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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DAkkS D-K-11068-01-00 Eggenstein-Leopoldshafen, DE
Luftkerma/-leistung Dosis Dosisleistung
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Kern & Sohn

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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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RvA L605 Delft, NL
IEC 18045 IEC 15408-1
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DAkkS D-K-22363-01-01 Wiesbaden, DE
- Gleichspannung / Messgeräte Spannungsquellen - Gleichstromstärke - Gleichstromwiderstand + 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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RvA L447 Rijswijk Zh, NL
EN ISO 11925-2 DIN EN ISO 13162 DIN EN 14509 DIN EN ISO 13163 DIN EN 1604 + 3 more
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ACCREDIA 00001 Cadriano di Granarolo Emilia, IT
DIN EN ISO 18203 ASTM B557-15 UNI 1567 ISO 15874 DIN EN ISO 10140-1 + 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

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UKAS 8896 Rasssau, GB
DIN EN 13079 BS 1212-4:1991 Clause 4, 13, 14 DIN EN 14622 BS 1212-3:1990 Clause 4 DIN EN 14623 + 3 more
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Kiwa

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UKAS 0692 Cheltenham, GB
DIN EN 16510-2-3 DIN EN 16510-2-1 DIN EN 13229 DIN EN 16510-1 DIN EN 13240 + 3 more
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Kiwa

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UKAS 2360 Brentwood, GB
DIN EN 55011: 2018 IEC/CISPR 22 DIN EN 55016-2-1 IEC 61326-2-2: 2012 IEC 61000-6-1 + 3 more
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RvA L015 Rijswijk Zh, NL
ISO 2781 ISO 1133-1 ISO 6259-1:2015 ISO 6259-3 ISO 6259-2:1997 + 3 more
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Kiwa Primara

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DAkkS D-PL-12089-01-01 Kaufbeuren, DE
BS 1363 DIN VDE 0620-2 DIN VDE 0620-2-1 ISO 12100: 2010 DIN EN 50124-1 + 3 more
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Klingelnberg

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DAkkS D-K-21339-01-00 Hückeswagen, DE
Verzahnungsmesstechnik Die nachgewiesene Verzahnung und rotationssymmetrische abgedeckten Prüfkörper mit taktiler + 3 more
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DAkkS D-PL-13430-01-00 Köln, DE
DIN EN ISO 11138-3 DIN EN ISO 11138-4 DIN EN 13959 DIN 1946-4 DIN EN ISO 19458 (K 19) + 3 more
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DAkkS D-ML-13430-01-00 Köln, DE
Thrombozytenaggregation Adrenalin, Kollagen, Ristocetin, Arachid Partielle Thromboplastinzeit Fibrinogenaktivität (derived) Lupusantikoagulantien + 3 more
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DAkkS D-ML-19856-01-00 Ingolstadt, DE
Liste aller Untersuchungsverfahren Webpräsenz des Medizinischen Laboratoriu Thrombozytenaggregation Trizyklische Antidepressiva Neuroleptika (Clozapin, Norclozapin, Ola + 3 more
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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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DAkkS D-ML-13321-01-01 Wolfsburg, DE
Retikulozyten Differentialblutbild Erythrozytenzahl Erythrozyten-Volumen (MCV) Verteilungsbreite) + 3 more
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DAkkS D-ML-13450-02-01 Würzburg, DE
Fazio-skapulo-humerale DSC2, DSG2, DSP, JUP, PKP2, TMEM43 ); SN Myopathie-Panel; SNV Myotone Dystrophie Typ 1 / M. Curschmann-Steinert (DMPK) + 3 more
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DAkkS D-ML-13355-03-00 Stuttgart, DE
Thrombozytenfunktion Antiepileptika: Benzodiazepine, Fentanyl Ethylglucuronid, Ethylsulfat Ciclosporin, Tacrolimus, Everolimus + 3 more
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DAkkS D-ML-13355-04-00 Stuttgart, DE
Zelldifferenzierung HLA Klasse I Antikörper Crossmatch (serologische Verträglichkeitsprobe im HLA-System) Serologische HLA-Klasse-I-Typisierung + 3 more
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DAkkS D-ML-13295-05-00 München, DE
HLA-Antikörpertestung (Detektion) HLA-Klasse I und II HLA-Antikörper (Spezifizierung) HLA-Antikörper Screening HLA-Antikörperdifferenzierung + 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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