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
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DIN EN ISO 3743-1
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BS EN ISO 3743-1
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NF EN ISO 3743-1
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UNI EN ISO 3743-1
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UNE EN ISO 3743-1
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NEN EN ISO 3743-1
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DIN EN ISO 3744
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BS EN ISO 3744
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NF EN ISO 3744
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UNI EN ISO 3744
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UNE EN ISO 3744
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NEN EN ISO 3744
Machinery and equipment manufacturingHVAC and ventilation systemsPower generation equipmentConstruction and demolition equipmentConsumer appliance manufacturers
Related Standards
ISO 3743-1Acoustics — Determination of sound power levels of noise sources — Part 1: Reverberation room method
ISO 3744Acoustics — Determination of sound power levels of noise sources — Engineering method using an enveloping surface
ISO 3745Acoustics — Determination of sound power levels of noise sources — Precision method using an enveloping surface
Scope