ISO 3746:2010

Sound Power Level — Survey Method

This test determines sound power levels of noise sources using an enveloping measurement surface and sound pressure level measurements. It is a survey-grade method suitable for field measurements of machinery, equipment, and industrial sources in moderately reflective environments. The method is widely used for noise compliance verification, product development, and environmental impact assessments. Accredited testing ensures consistent, defensible results for regulatory compliance and product labeling. This method bridges the gap between laboratory-grade precision and practical field measurements.

What it measures

  • Sound power level (Lw) in decibels
  • A-weighted and frequency-weighted sound power
  • Directional sound power distribution
  • Acoustic performance of noise sources
🇩🇪 DIN EN ISO 3744 🇬🇧 BS EN ISO 3744 🇫🇷 NF EN ISO 3744 🇮🇹 UNI EN ISO 3744 🇪🇸 UNE EN ISO 3744 🇳🇱 NEN EN ISO 3744 🇩🇪 DIN EN ISO 3745 🇬🇧 BS EN ISO 3745 🇫🇷 NF EN ISO 3745 🇮🇹 UNI EN ISO 3745 🇪🇸 UNE EN ISO 3745 🇳🇱 NEN EN ISO 3745
1,670 Accredited labs
18 Countries

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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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Metrolution

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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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DAkkS D-K-20451-01-00 Bovenden, DE
Konventioneller Wägewert/ Massenormale Charpy impact test (ISO 148-1) Salt spray / neutral salt fog test (ISO + 3 more
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DAkkS D-ML-19288-01-00 Stuttgart, DE
Bacillus cereus Toxin Clostridium perfringens Salmonella spp. Shigella spp. Staphylococcus aureus Toxin + 3 more
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DAkkS D-K-15096-01-00 Neuss, DE
Parallelendmaße 0,5 mm DIN EN ISO 3650:1999 Parallelendmaße > 10 mm Parallelendmaße > 100 mm + 3 more
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DAkkS D-K-21161-01-01 Esslingen, DE
Gleichspannung 3 mV Messgeräte 10 mV > 100 mV > 220 mV > 11 V + 3 more
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DAkkS D-PL-12005-01-01 Itzehoe, DE
IEC 61000-4-7 IEC 61000-4-15 IEC 61000-4-30 IEC 61400-21 IEC 61400-21-1 + 3 more
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DAkkS D-K-11292-01-00 Buchen Odenwald, DE
Temperatur 50 °C Railway brake handbooks (UIC 547) 1) In den CMC sind die erweiterten Messu
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DAkkS D-PL-19306-01-00 Oppenweiler, DE
IEC 61000-4-2: 2008 VDE 0847-4-2 IEC 61000-4-3: 2006 VDE 0847-4-3 IEC 61000-4-4: 2012 + 3 more
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DAkkS D-ML-20225-01-00 Minden, DE
Differentialblutbild Kleines Blutbild (maschinell) Thrombozyten Unreife Thrombozyten (IPF) Urinsediment (maschinell) + 3 more
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DAkkS D-PL-22339-02-01 Planegg, DE
DIN EN ISO 717-1 DIN EN ISO 717-2 DIN EN ISO 10140-2 DIN EN ISO 10140-4 DIN EN ISO 10140-5 + 3 more
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DAkkS D-K-14119-01-00 Planegg, DE
Pistonfonen und von Schallkalibratoren Pistonphonen und von (bezogen auf 20 µPa 31,5 Hz bis 16 kHz (bezogen auf 1 V/Pa) + 3 more
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DAkkS D-PL-14119-01-01 Planegg, DE
DIN 4150-1 DIN 4150-2 DIN 4150-3 DIN ISO 8297 DIN EN ISO 12354-4 + 3 more
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DAkkS D-ML-13106-01-01 München, DE
Hämoglobin A1c Hämoglobin-Differenzierung Erythrozyten Basophile Granolozyten Eosinophile Granulozyten + 3 more
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NATEC Sensors

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DAkkS D-K-15139-01-01 Garching, DE
Railway brakes — conditions for homologa − Durchfluss von Flüssigkeiten Gleichspannung U (Simulation des Signals generators) + 3 more
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DAkkS D-K-17726-01-00 Pfullingen, DE
Elektrische Feldstärke / 2 V/m 2,5 V/m 1 V/m Magnetische Feldstärke / + 3 more
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DAkkS D-PL-17693-02-01 Hannover, DE
DIN EN ISO 15061 (D 34) DIN EN 27888 (C 8) DIN EN 1484 (H 3) ISO 5667-21 DIN 38404-C 10 + 3 more
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Industries

Industrial machinery and equipment manufacturing Environmental noise consulting Construction and power tool equipment HVAC and ventilation systems Occupational health and safety

Related Standards

  • ISO 3744 Determination of sound power levels of noise sources using sound pressure — Precision method in anechoic and hemi-anechoic rooms
  • ISO 3745 Determination of sound power levels of noise sources using sound pressure — Precision grade method for anechoic rooms and free fields over a reflecting plane
  • ISO 3747 Determination of sound power levels of noise sources using sound intensity — In-situ method using a reference sound source
  • ISO 9614-1 Determination of sound power levels of noise sources by sound intensity — Part 1: Measurement at discrete points

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