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
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NBN EN ISO 3740
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DIN EN ISO 3740
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BS EN ISO 3740
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NF EN ISO 3740
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UNI EN ISO 3740
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UNE EN ISO 3740
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NEN EN ISO 3740
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NBN EN ISO 3744
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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
Power tool and equipment manufacturersLaboratory and medical device makersSmall machinery producersConsumer electronics manufacturersHeating and ventilation equipment suppliers
Related Standards
ISO 3740Acoustics — Determination of sound power levels of noise sources — General guidelines
ISO 3744Acoustics — Determination of sound power levels of noise sources — Engineering method using an enveloping surface
ISO 354Acoustics — Measurement of sound absorption coefficient in a reverberation room
Scope