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

Showing 201–225 of 834 labs

DAkkS D-K-21083-01-01 Neunkirchen-Heinitz, DE
Gleichspannung 0 µV Messgeräte > 20 mV Messgeräte > 200 mV > 2 V > 20 V + 3 more
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DAkkS D-K-17344-01-01 Hochdorf-Assenheim, DE
Härte *) 20 HRA Härtevergleichsplatten 20 HRB nach Rockwell Verfahren 20 HRC 40 HRD 60 HRF + 3 more
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DAkkS D-ML-13446-01-01 Wernigerode, DE
automatische Zelldifferenzierung Erythrozyten Leukozyten Retikulozyten Thrombozyten + 3 more
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DAkkS D-K-17222-01-01 Nossen, DE
Kraft (WPM) Werkstoffprüfmaschinen Acoustics — tonality assessment (DIN 456 messeinrichtungen von Härte (WPM) 30 HBW + 3 more
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DAkkS D-K-15122-01-00 Cunewalde, DE
Absolutdruck p abs > 41 bar Negativer und positiver Überdruck + 3 more
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DAkkS D-PL-12083-01-04 Bönnigheim, DE
DIN 53160 DIN 54034 DIN 54056 DIN EN 20105-A02 DIN EN 20105-N01 + 3 more
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DAkkS D-K-15198-01-00 Hanau, DE
Taupunkttemperatur thermometer, -80 °C bis Railway braking — urban guided transport > -35 °C bis Temperatur- −35 °C bis + 3 more
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DAkkS D-K-12094-01-02 Darmstadt, DE
–1 bar Positiver und negativer Positiver Überdruck p e > 0,0 bar Absolutdruck p abs 0,25 bar + 3 more
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DAkkS D-K-12029-02-02 Darmstadt, DE
Übertragungsmaß von Messmikrofonen oder Freifeld-Leerlauf- 20 Hz Freifeld -Übertragungsmaß Vorverstärker, nach IEC + 3 more
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Hydrodata

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DAkkS D-PL-18139-01-00 Oberursel, DE
DIN EN ISO 5667-1 (A 4) DIN 38402-A 12 DIN 38402-A 13 DIN 38402-A 15 DIN EN ISO 5667-3 (A 21) + 3 more
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Hydrotechnik

Active
DAkkS D-K-15045-01-01 Limburg a. d. Lahn, DE
Negativer und Positiver Überdruck p e > 0,015 bar Überdruck p (ein- oder mehrgängige + 3 more
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DAkkS D-PL-18818-02-02 Schwerin, DE
DIN EN ISO 10993-1 DIN EN ISO 10993-5 DIN EN ISO 17405 ISO 10993-23 DIN EN ISO 10993-18 + 3 more
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Hygiene Nord

Active
DAkkS D-PL-18411-01-04 Greifswald, DE
DIN EN ISO 10993-5 DIN EN ISO 10993-1 DIN EN ISO 11737-2 DIN EN 1040 DIN EN IEC 60601-2-75 + 3 more
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DAkkS D-K-15192-01-00 Oberrot, DE
Innen- und Tiefenmaße Konventioneller Wägewert/ Massenormale Festkörpervolumen + 3 more
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I17-Wind

Active
DAkkS D-PL-21268-01-00 Husum, DE
ISO 9613-2
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DAkkS D-PL-20737-01-00 Bayreuth, DE
DIN 4150-1 DIN 4150-2 DIN 4150-3 DIN EN 61800-5-1: 2017
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IEL

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DAkkS D-PL-11011-01-02 Aurich, DE
DIN 45691
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DAkkS D-PL-19746-01-04 Deggendorf, DE
DIN EN ISO 17892-2 DIN EN ISO 17892-3 DIN EN ISO 17892-4 DIN 18121-2 DIN 18125-2 + 3 more
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DAkkS D-K-11332-01-02 Leipzig, DE
Kraft 10 kN Sound power — survey method (ISO 3746) Radaufstandskraft- 10 kN Prüfkraftmesseinrichtung Länge 10 mm
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DAkkS D-PL-20186-01-00 Düsseldorf, DE
DIN EN 61800-5-1: 2017
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DAkkS D-ML-13224-01-01 Berlin, DE
HbA1c Vitamin A Vitamin B1 Vitamin B2 Vitamin B6 + 3 more
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DAkkS D-ML-20687-01-00 Berlin, DE
Thrombozytenaggregometrie Drogen- und Medikamentenscreening Freie Fettsäuren Linolensäure, Eicosapentaensäure + 3 more
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DAkkS D-PL-13119-02-01 Dresden, DE
ASTM F1978 ASTM G195 DIN EN ISO 4287 DIN EN ISO 4288 DIN EN ISO 5470-1 + 3 more
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DAkkS D-K-13119-01-01 Dresden, DE
Temperaturanzeigegeräte –100 °C - Thermopaare, Thermoelemente Typ J, K und N für Widerstands- –100 °C - Direktanzeigende Thermometer + 3 more
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DAkkS D-ML-13142-01-01 Berlin, DE
Fettsäureprofil der Erythrozytenmembran Kurzkettige Fettsäuren MMA (Methylmethacrylat) Gesamtporphyrine + 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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