ISO 3740

Sound power level determination — general measurement guidelines

ISO 3740 provides overarching principles and guidelines for selecting appropriate methods to determine sound power levels of noise sources across diverse industrial and consumer applications. It establishes the framework for choosing between precision, engineering, and survey methods based on application requirements and environmental conditions. Sound power determination is essential for manufacturers complying with noise emission directives, environmental impact assessments, and product labeling regulations across the EU. ISO 17025 accreditation ensures laboratories apply correct methodologies, maintain calibrated instrumentation, and report results with documented uncertainty traceable to primary standards.

What it measures

  • Sound power level (Lw) in decibels
  • Frequency-weighted sound power (A-weighted)
  • Octave or one-third-octave band sound power
  • Sound energy levels
  • Noise source classification and categorization
🇩🇪 DIN EN ISO 3743-1 🇬🇧 BS EN ISO 3743-1 🇫🇷 NF EN ISO 3743-1 🇮🇹 UNI EN ISO 3743-1 🇪🇸 UNE EN ISO 3743-1 🇳🇱 NEN EN ISO 3743-1 🇩🇪 DIN EN ISO 3744 🇬🇧 BS EN ISO 3744 🇫🇷 NF EN ISO 3744 🇮🇹 UNI EN ISO 3744 🇪🇸 UNE EN ISO 3744 🇳🇱 NEN EN ISO 3744
1,868 Accredited labs
20 Countries

Showing 551–575 of 1,868 labs

Eurofins Electrical & Electronic UK

Active
UKAS 0452 Bideford, GB
AC CURRENT AC VOLTAGE (continued) Measurement (continued) DC CURRENT Generation (continued) + 3 more
View Profile

Eurofins Electrical & Electronic UK

Active
UKAS 1574 York, GB
IEC 61000-6-1 IEC 61000-4-29: 2000 DIN EN 62233 IEC 61000-4-11: 2004 DIN EN 61000-4-12 + 3 more
View Profile

Eurofins Food Testing UK

Active
UKAS 2262 Ipswich, GB
ISO 6579-1 ISO 6888-1 ISO 16649-2 ISO 11290-1 1) AM/M/11-2 based on BS EN + 3 more
View Profile

Eurofins Food Testing UK

Active
UKAS 9659 Grimsby, GB
Method 15.2 based on BS EN ISO ISO 15213-2 Method 9.8 based on BS EN BS EN Method 5.11 based on BS EN ISO Method 4.3 based on BS EN ISO + 3 more
View Profile

Eurofins Food Testing UK

Active
UKAS 2622 Linlithgow Bridge, GB
ISO 6579-1 ISO 4832 EUMM 3.03 based on BS EN EUMM 3.07 based on BS EN ISO BS ISO 21528-2:2017 + 3 more
View Profile

Eurofins Food Testing UK

Active
UKAS 0342 Wolverhampton, GB
ISO 712 ISO 4833-1 on BS EN ISO 1736:2008 ISO 21528-2 BS ISO 4832:2006 + 3 more
View Profile

Eurofins Laborbetriebsgesellschaft Gelsenkirchen

Active
DAkkS D-ML-17481-01-01 Gelsenkirchen, DE
Thrombozytenfunktion Agomelatin Amisulprid (Psychopharmaka) Amitriptylin (TZA) Aripiprazol (Neuroleptika) + 3 more
View Profile

Eurofins MVZ Medizinisches Labor Gelsenkirchen

Active
DAkkS D-ML-17480-01-01 Gelsenkirchen, DE
Thrombozytenfunktion Agomelatin Amisulprid (Psychopharmaka) Amitriptylin (TZA) Aripiprazol (Neuroleptika) + 3 more
View Profile

Europäisches Testzentrum für Wohnungslüftungsgeräte (TZWL) e. V.

Active
DAkkS D-PL-19438-01-00 Schwerte, DE
DIN EN 13141-4 DIN EN 13141-6 DIN EN 13141-7 DIN EN 13141-8 DIN EN 13141-11 + 3 more
View Profile

Evangelisches Klinikum Niederrhein Laboratoriumsmedizin

Active
DAkkS D-ML-20007-01-00 Duisburg, DE
Glykohämoglobin A1C (HbA1c) Basophile Granulozyten Eosinophile Granulozyten Erythrozytenverteilungsbreite (RDW) + 3 more
View Profile

Evangelisches Krankenhaus Oberhausen GmbH Institut für Laboratoriumsmedizin und Klinische Mikrobiologie

