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
1,868 Accredited labs
20 Countries

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Air Surveys

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UKAS 0553 Wandsworth, GB
(HSG 248) – 2021 APP 7 based on HSG 248 (PCM) based on HSG 248 (PCM) based on HSG 248) APP 15 based on HSG 248 + 2 more
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Air Tightness & Building Energy Consultants

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UKAS 7486 Irvinestown, GB
BS EN ISO 16283-1:2014+A1:2017BS EN ISO BS EN ISO 140-4:1998 ISO 1407 ISO 7171 BS EN ISO 9972:2015 + 1 more
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Airborne Environmental Consultants

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UKAS 0232 Manchester, GB
(HSG 264, 2012)
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Airborne Environmental Consultants

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UKAS 2054 Manchester, GB
(HSG 248) – 2021 AEC 1 based on HSG 248 (PCM) based on HSG 248 AEC 6 based on HSG 248
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Airbus Defence and Space

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DAkkS D-K-18731-01-01 Manching, DE
- Gleichspannung / Messgeräte 1 µV Quellen > 1 V + 3 more
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Airsafe Analytical

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UKAS 4376 Alton, GB
(HSG 248) – 2021 (PCM) based on HSG 248
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Airtech Analysis

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UKAS 0681 Writtle, GB
(HSG 248) – 2021 (PCM) based on HSG 248 staining based on HSG 248 (HSG 264, 2012) Appendix 5 of HSG 227 (2004))
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Akustikberatung Wiemers

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DAkkS D-PL-11244-01-01 Berlin, DE
EN 14033-3 ISO 9611 ISO 11201
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Akustikbüro Dahms

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DAkkS D-PL-20065-01-00 Potsdam, DE
DIN 4150-1 DIN 4150-2 DIN 4150-3 DIN EN 61400-11
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Akustikbüro Göttingen - Alphei Püschel Rösler

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DAkkS D-PL-18995-01-00 Göttingen, DE
DIN 45645-2
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Akustikbüro K5

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DAkkS D-PL-20822-01-00 Berlin, DE
DIN EN IEC 60268-16 DIN VDE 0833-4
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Akustikbüro Krämer & Stegmaier

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DAkkS D-PL-11344-01-01 Berlin, DE
ISO 23351-1 ASTM E 1354 DIN EN ISO 717-1 DIN EN ISO 717-2 DIN EN ISO 3382-1 + 3 more
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Alfred H Knight Energy Services

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UKAS 1765 Kilmarnock, GB
BS ISO 18283:2022 ASTM D2234 (location E) ASTM D2013 (location B) BS ISO 5074:2015; and ASTM D409:2016 + 3 more
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Alkali Environmental

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UKAS 24303 South Milford, GB
BS EN ISO 16911-1:2013 using DIN EN 14181 DIN EN 13126-19 DIN EN 15058 DIN EN 14789 + 3 more
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Alleima

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DAkkS D-PL-11123-01-02 Werther (Westf.), DE
DIN EN ISO 6506-1 ASTM E 10-18 DIN EN ISO 6508-1 ASTM E 18-22 DIN EN ISO 6507-1 + 3 more
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Allgäuer Messzentrum

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DAkkS D-K-19562-01-01 Kaufbeuren, DE
Durchmesser 1 mm 510 mm Rundheitsabweichung 1 mm Parallelitätsabweichung Rundheitsabweichung + 3 more
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Allied Aerosystems

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UKAS 0666 Pontypridd, GB
DC Resistance 2.92 mm systems (continued) DC VOLTAGE AC CURRENT DC Power + 3 more
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Allium Environmental

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UKAS 6093 Scorrier, GB
(HSG 248) – 2021 (PCM) based on HSG 248
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Allium Environmental

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UKAS 0212 Redruth, GB
(HSG 264, 2012)
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Ambientale srl

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ACCREDIA 00902 Lecce, IT
DIN EN 1484 EPA 8260 DIN EN 17892 EPA 3510 UNI 10506 + 3 more
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Ambulanzzentrum des UKE GmbH Fachbereich Humangenetik

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DAkkS D-ML-19804-02-00 Hamburg, DE
5-Fluorouracil-Toxizität (DPYD) Cowden-Syndrom (PTEN) Diffuses Magenkarzinom (CDH1) Hereditärer Brust- und Eierstockkrebs (HBOC), (BRCA1, BRCA2, CH + 3 more
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Ambulanzzentrum des UKE GmbH Fachbereich Labormedizin

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DAkkS D-ML-19804-01-00 Hamburg, DE
Cyclosporin A Everolimus FK 506 (Tacrolimus) Sirolimus 6-Methylmercaptopurin + 3 more
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Ambulanzzentrum UKSH Genetisches MVZ Lübeck/Kiel Humangenetik

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DAkkS D-ML-13314-03-00 Lübeck, DE
Fra(X)-Syndrom, FXTAS (FMR1) Friedreich Ataxie (FXN) DRPLA (ATN1) Huntington Krankheit (HTT) Huntington-like (TBP, JPH3) + 3 more
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Ambulanzzentrum des UKSH gemeinnützige GmbH Universitäres MVZ Kiel Pädiatrische Endokrinologie und Diabetologie Kinderendokrinologisches Labor

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DAkkS D-ML-13314-04-00 Kiel, DE
Aldosteron 11-Desoxycorticosteron 11-Desoxycortisol 17-Hydroxypregnenolon 17-Hydroxyprogesteron + 3 more
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Amentum Clean Energy

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UKAS 1011 Warrington, GB
OM H-3 based on ISO 9698:2019 ISO 9696:2017 and ISO (HSG 248) – 2021 (PCM) based on HSG 248 staining based on HSG 248.
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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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