1、 STD-BSI BS EN IS0 VBbS-V-ENGL 2000 S Lb2qbbS 0859030 787 S BRITISH STANDARD Acoustics - Hearing protectors - Part 4: Measurement of effective sound pressure levels for level-dependent sound-restoration ear muffs (ISOLtR 4869-4:1998) The European Standard EN IS0 486942000 has the status of a British
2、 Standard ICs 13.340.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN IS0 4869-4:ZOOO STD-BSI BS EN IS0 qBb7-4-ENGL 2000 m Lb24bb7 0857033 bL3 m BS EN IS0 4869-4:ZO been prepared under the direction of the Health and Amd. No. Date Environment Sector Committee, was publ
3、ished under the authority of the Standards Committee and comes into effect on 15 August 2000 O BSI 082000 National foreword Comments This British Standard is the official English language version of EN IS0 48644:2000. It is identical with ISO/TR 48694 1998. The UK participation in its preparation wa
4、s entrusted to Technical Committee PW7, Hearing protection, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible internationallEuropean committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; - monit
5、or related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists no
6、rmative references to international publications with their corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index“, o
7、r by using the “Find facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer i
8、mmunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN IS0 title page, the EN IS0 foreword page, the ISOKE title page, pages ii to iv, pages 1 to 7, the annex ZA page, an inside back cover and a back cover. The BSI copyright notice displ
9、ayed in this document indicates when the document was last issued. ISBN O 580 34952 7 I STD.BSI BS EN IS0 qBb7-4-ENGL 2000 Lb24bb7 0857032 55T EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN IS0 48694 May 2000 ICs 13.340.20 English version Acoustics - Hearing protectors - Part 4: Measurement of
10、 effective sound pressure levels for level-dependent sound- restoration ear-muffs (ISOnR 4869-4: 1998) Acoustique - Protecteurs individuels contre le bruit - Partie 4: Mesurage des niveaux effectifs de pression acoustique des serre-ttes destins la restitution du son (iSO/TR 4869-4: 1998) Akustik - G
11、ehrschtzer - Teil 4: Messung der wirksamen Schalldruckpegel von Kapselgehrschtzern mit pegelabhngiger elektroakustischer bertragungseinrichtung (iSO/TR 486941 998) This European Standard was approved by CEN on 10 April 2000. CEN members are bound to comply with the CENKENELEC Internal Regulations wh
12、ich stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European St
13、andard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national st
14、andards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITEE FOR STANDARDIZATION COMITE EUROPEEN DE NORMALISATION EUROPISCHES KOMITEE
15、 FR NORMUNG Central Secretariat: rue de Stassart. 36 8-1050 Brussels O 2000 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN IS0 486942000 E STD-BSI BS EN IS0 48b7-4-ENGL 2000 W Lb2qbbS CI857033 q9b EN IS0 4869-4:2000 Foreword The t
16、ext of the International Standard from Technical Committee ISOTTC 43 “Acoustics“ of the International Organization for Standardization (ISO) has been taken over as an European Standard by Technical Cornmittee CEN/TC 21 1 “Acoustics“, the secretariat of which is held by DS. This European Standard sha
17、ll be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2000, and conflicting national standards shall be withdrawn at the latest by November 2000. This European Standard has been prepared under a mandate given to CEN by
18、the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium,
19、Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of the International Standard IS0 4869-4:1998 has been approved by CEN as a European Standard
20、without any modification. NOTE: Normative references to International Standards are listed in annex ZA (normative). STD-BSI BS EN IS0 4Ab9-4-ENGL 2000 Lb24bb7 0859034 3Z2 E EN IS0 4869-4:ZOOO TECHNICAL REPORT ISO/TR First edition 1998-10-01 Acoustics - Hearing protectors - Part 4: Measurement of eff
21、ective sound pressure I eve Is for I eve I -dependent so und- rest o rat i on ear-muffs Acoustique - Protecteurs individuels contre le bruit - Partie 4: Mesurage des niveaux effectifs de pression acoustique des serre- tte destins i la restitution du son .- =WE . Reference number IS0 4869-411 998( E)
22、 STDoBSI BS EN IS0 48b7-9-ENGL 2000 B Lb24bb7 0857035 2b7 II EN IS0 4869-4:2000 Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through
23、IS0 technical committees. Each 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 part in the work. IS0 collaborate
24、s closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. The main task of technical committees is to prepare International Standards
25、, but in exceptional circumstances a technical committee may propose the publication of a Technical Report of one of the following types: - type 1, when the required support cannot be obtained for the publication of an International Standard, despite repeated efforts; - type 2, when the subject is s
26、till under technical development or where for any other reason there is the future but not immediate possibility of an agreement on an International Standard; type 3, when a technical committee has collected data of a different kind from that which is normally published as an International Standard
27、(“state of the art“, for example). - Technical Reports of types 1 and 2 are subject to review within three years of publication, to decide whether they can be transformed into International Standards. Technical Reports of type 3 do not necessarily have to be reviewed until the data they provide are
28、considered to be no longer valid or useful. ISO/TR 4869-4, which is a Technical Report of type 2, was prepared by Technical Committe ISOTTC 43, Acoustics, Subcommittee SC 1, Noise. II STD-BSI BS EN IS0 48b7-q-ENGL 2000 E Lb24bb9 085903b 1T5 EN IS0 4869-4:2000 A first CD 4869-4, doc. 43/1 N 924, base
