ISO 3744

Sound power — enveloping surface engineering method

ISO 3744 specifies the engineering method for determining sound power and sound energy levels using sound pressure measurements obtained on an imaginary surface (hemispherical or parallelepiped) surrounding a noise source. This method is widely used for in-situ testing of machinery, industrial equipment, and large installations where reverberation room testing is impractical. It provides a practical balance between accuracy and field applicability, making it suitable for machinery compliance testing, environmental noise assessments, and product CE marking requirements across the EU. ISO 17025 accreditation confirms laboratory proficiency in sound field measurement, environmental parameter correction, and uncertainty quantification for this complex measurement method.

What it measures

  • Sound power level (Lw) using enveloping surface pressure data
  • A-weighted and frequency-weighted sound power
  • Octave and one-third-octave band sound power (63 Hz to 8 kHz)
  • Environmental and measurement corrections
  • Sound power directivity and spatial variability
🇩🇪 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 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
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DAkkS D-K-21980-02-01 Hennigsdorf, DE
Kraft 50 N Sound power — survey method (ISO 3746) > 200 N Railway brake — automatic variable load 0,2 kN + 1 more
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DAkkS D-K-20515-01-00 Filderstadt, DE
Temperaturmessgrößen auch direktanzeigend 35 °C direktanzeigende > 200 °C auch direktanzeigend Temperaturmessgrößen −35 °C + 3 more
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MK-Kalibrierlabor

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MLL MVZ

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DIN EN 50178: 1998 DIN EN ISO 2813 DIN EN ISO 4628-4 DIN EN ISO 10456 DIN EN ISO 12572 + 3 more
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IEC 62570 DIN 13273-7
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MTS Systems (Germany)

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MVZ (Medizinisches Versorgungszentrum) am Klinikum Passau GmbH Institut für Labor- und Transfusionsmedizin

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MN (mononukleare Zellen) Blutbild klein Thrombozyten Hämoglobin Natriumchlorid + 3 more
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Basophile Eosinophile Erythrozyten Hämatokrit Hämoglobin + 3 more
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DAkkS D-ML-13256-01-01 Bad Salzuflen, DE
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Industries

Industrial machinery manufacturers Construction equipment producers HVAC and ventilation systems Power generation and compressor suppliers Large transport and handling equipment makers

Related Standards

  • ISO 3740 Acoustics — Determination of sound power levels of noise sources — General guidelines
  • ISO 3743-1 Acoustics — Determination of sound power levels of noise sources — Part 1: Reverberation room method
  • ISO 3745 Acoustics — Determination of sound power levels of noise sources — Precision method using an enveloping surface

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