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
1,670 Accredited labs
18 Countries

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Ebenheitsabweichung verkörperungen z.B. platten nach DIN 876:1984 Geradheitsabweichung ebener Flächen, z.B. + 3 more
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DAkkS D-K-21417-01-01 Albstadt, DE
Außengewinde Flankendurchmesser 3 mm bis 100 mm 0,5 mm bis 6 mm) unsymmetrischem Profil schiedlichen Ausgabeständen gestattet. + 3 more
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CD45 Percp+CD16+56+CD3 CD4 CD45 Percp+CD4+CD8 Adalimumab Anti-Adalimumab Antikörper + 3 more
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Jurjanz

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DAkkS D-K-15085-01-01 Schkeuditz, DE
Parallelendmaße aus 0,5 mm DIN EN ISO 3650:1999 Parallelendmaße aus > 100 mm Messschieber für 1350 mm + 3 more
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DAkkS D-K-17233-01-00 Hochdorf-Assenheim, DE
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DAkkS D-PL-22093-01-00 Ratingen, DE
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DAkkS D-PL-12091-01-01 Forchtenberg, DE
IEC 61000-4-2: 2008 IEC 61000-4-3: 2006 IEC 61000-4-4: 2012 IEC 61000-4-5: 2005 IEC 61000-4-6: 2013 + 3 more
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DAkkS D-K-19408-01-01 Balingen, DE
nichtselbsttätige − Waagen Festkörpervolumen Wägewert/ Masse oder + 3 more
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Kessler QMP

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DAkkS D-K-15118-01-01 Friedewald, DE
Parallelendmaße * 0,5 mm DIN EN ISO 3650:1999 Parallelendmaße * Einstelldorne * 1 mm Railway maintenance — track geometry (EN + 3 more
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DAkkS D-K-15127-01-01 Sindelfingen, DE
Beschleunigung* Beschleunigungsmessketten (Bezugsfrequenzen) (Mittelfrequenzbereich) Beschleunigungsaufnehmer, 0,1 m/s + 3 more
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DAkkS D-K-15181-01-01 Boxberg-Unterschüpf, DE
Parallelendmaße * 0,5 mm DIN EN ISO 3650:1999 Lehrdorne Durchmesser * 1 mm Prüfstifte + 3 more
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Kiwa

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DAkkS D-PL-11217-01-02 Berlin, DE
DIN EN ISO 7438 DIN 50100 ISO 9352 DIN ISO 48-4 DIN EN ISO 1675 + 3 more
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Kiwa Primara

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Klingelnberg

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DAkkS D-ML-19856-01-00 Ingolstadt, DE
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DAkkS D-ML-13265-01-00 Nürnberg, DE
Antidepressiva 1: Metabolit, Paroxetin, Fluvoxamin Antidepressiva 2: Antiepileptika: Carbazepin, Sultiam, Lamotrigin + 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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