29、d on a miniature micro- phone technique, was circulated for comments in the period 1994-06-30/1994-09-30. The comments, given in doc. 43/1 N 948, showed that such a draft could not be expected to obtain sufficient support. WG 17 then prepared a completely revised draft based on a simplified procedur
30、e and using an artificial test fixture (ATF) which was circulated as a second CD, doc. 43/1 N 972, in the period 1995-01 -0111 995-03-10. The comments given in doc. 43/1 N 985, showed that the second CD 4869-4 did not have major support either. WG 17 therefore prepared a revised document, still base
31、d on the ATF but with the scope restricted to sound restoration ear-muffs which was circulated as a Draft Technical Report, doc. 43/1 N 986, in the period 1995-10-10/1996-01-10. The votes and comments, given in doc. 43/1 N 1039, showed 16 approvals and 4 disapprovals. Based on these comments, WG 17
32、prepared a second draft Technical Report 4869-4, doc. 43/1 N 1069, which was circulated for voting in the period 1997-05-1 5/1997-08-20 and approved with 15 approvals and 2 disapprovals as given in doc. 43/1 N 1148. The two disapprovals were requesting a technique based on the use of miniature micro
33、phones which cannot be incorporated in the present document. Thus, the second TR, with some editorial amendments, is issued as a Technical Report, and the question of the preparation of a possible standard based on a miniature microphone technique must be the subject of a separate discussion and dec
34、ision in ISOTTC 43/SC 1. IS0 4869-4 consists of the following parts, under the general title Acoustics - Hearing protectors: - Part 1: Subjective method for the measurement of sound attenuation - Part 2: Estimation of effective A-weighted sound pressure levels when hearing protectors are worn - Part
35、3: Simplified method for the measurement of insertion loss of ear-muff type protectors for quality inspection purposes - Part 4: Measurement of effective sound pressure levels for level- dependent sound-restoration ear-muffs Annex A of this part of IS0 4869 is for information only. iii - STD-BSI BS
36、EN IS0 ?iBbS-Y-ENGL 2000 M 1b21ibb7 0659037 O31 EN IS0 4869-4:2000 I nt rod uct ion Measurement of sound attenuation according to IS0 4869-1 is intended for conventional, passive hearing protectors where the attenuation is in- dependent of the level of the noise outside the hearing protector. Hearin
37、g protectors with level-dependent operation are also available. Such oper- ation is usually obtained by means of electro-acoustic components. The level-dependent characteristics of such protectors cannot be determined using the procedures of IS0 4869-1. The present technical report provides a physic
38、al method for the determination of the characteristics of level- dependent sound restoration ear-muffs. The passive sound attenuation characteristics of sound restoration ear-muffs should be measured in accordance with IS0 4869-1. STD-BSI BS EN IS0 48b7-9-ENGL 2000 m lb29bb 0857038 T78 E EN IS0 4869
39、-4:2000 Acoustics - Hearing protectors - Part 4: Measurement of effective sound pressure levels for level-dependent sound- restoration ear-m uffs 1 Scope This Technical Report specifies a physical test method for level-dependent sound-restoration ear-muffs. The physical measurements are made with th
40、e acoustic test fixture (ATF) according to ISO/TR 4869-3 or with a suitable head and torso simulator (HATS) with a suitable acoustic isolation (see clause 7). The results of these tests in combination with the results from the IS0 4869-1 tests can be used to estimate the effective A-weighted sound p
41、ressure levei when sound restoration ear-muffs are worn. The method described is not suitable for measurement of the effective sound pressure level under ear-muffs in the case of impulsive noise nor for active noise reduction ear-muffs. 2 Normative references The following normative documents contai
42、n provisions which, through reference in this text, constitute provisions of this pari of IS0 4869. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of IS0 4869 are encouraged to investigate the
43、 possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 4869-1 :1990, Acoustics -
44、Hearing protectors - Part I: Subjective method for the measurement of sound attenuation. IS0 4869-2, Acoustics - Hearing protectors - Part 2: Estimation of effective A-weighted sound pressure levels when hearing protectors are worn. ISO/TR 4869-3:1989, Acoustics - Hearing protectors - Part 3: Simpli
45、fied method for the measurement of insertion loss of ear-muff type protectors for quality inspection purposes. IEC 60651, Sound level meters. I EC 61 094-4, Measurement microphones - Part 4: Specifications for working standard microphones. IEC 61 260, Electroacoustics - Octave-band and fractional-oc
46、tave-band filters. 1 STD-BSI BS EN IS0 48b9-4-ENGL 2000 Lb24bb9 0859037 904 = EN IS0 4869-42000 3 Terms and definitions For the purposes of this Technical Report, the terms and definitions given in IS0 4869-1, IS0 4869-2 and ISO/TR 4869-3, and the following apply. 3.1 reference microphone calibrated
47、 microphone meeting the requirements for WS2D microphones given in IEC 61094-4, not located in the acoustic test fixture, which is used to measure sound pressure levels in the test chamber 3.2 reference point location in the test chamber to which all acoustical measurements are referred, and at whic
48、h the midpoint of a line connecting the centres of the two end faces of the acoustic test fixture is located 3.3 sound-restoration ear-muff sound-transmission ear-muff ear-muff intended to reproduce external sounds within the ear-cup NOTE dependency). A sound-restoration ear-muff exhibits a change i
49、n attenuation as a function of sound pressure level (.e. level 3.4 pink noise noise whose power spectral density is inversely proportional to frequency 3.5 effective A-weighted sound pressure level for level-dependent sound-restoration ear-muffs for a specific noise situation, the A-weighted sound pressure level effective when a given level-dependent sound- restoration hearing protector is worn, calculated from results of measurements on ATF/HATS in active and passive mode and with corrections for bone conduction and leakage NOTE transmis
