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
20 Countries

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DAkkS D-K-17723-01-00 Wiesthal, DE
Koordinatenmessgeräte von <7000 mm under-Edge, UK INCA3D, Software von Inspect 3D, Cholet, F + 3 more
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DAkkS D-K-15105-01-00 Klingenberg, DE
Positiver und −1 bar bis −0,03 bar Positiver und negativer (ein- oder mehrgängige > −0,03 bar bis > 0,15 bar bis + 3 more
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DAkkS D-K-17410-01-01 Korbußen, DE
− Parallelendmaße − Längenmessmittel − Durchmesser − Formabweichung − Gewinde + 3 more
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DAkkS D-PL-11098-01-01 Admannshagen-Bargeshagen, DE
IEC 61400-12 IEC 61400-12-1 IEC 61400-12-2 IEC 61400-12-3 IEC 61400-12-5 + 3 more
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DAkkS D-PL-11233-01-01 Grevenbroich, DE
IEC 61400-12-1 IEC 61400-12-2 IEC 61400-12-3 IEC 61400-12-5 IEC 61400-12-6 + 3 more
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DAkkS D-K-20130-01-00 Meissen, DE
Charpy impact test (ISO 148-1) Salt spray / neutral salt fog test (ISO elektronische Waagen verwendete Abkürzungen: 1) In den CMC sind die erweiterten Messu + 2 more
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Waagen-Jöhnk

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DAkkS D-K-19520-01-00 Dätgen, DE
Charpy impact test (ISO 148-1) Salt spray / neutral salt fog test (ISO Radiated emissions (CISPR 32) verwendete Abkürzungen:
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DAkkS D-K-19038-01-00 Rimbach, DE
Charpy impact test (ISO 148-1) Salt spray / neutral salt fog test (ISO Radiated emissions (CISPR 32) verwendete Abkürzungen:
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DAkkS D-K-17685-01-00 Hardegsen, DE
Charpy impact test (ISO 148-1) Salt spray / neutral salt fog test (ISO elektronische Waagen verwendete Abkürzungen:
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DAkkS D-PL-21231-01-00 Marienheide, DE
DIN EN ISO 5667-1 (A 4) * DIN 38402-A 12 * DIN 38402-A 13 * DIN EN ISO 5667-3 (A 21) * DIN 38402-A 30 * + 3 more
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DAkkS D-PL-14015-01-02 Erding, DE
DIN EN 2561 DIN EN ISO 14126 DIN EN ISO 14125 DIN EN 2563 DIN 53504 + 3 more
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DAkkS D-PL-17463-01-00 Ahaus, DE
DIN 45645-2 DIN EN ISO 11690-1 DIN EN ISO 11690-2
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DAkkS D-K-15006-01-00 Gießen, DE
Steuerungssoftware Messvolumen mit einer Werth Messtechnik ≤ 2330 mm GmbH, Gießen, D Werth Messtechnik ≤ 600 mm Werth Messtechnik ≤ 150 mm
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DAkkS D-PL-21876-01-01 Dortmund, DE
DIN IEC 60060-1 VDE 0432- 1 IEC 60270 VDE 0434 DIN EN 61243-1 + 3 more
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DAkkS D-K-14054-01-00 Hörstel, DE
Kohlenstoffmonoxid *) Kohlenstoffdioxid Propan *) Stickstoffmonoxid Distickstoffmonoxid + 3 more
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DAkkS D-K-20386-01-00 Meppen, DE
Parallelendmaße aus 0,5 mm DIN EN ISO 3650:1999 Einstelldorne Durchmesser 3 mm Durchmesser 5 mm + 3 more
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DAkkS D-K-15040-01-00 Wuppertal, DE
Charpy impact test (ISO 148-1) nichtselbsttätigen elektronischen Ersatzlastverfahren (Staffelverfahren) + 1 more
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DAkkS D-K-21902-01-00 Wilsdruff ST Kesselsdorf, DE
Charpy impact test (ISO 148-1) Salt spray / neutral salt fog test (ISO Radiated emissions (CISPR 32) 1) In den CMC sind die erweiterten Messu
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DAkkS D-PL-19254-01-00 Höchberg, DE
DIN 4150-1 DIN 4150-2 DIN 4150-3 DIN 45641 DIN 45645-1 + 3 more
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DAkkS D-PL-11122-01-00 Kloster Lehnin, DE
DIN EN ISO 10140-1 DIN EN ISO 10140-2 DIN EN ISO 10140-4 DIN EN ISO 10140-5 DIN EN ISO 16283-1 + 3 more
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Yncoris

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DAkkS D-PL-14424-02-00 Hürth, DE
DIN 45645-2
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DAkkS D-ML-18420-01-00 Lübeck, DE
HbA1c Basophile Eosinophile Thrombozyten Lymphozyten + 3 more
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DAkkS D-K-15103-01-01 Königswinter, DE
0,05 V - Gleichstromstärke dreiphasig 60 V; 120 V; 240 V > 240 V einphasig 0,002 V + 3 more
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DAkkS D-K-22359-01-00 Oberursel, DE
Wechselstromstärke 5 mA 5 mA, 10 mA, 20 mA 40 mA, 80 mA, 150 mA 240 mA, 300 mA, 480 mA 600 mA, 720 mA, 960 mA + 3 more
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DAkkS D-K-23094-01-01 Eisingen, DE
Außengewinde Nenndurchmesser zylindrische Innengewinde − Längenmessgeräte Längenmessmittel Länge + 3 more
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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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