ISO 3740

Sound power level determination — general measurement guidelines

ISO 3740 provides overarching principles and guidelines for selecting appropriate methods to determine sound power levels of noise sources across diverse industrial and consumer applications. It establishes the framework for choosing between precision, engineering, and survey methods based on application requirements and environmental conditions. Sound power determination is essential for manufacturers complying with noise emission directives, environmental impact assessments, and product labeling regulations across the EU. ISO 17025 accreditation ensures laboratories apply correct methodologies, maintain calibrated instrumentation, and report results with documented uncertainty traceable to primary standards.

What it measures

  • Sound power level (Lw) in decibels
  • Frequency-weighted sound power (A-weighted)
  • Octave or one-third-octave band sound power
  • Sound energy levels
  • Noise source classification and categorization
🇩🇪 DIN EN ISO 3743-1 🇬🇧 BS EN ISO 3743-1 🇫🇷 NF EN ISO 3743-1 🇮🇹 UNI EN ISO 3743-1 🇪🇸 UNE EN ISO 3743-1 🇳🇱 NEN EN ISO 3743-1 🇩🇪 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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AIRGRUP

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ENAC LC10.235 Rinconada, ES
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COFRAC 1-7447 Venelles, FR
NF X 43-269 ISO NF X 43-257 NF X 43-050 ISO 16000-7
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ACCREDIA 00378 Pereto, IT
DIN EN 1793-5 ASTM E 415 21 DIN EN 14726 DIN EN 1794-1 DIN EN 1794-2 + 3 more
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ENAC LE2073 Burgos, ES
UNE-EN ISO 16283-1 UNE-EN ISO 16283-3 UNE-EN ISO 16283-2
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AKL Messtechnik

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DAkkS D-K-18095-01-00 Karlsfeld, DE
/ Messgeräte 0,001 V > 0,22 V > 2,2 V > 11 V + 3 more
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AKUVIB Engineering and Testing

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DAkkS D-PL-11133-01-01 Bochum, DE
IEC 61000-4-2: 2008 VDE 0847-4-2 IEC 61000-4-3: 2006 VDE 0847 IEC 61000-4-4: 2012 + 3 more
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AL-PRO

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IEC 61400-12-1 * IEC 61400-12-5 * IEC 61400-50 * IEC 61400-50-1 * IEC 61400-50-2 * + 1 more
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ALAB-Analyse Labor in Berlin

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DIN ISO 16000-3 DIN ISO 16000-6 DIN EN ISO 16017-1 DIN ISO 12884 EN 16516 + 3 more
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ALS France

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COFRAC 1-1364 Saint-Quentin-Fallavier, FR
DIN EN 14902 DIN ISO 16000-3 DIN EN ISO 16017-1 DIN EN ISO 16017-2 DIN ISO 16000-4 + 3 more
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ALS France – Site de Paris

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COFRAC 1-5578 Villebon-Sur-Yvette, FR
NF T 90-412 0.95) based on BS ISO 21527-2:2008 DIN EN ISO 6888-2 DIN EN ISO 16649-3 DIN EN ISO 6888-3 + 3 more
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ALS Germany

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DAkkS D-PL-14162-01-03 Altenberge, DE
DIN EN ISO 15587-1 DIN EN ISO 15587-2 DIN EN ISO 14403-2 DIN 38405-4 DIN 38405-8 + 3 more
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ALS Laboratories (UK)

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UKAS 1282 Templeborough, GB
on BS 4401:Part 3:1970(1986) ISO 12966-2 AM/C/108 based on BS EN ISO BS 684 2.14:2001 BS EN 288-Part 9 :1999 + 3 more
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ALSTOM Transport VPF

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COFRAC 1-5603 Petite-Foret, FR
DIN EN ISO 11546-1 prEN 16185-2 EN 15595 (hors essais au
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ALTER TECHNOLOGY TÜV NORD, S.A. (Unipersonal)

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AMETEK CTS Europe GmbH Kalibrierlabor

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DAkkS D-K-15033-01-00 Berlin, DE
1,5 V/m bis 30 V/m 3 V/m bis 100 V/m 1 GHz bis 8 > 8 GHz bis 18 - Gleichspannung + 3 more
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AMIANT'AIR

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COFRAC 1-6507 Vandoeuvre Les Nancy, FR
NF X 43-269 NF X 43-298 DIN EN ISO 11689 NF X 43-257 NF X 43-050 + 1 more
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COFRAC 1-0876 Nanterre, FR
NF X 31-615 DIN EN ISO 7027-2 DIN EN ISO 10523 DIN EN 27888 DIN ISO 17289 + 3 more
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COFRAC 1-7202 Courbevoie, FR
DIN EN 14385 ETSI EN 301 489-1 V2.2.3 2019-11 NF X43-551 IS EN 1948-1:2006 2006 DIN EN 14789 + 3 more
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ENAC LE1878 Madrid, ES
UNE-EN 14584 UNE-EN 13554 UNE-EN 12819 UNE-EN 12817 UNE-EN ISO 15614-1 + 3 more
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APEC Environmental

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UKAS 2136 Hebburn, GB
QOP03 based on HSG 248 QOP01 based on HSG 248 (HSG 248) – 2021 (PCM) based on HSG 248
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UKAS 0347 Hebburn, GB
(HSG 264, 2012)
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APLING ACÚSTICA - INSONORIZACIÓN, S.L. (SOUNDLAB)

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ENAC LE1299 Barcelona, ES
UNE-EN ISO 16283-1 UNE-EN ISO 140-4
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ENAC LC10.017 Leganés, ES
CEM DI-002 EURAMET CG-2 CEM DI-014 CEM DI-006 CEM DI-016 + 3 more
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ENAC LE2307 Puertollano, ES
ISO/IEC 25010 ISO/IEC 25040 ISO/IEC 25012 ISO/IEC 5259-2
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Machinery and equipment manufacturing HVAC and ventilation systems Power generation equipment Construction and demolition equipment Consumer appliance manufacturers

Related Standards

  • ISO 3743-1 Acoustics — Determination of sound power levels of noise sources — Part 1: Reverberation room method
  • ISO 3744 Acoustics — Determination of sound power levels of noise sources — Engineering method using an enveloping surface
  • ISO 3745 Acoustics — Determination of sound power levels of noise sources — Precision method using an enveloping surface

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