ISO 3743-1

Sound power — reverberation field engineering method

ISO 3743-1 specifies the reverberation room method for determining sound power levels of noise sources, suitable for smaller sources or laboratory environments where sound pressure is measured in a reverberant acoustic field. The method is applicable across a wide frequency range and is commonly used for equipment testing, product compliance assessment, and environmental noise impact studies. This engineering-level method balances accuracy with practical testing constraints and is widely required for EU noise directive compliance and product CE marking. Accreditation demonstrates laboratory control of environmental conditions, proper instrumentation calibration, and competence in complex acoustic data analysis.

What it measures

  • Sound power level (Lw) using sound pressure in reverberation room
  • A-weighted and frequency-weighted sound power
  • Octave band sound power levels (31.5 Hz to 8 kHz)
  • Sound power uncertainty and test environment correction
  • Directional sound power characteristics
🇩🇪 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 3744 🇬🇧 BS EN ISO 3744 🇫🇷 NF EN ISO 3744 🇮🇹 UNI EN ISO 3744 🇪🇸 UNE EN ISO 3744 🇳🇱 NEN EN ISO 3744
1,670 Accredited labs
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DAkkS D-ML-21458-02-01 Mainz, DE
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angeborener Chromosomensatz Molekularzytogenetische Analyse CDKN2C(1p32.3 )/CKS1B ( 1q21-22) Amplifikation, Deletion, Rearrangement, TCF3(11q23)/PBX(11q23)(19p13.3) + 3 more
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DAkkS D-ML-13351-01-00 Koblenz, DE
Faktor XIII Antigen Adrenalin/Noradrenalin/ Dopamin Amiodaron/ Amiodaron, Desethylamiodaron + 3 more
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DAkkS D-ML-22817-01-01 Würzburg, DE
3-Methoxytyramin Amisulprid Amitriptylin, Nortriptylin Aripiprazol, Dehydroaripiprazol Bupropion, 10-OH-Bupropion + 3 more
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DAkkS D-ML-22061-01-01 Neu-Ulm, DE
*) 1 bar; 2 bar Spinobulbäre Muskelatrophie (Typ Kennedy) AZFa-c Azoospermiefaktor + 3 more
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DAkkS D-ML-18244-01-01 Altenburg, DE
Thrombozytenfunktion Thrombozytenfunktionstest Automatisches Blutbild automatische Leukozytendifferenzierung + 3 more
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DAkkS D-K-19647-01-00 Köln, DE
Magnetische Feldstärke Referenzmagnetsystem Magnetische Flussdichte dichtemessgerät Magnetisches Moment + 3 more
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Mahr

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eingängige zylindrische Einstellringe * 10 mm Railway braking — adhesion under braking Rundheitsabweichung Prüfstifte * 0,14 mm + 3 more
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MFPA

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DAkkS D-K-11267-01-00 Braunschweig, DE
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DAkkS D-PL-11220-01-01 Hannover, DE
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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
Ovarialkarzinom (ATM, BRCA1, BRCA2, BRIP RAD51C; RAD51D; TP53) Cystische Fibrose Panel (CFTR) Cystische Fibrose gezielt + 2 more
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DAkkS D-ML-22296-01-01 Augsburg, DE
25-OH-Vitamin D Stimulation mit Antigenen (Aspergillus 1 / 2, Babesia Bartonella henselae, Candida albicans, Chlamydia pneumoniae, Chlamydi + 3 more
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DAkkS D-ML-13168-08-01 Hannover, DE
Thrombozytenaggregationstest IgG Antikörper gegen Kollagen HLA-DR ADP Ristocetin + 3 more
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DAkkS D-ML-13168-03-00 Hannover, DE
Echinococcus-Antikörper Haemophilus influenzae Phänotypisierung Thrombozytäre Antikörper Salmonellen-Typisierung + 3 more
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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
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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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Industries

Power tool and equipment manufacturers Laboratory and medical device makers Small machinery producers Consumer electronics manufacturers Heating and ventilation equipment suppliers

Related Standards

  • ISO 3740 Acoustics — Determination of sound power levels of noise sources — General guidelines
  • ISO 3744 Acoustics — Determination of sound power levels of noise sources — Engineering method using an enveloping surface
  • ISO 354 Acoustics — Measurement of sound absorption coefficient in a reverberation room

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