ISO 3744

Sound power — enveloping surface engineering method

ISO 3744 specifies the engineering method for determining sound power and sound energy levels using sound pressure measurements obtained on an imaginary surface (hemispherical or parallelepiped) surrounding a noise source. This method is widely used for in-situ testing of machinery, industrial equipment, and large installations where reverberation room testing is impractical. It provides a practical balance between accuracy and field applicability, making it suitable for machinery compliance testing, environmental noise assessments, and product CE marking requirements across the EU. ISO 17025 accreditation confirms laboratory proficiency in sound field measurement, environmental parameter correction, and uncertainty quantification for this complex measurement method.

What it measures

  • Sound power level (Lw) using enveloping surface pressure data
  • A-weighted and frequency-weighted sound power
  • Octave and one-third-octave band sound power (63 Hz to 8 kHz)
  • Environmental and measurement corrections
  • Sound power directivity and spatial variability
🇩🇪 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 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
1,868 Accredited labs
20 Countries

Showing 1,101–1,125 of 1,868 labs

MVZ Labor Passau

Active
DAkkS D-ML-13360-01-00 Passau, DE
5 OH-Indolessigsäure Adrenalin Amiodaron, Desmethylamiodaron CDT Amiodaron, Desethylamiodaron + 3 more
View Profile

MVZ Labor Prof. Blessing Singen

Active
DAkkS D-ML-19165-01-01 Singen Hohentwiel, DE
Amiodaron, Desmethylamiodaron CDT HbA1c Katecholamine (Adrenalin, Noradrenalin, Mycophenolsäure + 3 more
View Profile

MVZ Labor Ravensburg GbR Standorte: Elisabethenstraße 11, 88212 Ravensburg; Marie-Curie-Straße 6, 88400 Biberach an der Riß

Active
DAkkS D-ML-13347-01-00 Ravensburg, DE
Thrombozytenfunktion Omega-3-Fettsäuren Omega-6-Fettsäuren 5-HIES (5-Hydroxyindolessigsäure) a-Hydroxy-Alprazolam + 3 more
View Profile

MVZ Labor Ravensburg SE & Co. e

Active
DAkkS D-ML-13347-01-01 Ravensburg, DE
Biotin (Vitamin H) Aldosteron Cortisol Quecksilber Testosteron + 3 more
View Profile

MVZ Labor Schweinfurt

Active
DAkkS D-ML-13026-01-00 Schweinfurt, DE
Basophile Granulozyten Eosinophile Granulozyten Erythrozyten Hämatokit Leukozyten + 3 more
View Profile

MVZ Labor im Sommershof

Active
DAkkS D-ML-21592-01-00 Köln, DE
Thrombozytenaggregation Platelets) HbA1c Automatisches Blutbild Leukozyten + 3 more
View Profile

MVZ Labordiagnostik Regensburg

Active
DAkkS D-ML-20420-01-00 Regensburg, DE
Rapid EDTA-Plasma Reagin Lipoid-Antikörper/Treponema Treponema pallidum Enteritiserreger (Salmonella Shigella spp., Yersinia spp.) + 3 more
View Profile

MVZ Labordiagnostik Regensburg GmbH Fachbereich Laboratoriumsmedizin

Active
DAkkS D-ML-20420-02-00 Regensburg, DE
Cyclosporin A 25-Hydroxy Vitamin D Ethylglucuronid, Ethylsulfat Everolimus Freies Metanephrin + 3 more
View Profile

MVZ Martinsried

Active
DAkkS D-ML-21356-01-00 Martinsried, DE
Kleines Blutbild Großes Blutbild Retikulozyten Thrombozyten Lymphome/Monoklonale Gammopathie + 3 more
View Profile

MVZ Medivision Altona

Active
DAkkS D-ML-20723-01-00 Hamburg, DE
Haemoglobin A1c Basophile Eosinophile Erythrozyten MCH, MCHC, MVC + 3 more
View Profile

MVZ Medizinische Laboratorien Düsseldorf

Active
DAkkS D-ML-13049-01-01 Düsseldorf, DE
10-Hydroxycarbazepin (MHD) 5-Hydroxyindolessigsäure Adrenalin Ampicillin Carbamazepin-10,11-epoxid + 3 more
View Profile

MVZ Medizinische Labore Dessau Kassel

Active
DAkkS D-ML-13316-01-01 Dessau-Roßlau, DE
Oxcarbazepin, 10-OH-Carbamazepin Nikotin Galactose Vilazodon Temazepam + 3 more
View Profile

MVZ Medizinische Labore Limbach München Rosenheim GmbH Standorte: Richard-Strauß-Straße 80+82, 81679 München; Brückenstraße 1, 83022 Rosenheim