Active
DAkkS D-ML-18340-01-00 Oberhausen, DE
Blutzellen Basophile Granulozyten Basophile Granulozyten, Eosinophile Gran Eosinophile Granulozyten, Erythrozyten, Basophile Leukozyten, absolut + 3 more
View Profile

Evolution Environmental

Active
UKAS 9661 Teston, GB
(HSG 264, 2012)
View Profile

F.S. Fehrer Automotive

Active
DAkkS D-PL-21199-01-01 Kitzingen, DE
DIN EN ISO 1798 DIN EN ISO 1856 Myopathie, Nemaline (TyP1, 3-10: DIN EN ISO 14125 DIN EN ISO 179-1 + 3 more
View Profile

FCBA - Bordeaux

Active
COFRAC 1-0201 Bordeaux, FR
DIN EN 947 ISO 24339 DIN CEN TS 15119-2 DIN EN ISO 3741 NF P 20-501 + 3 more
View Profile

FCBA - Champs sur Marne

Active
COFRAC 1-6839 Champs-Sur-Marne, FR
NF EN 716-1/-2 NF EN 12221-1/-2 NF EN 14988-1/-2 DIN 51130 DIN EN 12227 + 3 more
View Profile

FES GmbH Fahrzeug-Entwicklung Sachsen

Active
DAkkS D-PL-17354-01-00 Zwickau, DE
ISO 16750-3 DIN EN 60068-2-53 DIN EN 60068-2-64 ISO 20653 ISO 16750-4 + 3 more
View Profile

FGQ-Control GmbH Kalibrierdienst für mechanische, elektrische und physikalische Messgrößen

Active
DAkkS D-K-19502-01-01 Furtwangen, DE
Frequenz - Gleichspannung Spannungsquellen 5 µV 1 mV Messgeräte > 10 mV + 3 more
View Profile

FIBRECOUNT France

Active
COFRAC 1-6017 Marseille, FR
DIN 51750-3 NF X 43-269 – NF X 43-050 NF X43-050 (parties utiles de la DIN EN 15002
View Profile

FILK Freiberg Institute g

Active
DAkkS D-PL-17362-01-01 Freiberg, DE
DIN ISO 48-4 ISO 21527-1 ISO 21527-2 DIN EN ISO 527-3 rs2066844 + 3 more
View Profile

FIRA International

Active
UKAS 0174 Stevenage, GB
BS 7177 BS 5852 DIN EN 597-1 BS 6807:1986 DIN EN 597-2 + 3 more
View Profile

FIS Frankfurter Industrieservice Gesellschaft mit beschränkter Haftung Labor für Chemische Analytik, Mikrobiologie, Krankenhaushygiene, Gasanalytik

Active
DAkkS D-PL-14358-01-01 Frankfurt (Oder), DE
DIN EN ISO 5667-1 (A 4) DIN 38402-A 11 DIN 38402-A 12 DIN ISO 5667-5 (A 14) DIN EN ISO 5667-6 (A 15) + 3 more
View Profile

FLANDRES Analyses

Active
COFRAC 1-1185 Capelle-La-Grande, FR
NF T90-111 DIN EN ISO 17294-2 DIN EN ISO 14403-2 NF EN ISO 19340 DIN EN ISO 10304-1 + 3 more
View Profile

FLASHLAB - Site d'Illkirch

Active
COFRAC 1-5765 Illkirch-Graffenstaden, FR
NF X 43-269 NF X 43-050 NF X43-050 (parties utiles de
View Profile

FLASHLAB - Site de Longjumeau

Active
COFRAC 1-5952 Longjumeau, FR
DIN EN 13001-1 NF X 43-269 NF X43-050 (parties utiles de NF X 43-275 NF X 43-257 + 3 more
View Profile

FLASHLAB NORD

Active
COFRAC 1-6979 Lezennes, FR
NF X 43-050 NF X 43-050 (parties utiles NF X 43-269 - Annexe
View Profile

No matching labs found.

Industries

Machinery and equipment manufacturing HVAC and ventilation systems Power generation equipment Construction and demolition equipment Consumer appliance manufacturers

Related Standards

  • ISO 3743-1 Acoustics — Determination of sound power levels of noise sources — Part 1: Reverberation room method
  • ISO 3744 Acoustics — Determination of sound power levels of noise sources — Engineering method using an enveloping surface
  • ISO 3745 Acoustics — Determination of sound power levels of noise sources — Precision method using an enveloping surface

Other Test Methods

0 labs selected
Compare