SANS 50352-5-2005 Hearing protectors - Safety requirements and testing Part 5 Active noise reduction ear-muffs《听力保护器 安全要求及测试方法 第5部分 主动降噪耳套》.pdf

1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA

2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any

3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ICS 13.340.20 ISBN 0-626-17318-3 SANS 50352-5:2005Edition 1EN 352-5:2002Edition 1SOUTH AFRICAN NATIONAL STANDARD Hearing protectors Safety requirements a

4、nd testing Part 5: Active noise reduction ear-muffs This national standard is the identical implementation of EN 352-5:2002 and is adopted with the permission of CEN, rue de Stassart 36, B-1050 Brussels. Published by Standards South Africa 1 dr lategan road groenkloof private bag x191 pretoria 0001

5、tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 50352-5:2005 Edition 1 EN 352-5:2002 Edition 1 Table of changes Change No. Date Scope Abstract Specifies constructional, design and performance requirements, methods of test, marking requireme

6、nts and user information relating to the incorporation of the active noise reduction facility of ear-muffs. Keywords ear-muffs, ear protectors, occupational safety, protective equipment, protectors. National foreword This South African standard was approved by National Committee StanSA TC 76, Acoust

7、ics, electro-acoustics and vibration, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. Note that in annex A no mention is made of the confidence level to be used when applying the uncertainty of measurement. It is proposed that K=2 or a 95

8、 % confidence level is used. EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 352-5December 2002ICS 13.340.20English versionHearing protectors - Safety requirements and testing - Part 5:Active noise reduction ear-muffsProtecteurs individuels contre le bruit - Exigences descurit et essais - Partie 5

9、: Serre-tte attnuation activedu bruitGehrschtzer - Sicherheitstechnische Anforderungen undPrfungen - Teil 5: Kapselgehrschtzer mit aktiverGeruschkompensationThis European Standard was approved by CEN on 16 October 2002.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which s

10、tipulate 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 Management Centre or to any CEN member.This European Standard exi

11、sts 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 Management Centre has the same status as the officialversions.CEN members are the national standards bodies

12、of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGMa

13、nagement Centre: rue de Stassart, 36 B-1050 Brussels 2002 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 352-5:2002 EEN 352-5:2002 (E)2ContentspageForeword3Introduction.41 Scope42 Normative references43 Terms and definitions .54 Req

14、uirements.55 Testing66 Information supplied by the manufacturer .77 Marking.8Annex A (informative) Uncertainty of measurement and interpretation of test results9Annex B (informative) Determination of active attenuation and spread of active attenuationfor active noise reduction ear-muffs.12Annex ZA (

15、informative) Clauses of this European standard addressing essentialrequirements or other provisions of EU Directive 14Bibliography15EN 352-5:2002 (E)3ForewordThis document (EN 352-5:2002) has been prepared by Technical Committee CEN/TC 159, “Hearingprotectors“, the secretariat of which is held by SI

16、S.This European Standard shall be given the status of a national standard, either by publication of an identicaltext or by endorsement, at the latest by June 2003, and conflicting national standards shall be withdrawn atthe latest by June 2003.This document has been prepared under a mandate given to

17、 CEN by the European Commission and theEuropean Free Trade Association, and supports essential requirements of EU Directive(s).For relationship with EU Directives, see informative Annex ZA, which is an integral part of this standard.In this standard the annexes A and B are informative.According to t

18、he CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark,Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway,Portugal, Spa

19、in, Sweden, Switzerland and the United Kingdom.EN 352-5:2002 (E)4IntroductionThis standard for ”Hearing Protectors Safety requirements and testing Part 5: Active noise reduction ear-muffs”, specifies procedures for the testing of personal hearing protection devices in relation to Directive89/686/EEC

20、 - Personal Protective Equipment.EN 352-1 deals with requirements for ear-muffs, EN 352-2 with ear-plugs, EN 352-3 with ear-muffs attachedto industrial safety helmets. EN 13819-1 and EN 13819-2 deal with testing plans common to all types ofhearing protectors covered by this series of ENs.Additional

