SIST EN ISO 3741:2009
(Main)Acoustics - Determination of sound power levels of noise sources using sound pressure - Precision methods for reverberation rooms (ISO 3741:1999, including Cor 1:2001)
Acoustics - Determination of sound power levels of noise sources using sound pressure - Precision methods for reverberation rooms (ISO 3741:1999, including Cor 1:2001)
This International Standard specifies a direct method and a comparison method for determining the sound power level that would be produced by a source operating in an environment at standard meteorological conditions corresponding to a characteristic impedance of rc = 400 N.s/m3 (where r is the density of air and c is the speed of sound). It specifies test room requirements, source location and general rules for operating conditions, instrumentation and techniques for obtaining an estimate of mean-square sound pressure levels from which the sound power levels of the source in octave or one-third-octave bands are calculated with a grade 1 accuracy. The quantities to be measured are time-averaged sound pressure levels in frequency bands. The quantities to be determined are sound power levels, A-weighted and in frequency bands. Other quantities, which are optional, are sound power levels with other frequency weightings calculated from the measurements in frequency bands. This standard does not provide the means to determine directivity and temporal variation of sound from a source. In general, the frequency range of interest includes the one-third-octave bands with midband frequencies from 100 Hz to 10 000 Hz. Guidelines for the application of the specified methods in an extended frequency range in respect to lower frequencies are given in annex C. This International Standard is not applicable to frequency ranges above the 10 000 Hz one-third-octave band. For higher frequencies the use of methods given in ISO 9295 is recommended. The method specified in this International Standard is suitable for steady noise with broad-band, narrow-band and discrete-frequency components as described in ISO 12001. The noise may be emitted from a device, machine, component or sub-assembly. This International Standard is applicable to noise sources with volumes which are preferably not greater than 2 % of the volume of the reverberation room used for the test. For sources with volumes greater than 2 % of the room volume, the standard deviations given by Table 2 could be exceeded.
Akustik - Ermittlung der Schalleistungspegel von Geräuschquellen durch Schalldruckmessungen - Hallraumverfahren der Genauigkeitsklasse 1 (ISO 3741:1999, einschließlich Cor 1:2001)
Acoustique - Détermination des niveaux de puissance acoustique émis par les sources de bruit à partir de la pression acoustique - Méthodes de laboratoire en salles réverbérantes (ISO 3741:1999, Cor 1:2001 inclus)
NEW!IEC 60942:2017 est disponible sous forme de IEC 60942:2017 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L'IEC 60942:2017 spécifie les exigences de performance de trois classes de calibreurs acoustiques: la classe LS (Laboratory Standard, étalon de laboratoire), la classe 1 et la classe 2. Les limites d'acceptation les plus faibles concernent la classe LS et les plus élevées concernent les appareils de classe 2. Les calibreurs acoustiques de classe LS ne sont normalement utilisés qu'en laboratoire; les appareils de classe 1 et de classe 2 sont considérés comme des calibreurs acoustiques utilisés sur le terrain. Un calibreur de classe 1 est prévu pour être utilisé principalement avec un sonomètre de classe 1 et un calibreur de classe 2 est prévu pour être utilisé principalement avec un sonomètre de classe 2, tel qu'il est spécifié dans l'IEC 61672-1. Les limites d'acceptation concernant les calibreurs de classe LS pour démontrer la conformité avec les exigences du présent document sont basées sur l'utilisation d'un microphone étalon de laboratoire spécifié dans l'IEC 61094-1. Les limites d'acceptation concernant les calibreurs acoustiques de classe 1 et 2 pour démontrer la conformité avec les exigences du présent document sont basées sur l'utilisation d'un microphone étalon de travail spécifié dans l'IEC 61094-4. Cette quatrième édition annule et remplace la troisième édition parue en 2003, dont elle constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) suppression des désignations de classe, classe LS/C, classe 1/C et classe 2/C;
b) ajout de deux autres désignations de classes, les classes LS/M et 1/M, spécifiquement destinées aux pistonphones;
c) ajout d'un critère modifié pour évaluer la conformité avec une spécification: désormais, la conformité est démontrée lorsque (a) les écarts mesurés par rapport aux valeurs nominales ne dépassent pas les limites d'acceptation applicables et (b) l'incertitude de mesure ne dépasse pas l'incertitude de mesure maximale admise correspondante;
d) modification de l'essai de fluctuation du niveau à court terme de la stabilité du niveau de pression acoustique;
e) modification de certaines conditions applicables aux essais d'environnement pour éviter la formation de givre;
f) ajout d'une variante d'essai pour l'immunité aux champs aux fréquences radioélectriques, faisant appel aux guides d'ondes électromagnétiques transverses (TEM).
