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-ML-18202-01-00 Rüsselsheim, DE
Erythrozytenzahl Hämatokrit Leucozytendifferenzierung Leucozytenzahl MCV + 3 more
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Charpy impact test (ISO 148-1) Salt spray / neutral salt fog test (ISO Radiated emissions (CISPR 32) Innen- und Tiefenmaße Wägewert/ + 3 more
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DAkkS D-K-21136-01-00 Damme, DE
Innen- und Tiefenmaße Konventioneller Charpy impact test (ISO 148-1) Salt spray / neutral salt fog test (ISO Radiated emissions (CISPR 32) + 1 more
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DAkkS D-PL-18931-01-01 Hannover, DE
DIN 45645-2
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DAkkS D-K-15106-01-02 Bickenbach, DE
Vickers hardness test (ISO 6507) Kraft Kraftaufnehmer und Sound power — survey method (ISO 3746) 0,2 MN + 3 more
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Abgasmessgeräte für motoren Transmissionsfilter Trübungsgrad N Transmission T + 3 more
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DAkkS D-PL-18598-01-02 Essen, DE
DIN 30655-1 DIN 30655-2 DIN 3590-1 DIN 3590-2 DIN 30652-2 + 3 more
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DAkkS D-ML-17457-01-00 Minden, DE
Anti-Müller-Hormon Androstendion CA 125 Cortisol DHEA-S + 3 more
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Azoospermie (AZF-Mikrodeletionen) Fragiles X-Syndrom (FMR1) Chorea Huntington (HTT) Spinocerebelläre Ataxie Typ1 (ATXN1); Typ 2 (ATXN2); Typ 3 + 3 more
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HLA Klasse I Antikörper lymphozytäre Antikörper donorspezifische komplementabhängige
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DAkkS D-ML-18276-01-01 Duisburg, DE
Thrombozytenaggregation Epinephrin-Ristocetin) nach Verschlusszeitbestimmung Kollagen / ADP, PFA-Kollagen Epinephrin, PFA-P2Y) + 3 more
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DAkkS D-PL-11021-01-01 Leipzig, DE
ISO 1920-4 DIN EN 480-11 DIN EN 12350-1 DIN EN 12350-3 DIN EN 12350-6 + 3 more
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DAkkS D-ML-14571-01-00 Brandenburg an der Havel, DE
Aktivator ADP / Epinephrin Thrombozytenfunktionstest Basophile Leukozyten, absolut Basophile Leukozyten Eosinophile Leukozyten + 3 more
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DAkkS D-PL-18520-01-01 Arnstorf, DE
ISO 354 BS EN ISO 717-2:2020 ISO 7171 UNE-EN ISO 3382-2 BS EN ISO 10140-3:2021 + 3 more
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DAkkS D-K-15047-01-00 Türkenfeld, DE
spektrale Mikrofonempfindlichkeit Photodioden 1 µA/W Bestrahlungsstärke + 3 more
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Grohe

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DAkkS D-PL-21413-01-01 Hemer, DE
DIN EN 22248 DIN ISO 1817 IEC 60512-11-11 IEC 60512-11-12 DIN EN ISO 3822-1 + 3 more
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DAkkS D-PL-17291-01-00 Buchen Odenwald, DE
ASTM D3835-16 ASTM D6204-19a ASTM D6601-19 ISO 11443 ASTM D1238-13 + 3 more
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DAkkS D-PL-19908-01-01 Salzbergen, DE
ISO 3105 ASTM D 7042 ISO 2909 ASTM D 5293 ISO 3104 + 3 more
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DAkkS D-K-17638-01-02 Remscheid, DE
Tensile testing of metallic materials (I Vickers hardness test (ISO 6507) Drehmoment 2 N·m Handbetätigte 20 N·m + 3 more
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HBT

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DAkkS D-PL-18658-01-01 Lünen, DE
DIN 18041 DIN EN 1804-2 DIN EN 1804-3
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DAkkS D-ML-13015-01-01 Wiesbaden, DE
Verschlusszeit (ADP, Epinephrin, P2Y12) HCG, ß-HCG PF4/Heparin-Komplexe induzierte Thrombozytopenie, Test) Differenzialblutbild (maschinell) + 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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