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 501–525 of 834 labs

Privatärztliche Gemeinschaft für Diagnostik Köln-Bonn

Active
DAkkS D-ML-19686-01-00 Köln, DE
HbA1c Automatisches Blutbild Leukozyten Normoblasten Retikulozyten + 3 more
View Profile

Privatärztliche Laborgemeinschaft Köln

Active
DAkkS D-ML-22827-01-01 Köln, DE
Calcium Bilirubin gesamt Creatinkinase-Muscle-Brain TPZ nach Quick Immunglobulin A + 3 more
View Profile

ProfEC Ventus

Active
DAkkS D-PL-19142-01-00 Oldenburg, DE
IEC 61400-12 Ed.1 * IEC 61400-12-1 Ed.3 * IEC 61400-12-3 Ed.1 * IEC 61400-12-4 Ed.1 * IEC 61400-12-5 Ed.1 * + 3 more
View Profile

Prüftechnik Buchmann

Active
DAkkS D-K-15130-01-00 Michelfeld, DE
Vickers hardness test (ISO 6507) Härte (WPM) * 80 HBW Härteprüfmaschinen nach Brinell-, Vickers-, Knoop > 250 HBW + 3 more
View Profile

QS-Grimm

Active
DAkkS D-K-15159-01-01 Gutach Schwarzwaldbahn, DE
Parallelendmaße * 0,5 mm DIN EN ISO 3650:1999 Zylindrische Normale 1 mm Innenzylinder * > 100 mm + 3 more
View Profile

Qopas

Active
DAkkS D-K-12048-01-00 Driedorf, DE
Koordinatenmessgeräte geräte mit einem Chorus, Help-PJM von DEA Hexagon Metrology S.p.A., Turin, I Associates EMS Products, ≤ 1500 mm + 3 more
View Profile

Questmed

Active
DAkkS D-PL-18753-02-00 Kleinmachnow, DE
ISO 22679 ISO 7207-1 ISO 14243-1 ISO 14243-2 ISO 14243-3 + 3 more
View Profile

REHAU Industries SE &

Active
DAkkS D-PL-22158-01-01 Rehau, DE
DIN EN ISO 2808 DIN EN ISO 11885 DIN EN 12697-28 DIN EN ISO 1172 DIN EN ISO 2578 + 3 more
View Profile

RIO

Active
DAkkS D-K-17376-01-00 Siegen, DE
Parallelendmaße * 0,5 mm DIN EN ISO 3650:1999 > 100 mm > 500 mm > 550 mm + 3 more
View Profile

RMA Mess- und Regeltechnik

Active
DAkkS D-K-20908-01-00 Rheinau, DE
Durchfluss von Gasen Volumendurchfluss 50 m³/h Railway brakes — brake performance (UIC (Hochdruck Erdgas 5 bis 51 bar) + 1 more
View Profile

ROTA YOKOGAWA

Active
DAkkS D-K-17720-01-00 Wehr, DE
Masse m strömender − Durchfluss von Flüssigkeiten Durchfluss von 1) In den CMC sind die erweiterten Messu Massedurchfluss dm / dt + 3 more
View Profile

Ramm Ingenieur

Active
DAkkS D-PL-20808-01-00 Wuppertal, DE
DIN 45635-1 DIN 45645 Teil 1
View Profile

Regierungspräsidium Kassel Hessische Geräteuntersuchungsstelle

Active
DAkkS D-PL-19353-02-02 Kassel, DE
IEC 60335-1: 2010 VDE 0700-1 DIN EN 60335-2-2 DIN EN 60335-2-3: 2002 DIN EN 60335-2-4 + 3 more
View Profile

Robert Koch-Institut

Active
DAkkS D-ML-13113-01-01 Berlin, DE
Salmonellen Salmonella enterica, Shigellen, Yersinie Shigellen Salmonella sv. Paratyphi Neisseria meningitidis, Listeria + 3 more
View Profile

Rolf Langenscheid GmbH Waagensystemtechnik

Active
DAkkS D-K-21801-01-00 Lüdenscheid, DE
Charpy impact test (ISO 148-1) Salt spray / neutral salt fog test (ISO elektronische Waagen 1) In den CMC sind die erweiterten Messu
View Profile

Ruhr Lab

Active
DAkkS D-PL-21007-01-00 Gelsenkirchen, DE
ISO 13909-2 ISO 13909-3 ISO 13909-5 ISO 13909-7 ISO 13909-8 + 3 more
View Profile

Ruhr Oel GmbH BP Gelsenkirchen

Active
DAkkS D-PL-19612-01-00 Gelsenkirchen, DE
DIN EN ISO 12185 DIN EN ISO 3405 DIN EN 13016-1 DIN EN ISO 20884 DIN EN ISO 20846 + 3 more
View Profile

Ruhr-Universität Bochum Humangenetik RUB

Active
DAkkS D-ML-13425-01-00 Bochum, DE
Spinocerebelläre Ataxien Bindegewebserkrankungen: ACTA2, COL1A1, HD; Chorea Huntington (Huntingtin-Gen) Dentatorubrale-Pallidoluysiane + 3 more
View Profile

S.K.I. Schlegel & Kremer Industrieautomation GmbH Kalibrierlabor

Active
DAkkS D-K-21982-01-00 Mönchengladbach, DE
Durchfluss von 2 m3/h bis 800 rn3/h − Durchfluss von Flüssigkeiten Volumendurchfluss dV/dt von strörnenden + 3 more
View Profile

SBKS

Active
DAkkS D-PL-11303-01-01 St. Wendel, DE
DIN 53394-2 DIN 53176 DIN EN ISO 1172 ASTM D 5576 IEC 60512-11-4 + 3 more
View Profile

SCHMIDT Technology

Active
DAkkS D-K-21939-01-00 St. Georgen im Schwarzwald, DE
Strömungsgeschwin- 0,1 m/s − Strömungsgeschwindigkeit von Gasen Kraft (WPM) Vibration measuring instruments — requir > 1 kN
View Profile

SCHÜCO International KG Technology Center

Active
DAkkS D-PL-11030-01-01 Bielefeld, DE
DIN EN ISO 717-1 DIN EN ISO 10052 DIN EN ISO 10140-1 DIN EN ISO 10140-2 DIN EN ISO 10140-4 + 3 more
View Profile

SGS Analytics Germany

Active
DAkkS D-PL-14004-01-01 Fellbach, DE
DIN EN ISO 5667-1 (A 4) DIN 38402-A 11 DIN 38402-A 12 DIN 38402-A 13 DIN ISO 5667-5 (A 14) + 3 more
View Profile

SGS Germany

Active
DAkkS D-PL-11020-03-01 Puchheim, 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

SGS Germany GmbH Oil, Gas and Chemicals, Fuel Technology Centre

Active
DAkkS D-PL-11020-01-00 Speyer, DE
DIN 51757 ASTM D 4052 DIN EN ISO 12185 DIN EN ISO 3405 DIN EN 13016-1 + 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