Akustika - Ugotavljanje ravni zvočnih moči virov hrupa z zvočnim tlakom - Precizijska metoda za odmevnice (ISO 3741:1999, vkjlučno s popravkom Cor 1:2001)
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Akustik - Ermittlung der Schalleistungspegel von Geräuschquellen durch Schalldruckmessungen - Hallraumverfahren der Genauigkeitsklasse 1 (ISO 3741:1999, einschließlich Cor 1:2001)Acoustique - Détermination des niveaux de puissance acoustique émis par les sources de bruit à partir de la pression acoustique - Méthodes de laboratoire en salles réverbérantes (ISO 3741:1999, Cor 1:2001 inclus)Acoustics - Determination of sound power levels of noise sources using sound pressure - Precision methods for reverberation rooms (ISO 3741:1999, including Cor 1:2001)17.140.01Acoustic measurements and noise abatement in generalICS:Ta slovenski standard je istoveten z:EN ISO 3741:2009SIST EN ISO 3741:2009en01-november-2009SIST EN ISO 3741:2009SLOVENSKI
STANDARDSIST EN ISO 3741:2001/AC:2002SIST EN ISO 3741:20011DGRPHãþD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN ISO 3741July 2009ICS 17.140.01Supersedes EN ISO 3741:1999
English VersionAcoustics - Determination of sound power levels of noisesources using sound pressure - Precision methods forreverberation rooms (ISO 3741:1999, including Cor 1:2001)Acoustique - Détermination des niveaux de puissanceacoustique émis par les sources de bruit à partir de lapression acoustique - Méthodes de laboratoire en sallesréverbérantes (ISO 3741:1999, Cor 1:2001 inclus)Akustik - Ermittlung der Schalleistungspegel vonGeräuschquellen durch Schalldruckmessungen -Hallraumverfahren der Genauigkeitsklasse 1 (ISO3741:1999, einschließlich Cor 1:2001)This European Standard was approved by CEN on 13 July 2009.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre:
Avenue Marnix 17,
B-1000 Brussels© 2009 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 3741:2009: ESIST EN ISO 3741:2009
Relationship between this European Standard and the Essential Requirements of EU Directive 98/37/EC .4Annex ZB (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 2006/42/EC .5 SIST EN ISO 3741:2009
Relationship between this European Standard and the Essential Requirements of EU Directive 98/37/EC This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association to provide a means of conforming to Essential Requirements of the New Approach Directive 98/37/EC, amended by 98/79/EC on machinery. Once this standard is cited in the Official Journal of the European Communities under that Directive and has been implemented as a national standard in at least one Member State, compliance with the normative clauses of this standard confers, within the limits of the scope of this standard, a presumption of conformity with the relevant Essential Requirements of that Directive and associated EFTA regulations. WARNING - Other requirements and other EU Directives may be applicable to the product(s) falling within the scope of this standard. SIST EN ISO 3741:2009
Relationship between this European Standard and the Essential Requirements of EU Directive 2006/42/EC This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association to provide a means of conforming to Essential Requirements of the New Approach Directive 2006/42/EC on machinery. Once this standard is cited in the Official Journal of the European Communities under that Directive and has been implemented as a national standard in at least one Member State, compliance with the normative clauses of this standard confers, within the limits of the scope of this standard, a presumption of conformity with the relevant Essential Requirements of that Directive and associated EFTA regulations. WARNING — Other requirements and other EU Directives may be applicable to the product(s) falling within the scope of this standard.
AReference numberISO 3741:1999(E)INTERNATIONALSTANDARDISO3741Third edition1999-08-01Acoustics — Determination of sound powerlevels of noise sources using soundpressure — Precision methods forreverberation roomsAcoustique — Détermination des niveaux de puissance acoustique émispar les sources de bruit à partir de la pression acoustique — Méthodes delaboratoire en salles réverbérantesSIST EN ISO 3741:2009
ISO 3741:1999(E)© ISO©
ISO 1999All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronicor mechanical, including photocopying and microfilm, without permission in writing from the publisher.International Organization for StandardizationCase postale 56 · CH-1211 Genève 20 · SwitzerlandInternetiso@iso.chPrinted in SwitzerlandiiContents1 Scope.12 Normative references.13 Terms and definitions.24 Measurement uncertainty.45 Acoustic environment.65.1 General.65.2 Volume and shape of test room.65.3 Requirements for absorption of test room.65.4 Requirements for background noise level.65.5 Requirements for temperature, humidity and pressure.76 Instrumentation.76.1 General.76.2 Calibration.77 Installation and operation of source under test.87.1 General.87.2 Source location.87.3 Source mounting.87.4 Auxiliary equipment.97.5 Operation of source during test.98 Sound pressure measurements and sound power determination.98.1 Initial measurements.98.2 Additional measurements.148.3 Determination of average sound pressure level in the test room.14SIST EN ISO 3741:2009
© ISOISO 3741:1999(E)iii8.4 Determination of the sound power level of the sound source.148.5 Determination of A-weighted sound power level of the source.169 Information to be recorded.169.1 Noise sources under test.169.2 Acoustical environment.179.3 Instrumentation.179.4 Acoustical data.1710 Information to be reported.17Annex A (normative)
Room qualification procedure for the measurement ofdiscrete-frequency components.18Annex B (informative)
Guidelines for the design of rotating diffusing vanes.23Annex C (informative)
Extension for frequencies below 100 Hz.24Annex D (informative)
Guidelines for the design of reverberation rooms.25Annex E (normative)
Test room qualification procedure for the measurement of broad-band sound.27Annex F (normative)
Procedure for calculating octave band sound power levels and an A-weightedsound power level from one-third-octave band sound power levels.29Bibliography.31SIST EN ISO 3741:2009
ISO 3741:1999(E)© ISOivForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISOmember bodies). The work of preparing International Standards is normally carried out through ISO technicalcommittees. Each member body interested in a subject for which a technical committee has been established hasthe right to be represented on that committee. International organizations, governmental and non-governmental, inliaison with ISO, also take part in the work. ISO collaborates closely with the International ElectrotechnicalCommission (IEC) on all m
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.