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
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Global Safety & Environmental

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UKAS 7751 Sawbridgeworth, GB
(HSG 264, 2012)
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Green Shield Environmental

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UKAS 9528 Stevenage, GB
Appendix 5 of HSG 227 (2004) (HSG 264, 2012)
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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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Gruppo C.

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ACCREDIA 00164 Rimini, IT
UNI 10511-1 EPA 9060 EPA 1668 ASTM D7979-20 EPA 1613 + 3 more
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Gully Howard Technical

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UKAS 2735 Portsmouth, GB
(HSG 248) – 2021 (PCM) based on HSG 248
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Gully Howard Technical

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UKAS 0363 Portsmouth, GB
HSG 227 (2004)) (HSG 264, 2012) HSG 264 (2012) and Appx. 3 of Appendix 5 of HSG 227 (2004))
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Guymark UK

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UKAS 4006 Birmingham, GB
Attenuator linearity AUDIOMETERS:
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Göttfert Werkstoff - Prüfmaschinen

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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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HAZET-WERK Hermann Zerver

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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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HELIOS Horst Schmidt Kliniken Wiesbaden GmbH Institut für Labordiagnostik und Hygiene

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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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HELIOS Klinikum Krefeld GmbH Institut für Hygiene und Labormedizin

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DAkkS D-ML-19492-02-00 Krefeld, DE
HCG, ß-HCG Ampicillin Cefipim Hämoglobin A1c (HbA1c) Linecolid + 3 more
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HELIOS Klinikum Wuppertal GmbH Institut für Medizinische Labordiagnostik

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DAkkS D-ML-13211-01-00 Wuppertal, DE
ADP-Antagonisten TRAP-6-Aktivierung ASS-Inhibition Thrombozyten-Funktionsanalyse β-HCG + 3 more
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HENSOLDT Sensors

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DAkkS D-K-20425-01-00 Ulm, DE
- Gleichspannung Spannungsmessgeräte > 20 V > 200 V Spannungsquellen + 3 more
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HERCAL ACUSTEC, S.L. (HC INGENIEROS)

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ENAC LE2005 Aranda de Duero, ES
UNE-EN ISO 16283-1 UNE-EN ISO 16283-2 UNE-EN ISO 16283-3 UNE-EN ISO 3382-2
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HESCURO KLINIK Bad Brückenau GmbH Laborgemeinschaft Bad Brückenau

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DAkkS D-ML-21826-01-00 Bad Bocklet, DE
Natriumchlorid Glucose Kalium Natrium Albumin + 3 more
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HFB Engineering

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DAkkS D-PL-18661-01-00 Leipzig, DE
DIN EN ISO 10666 DIN 53438-3 rs738409 DIN EN 1382 DIN EN 1383 + 3 more
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HFS Environmental

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UKAS 4026 Meopham, GB
(HSG 248) – 2021 (PCM) based on HSG 248 (HSG 264, 2012)
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HIGHVOLT Prüftechnik Dresden GmbH Kalibrierlaboratorium

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DAkkS D-K-19153-01-01 Dresden, DE
Gleichspannung a) / Messgeräte > 600 kV Messsysteme, Teiler > 5 kV + 3 more
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HIMA Paul Hildebrandt GmbH Abteilung EDS, Team TLab

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DAkkS D-PL-21561-01-01 Brühl, DE
IEC 61000-6-1 IEC 61000-6-2: 2005 VDE 0839-6-1 VDE 0839-6-2 power port EN 61000-4-29 + 3 more
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HLK Stuttgart

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DAkkS D-PL-11026-01-01 Stuttgart, DE
DIN EN 442-2 DIN EN 16430-1 DIN EN 16430-2 DIN EN 16430-3 DIN 4703-3 + 3 more
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HOTTINGER BRÜEL & KJAER IBÉRICA, S.L. (Unipersonal)

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ENAC LC10.220 San Sebastián de los Reyes, ES
ISO 16063-21 UNE-EN 60942 UNE-EN 61260 UNE-EN 61672-3 UNE-EN 60804 + 3 more
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HSI Consulting srl - società unipersonale

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ACCREDIA 01052 Roma, IT
accordance with BS EN ISO 5349-1 ISO 5667-5 UNI 10500 DIN EN ISO 10523 DIN EN 12341 + 3 more
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HSL Compliance

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UKAS 0642 Ross-on-Wye, GB
(HSG 248) – 2021 M003 based on HSG 248 (PCM) based on HSG 248 M002based on HSG 248 HSG 227 (2004)) + 2 more
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HYDAC Systems & Services

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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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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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