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
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DAkkS D-K-15159-01-01 Gutach Schwarzwaldbahn, DE
Parallelendmaße * 0,5 mm DIN EN ISO 3650:1999 Zylindrische Normale 1 mm Innenzylinder * > 100 mm + 3 more
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ENAC LE1517 Onda, ES
UNE-EN ISO 140-5 UNE-EN ISO 16283-3 UNE-EN ISO 16283-2 UNE-EN ISO 140-7 UNE-EN ISO 16283-1 + 1 more
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QUALILAB

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ACCREDIA 00888 Capriano del Colle, IT
EN 12966: 2014 Section 4.5.4 DIN EN 55025: 2018 DIN EN 60068-2-30 (CISPR 25:2002) Section 6 ISO 11452-4: 2020 + 3 more
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QUALIO

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COFRAC 1-7474 Besancon Cedex, FR
EN 13087-2 NF T 90-003 NF T90-015-1 NF T 90-107 DIN EN ISO 10523 + 3 more
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COFRAC 1-7303 Champdeniers, FR
ISO 13320 VDE 414-9-11 NF V08-250 ISO 19343 DIN EN ISO 7899-1 + 3 more
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QUANTUM INNOVATIVE, S.L. (CIMALab)

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ENAC LE2055 Nigrán, ES
UNE-EN 1789
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Qopas

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DAkkS D-K-12048-01-00 Driedorf, DE
Koordinatenmessgeräte geräte mit einem Chorus, Help-PJM von DEA Hexagon Metrology S.p.A., Turin, I Associates EMS Products, ≤ 1500 mm + 3 more
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Quality Consultants (NI)

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UKAS 2705 Dundonald, GB
(HSG 248) – 2021 (PCM) based on HSG 248 QSOP 03 based on HSG 248
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Questmed

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DAkkS D-PL-18753-02-00 Kleinmachnow, DE
ISO 22679 ISO 7207-1 ISO 14243-1 ISO 14243-2 ISO 14243-3 + 3 more
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UKAS 2594 Margam, GB
ÖNORM EN ISO 17637 BS EN ISO 15614-1:2017 ASTM A 370 DIN EN 10080 BS EN ISO 9015-1:2011 + 3 more
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DAkkS D-PL-22158-01-01 Rehau, DE
DIN EN ISO 2808 DIN EN ISO 11885 DIN EN 12697-28 DIN EN ISO 1172 DIN EN ISO 2578 + 3 more
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COFRAC 1-0789 Reminex - Centre De Recherche - Bp 469 Marrakech Medina | - Marrakech | Maroc, MA
NF T 90-003 DIN EN 26777 DIN EN ISO 10523 DIN EN 846-7 DIN EN 25814 + 3 more
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RFI S.p.A.- Gruppo Ferrovie dello Stato Italiane - LABORATORI DI INNOVAZIONE, PROVE E SPERIMENTAZIONI di RFI

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ACCREDIA 00147 Roma, IT
DIN 1048-2 DIN ISO 48-4 DIN EN 13146-7 DIN EN 13180 DIN EN ISO 868 + 3 more
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RINA CONSULTING - Centro Sviluppo Materiali SpA

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ACCREDIA 01411 Roma, IT
DIN EN ISO 6508-1 ASTM E1019-24 ISO 13320 ISO 6892-2 (BS EN ISO 6892-1: 2019) + 3 more
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RIO

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DAkkS D-K-17376-01-00 Siegen, DE
Parallelendmaße * 0,5 mm DIN EN ISO 3650:1999 > 100 mm > 500 mm > 550 mm + 3 more
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RIVACOLD SRL

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ACCREDIA 01454 Vallefoglia, IT
DIN EN 16825 ISO 22041 EN ISO 22043 DIN EN 13771-1 DIN EN 14511-2 + 3 more
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RMA Mess- und Regeltechnik

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DAkkS D-K-20908-01-00 Rheinau, DE
Durchfluss von Gasen Volumendurchfluss 50 m³/h Railway brakes — brake performance (UIC (Hochdruck Erdgas 5 bis 51 bar) + 1 more
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ROTA YOKOGAWA

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DAkkS D-K-17720-01-00 Wehr, DE
Masse m strömender − Durchfluss von Flüssigkeiten Durchfluss von 1) In den CMC sind die erweiterten Messu Massedurchfluss dm / dt + 3 more
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ROVIRA EQUIPOS

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ENAC LC10.178 Madrid, ES
CEM Ed
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RSK Environment

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UKAS 23462 Coventry, GB
Analysts’ Guide (HSG 248) (PCM) based on HSG 248
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Radiomotive

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ACCREDIA 02089 Fino Mornasco, IT
ETSI EN 301 489-6 DIN EN 61326-2-6 IEC 61326-3-1 IEC 61326-3-2 IEC 60669-2-5 + 3 more
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Ramcare

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UKAS 0505 Lancing, GB
DC CURRENT DC VOLTAGE thermometer Pt100 ROTATIONAL SPEED Generate + 3 more
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Ramm Ingenieur

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DAkkS D-PL-20808-01-00 Wuppertal, DE
DIN 45635-1 DIN 45645 Teil 1
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Regierungspräsidium Kassel Hessische Geräteuntersuchungsstelle

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DAkkS D-PL-19353-02-02 Kassel, DE
IEC 60335-1: 2010 VDE 0700-1 DIN EN 60335-2-2 DIN EN 60335-2-3: 2002 DIN EN 60335-2-4 + 3 more
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Renishaw

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UKAS 4312 Wotton-under-Edge, GB
volume (CMM’s)
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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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