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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Microtech Services (Wessex)

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Mimete Srl Unipersonale

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ACCREDIA 01676 Biassono, IT
ASTM B212-21 ASTM E1019-24 ASTM B527-24 BS EN ISO 3923-1 ASTM B417-22 + 3 more
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Minebea Intec Bovenden

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DAkkS D-K-20451-01-00 Bovenden, DE
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Ministerium für Soziales, Gesundheit und Integration Baden-Württemberg Landesgesundheitsamt Baden-Württemberg

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Ministero della Difesa - Comando per le Operazioni in rete - Secure COR Lab

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ACCREDIA 02288 Roma, IT
ETSI EN 319 412 ETSI EN 319 401 ETSI EN 319 411-2 ETSI EN 319 411-1
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Mitie Environmental Services

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UKAS 0317 Derby, GB
(HSG 264, 2012) Appendix 5 of HSG 227 (2004))
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Mitutoyo Deutschland

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DAkkS D-K-15096-01-00 Neuss, DE
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Moeller Operating Engineering

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Mühlenkreiskliniken AöR Institut für Laboratoriumsmedizin, Transfusionsmedizin und Mikrobiologie

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DAkkS D-ML-20225-01-00 Minden, DE
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Müller-BBM Building Solutions GmbH Akustisches Prüflaboratorium

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DAkkS D-PL-22339-02-01 Planegg, DE
DIN EN ISO 717-1 DIN EN ISO 717-2 DIN EN ISO 10140-2 DIN EN ISO 10140-4 DIN EN ISO 10140-5 + 3 more
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Müller-BBM Industry Solutions GmbH Kalibrierlaboratorium für Beschleunigung und akustische Messgrößen

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DAkkS D-K-14119-01-00 Planegg, DE
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Müller-BBM Industry Solutions GmbH Prüflaboratorium für Schall und Schwingungen, Elektromagnetische Felder und Licht, Immissionsschutz und Gefahrstoffe

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DAkkS D-PL-14119-01-01 Planegg, DE
DIN 4150-1 DIN 4150-2 DIN 4150-3 DIN ISO 8297 DIN EN ISO 12354-4 + 3 more
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München Klinik gGmbH Medizet - Institut für Laboratoriumsmedizin und medizinische Mikrobiologie

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N.V. Nederlandse Gasunie

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NEN 3650 NEN 1059 NEN 3656 NEN 3651 ISO 13480 + 2 more
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NATEC Sensors

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NEOTES Ambiente e Qualità

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ACCREDIA 00846 Olevano sul Tusciano, IT
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NIPPON SANSO ESPAÑA, S.L. (Unipersonal)

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ENAC LC10.077 Madrid, ES
2 · 10–6 mol/mol  C  100 · 10–6 mol/mo 0,1 · 10–2 mol/mol < C  2,5 · 10–2 mol/ 1 · 10–6 mol/mol  C  100 · 10–6 mol/mo 5 · 10–6 mol/mol  C  20 · 10–6 mol/mol 0,15 · 10–2 mol/mol  C  20 · 10–2 mol/ + 3 more
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NMi TESTLAB

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DAkkS D-PL-17186-01-01 Blomberg, DE
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NORMEC ABIOLAB

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COFRAC 1-7442 Montbonnot Saint Martin, FR
NF T 90-412 DIN EN ISO 7899-1 DIN EN ISO 10304-1 DIN EN ISO 6888-2 NF V08-054 + 3 more
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NORMEC QS

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RvA I248 Ede, NL
NEN-EN 13361 ISO 13362 NEN-EN 13491 DIN EN 13493 NEN-EN 13492 + 3 more
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NSF Wales Limited

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UKAS 0626 Newport, GB
BS EN ISO 7686:2005 DIN EN 997 DIN EN 13079 DIN ISO 10381-7 DIN EN 14622 + 3 more
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Narda Safety Test Solutions

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DAkkS D-K-17726-01-00 Pfullingen, DE
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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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