21、safety requirements and the associated test procedures for level-dependent ear-muffs arecontained in EN 352-4, for ear-muffs with electrical audio input in prEN 352-6 and for level-dependent ear-plugs in prEN 352-7. An associated standard EN 458, covers selection, use, care and maintenance ofhearing

22、 protection.The particular requirement for hearing protectors in relation to their ability to reduce noise to below daily limitlevels set by Directive 86/188/EEC - “on the protection of workers from the risks related to exposure to noise atwork“ is addressed in the standard by means of a requirement

23、 to report the active component of attenuationprovided by the ear-muffs, to complement the passive attenuation data reported within EN 352-1.An additional acoustic performance test method to that described in EN 24869-1 and applied in EN 352-1, EN352-2 and EN 352-3 is required for active noise reduc

24、tion ear-muffs. Until such time as this work is completed thetest method described in Annex B of this standard is recommended for active noise reduction ear-muffs inaddition to the EN 24869-1 test.Active noise reduction ear-muffs are designed to provide additional attenuation of external sounds by m

25、eans of anoise cancellation circuit. This additional attenuation is usually provided at low and mid frequencies. They may beselected for use in low frequency dominated high noise environments.This part of the standard is a specification intended for type approval purposes, for which four sets of spe

26、cimenear-muffs are tested (further samples may be required for testing under EN 352-1, or EN 352-3, as appropriate).The requirements and tests of the standard are concerned primarily with the active noise reduction performanceof the ear-muffs. The standard may be applied to ear-muffs for fitting to

27、industrial safety helmets.1 ScopeThis European Standard is concerned with active noise reduction (ANR) ear-muffs. It specifies additionalconstructional, design and performance requirements, methods of test, marking requirements and userinformation relating to the incorporation of the active noise re

28、duction facility.The requirements of this standard are intended to take account of the ergonomic interaction between thewearer, the device and, where possible, the working environment in which the device is likely to be used (seeAnnex ZA of this standard and EN 458)2 Normative referencesThis Europea

29、n Standard incorporates by dated or undated reference, provisions from other publications.These normative references are cited at the appropriate places in the text and the publications are listedhereafter. For dated references, subsequent amendments to or revisions of any of these publications appl

30、y tothis European Standard only when incorporated in it by amendment or revision. For undated references thelatest edition of the publication referred to applies (including amendments).EN 352-1:2002, Hearing protectors - General requirements - Part 1: Ear-muffsEN 352-5:2002 (E)5EN 352-3:2002, Hearin

31、g protectors General requirements Part 3: Ear-muffs attached to an industrialsafety helmetEN 13819-1, Hearing protectors - Testing - Part 1: Physical test methods3 Terms and definitionsFor the purposes of this European Standard the following additional terms and definitions to those of EN 352-1:2002

32、 (or EN 352-3:2002, as appropriate) apply:3.1 active modeoperation of the ANR ear-muff with the ANR circuit switched on.3.2 passive modeoperation of the ANR ear-muff with the ANR circuit switched off.4 Requirements4.1 GeneralActive noise reduction ear-muffs shall meet the requirements of EN 352-1 (o

33、r EN 352-3, as appropriate).Additional requirements are listed below.4.2 Materials and constructionThe electronic circuit of the ANR ear-muff shall meet the electrical safety and EMC requirements appropriate tothis class of equipment.4.3 Performance4.3.1 GeneralActive noise reduction ear-muffs shall

34、 meet all the performance requirements of EN 352-1(or EN 352-3, asappropriate), including the minimum attenuation requirement in their passive mode. Additionally, therequirements specified in 4.3.2, 43.3 and 4.3.4 shall be satisfied.Specimens of ear-muffs shall be conditioned and tested as specified

35、 in 5.1.1 and 5.1.2. The scheme of testingshall be as specified in 5.1.3.4.3.2 Active attenuationThe sound output levels of the four test samples shall be measured in accordance with 5.2 and reported in wearerinformation (6.1).EN 352-5:2002 (E)64.3.3 Maximum Sound pressure Level for linear operation

