EN ISO 3743-1:2009

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Akustik - Bestimmung der Schalleistungspegel von Geräuschquellen - Verfahren der Genauigkeitsklasse 2 für kleine, transportable Quellen in Hallfeldern - Teil 1: Vergleichsverfahren in Prüfverfahren mit schallharten Wänden (ISO 3743-1:1994)Acoustique - Détermination des niveaux de puissance acoustique émis par les sources de bruit - Méthodes d'expertise en champ réverbéré applicables aux petites sources transportables - Partie 1: Méthode par comparaison en salle d'essai à parois dures (ISO 3743-1:1994)Acoustics - Determination of sound power levels of noise sources - Engineering methods for small, movable sources in reverberant fields - Part 1: Comparison method for hard-walled test rooms (ISO 3743-1:1994)17.140.01Acoustic measurements and noise abatement in generalICS:Ta slovenski standard je istoveten z:EN ISO 3743-1:2009SIST EN ISO 3743-1:2009en01-november-2009SIST EN ISO 3743-1:2009SLOVENSKI
STANDARDSIST EN ISO 3743-1:19971DGRPHãþD

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN ISO 3743-1July 2009ICS 17.140.01Supersedes EN ISO 3743-1:1995
English VersionAcoustics - Determination of sound power levels of noisesources - Engineering methods for small, movable sources inreverberant fields - Part 1: Comparison method for hard-walledtest rooms (ISO 3743-1:1994)Acoustique - Détermination des niveaux de puissanceacoustique émis par les sources de bruit - Méthodesd'expertise en champ réverbéré applicables aux petitessources transportables - Partie 1: Méthode parcomparaison en salle d'essai à parois dures (ISO 3743-1:1994)Akustik - Bestimmung der Schalleistungspegel vonGeräuschquellen - Verfahren der Genauigkeitsklasse 2 fürkleine, transportable Quellen in Hallfeldern - Teil 1:Vergleichsverfahren in Prüfverfahren mit schallhartenWänden (ISO 3743-1:1994)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 3743-1:2009: ESIST EN ISO 3743-1:2009

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 3743-1:2009

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 3743-1:2009

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.
INTERNATIONAL STANDARD ISO 3743-1 First edition 1994-02-15 Acoustics - Determination of Sound power levels of noise sources - Engineering methods for small, movable sources in reverberant fields - Part 1: Comparison method for hard-walled test rooms Acoustique - Determination des niveaux de puissance acoustique 6mis par /es sources de bruit - Methodes d’expertise en champ r&erb&6 applicables aux petites sources transportables - Partie 1: M6thode par comparaison en salle d’essai ti parois dures Reference number ISO 3743-1: 1994(E) SIST EN ISO 3743-1:2009

ISO 3743=1:1994(E) Contents Page 1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 Normative references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3 Def initions .,. 3 4 Requirements for hard-walled test room . 4 5 Instrumentation . 5 6 Installation and Operation of Source under test . 5 7 Measurements in test room . 6 8 Calculation of Sound power levels . 8 9 Information to be recorded . 8 10 Information to be reported . 9 Annex A Bibliography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 63 ISO 1994 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronie or mechanical, including photocopying and microfilm, without per- mission in writing from the publisher. International Organization for Standardization Case Postale 56 l CH-l 211 Geneve 20 l Switzerland Printed in Switzerland ii SIST EN ISO 3743-1:2009

ISO 374391:1994(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national Standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Esch member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take patt in the work. ISO collaborates closely with the International Electrotechnical Commission (1 EC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 3743-1 was prepared by Technical Committee lSO/TC 43, Acoustics, Sub-Committee SC 1, Noise. ISO 3743 consists of the following Parts, under the general title Acoustics - Determination of Sound power levels of noise sources - Engineering methods for small, movable sources in reverberant fields: - Part 1: Comparison method for hard-waled test rooms - Part 2: Methods for special reverberation test rooms Part 2 is a revision of ISO 3743:1988. Annex A of this part of ISO 3743 is for information only. . . . Ill SIST EN ISO 3743-1:2009

ISO 3743=1:1994(E) Introduction 0.1 ISO 3743 is one of the ISO 3740 series, which specifies various methods for determining the Sound power levels of machines, equipment and their sub-assemblies. These basic Standards specify the acoustical requirements for measurements appropriate for different test environ- ments as shown in table 0.1. When selecting one of the methods of the ISO 3740 series, it is necessary to select the most appropriate for the conditions and purposes of the noise test. General guidelines to assist in the selection are provided in ISO 3740. The ISO 3740 series gives only general principles regarding the operating and mounting conditions of the machine or equipment under test. Reference should be made to the noise test code for a specific type of machine or equipment, if available, for specifications on mounting and operating conditions. 0.2 The method given in this part of ISO 3743 enables measurement of Sound pressure levels in octave bands at prescribed fixed microphone positions or along prescribed paths. A comparison method is used which allows determination of Sound power levels in octave bands; A-weighted Sound power Ievels may be calculated from the octave-band Sound power Ievels. Quantities which cannot be determined are the directivity charac- teristics of the Source and the temporal Pattern of noise radiated by sources emitting non-steady noise. 0.3 Parts 1 and 2 of ISO 3743 specify engineering methods for deter- mining the A-weighted and octave-band Sound power Ievels of small noise sources. The methods are applicable to small machines, devices, compo- nents and sub-assemblies which tan be installed in a hard-walled test room with prescribed acoustical characteristics or in a special reverber- ation test room. The methods are particularly suitable for small items of portable equipment; they are not intended for larger pieces of stationary equipment which, due to their manner of Operation or installation, cannot readily be moved into the test room and operated as in normal usage. The procedures are intended to be used when an engineering grade of accu- racy is desired without requiring the use of laboratory facilities. iv SIST EN ISO 3743-1:2009

International Classification of Test environment Volume of Source Sound power levels Optional information Standard Character of noise methodl) obtainable available 3741 Reverberation room Steady, broad-band Precision (grade 1) In one-thirdoctave or A-weighted Sound power meeting specified require- 3742 Steady, discrete fre- ments octave bands level Preferably less than 1 % quency or narrow-band 3743-1 Hard-walled test room of test room volume Steady, broad-band, ’ Engineering (grade 2) A-weighted and in octave Other weighted Sound Special reverberation test narrow-band, or discrete 3743-2 frequency bands power levels room 3744 Engineering (grade 2) Outdoors or in large room Greatest dimension less than 15 m Av Directivity information A-weighted and in one- and Sound pressure levels Preferably less than ’ third-octave or octave as a function of time; 3745 Precision (grade 1) Anechoic or semi- 0,5 % of test room vol- AnY bands other weighted Sound anechoic room ume power levels No restrictions; limited Sound pressure levels as 3746 Survey (grade 3) No special test environ- only by available test en- AnY A-weighted a function of time; other ment vironment weighted Sound power levels No special test environ- Steady, broad-band, 3747 Survey (grade 3) ment; Source under test No restrictions Sound power levels in narrow-band, or discrete A-weighted not movable frequency octave bands 1) See ISO 2264. SIST EN ISO 3743-1:2009

ISO 374
...