Active
DAkkS D-ML-22830-01-00 München, DE
Hämoglobin HbA1c (Glykohämoglobin) Basophile Eosinophile Erythrozyten + 3 more
View Profile

MVZ Medizinisches Labor Bremen

Active
DAkkS D-ML-13439-01-01 Bremen, DE
Hämoglobin 1,4-Methylimidazolessigsäure Imidazolessigsäure 10-Hydroxy-Oxcarbazepin (Metaboliten 11 dehydro-Thromboxan B2 + 3 more
View Profile

MVZ Medizinisches Labor Nord MLN

Active
DAkkS D-ML-13171-01-00 Hamburg, DE
Thrombozytenaggregation werkzeuge Typ II Thrombozytensekretion Alprazolam inklusive Metabolit a-Hydroxy-Alprazolam + 3 more
View Profile

MVZ Medizinisches Labor Oldenburg

Active
DAkkS D-ML-13215-01-01 Oldenburg, DE
Erythrozyten Thrombozyten Differentialblutbild Hämatokrit MCV + 3 more
View Profile

MVZ Medlabwahl GmbH Medizinisches Labor Wahl

Active
DAkkS D-ML-13354-01-00 Lüdenscheid, DE
Großes Blutbild Kleines Blutbild Liquordiagnostik Retikulozyten Natriumchlorid + 3 more
View Profile

MVZ Rheumatologie und Autoimmunmedizin Hamburg GmbH Speziallabor am Mönckeberg

Active
DAkkS D-ML-19073-01-00 Hamburg, DE
Erythrocyten Leukocyten MCV Hämoglobin Hämatokrit + 3 more
View Profile

MVZ UKGM GmbH MVZ Lahnberge Bereich Humangenetik

Active
DAkkS D-ML-23124-01-01 Marburg, DE
Syndrom, Gene: AKT1, PIK3CA, PTEN, SEC23B Carney-Komplex, Gene: PRKAR1A, OMIM*600993, STK11 Cowden-Syndrom, Gene: AKT1, + 3 more
View Profile

MVZ der Universitätsmedizin Mainz GmbH Fachgebiet Humangenetik, molekulargenetisches Labor

Active
DAkkS D-ML-21458-02-01 Mainz, DE
angeborener Chromosomensatz Silver-Russell-Syndrom: H19, KCNQ1OT1 MEST Deletion; Angelman-Syndrom + 3 more
View Profile

MVZ der Universitätsmedizin Mainz GmbH Humangenetische Praxis Am Fort Mariaborn

Active
DAkkS D-ML-21458-01-01 Mainz, DE
angeborener Chromosomensatz Molekularzytogenetische Analyse CDKN2C(1p32.3 )/CKS1B ( 1q21-22) Amplifikation, Deletion, Rearrangement, TCF3(11q23)/PBX(11q23)(19p13.3) + 3 more
View Profile

MVZ für Laboratoriumsmedizin und Mikrobiologie Koblenz-Mittelrhein

Active
DAkkS D-ML-13351-01-00 Koblenz, DE
Faktor XIII Antigen Adrenalin/Noradrenalin/ Dopamin Amiodaron/ Amiodaron, Desethylamiodaron + 3 more
View Profile

MVZ für Laboratoriumsmedizin und Mikrobiologie Würzburg

Active
DAkkS D-ML-22817-01-01 Würzburg, DE
3-Methoxytyramin Amisulprid Amitriptylin, Nortriptylin Aripiprazol, Dehydroaripiprazol Bupropion, 10-OH-Bupropion + 3 more
View Profile

MVZ genetikum

Active
DAkkS D-ML-22061-01-01 Neu-Ulm, DE
*) 1 bar; 2 bar Spinobulbäre Muskelatrophie (Typ Kennedy) AZFa-c Azoospermiefaktor + 3 more
View Profile

MZLA Versorgungszentrum

Active
DAkkS D-ML-18244-01-01 Altenburg, DE
Thrombozytenfunktion Thrombozytenfunktionstest Automatisches Blutbild automatische Leukozytendifferenzierung + 3 more
View Profile

No matching labs found.

Industries

Industrial machinery manufacturers Construction equipment producers HVAC and ventilation systems Power generation and compressor suppliers Large transport and handling equipment makers

Related Standards

  • ISO 3740 Acoustics — Determination of sound power levels of noise sources — General guidelines
  • ISO 3743-1 Acoustics — Determination of sound power levels of noise sources — Part 1: Reverberation room method
  • ISO 3745 Acoustics — Determination of sound power levels of noise sources — Precision method using an enveloping surface

Other Test Methods

0 labs selected
Compare