ISO 3743-1

Sound power — reverberation field engineering method

ISO 3743-1 specifies the reverberation room method for determining sound power levels of noise sources, suitable for smaller sources or laboratory environments where sound pressure is measured in a reverberant acoustic field. The method is applicable across a wide frequency range and is commonly used for equipment testing, product compliance assessment, and environmental noise impact studies. This engineering-level method balances accuracy with practical testing constraints and is widely required for EU noise directive compliance and product CE marking. Accreditation demonstrates laboratory control of environmental conditions, proper instrumentation calibration, and competence in complex acoustic data analysis.

What it measures

  • Sound power level (Lw) using sound pressure in reverberation room
  • A-weighted and frequency-weighted sound power
  • Octave band sound power levels (31.5 Hz to 8 kHz)
  • Sound power uncertainty and test environment correction
  • Directional sound power characteristics
🇩🇪 DIN EN ISO 3740 🇬🇧 BS EN ISO 3740 🇫🇷 NF EN ISO 3740 🇮🇹 UNI EN ISO 3740 🇪🇸 UNE EN ISO 3740 🇳🇱 NEN EN ISO 3740 🇩🇪 DIN EN ISO 3744 🇬🇧 BS EN ISO 3744 🇫🇷 NF EN ISO 3744 🇮🇹 UNI EN ISO 3744 🇪🇸 UNE EN ISO 3744 🇳🇱 NEN EN ISO 3744
1,868 Accredited labs
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Instrument Repairs and Calibration

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Intek

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DIN EN 60068-2-30 IEC 62080 IEC 61000-6-1 IEC 61000-6-2: 2005 DIN EN 61010-1 + 3 more
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Intertek Caleb Brett GERMANY

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DIN EN ISO 12185 ASTM D 4052 DIN EN ISO 3405 ASTM D 86 DIN EN 13016-1 + 3 more
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Intertek Consumer Goods

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DAkkS D-PL-14184-01-02 Fürth, DE
IEC 62321-2 DIN EN 61340-4-4 DIN EN 12472 DIN EN 16711-1 DIN EN 1264-5 + 3 more
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Intertek Deutschland

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DAkkS D-PL-12085-01-01 Kaufbeuren, DE
IEC 61000-3-2: 2014 IEC 61000-3-3 IEC 61000-3-11: 2017 IEC 61000-3-12: 2011 IEC 61000-4-2: 2008 + 3 more
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Intertek Polychemlab

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RvA L377 Geleen, NL
DIN EN ISO 10675-1 DIN EN ISO 19458 DIN EN ISO 179-1 NEN 6953 DIN EN ISO 10675-2 + 3 more
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Intona

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UKAS 10273 Dundee, GB
and Appx. 3 of HSG 227 (2004)) Executive guides HSG 264 (2012) (HSG 264, 2012)
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Isserstedt Prüfmaschinen

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Istituto Giordano SpA

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ACCREDIA 00019 Bellaria-Igea Marina, IT
EN 14304:2009+A1:2013 EN 14305:2009+A1:2013 DIN EN ISO 12623 DIN EN 1873 DIN EN 14963 + 3 more
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J B-Monitor

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UKAS 2075 Colwyn Bay, GB
(HSG 248) – 2021 No 1 based on HSG 248 – 2021 (PCM) based on HSG 248 – 2021 No 3 based on HSG 248 – 2021 (PCM) based on HSG 248 + 1 more
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J.P. ALCARAZ ELECTRONICA

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ENAC LC10.259 Cartagena, ES
CEM EL-014 CEM EL CEM EL-001 CEM ME
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JCS Technology

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UKAS 2154 Weston-super-Mare, GB
ISO 178 BS 5350:Part C13 BS 2782 Part 10 Method 1005 BS EN ISO 14125 MIL-STD 810G:2008 Method 501.5 + 3 more
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JOMA INGENIERÍA Y MONTAJES

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ENAC LE1644 Paterna, ES
UNE-EN ISO 16283-1 UNE-EN ISO 16283-3 UNE-EN ISO 16283-2
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JTSEC BEYOND IT SECURITY, S.L. (Unipersonal)

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ENAC LE2505 Granada, ES
UNE 320001 ISO/IEC 18045 ISO/IEC 15408 CEM ISO ISO/IEC 24759 + 2 more
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Jackson and Keay

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UKAS 0027 Colwick, GB
BS EN ISO 11623:2015 BS EN ISO 18119:2018+A1:2021 BS EN ISO 10460:2018 BS EN 20745:2020
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Janner Waagen GmbH Zweigniederlassung Weiden

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DAkkS D-K-21494-01-00 Weiden i. d. OPf., DE
Charpy impact test (ISO 148-1) Salt spray / neutral salt fog test (ISO elektronische Waagen Innen- und Tiefenmaße Konventioneller + 2 more
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Javer Labs

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UKAS 31736 Nottingham, GB
MIL-STD-810G, Method 508:7 BS 2011:2.1 Ca:1977 (IEC 60068-2-10:2005+A1:2018, MIL-STD-810H, Method 508:8
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Johann Fischer Aschaffenburg Präzisionswerk

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DAkkS D-K-18423-01-00 Aschaffenburg, DE
Ebenheitsabweichung verkörperungen z.B. platten nach DIN 876:1984 Geradheitsabweichung ebener Flächen, z.B. + 3 more
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Johnson and Allen

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UKAS 4168 Smithfield, GB
DC CURRENT INSPECTION EQUIPMENT AC CURRENT 50 Hz RMS uncertainties may be increased.
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Johs. Boss

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DAkkS D-K-21417-01-00 Albstadt, DE
(ein- und mehrgängige winde mit geradlinigen unsymmetrischem Profil 0,5 mm bis 6 mm) Außengewinde Nenndurchmesser + 3 more
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Jordan Design and Development Bureau

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UKAS 4515 Amman 11190, JO
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Julius-Maximilians-Universität Würzburg Institut für Hygiene und Mikrobiologie

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Julius-Maximilians-Universität Würzburg Institut für Virologie und Immunbiologie

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Jurjanz

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DAkkS D-K-15085-01-01 Schkeuditz, DE
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K B Calibration Services

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UKAS 4630 East Sussex, GB
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Industries

Power tool and equipment manufacturers Laboratory and medical device makers Small machinery producers Consumer electronics manufacturers Heating and ventilation equipment suppliers

Related Standards

  • ISO 3740 Acoustics — Determination of sound power levels of noise sources — General guidelines
  • ISO 3744 Acoustics — Determination of sound power levels of noise sources — Engineering method using an enveloping surface
  • ISO 354 Acoustics — Measurement of sound absorption coefficient in a reverberation room

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