36、The highest level of the external test noise for which the sound pressure level at the subjects ear remains linearlyrelated to the external sound pressure level, for all subjects and samples tested, shall be determined and reportedin wearer information (6.1).4.3.4 Oscillation and acoustic malfunctio

37、nWhen tested in accordance with 4.3.2, none of the subjects shall have perceived sustained oscillation oracoustic malfunction (whistling or instability) when the ear-muff has been fitted in accordance with themanufacturers instructions.5 Testing5.1 Specimens, conditioning and scheme of testingThis s

38、cheme of testing is additional to that described in EN 13819-1. It shall be carried out on additionalsamples. Estimates of uncertainty shall be presented with results, according to Annex A.5.1.1 SpecimensFour pairs of ear-muffs shall be submitted for testing. The individual ear-muff cups shall be nu

39、mbered 1 to 8.Fresh batteries, if any are installed in the ear-muffs, shall be fitted for the tests.5.1.2 Conditioning and testing atmosphereAll specimens shall be conditioned and tested in an atmosphere having a temperature of 22 oC 5 oC and arelative humidity of not more than 85 %, as required in

40、EN 13819-1.5.1.3 Scheme of testingThe eight ear-muff cups shall be tested for active attenuation as described in 5.2 and for linearity as describedin 5.35.2 Active attenuationThe acoustic measurements for active noise reduction ear-muffs are under consideration. For the time beingand because of the

41、urgent need, such measurements may be carried out in accordance with test proceduresdescribed in Annex B.5.3 Maximum Sound Pressure Level for linear operationThe acoustic measurements for active noise reduction ear-muffs are under consideration. For the time being andbecause of the urgent need, such

42、 measurements may be carried out in accordance with test proceduresdescribed in Annex B.EN 352-5:2002 (E)76 Information supplied by the manufacturer6.1 Wearer informationThe following information for the wearer (in addition to that required by EN 352-1) shall be supplied with theear-muffs:a) the num

43、ber of this standard, EN 352-5;b) an indication as to whether the hearing protector provides an active noise reduction facility;c) the values of the active attenuation as determined by the procedures described in the Annex B;d) recommended storage conditions before and after use;e) maintaining of ba

44、tteries;f) for ear-muffs with an active noise reduction facility, the statements:1) “This ear-muff is provided with active noise reduction. The wearer should check correct operationbefore use. If distortion or failure is detected, the wearer should refer to the manufacturers advice formaintenance an

45、d replacement of the battery.”2) “Warning: performance may deteriorate with battery usage. The typical period of continuous use thatcan be expected from the ear-muff battery is . hours” (to be inserted by the manufacturer).3) “Warning: the performance of the active noise reduction may be adversely a

46、ffected when sustainedoscillation (whistling or instability) is perceived. If refitting the ear-muff or replacement of the batteries, iffitted, does not overcome this malfunction, the wearer should contact the supplier or manufacturer.”g) the address from which additional information can be obtained

47、.Information according with 6.1 shall be provided at least in the official language(s) of the European state ofdestination.6.2 Additional informationThe following information shall be available from the manufacturer on request:a) results of tests performed in accordance with this European Standard;b

48、) the name and country of the test laboratory which performed the tests specified and the date of the tests.Information according with 6.2 shall be provided at least in the official language(s) of the European state ofdestination.EN 352-5:2002 (E)87 MarkingThe requirements for marking given in EN 35

49、2-1 shall be used. The generic mark “EN 352” as specified in EN352-1 is used, since a product may meet EN 352-1 and EN 352-5 simultaneously.EN 352-5:2002 (E)9Annex A(informative)Uncertainty of measurement and interpretation of test resultsFor each of the required measurements performed in accordance with this standard, a correspondingestimate of the uncertainty of measurement should be evaluated.This estimate of uncertainty should be applied and stated when reporting test results, in order to enable theuser of the test report to assess the reliability of th