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1、BRITISH STANDARD BS EN ISO 4869-3:2007 Acoustics Hearing protectors Part 3: Measurement of insertion loss of ear-muff type protectors using an acoustic test fixture The European Standard EN ISO 4869-3:2007 has the status of a British Standard ICS 13.340.20 ? Licensed Copy: London South Bank Universi
2、ty, London South Bank University, Sat Aug 18 09:40:38 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS EN ISO 4869-3:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2007 BSI 2007 ISBN 978 0 580 55989 1 National foreword This Briti
3、sh Standard is the UK implementation of EN ISO 4869-3:2007. It supersedes BS EN 24869-3:1994 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee EH/1, Acoustics, to Subcommittee EH/1/1, Hearing. A list of organizations represented on this committee can be
4、 obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd
5、. No. DateComments Licensed Copy: London South Bank University, London South Bank University, Sat Aug 18 09:40:38 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 4869-3 July 2007 ICS 13.340.20Supersedes EN 24869-3:1993 English Version Acoustics - H
6、earing protectors - Part 3: Measurement of insertion loss of ear-muff type protectors using an acoustic test fixture (ISO 4869-3:2007) Acoustique - Protecteurs individuels contre le bruit - Partie 3: Mesurage de laffaiblissement acoustique des protecteurs du type serre-tte au moyen dun montage dessa
7、i acoustique (ISO 4869-3:2007) Akustik -Gehrschtzer - Teil 3: Messung der Schalldmmung von Kapselgehrschtzern unter Verwendung einer akustischen Prfvorrichtung (ISO 4869- 3:2007) This European Standard was approved by CEN on 30 June 2007. CEN members are bound to comply with the CEN/CENELEC Internal
8、 Regulations which 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 CEN Management Centre or to any CEN member.
9、 This European Standard 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 CEN Management Centre has the same status as the official versions. CEN members
10、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, Swit
11、zerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2007 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No
12、. EN ISO 4869-3:2007: E Licensed Copy: London South Bank University, London South Bank University, Sat Aug 18 09:40:38 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Foreword This document (EN ISO 4869-3:2007) has been prepared by Technical Committee ISO/TC 43 “Acoustics“ in collaboration with Technical
13、 Committee CEN/TC 211 “Acoustics“, the secretariat of which is held by DS. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by January 2008, and conflicting national standards shall be withdrawn at th
14、e latest by January 2008. This document supersedes EN 24869-3:1993. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see info
15、rmative Annex ZA, which is an integral part of this document. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finlan
16、d, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 4869-3:2007 has been approved by CEN as EN ISO 486
17、9-3:2007 without any modifications. EN ISO 4869-3:2007 Licensed Copy: London South Bank University, London South Bank University, Sat Aug 18 09:40:38 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Reference number ISO 4869-3:2007(E) INTERNATIONAL STANDARD ISO 4869-3 First edition 2007-07-01 Acoustics He
18、aring protectors Part 3: Measurement of insertion loss of ear-muff type protectors using an acoustic test fixture Acoustique Protecteurs individuels contre le bruit Partie 3: Mesurage de laffaiblissement acoustique des protecteurs du type serre-tte au moyen dun montage dessai acoustique EN ISO 4869-
19、3:2007 Licensed Copy: London South Bank University, London South Bank University, Sat Aug 18 09:40:38 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ii Licensed Copy: London South Bank University, London South Bank University, Sat Aug 18 09:40:38 GMT+00:00 2007, Uncontrolled Copy, (c) BSI iii Foreword I
20、SO (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. Each member body interested in a subject for which a technical c
21、ommittee 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. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electr
22、otechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the m
23、ember bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identi
24、fying any or all such patent rights. ISO 4869-3 was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 1, Noise. This first edition of ISO 4869-3 cancels and replaces ISO/TR 4869-3:1989, which has been technically revised. The technical changes are as follows: a) the title has bee
25、n changed and the standard has been revised; b) the content of the former subclause on “test signal” has been included in the subclause “Measuring system”; c) the subclause “Measuring system” no longer contains specific requirements concerning the measuring system; d) Annex B, dealing with uncertain
26、ty, has been added. ISO 4869 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 3: Measurement
27、 of insertion loss of ear-muff type protectors using an acoustic test fixture Part 4: Measurement of effective sound pressure levels for level-dependent sound-restoration ear-muffs Technical Report Part 5: Method for estimation of noise reduction using fitting by inexperienced test subjects Technica
28、l Specification Part 6, Measurement of the active noise reduction of hearing protectors, is under preparation. EN ISO 4869-3:2007 Licensed Copy: London South Bank University, London South Bank University, Sat Aug 18 09:40:38 GMT+00:00 2007, Uncontrolled Copy, (c) BSI iv Introduction A Technical Repo
29、rt describing the use of an acoustic test fixture (ATF) to measure the insertion loss of ear- muff type protectors was published as ISO/TR 4869-3 in 1989. As testing laboratories around the world commonly use the ATF, it was decided that this Technical Report should be revised and changed into an In
