ISO 3747:2010

Sound Power Level — 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
🇩🇪 DIN EN ISO 3746 🇬🇧 BS EN ISO 3746 🇫🇷 NF EN ISO 3746 🇮🇹 UNI EN ISO 3746 🇪🇸 UNE EN ISO 3746 🇳🇱 NEN EN ISO 3746 🇩🇪 DIN EN ISO 9614-1 🇬🇧 BS EN ISO 9614-1 🇫🇷 NF EN ISO 9614-1 🇮🇹 UNI EN ISO 9614-1 🇪🇸 UNE EN ISO 9614-1 🇳🇱 NEN EN ISO 9614-1
1,670 Accredited labs
18 Countries

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ME-Meßsysteme

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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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MLM MEDICAL LABS

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DAkkS D-ML-13178-01-01 Mönchengladbach, DE
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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DAkkS D-ML-22373-01-00 Passau, DE
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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DAkkS D-ML-22009-01-00 Düsseldorf, DE
Vitamin A Vitamin A, Vitamin E Vitamin C Vitamin B2 (FAD) Vitamin B1 + 3 more
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MVZ GANZIMMUN

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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
5-Hydroxyindolessigsäure, linsäure, Vani Adrenalin Amiodaron, Desmethylamiodaron Clozapin, Norclozapin Dopamin + 3 more
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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

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 — Survey method
  • ISO 9614-1 Determination of sound power levels of noise sources by sound intensity — Part 1: Measurement at discrete points
  • ISO 12639 Acoustics — Reference sound sources for in-situ calibration of sound pressure and sound intensity measurement apparatus

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