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-21980-02-01 Hennigsdorf, DE
Kraft 50 N Sound power — survey method (ISO 3746) > 200 N Railway brake — automatic variable load 0,2 kN + 1 more
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MESA Meß- und Regeltechnik Vertriebs- und Service

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DAkkS D-K-20515-01-00 Filderstadt, DE
Temperaturmessgrößen auch direktanzeigend 35 °C direktanzeigende > 200 °C auch direktanzeigend Temperaturmessgrößen −35 °C + 3 more
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MK-Kalibrierlabor

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DAkkS D-K-18366-01-01 Schweinfurt, DE
1350 mm Innen- und Tiefenmaße * > 300 mm Tiefenmessschieber * 0 mm Höhenmessschieber * 0 mm + 3 more
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MLL MVZ

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DAkkS D-ML-13228-01-00 München, DE
Berliner-Blau-Reaktion Naphthylacetat-Esterase Pappenheim-Färbung Peroxidase-Reaktion Schnellfärbung (Diff-Quick) + 3 more
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CRP Cystatin C HbA1c Großes Blutbild Kleines Blutbild + 3 more
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MPA Eberswalde Materialprüfanstalt Brandenburg GmbH Prüflabor

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DAkkS D-PL-11241-01-01 Eberswalde, DE
DIN EN 50178: 1998 DIN EN ISO 2813 DIN EN ISO 4628-4 DIN EN ISO 10456 DIN EN ISO 12572 + 3 more
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MPA Kalibrierdienst

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DAkkS D-K-17552-01-01 Berlin, DE
Drehmoment * 0,2 N∙m > 10 N∙m bis Kalibriereinrichtungen > 100 N∙m Drehmomentschlüssel, 0,2 N∙m + 3 more
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MR COMP

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DAkkS D-PL-13383-01-00 Gelsenkirchen, DE
IEC 62570 DIN 13273-7
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MS2 ENGINEERING und ANLAGENBAU

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DAkkS D-K-20595-01-00 Kirchheim unter Teck, DE
Tensile testing of metallic materials (I Vickers hardness test (ISO 6507) Taupunkttemperatur direktanzeigende > 200 °C Widerstandssensor > 300 °C + 3 more
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MTS Systems (Germany)

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DAkkS D-K-21976-01-01 Berlin, DE
Kraft (WPM) Vibration measuring instruments — test m nen nach DIN 51220 Länge (WPM) *) Vibration and shock — experimental modal + 3 more
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MVZ (Medizinisches Versorgungszentrum) am Klinikum Passau GmbH Institut für Labor- und Transfusionsmedizin

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Großes Blutbild Kleines Blutbild Erythrozyten Hämoglobin Hämatokrit + 3 more
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MVZ - Medizinisches Versorgungszentrum Mülheim GmbH Nebenbetriebsstätte

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DAkkS D-ML-20741-01-00 Oberhausen, DE
Blutzellen Basophile Granulozyten Basophile Granulozyten, Eosinophile Gran Eosinophile Granulozyten, Erythrozyten, Basophile Leukozyten, absolut + 3 more
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MVZ Clotten Labor Haas, Raif & Kollegen

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DAkkS D-ML-13348-01-00 Freiburg, DE
Antiepileptika: (Flecainid) Arginin, ADMA, SDMA, Homoarginin Bupropion / Hydroxybupropion Cotinin, Nicotin + 3 more
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MVZ Stein + Kollegen SE & Co. e

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DAkkS D-ML-13179-01-00 Mönchengladbach, DE
Thrombozytenaggregation (Multiplate) Spezifisches Gewicht Aceton Benzol + 3 more
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MVZ Düsseldorf-Centrum

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Vitamin A Vitamin A, Vitamin E Vitamin C Vitamin B2 (FAD) Vitamin B1 + 3 more
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DAkkS D-ML-13151-01-00 Mainz, DE
16-Hydroxyestron 17-Hydroxypregnenolon 17-Hydroxyprogesteron 2-Hydroxyestron 2-Methoxyestron + 3 more
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MVZ Gemeinschaftslabor Cottbus

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DAkkS D-ML-19676-01-00 Cottbus, DE
Homocystein Katecholamine Vitamin A Vitamin B1 Vitamin B6 + 3 more
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MVZ Labor Bochum MLB

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DAkkS D-ML-19670-01-01 Bochum, DE
MN (mononukleare Zellen) Blutbild klein Thrombozyten Hämoglobin Natriumchlorid + 3 more
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MVZ Labor Dortmund Leopoldstraße

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DAkkS D-ML-21851-01-00 Dortmund, DE
Basophile Eosinophile Erythrozyten Hämatokrit Hämoglobin + 3 more
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MVZ Labor Limbach & Kollegen eGbR Standorte: Im Breitspiel 16, 69126 Heidelberg; Im Breitspiel 15, 69126 Heidelberg; Collinistr. 11, 68161 Mannheim

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DAkkS D-ML-13176-01-01 Heidelberg, DE
Hämoglobin 11-Desoxycorticosteron 11-Desoxycortisol 17-Hydroxyprogesteron 17-OH-Pregnenolon + 3 more
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MVZ Labor Quade & Kollegen

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DAkkS D-ML-17419-01-01 Köln, DE
Thrombozytenfunktion Carbamazepin-epoxid Levetiracetam Phenytoin Pregabalin + 3 more
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MVZ Labor Reising-Ackermann und Kollegen

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DAkkS D-ML-13231-01-00 Leipzig, DE
Hämoglobin, frei Thrombozytenaggregation Thrombozytenfunktion (Verschlusszeit) 3-Methoxytyramin + 3 more
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MVZ Labor Essen Nienkampstraße

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DAkkS D-ML-22051-01-00 Essen, DE
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MVZ Labor Greifswald

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DAkkS D-ML-18055-01-00 Greifswald, DE
HbA1c Retikulozyten Leukozytendifferenzierung, Leukozyten Blutbild (Hämatokrit, Erythrozyten, Thro Natrium + 3 more
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MVZ Labor Krone

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DAkkS D-ML-13256-01-01 Bad Salzuflen, DE
4-Hydroxy-Tamoxifen 4-Methyl-Aminoantipyrin 6-MAM 7-amino-Clonazepam 7-amino-Flunitrazepam + 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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