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
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DAkkS D-ML-13008-09-01 Berlin, DE
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DIN EN ISO 5136 DIN EN ISO 12354-4 DIN 45635-1 DIN 45635-14 DIN 45635-38 + 3 more
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DAkkS D-K-11081-02-01 Chemnitz, DE
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DAkkS D-PL-11072-01-01 Freiberg, DE
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DAkkS D-K-17567-01-01 Lauf a. d. Pegnitz, DE
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DAkkS D-PL-17438-01-04 Stuttgart, DE
IEC 60335-1: 2010 IEC 60335-2-2 IEC 60335-2-3 DIN EN 60335-2-3: 2002 IEC 60335-2-4 + 3 more
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DAkkS D-K-21738-01-01 Köln, DE
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DIAL

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DAkkS D-PL-17358-02-00 Lüdenscheid, DE
DIN 5032-1 DIN 5032-2 DIN 5032-4 DIN 5033-8 DIN 5036-3 + 3 more
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DIANOVIS

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DAkkS D-ML-21243-01-01 Gera, DE
Kleines Blutbild (maschinell) Differentialblutbild (maschinell) Thrombozyten Retikulozyten Natriumchlorid + 3 more
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DAkkS D-K-15034-01-01 Gevelsberg, DE
Gleichspannung 10 mV Quellen > 100 mV > 1 V > 10 V > 100 V + 3 more
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DAkkS D-PL-11125-01-00 Nürnberg, DE
ASTM C 1166 IEC 60512-16-7 ID168 IEC 60512-16-9 AK gegen Sc1-70 + 3 more
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DAkkS D-ML-22411-01-00 Dresden, DE
Antikörper FILA-Klasse I Lymphozytäre Kreuzprobe E, -DRB1, -DQB1, -DPB1, DRB3/4/5, -DQA1, KIR MICA, MICB, CCR5832 + 3 more
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DAkkS D-ML-21979-01-00 Hamburg, DE
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DAkkS D-K-11134-03-00 Kaiser-Wilhelm-Koog, DE
− Stromstärkeverhältnis - Gleichspannung / Messgeräte - Wechselspannung Gleichstromstärke > 100 µA + 3 more
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DAkkS D-ML-17345-01-01 Frankfurt, DE
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DAkkS D-ML-17345-01-00 Frankfurt, DE
aller Untersuchungsverfahren im flexible Webpräsenz des Medizinischen Laboratoriu (VWF:CB) vWF-Multimere Erythrozyten + 3 more
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DAkkS D-ML-13219-01-01 Dresden, DE
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DAkkS D-ML-13219-01-00 Dresden, DE
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DAkkS D-ML-13461-01-01 Bad Kreuznach, DE
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DAkkS D-PL-20561-01-01 Witzenhausen, DE
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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

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