ISO 3747:2010

Sound Power Level — In-Situ Reference Source Method

This engineering/survey method determines sound power levels using a calibrated reference sound source to account for acoustic environmental conditions during in-situ measurements. It is particularly useful for large or immobile equipment where laboratory testing is impractical, and for on-site verification of noise compliance. The reference source approach compensates for acoustic environmental effects, improving accuracy compared to basic survey methods. Accreditation ensures proper reference source maintenance and measurement protocols are followed. This method is essential for field acceptance testing and environmental noise assessments.

What it measures

  • Sound power level (Lw) referenced to 1 pW
  • A-weighted and frequency-weighted sound power
  • Environmental acoustic correction factors
  • In-situ acoustic performance
🇩🇪 DIN EN ISO 3746 🇬🇧 BS EN ISO 3746 🇫🇷 NF EN ISO 3746 🇮🇹 UNI EN ISO 3746 🇪🇸 UNE EN ISO 3746 🇳🇱 NEN EN ISO 3746 🇩🇪 DIN EN ISO 9614-1 🇬🇧 BS EN ISO 9614-1 🇫🇷 NF EN ISO 9614-1 🇮🇹 UNI EN ISO 9614-1 🇪🇸 UNE EN ISO 9614-1 🇳🇱 NEN EN ISO 9614-1
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DAkkS D-PL-14358-01-01 Frankfurt (Oder), DE
DIN EN ISO 5667-1 (A 4) DIN 38402-A 11 DIN 38402-A 12 DIN ISO 5667-5 (A 14) DIN EN ISO 5667-6 (A 15) + 3 more
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DAkkS D-ML-13133-01-01 Weißwasser, DE
Abetalipoproteinämie (MTTP) Achondroplasie (FGFR3) Acoeruloplasminämie/Hypocoerulo plasminämie (CP) ACTH-unabhängige makronoduläre + 3 more
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Feinmess Suhl

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DAkkS D-K-15131-01-00 Suhl, DE
Parallelendmaße 0,5 mm bis DIN EN ISO 3650:1999 Messschieber für 0 mm Außen-, Innen- und > 300 mm + 3 more
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DAkkS D-PL-21240-01-00 Lingen (Ems), DE
DIN EN 13725:2003-07 und Berichtigung
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DAkkS D-PL-11164-01-00 Aschheim, DE
DIN 32753-1
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DAkkS D-K-15088-01-00 Köln, DE
flexiblen Akkreditierungsbereich. Beschleunigung * 10 m/s Beschleunigungsaufnehmer Beschleunigungsaufnehmer 10 m/s digital (DTI) + 3 more
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DAkkS D-K-21624-01-01 Riedlingen, DE
Kraft (WPM) Vibration measuring instruments — test m Acoustics — tonality assessment (DIN 456 Härteprüfmaschinen Länge (WPM) + 3 more
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DAkkS D-PL-14116-01-00 Gräfelfing, DE
DIN EN ISO 8497 ISO 8301 ISO 8302 DIN EN 12664 DIN EN 12667 + 3 more
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DAkkS D-ML-21105-01-01 Penzberg, DE
(somatische genetische ACVR1B, AKT1, AKT2, AKT3, ALOX12B, AMER1 GATA3, GATA4, GATA6, GID4, GNA11,GNA13, CHEK2, CHIC2, CHN1, CIC, CIITA IRF8, IRS2, ITK, JAK1, JAK2, JAK3, JARID + 3 more
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DAkkS D-PL-21039-04-04 Erlangen, DE
DIN EN ISO 10304-1 DIN EN ISO 11885 DIN EN ISO 15350 DIN EN ISO 15351 DIN EN ISO 17294-2 + 3 more
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DAkkS D-K-21039-01-00 Erlangen, DE
- Gleichspannung Messgeräte 0,33 V bis < 3,3 V 330 V Quellen > 0,1 V + 3 more
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DAkkS D-K-17452-01-00 Schalkau, DE
Kraft (WPM) 30 N Vibration measuring instruments — test m maschinen nach DIN Kraft * 10 N Acoustics — tonality assessment (DIN 456 + 3 more
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DAkkS D-PL-11140-11-01 Stuttgart, DE
DIN EN ISO 717-1 DIN EN ISO 717-2 DIN EN ISO 10140-1 DIN EN ISO 10140-2 DIN EN ISO 10140-3 + 3 more
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DAkkS D-PL-11140-14-00 Braunschweig, DE
DIN ISO 16000-3 DIN EN ISO 12460-3 DIN EN ISO 12460-4 DIN EN ISO 12460-5 100 HV 120 + 3 more
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DAkkS D-K-11140-02-00 Freiburg, DE
Tensile testing of metallic materials (I Vickers hardness test (ISO 6507) Kurzschlussstrom Solarmodule 16 mA Gleichstrom- und Nieder- 10 mV + 3 more
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DAkkS D-K-15109-01-01 Titisee-Neustadt, DE
Druck * Absolutdruck Pabs 1 bar; 3 bar Negativer und positiver Überdruck + 3 more
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DAkkS D-PL-14170-01-03 Hamburg, DE
DIN EN 12579 DIN 19698-1 DIN 19698-2 DIN 51750-2 DIN ISO 11277 + 3 more
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DAkkS D-PL-19633-01-00 Dresden, DE
DIN 38402-A 12 DIN EN ISO 5667-6 (A 15) DIN 38402-A 30 DIN EN ISO 5667-13 (S 1) DIN 38414-S 11 + 3 more
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GHMT

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DAkkS D-PL-17559-01-00 Bexbach, DE
DIN EN 50173-1 DIN EN 50173-2 DIN EN 50173-3 DIN EN 50173-4 DIN EN 50173-5 + 3 more
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DAkkS D-PL-17563-01-00 Stuhr, DE
DIN EN 12469 BS 5726-1 DIN 1946-4 DIN EN 12599 DIN 12980 + 1 more
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DAkkS D-PL-11085-01-00 Frankfurt am Main, DE
DIN 51757 DIN EN ISO 12185 DIN EN ISO 3405 DIN EN 13016-1 DIN EN 237 + 3 more
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DAkkS D-K-11243-01-00 Stade, DE
Koordinatenmesstechnik Lasertracker* 0,5 m 1) In den CMC sind die erweiterten Messu Bügelmessschrauben* 0 mm + 3 more
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GMC-I Service

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DAkkS D-K-20313-01-01 Nürnberg, DE
- Gleichspannung Messgeräte > 0,22 V > 2,2 V > 11 V > 22 V + 3 more
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DAkkS D-PL-14479-01-00 Würzburg, DE
DIN EN ISO 5667-1 (A 4) DIN 38402-A 11 DIN 38402-A 12 DIN 38402-A 13 DIN EN ISO 5667-6 (A 15) + 3 more
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DAkkS D-ML-13406-01-00 Rüsselsheim, DE
Erythrozytenzahl Hämatokrit Leucozytendifferenzierung Leucozytenzahl MCV + 3 more
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Industries

Large industrial machinery and installation testing Environmental noise assessment and monitoring Building and construction equipment Transportation and railway noise evaluation Ventilation and HVAC system commissioning

Related Standards

  • ISO 3746 Determination of sound power levels of noise sources using sound pressure — Survey method
  • ISO 9614-1 Determination of sound power levels of noise sources by sound intensity — Part 1: Measurement at discrete points
  • ISO 12639 Acoustics — Reference sound sources for in-situ calibration of sound pressure and sound intensity measurement apparatus

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