ISO 3744

Sound power — enveloping surface engineering method

ISO 3744 specifies the engineering method for determining sound power and sound energy levels using sound pressure measurements obtained on an imaginary surface (hemispherical or parallelepiped) surrounding a noise source. This method is widely used for in-situ testing of machinery, industrial equipment, and large installations where reverberation room testing is impractical. It provides a practical balance between accuracy and field applicability, making it suitable for machinery compliance testing, environmental noise assessments, and product CE marking requirements across the EU. ISO 17025 accreditation confirms laboratory proficiency in sound field measurement, environmental parameter correction, and uncertainty quantification for this complex measurement method.

What it measures

  • Sound power level (Lw) using enveloping surface pressure data
  • A-weighted and frequency-weighted sound power
  • Octave and one-third-octave band sound power (63 Hz to 8 kHz)
  • Environmental and measurement corrections
  • Sound power directivity and spatial variability
🇩🇪 DIN EN ISO 3740 🇬🇧 BS EN ISO 3740 🇫🇷 NF EN ISO 3740 🇮🇹 UNI EN ISO 3740 🇪🇸 UNE EN ISO 3740 🇳🇱 NEN EN ISO 3740 🇩🇪 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
1,868 Accredited labs
20 Countries

Showing 1,126–1,150 of 1,868 labs

DAkkS D-K-19647-01-00 Köln, DE
Magnetische Feldstärke Referenzmagnetsystem Magnetische Flussdichte dichtemessgerät Magnetisches Moment + 3 more
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DAkkS D-K-15074-01-01 Göttingen, DE
eingängige zylindrische Einstellringe * 10 mm Railway braking — adhesion under braking Rundheitsabweichung Prüfstifte * 0,14 mm + 3 more
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UKAS 28563 Driffield, GB
ISO 6579-1 ISO 21528-2 ISO 16649-2 TP/007 based on BS ISO ISO 11290-2 + 3 more
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DAkkS D-PL-11143-01-01 Weimar, DE
DIN EN 62196-1: 2015 DIN EN 196-3 DIN EN 196-6 DIN EN 196-7 DIN EN 196-8 + 3 more
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Kraft (WPM) * Kalibrierung der Prüfkraftmesseinrichtung Machinery vibration — industrial machine 0,01 N + 3 more
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DAkkS D-K-11267-01-00 Braunschweig, DE
Länge (WPM) Vibration measuring instruments — test m 0,1 mm Vibration measurements near traffic — me Härteprüfmaschinen nach + 3 more
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DAkkS D-PL-11267-01-00 Braunschweig, DE
DIN EN 932-1 DIN EN 932-2 DIN EN 933-1 DIN EN 933-2 DIN EN 933-4 + 3 more
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DAkkS D-PL-11220-01-01 Hannover, DE
DIN EN 17468-1 DIN 18516-1 DIN EN 12350-1 DIN EN 12350-2 DIN EN 12350-4 + 3 more
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DAkkS D-PL-11142-01-01 Dortmund, DE
DIN EN ISO 15630-1 DIN EN ISO 15630-2 DIN EN ISO 15630-3 DIN EN 274-1 VDE 0847-4-2 + 3 more
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DAkkS D-ML-22182-01-00 Leipzig, DE
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DAkkS D-ML-22296-01-01 Augsburg, DE
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DAkkS D-ML-13168-08-01 Hannover, DE
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DAkkS D-ML-13168-09-00 Hannover, DE
ABO-System lsoagglutinine (Serumeigenschaften) Rh-Merkmal D Kell-Merkmal K + 3 more
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DAkkS D-ML-13168-02-00 Hannover, DE
Toxoplasma gondii -Ak Treponema pallidum-AK Herpes-Simplex-Viren, Typen 2, Aciclovir-Resistenz Adenoviren + 3 more
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DAkkS D-ML-22843-01-01 Cottbus, DE
D-Dimer Gerinnungsfaktor XIII Protein S Fibrinmonomere Oligosaccharide + 3 more
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DAkkS D-ML-22843-02-00 Cottbus, DE
Aspergillus-Antikörper Brucella-Antikörper Candida dubliniensis Candida-Antikörper Cryptococcus Antigen + 3 more
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DAkkS D-ML-22289-01-00 Heppenheim (Bergstraße), DE
ALOT AML-ED/MRD BPDCN B-ALL-ED/MRD T-ALL-ED/MRD + 3 more
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DAkkS D-ML-13288-01-00 Bautzen, DE
Basophile Blutbildmessung (Automat) Eosinophile Erythrozyten Basophile Granulozyten + 3 more
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DAkkS D-ML-13288-02-01 Dresden, DE
Basophile Blutbildmessung (Automat) Eosinophile Erythrozyten Basophile Granulozyten + 3 more
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DAkkS D-ML-13291-01-00 Magdeburg, DE
Metanephrin, Normetanephrin VMS, 5-HIES, HVS 10-OH-Carbazepin 3-Methoxytyramin 9-OH-Risperidone + 3 more
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DAkkS D-ML-13414-01-00 Rostock, DE
PFA-Verschlusszeit 3-Methoxytyramin 5-Hydroxyindolessigsäure Adrenalin Dopamin + 3 more
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DAkkS D-ML-20110-01-01 Zwickau, DE
10-Hydroxycarbazepin (Eslicarbazepin) Amiodaron, Desmethylamiodaron CDT Amiodaron, Desethylamiodaron + 3 more
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DAkkS D-ML-13374-01-00 Kaiserslautern, DE
SNV-Genotypisierung (Nachweis Antithrombin-III-Mangel (in-house) (SERPINC1-Gen [OMIM *107300]) HIV-Wirtsresistenz + 3 more
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DAkkS D-ML-13078-01-00 Bielefeld, DE
Thrombozytenaggregation (induzierte) Carbazepin) 3-Methoxytyra min, freies 5-Hydroxy-lndolessigsäure + 3 more
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Industries

Industrial machinery manufacturers Construction equipment producers HVAC and ventilation systems Power generation and compressor suppliers Large transport and handling equipment makers

Related Standards

  • ISO 3740 Acoustics — Determination of sound power levels of noise sources — General guidelines
  • ISO 3743-1 Acoustics — Determination of sound power levels of noise sources — Part 1: Reverberation room method
  • ISO 3745 Acoustics — Determination of sound power levels of noise sources — Precision method using an enveloping surface

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