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-ML-13235-01-00 Kaiserslautern, DE
freies Protein S vWF-Aktivität (Ristocetin) Methylmalonsäure Amiodaron/Desethylamiodaron Ethosuxemid + 3 more
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angeborener Chromosomensatz erworbener Chromosomensatz Aarskog-Scott Syndrom Laborpanel 1 FGD1 + 3 more
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DAkkS D-ML-20912-01-00 Köln, DE
B-Zellzahl (Immunstatus T-Non-Hodgkin-Lymphome Akute myeloische Leukämie Akute lymphatische Leukämie Multiples Myelom (Plasmazellen) + 3 more
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DAkkS D-ML-13073-01-00 Köln, DE
Automatisches Blutbild Differentialblutbild, prozentual Retikulozyten Zellzahl Natriumchlorid + 3 more
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DAkkS D-ML-13413-01-00 Leverkusen, DE
Blutsenkung Thrombozytenfunktion Ecstasy, Kokain, Opiate, Methadon, Bupre qualitativ, quantitativ Drogenscreening (Amphetamine + 3 more
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DAkkS D-ML-20454-01-01 Bonn, DE
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DAkkS D-ML-20295-01-00 Berlin, DE
Basophile absolut Basophile % Eosinophile absolut Eosinophile % Erythrozyten + 3 more
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DAkkS D-ML-22580-01-00 Oldenburg, DE
Unklare Erkrankungen mit wahrscheinlich erblicher Ursache HPO Terms; SNV, CNV Fluoropyrimidin Toxizität (DPD-Gen: dbSNP rs3918290, rs55886062, rs67376798, + 3 more
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Amphetamine Barbiturate Benzodiazepine Buprenorphin, Norbuprenorphin Cocainmetabolite + 3 more
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DAkkS D-ML-13245-01-01 Dresden, DE
angeborener Chromosomensatz Nummerische Veränderungen Chromosomen 13, 18, 21, X und ldentifizierung kleinster chromosomaler/numerischer + 3 more
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DAkkS D-ML-13245-02-00 Dresden, DE
Multiplate-Analyse (TRAP, ADP) Thrombozytenaggregation Born) Organische Säuren (Profil) Metanephrin, Normetanephrin + 3 more
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DAkkS D-ML-22497-01-00 Greifswald, DE
Familiäre Adenomatöse Polyposis Syndrome (APC, MUTYH) STK11, SMAD4 ), TruRisk® -Panel [SNV, CN Familiäre Polyposis-Syndrome [FAP] (APC, MUTYH) + 3 more
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DAkkS D-ML-17445-01-00 Dessau-Roßlau, DE
WBC (Leukozyten) RBC (Erythrocyten) HGB (Hb) HCT (Hk) PLT (Thrombozyten) + 3 more
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DAkkS D-ML-18902-01-00 Rostock, DE
Chromosomensatz (angeboren) Chromosomensatz (erworben) Adrenogenitales Syndrom Angelman-Syndrom (15q11-Region, UBE3A) Mikrodeletionen; AZFa-c) + 3 more
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DAkkS D-ML-13237-01-00 Raubling, DE
HbA1c Basophile, automatisch Eosinophile, automatisch Erythrozyten, automatisch Leukozyten, automatisch + 3 more
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DAkkS D-ML-19175-01-00 Erfurt, DE
HbA1c Hämatokrit Hämoglobin Leukozyten Thrombozyten + 3 more
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DAkkS D-ML-18008-01-00 Raunheim, DE
HbA1c Blutbild, groß (Blutbild klein Hämoglobin, Hämatokrit, MCH, MCHC) Retikulozyten Thrombozyten + 3 more
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DAkkS D-ML-13182-01-00 Essen, DE
Leukozyten Erythrozyten Thrombozyten Hämatokrit MCV + 3 more
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DAkkS D-ML-13238-01-01 Göttingen, DE
Obligat anaerobe Bakterien Grampositive aerobe und anaerobe Kokken Enterokokken Mikrokokken + 3 more
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DAkkS D-ML-13445-01-01 Wernigerode, DE
automatische Zelldifferenzierung Erythrozyten Leukozyten Retikulozyten Thrombozyten + 3 more
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DAkkS D-K-15048-01-01 Allmersbach im Tal, DE
Parallelendmaße * 0,5 mm DIN EN ISO 3650:1999 Parallelendmaße > 100 mm Messschieber für Außen-, 0 mm + 3 more
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DAkkS D-K-21403-01-01 Aichhalden, DE
Metrosoft CM, Software einer Raumdiagona AG, Chur, CH ≤ 3333 mm Oberkochen, D GmbH, Wetzlar, D AG, Chur, CH ≤ 7500 mm
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DAkkS D-K-19120-01-01 Gießen, DE
Flüssigkeitsvolumen * Kolbenhubpipetten Manuell betätigte spritzen Mehrfachdispenser + 3 more
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DAkkS D-K-15086-01-01 Wedel, DE
- Gleichspannung Messverstärker > 120 mV > 1 V > 12 V > 1000 V + 3 more
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DAkkS D-K-19573-01-00 Gefell, DE
Akustische Messgrößen Messmikrofone nach (DIN EN 61094-4:1996) Schalldruckpegel (Druck) Empfangsübertragungsmaß + 3 more
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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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