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

Showing 251–275 of 906 labs

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-17729-01-00 Stendal, DE
DIN EN ISO 5667-1 (A 4) DIN 38402-A 11 DIN 38402-A 12 DIN 38402-A 13 DIN ISO 5667-5 (A 14) + 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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DAkkS D-ML-13142-02-01 Potsdam, DE
Hämoglobin A1c (HbA1c) Differenzialblutbild Erythrozyten Erythroblasten (NRBC) Hämatokrit + 3 more
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DAkkS D-ML-13089-01-00 Frankfurt (Oder), DE
HbA1c Eosinophile, Basophile, MCV, MCH) Retikulozyten Urinsediment Elektrolyte (Kalium, Natrium, Chlorid) + 3 more
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DAkkS D-K-15027-01-00 Düsseldorf, DE
Plasma, Serum, Plasma 0,5 mmol/L Plasma, Serum, Plasma 50 mmol/L Plasma, Serum, Plasma Material Urin + 3 more
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DAkkS D-PL-12107-01-00 Berlin, DE
IEC 62271-1: 2017-07 DIN EN 62271-1 VDE 0671-1 IEC 62271-100: 2021 VDE 0671-100 + 3 more
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DAkkS D-PL-14160-01-01 Aschaffenburg, DE
DIN EN 1230-1 EN 1230-2 DIN 10955 DIN ISO 8784-1 DIN 54378 + 3 more
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DAkkS D-PL-20393-01-00 Wiesbaden, DE
DIN 4150-1 DIN 4150-2 DIN 4150-3 DIN EN ISO 3741 DIN EN ISO 3743-2 + 3 more
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DAkkS D-PL-18192-01-00 Oldenburg, DE
DIN 4150-1 DIN 4150-2 DIN 4150-3 DIN SPEC 45653 ISO 18406
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DAkkS D-PL-11283-01-01 Seevetal, DE
ISO 6508-1 Charpy impact test (ISO 148-1) Tensile testing of metallic materials (I BS EN ISO 9015-2 BS EN ISO 9016:2022 + 3 more
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DAkkS D-K-12001-01-01 Ottobrunn, DE
- Gleichstromwiderstand / Messgeräte Quellen >100 Ω > 10 kΩ + 3 more
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DAkkS D-PL-19220-01-00 Wiesbaden, DE
DIN EN ISO 9614-3 DIN EN ISO 11200 DIN EN ISO 11202 DIN EN ISO 11203 DIN EN ISO 11205 + 3 more
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DAkkS D-PL-14332-01-01 Frankfurt am Main, 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-11044-01-01 Dresden, DE
IEC 61400-12-1 IEC 61400-50 IEC 61400-50-1 IEC 61400-50-2 ISO 9613-2
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DAkkS D-PL-20642-01-00 Kronshagen, DE
DIN EN 61400-11 IEC 61400-11 Edition 3.0 IEC 61400-11 Edition 3.1
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DAkkS D-PL-12023-01-01 Darmstadt, DE
DIN 56912 DIN EN 12198-1 DIN EN 12198-2 DIN EN 12198-3 DIN EN 60825-1 + 3 more
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DAkkS D-PL-17201-01-00 Rheinmünster, DE
ISO 17987-6 ISO 17987-7 ISO 16845
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DAkkS D-K-20838-01-02 Bietigheim, DE
Taupunkttemperatur Railway braking — urban guided transport Railway vehicle body structural requirem Railway bogies — wheelsets and bogies st Elektrische + 3 more
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DAkkS D-PL-14095-03-02 Hamburg, DE
DIN 38402-A 12 DIN ISO 5667-5 (A 14) DIN EN ISO 5667-6 (A 15) DIN EN ISO 19458 (K 19) DIN 19643-1 + 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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