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

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BSI á Íslandi ehf

UKAS 0823 Reykjavik 104, IS

Nominal value TEMPERATURE See Notes 1 to 3 TORQUE Case Manager: BC4 + 1 more

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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