ISO 3747:2010

Sound Power Level โ€” 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
๐Ÿ‡ฉ๐Ÿ‡ช DIN EN ISO 3746 ๐Ÿ‡ฌ๐Ÿ‡ง BS EN ISO 3746 ๐Ÿ‡ซ๐Ÿ‡ท NF EN ISO 3746 ๐Ÿ‡ฎ๐Ÿ‡น UNI EN ISO 3746 ๐Ÿ‡ช๐Ÿ‡ธ UNE EN ISO 3746 ๐Ÿ‡ณ๐Ÿ‡ฑ NEN EN ISO 3746 ๐Ÿ‡ฉ๐Ÿ‡ช DIN EN ISO 9614-1 ๐Ÿ‡ฌ๐Ÿ‡ง BS EN ISO 9614-1 ๐Ÿ‡ซ๐Ÿ‡ท NF EN ISO 9614-1 ๐Ÿ‡ฎ๐Ÿ‡น UNI EN ISO 9614-1 ๐Ÿ‡ช๐Ÿ‡ธ UNE EN ISO 9614-1 ๐Ÿ‡ณ๐Ÿ‡ฑ NEN EN ISO 9614-1
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COFRAC 1-2241 Douai Cedex, FR
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COFRAC 1-1830 Nantes, FR
DIN EN ISO 21528-1 NF V08-401 DIN ISO 16649-1 DIN EN ISO 6888-1 DIN EN ISO 21528-2 + 3 more
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COFRAC 1-0965 Marange-Silvange, FR
DIN EN ISO 13395 DIN EN ISO 10304-1 ISO 5815-1 NF T90-015-1 DIN EN ISO 10523 + 3 more
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COFRAC 1-5943 Nantes, FR
NF X 43-269 NF X 43-050 ISO ISO 16000-7
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ACCREDIA 00054 Torino, IT
DIN EN ISO 1135-4 DIN EN 13744 IEC 62623: 2012 DIN EN 13746 Sound Attenuation EN ISO 4869-1:2018 + 3 more
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ENAC LE2439 Elche, ES
ISO 14389 BS EN ISO 14362-1 BS EN ISO 14362-3 UNE-EN ISO 14362-1 UNE-EN ISO 14362-3 + 3 more
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COFRAC 1-7268 Seichamps, FR
DIN ISO 17289 NF T 90-260 NF X 31-615 (Uniquement DIN EN ISO 10523 DIN EN 27888
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DIN EN ISO 1135-4 EN ISO 1135-5 DIN EN ISO 10993-1 DIN EN ISO 8637-1 DIN EN ISO 7199 + 2 more
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UKAS 2398 Hull, GB
(HSG 248) โ€“ 2021 (PCM) based on HSG 248
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ISO 7171 ISO 1407 BS EN ISO 140-4:1998 BS EN ISO 717-2:2020
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ACCREDIA 01202 Capua, IT
EPA 6020 DIN EN 12457-2 DIN EN 15634-1 EPA 3630 DIN EN 15408 + 3 more
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RvA L470 Bleiswijk, NL
ISO 5660-1 DIN EN 1365-1 EN 13381-4 DIN EN 1634-1 EN 1365-2 + 3 more
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UKAS 10169 Jordanstown, GB
EN 1364-3 DIN EN 1366-4 EN 1364-4 BS 476-21 BS 476-22 + 3 more
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Gleichspannung 30 mV / Messgerรคte > 0,33 V > 3,3 V > 33 V + 3 more
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DAkkS D-K-20306-01-00 Weinstadt, DE
Taupunkttemperatur fรผr Widerstands- หƒ 500 ยฐC - Direktanzeigende Thermometer Thermoelemente หƒ 500 ยฐC Widerstands- -50 ยฐC + 3 more
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UKAS 4279 Heaton Mersey, GB
DIN EN 14791 IEC 60519-11 BS ISO 11338-1:2003 DIN EN 13284-1 DIN EN 14385 + 3 more
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UKAS 4225 Deeside, GB
(HSG 248) โ€“ 2021 (PCM) based on HSG 248 based on BS EN 12457 DIN EN 1948-4 dbSNP rs1800562, rs1799945, rs1800730, r
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UKAS 0170 Heaton Mersey, GB
(HSG 264, 2012) HSG 227 (2004)) (HSG 248) โ€“ 2021 (PCM) based on HSG 248
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UKAS 0136 Rotherham, GB
ISO 3651-2 ASTM A262 Methods A, C & E ISO 7438 ASTM G28-2022 Method A ASTM G48 Method A + 3 more
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UKAS 0621 Wednesbury, GB
DIN EN 1303 DIN EN 12209 DIN EN 14846 BS 3621:2007+A2:2012 BS 8621:2007+A2:2012 + 3 more
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DAkkS D-K-15020-04-01 Norderstedt, DE
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DAkkS D-K-15180-01-01 Wiesloch, DE
Elektrische MessgrรถรŸen Gleichstrom- und NiederfrequenzmessgrรถรŸe Railway brake โ€” magnetic track brakes (U โˆ’ Gleichspannung โˆ’ Gleichstromstรคrke + 3 more
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DAkkS D-K-19495-01-01 Mainz-Kastel, DE
Durchfluss von Gasen 0,5 mยณ/h Volumendurchfluss > 4 mยณ/h Railway overhead lines โ€” pantograph head > 10 mยณ/h + 3 more
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RvA L433 Gasselternijveen, NL
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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 โ€” Survey method
  • ISO 9614-1 Determination of sound power levels of noise sources by sound intensity โ€” Part 1: Measurement at discrete points
  • ISO 12639 Acoustics โ€” Reference sound sources for in-situ calibration of sound pressure and sound intensity measurement apparatus

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