30、ternational Standard. Compared to the original Technical Report, the most important aspect of this part of ISO 4869 is the specification of the ATF. The ATF specified herein is not intended to supplant those dummy heads which include simulation of various anatomical features and which are used, for
31、example, for development testing purposes. The method specified in this part of ISO 4869 does not provide results which are the same as those obtained by the subjective method, ISO 4869-1. EN ISO 4869-3:2007 Licensed Copy: London South Bank University, London South Bank University, Sat Aug 18 09:40:
32、38 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 1 Acoustics Hearing protectors Part 3: Measurement of insertion loss of ear-muff type protectors using an acoustic test fixture 1 Scope This part of ISO 4869 specifies a method for measuring the insertion loss of ear-muff type hearing protectors using an
33、 acoustic test fixture. The method is applicable to the investigation of production spreads of performance as part of type approval or certification procedures, and to the investigation of the change of performance with age. It is intended to ensure that ear-muff hearing protector samples submitted
34、for subjective testing of attenuation according to ISO 4869-1 have performances typical of the type. The method specified in this part of ISO 4869 is not applicable as the basic test for type approval. Performance data obtained by this method are not intended to be quoted as representing the real-ea
35、r sound attenuation of an ear-muff, nor the protection provided by the ear-muff. For the testing of certain ear-muffs (such as those attached to safety helmets, or those with contoured ear- cups or ear-cushions, or supra-aural ear-muffs), the procedure described in this part of ISO 4869 might need t
36、o be modified. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 48, Rub
37、ber, vulcanized or thermoplastic Determination of hardness (hardness between 10 IRHD and 100 IRHD) ISO 4869-1, Acoustics Hearing protectors Part 1: Subjective method for the measurement of sound attenuation ISO/IEC Guide 98:1995, Guide to the expression of uncertainty in measurement (GUM) IEC 60263,
38、 Scales and sizes for plotting frequency characteristics and polar diagrams IEC 61260, Electroacoustics Octave-band and fractional-octave-band filters IEC 61094-4, Measurement microphones Part 4: Specifications for working standard microphones EN ISO 4869-3:2007 Licensed Copy: London South Bank Univ
39、ersity, London South Bank University, Sat Aug 18 09:40:38 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 2 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 hearing protector device worn by a person to reduce unwanted auditory effects from acoustic
40、 stimuli 3.2 ear-muff hearing protector consisting of a supra-aural ear-cup to be pressed against each pinna or of a circumaural ear-cup to be pressed against the head around the pinna NOTE The ear-cups can be pressed against the head with a special headband or neck-band or by means of a device atta
41、ched to a safety helmet or other equipment. 3.3 head-strap flexible strap fitted to each cup, or to the headband close to the cup NOTE The strap can be adjusted to support the ear-muffs, usually for behind-the-head types, by resting on the top of the head. 3.4 acoustic test fixture ATF device that a
42、pproximates certain dimensions of an average adult human head NOTE An ATF is used for measuring the insertion loss of hearing protectors of the ear-muff type and includes a microphone for measuring sound pressure levels. 3.5 insertion loss algebraic difference, in decibels, between the one-third-oct
43、ave-band sound pressure level measured by the microphone of the acoustic test fixture with the hearing protector absent and the sound pressure level with the hearing protector present 3.6 pink noise noise in which sound power spectral density is inversely proportional to frequency 3.7 acoustic isola
44、tion algebraic difference, in decibels, between the one-third-octave-band sound pressure level measured by the microphone of the acoustic test fixture with a specially designed sound isolation test cup absent and the sound pressure level with the specially designed sound isolation test cup present 3
45、.8 noise floor output level of the measurement system with the test signal switched off and a test cup providing sufficient acoustic isolation in position 3.9 reference point midpoint of a line connecting the centres of the two end faces of the acoustic test fixture EN ISO 4869-3:2007 Licensed Copy:
46、 London South Bank University, London South Bank University, Sat Aug 18 09:40:38 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 3 4 Measurement principle The level of a test signal in a defined sound field is measured by a microphone located in an acoustic test fixture (ATF). The level is measured witho
47、ut and with the microphone being occluded by the ear-muff under test. The difference between the two measurement results is the insertion loss of the hearing protector. The ATF shall allow an ear-muff to be placed properly by positioning one ear-cup of the hearing protector over a measuring micropho
48、ne. 5 Measurement of the insertion loss of ear-muffs 5.1 Acoustic test fixture (ATF) 5.1.1 General An example of an ATF is given in Figure 1. 5.1.2 Description The ATF shall be made of a non-magnetic material, for example aluminium alloy or brass. It shall be in the shape of a cylinder with its axis
49、 horizontal and with (145 1) mm between the centres of the two end faces. The diameter of the cylinder shall be (135 5) mm. The angles of each of the two end faces shall be inclined towards the top at 4,5 0,5 to a vertical plane. The measuring microphone shall be of type WS1P or WS2P in accordance with IEC 61094-4. It shall be of the pressure-operated condenser type. The microphone shall be placed with its centre axis coinciding with the centre