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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1A CAL

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DAkkS D-K-15115-01-00 Kassel, DE
- Gleichspannung Josephson-Josephson Multimeter Quellen > 0,2 V Spannungsnormale + 3 more
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DAkkS D-K-15158-01-00 Haiger, DE
Sound intensity — scanning method (ISO 9 Härteprüfmaschinen Knoop- und 70 HR15N 42 HR30N + 3 more
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3D Service

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DAkkS D-K-18164-01-00 Partenstein, DE
Metrologic, Software von Metrologic Group ≤ 9090 mm CAM 2, Software von Münchingen, D Chur, CH, ≤ 5000 mm + 3 more
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DAkkS D-K-21981-01-00 Konstanz, DE
8tree Scanner / 0 mm bis 100 mm Laterale Größe von Tiefenmaß/ -unterstand (Härteskalen HV0,01
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DAkkS D-K-21221-01-00 Altenbuch, DE
Vickers hardness test (ISO 6507) Koordinatenmessgeräte Koordinatenmessger Steuerungssoftware Messvolumen mit einer Metromec CM, Software Raumdiagonale von von Metromec Software ≤ 750 mm + 3 more
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DAkkS D-K-17303-01-01 Dresden, DE
Kraft 0,5 N Zug- und Druckkraft Vibration measuring instruments — requir Sound power — in-situ using reference so 20 kN + 3 more
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DAkkS D-K-12115-01-00 Minden, DE
Absolutdruck p abs positiver Überdruck Positiver Überdruck p e Überdruck p + 3 more
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DAkkS D-PL-14560-01-00 Teltow, DE
DIN ISO 8297 DIN 45645-1 DIN 45645-2 DIN 45680 Beiblatt 1 ISO 11338-2 + 2 more
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DAkkS D-PL-22637-01-02 Kiel, DE
DIN ISO 10381-2 DIN ISO 10381-4 DIN ISO 10381-5 DIN ISO 18400-104 DIN ISO 18400-203 + 3 more
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AIP

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DAkkS D-K-21076-01-01 Haldenwang, DE
Railway brake — anti-slide device (UIC 5 Railway brake — magnetic track brakes (U Railway brakes — conditions for homologa Messgeräte im Kraftfahrwesen − Abgasmessgeräte für Fremdzündungsmotor + 3 more
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DAkkS D-K-18095-01-00 Karlsfeld, DE
/ Messgeräte 0,001 V > 0,22 V > 2,2 V > 11 V + 3 more
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DAkkS D-PL-14191-01-01 Frankfurt (Oder), DE
DIN 38402-A 11 DIN 38402-A 12 DIN 38402-A 13 DIN ISO 5667-5 (A 14) DIN EN ISO 5667-6 (A 15) + 3 more
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DAkkS D-PL-11133-01-01 Bochum, DE
IEC 61000-4-2: 2008 VDE 0847-4-2 IEC 61000-4-3: 2006 VDE 0847 IEC 61000-4-4: 2012 + 3 more
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AL-PRO

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DAkkS D-PL-11316-01-00 Großheide, DE
IEC 61400-12-1 * IEC 61400-12-5 * IEC 61400-50 * IEC 61400-50-1 * IEC 61400-50-2 * + 1 more
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DAkkS D-PL-18883-01-00 Berlin, DE
DIN ISO 16000-3 DIN ISO 16000-6 DIN EN ISO 16017-1 DIN ISO 12884 EN 16516 + 3 more
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ALS Germany

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DAkkS D-PL-14162-01-03 Altenberge, DE
DIN EN ISO 15587-1 DIN EN ISO 15587-2 DIN EN ISO 14403-2 DIN 38405-4 DIN 38405-8 + 3 more
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DAkkS D-K-15033-01-00 Berlin, DE
1,5 V/m bis 30 V/m 3 V/m bis 100 V/m 1 GHz bis 8 > 8 GHz bis 18 - Gleichspannung + 3 more
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DAkkS D-K-15032-02-00 Weiterstadt, DE
Railway brake — magnetic track brakes (U auch als Vor-Ort-Kalibrierung Rillentiefe Pt auf 0,2 µm Tiefeneinstellnormalen Rauheit auf Raunormalen + 3 more
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AQRAT

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DAkkS D-K-15060-01-00 Dettingen unter Teck, DE
Messschieber für 0 mm Außen-, Innen- und > 500 mm > 1000 mm Tiefenmessschieber * 0 mm Sondermessschieber 0 mm + 3 more
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DAkkS D-K-19792-01-01 Alsdorf, DE
Gleichstromleistung / Messgeräte Wirkleistung Leistungsfaktor - Gleichspannung + 3 more
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AVL DiTEST

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DAkkS D-K-20974-01-00 Cadolzburg, DE
Abgasmessgeräte für − Abgasmessgeräte für Fremdzündungsmotor Kohlenstoffmonoxid Kohlenstoffmonoxid CO Kohlenstoffdioxid CO2 + 3 more
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DAkkS D-K-19342-01-02 Holzkirchen, DE
Taupunkttemperatur Railway braking — urban guided transport Temperaturtransmitter Widerstandssensor *) –30 °C + 3 more
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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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DAkkS D-PL-11244-01-01 Berlin, DE
EN 14033-3 ISO 9611 ISO 11201
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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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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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