0 mm Außen-, Innen- und > 500 mm > 1000 mm Tiefenmessschieber * 0 mm Sondermessschieber 0 mm + 3 more
View Profile

Ahlborn Meß- und Regelungstechnik

Active
DAkkS D-K-19342-01-02 Holzkirchen, DE
Taupunkttemperatur Railway braking — urban guided transport Temperaturtransmitter Widerstandssensor *) –30 °C + 3 more
View Profile

Airbus Defence and Space

Active
DAkkS D-K-18731-01-01 Manching, DE
- Gleichspannung / Messgeräte 1 µV Quellen > 1 V + 3 more
View Profile

Akustikberatung Wiemers

Active
DAkkS D-PL-11244-01-01 Berlin, DE
EN 14033-3 ISO 9611 ISO 11201
View Profile

Akustikbüro Dahms

Active
DAkkS D-PL-20065-01-00 Potsdam, DE
DIN 4150-1 DIN 4150-2 DIN 4150-3 DIN EN 61400-11
View Profile

Akustikbüro Göttingen - Alphei Püschel Rösler

Active
DAkkS D-PL-18995-01-00 Göttingen, DE
DIN 45645-2
View Profile

Akustikbüro K5

Active
DAkkS D-PL-20822-01-00 Berlin, DE
DIN EN IEC 60268-16 DIN VDE 0833-4
View Profile

Akustikbüro Krämer & Stegmaier

Active
DAkkS D-PL-11344-01-01 Berlin, DE
ISO 23351-1 ASTM E 1354 DIN EN ISO 717-1 DIN EN ISO 717-2 DIN EN ISO 3382-1 + 3 more
View Profile

Allgäuer Messzentrum

Active
DAkkS D-K-19562-01-01 Kaufbeuren, DE
Durchmesser 1 mm 510 mm Rundheitsabweichung 1 mm Parallelitätsabweichung Rundheitsabweichung + 3 more
View Profile

Ambulanzzentrum des UKE GmbH Fachbereich Labormedizin

Active
DAkkS D-ML-19804-01-00 Hamburg, DE
Cyclosporin A Everolimus FK 506 (Tacrolimus) Sirolimus 6-Methylmercaptopurin + 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