DD-ISO-TS-4869-5-2006.pdf
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1、DRAFT FOR DEVELOPMENT DD ISO/TS 4869-5:2006 Acoustics Hearing protectors Part 5: Method for estimation of noise reduction using fitting by inexperienced test subjects ICS 13.340.20 ? Licensed Copy: London South Bank University, London South Bank University, Sat Dec 30 06:07:49 GMT+00:00 2006, Uncont
2、rolled Copy, (c) BSI DD ISO/TS 4869-5:2006 This Draft for Development was published under the authority of the Standards Policy and Strategy Committee on 29 December 2006 BSI 2006 ISBN 0 580 49881 6 National foreword This Draft for Development was published by BSI. It is the UK implementation of ISO
3、/TS 4869-5:2006. This publication is not to be regarded as a British Standard. It is being issued in the Draft for Development series of publications and is of a provisional nature. It should be applied on this provisional basis, so that information and experience of its practical application can be
4、 obtained. Comments arising from the use of this Draft for Development are requested so that UK experience can be reported to the international organization responsible for its conversion to an international standard. A review of this publication will be initiated not later than 3 years after its pu
5、blication by the international organization so that a decision can be taken on its status. Notification of the start of the review period will be made in an announcement in the appropriate issue of Update Standards. According to the replies received by the end of the review period, the responsible B
6、SI Committee will decide whether to support the conversion into an international Standard, to extend the life of the Technical Specification or to withdraw it. Comments should be sent to the Secretary of the responsible BSI Technical Committee at British Standards House, 389 Chiswick High Road, Lond
7、on W4 4AL. 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 EH/1/1 can be obtained on request to its secretary. This publication does not purport to include all the necessary provisio
8、ns of a contract. Users are responsible for its correct application. Amendments issued since publication Amd. No. DateComments Licensed Copy: London South Bank University, London South Bank University, Sat Dec 30 06:07:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference number ISO/TS 4869-5:2006
9、(E) TECHNICAL SPECIFICATION ISO/TS 4869-5 First edition 2006-10-15 Acoustics Hearing protectors Part 5: Method for estimation of noise reduction using fitting by inexperienced test subjects Acoustique Protecteurs individuels contre le bruit Partie 5: Mthode destimation de la rduction du bruit au moy
10、en de rglages par des sujets dessai non expriments DD ISO/TS 4869-5:2006 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 30 06:07:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii Licensed Copy: London South Bank University, London South Bank University, Sat Dec 30
11、06:07:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iii Contents Page Foreword. v Introduction vii 1 Scope . 1 2 Normative references. 1 3 Terms and definitions. 2 4 Measurement of the noise reduction of hearing protectors 3 4.1 Test signals . 3 4.2 Test site . 3 4.2.1 Conditions to be met for the t
12、est to be valid . 3 4.2.2 Reverberation time . 4 4.2.3 Background noise. 4 4.3 Test equipment . 5 5 Test subjects. 6 5.1 Conditions for subject acceptance/dismissal . 6 5.1.1 General. 6 5.1.2 Age and sex. 6 5.1.3 Previous experience with hearing protectors 7 5.1.4 Anatomical features 7 5.1.5 Maximum
13、 hearing threshold levels. 7 5.1.6 Minimum hearing threshold levels 7 5.1.7 Literacy 7 5.1.8 Threshold variability. 7 5.2 Number of subjects 7 5.3 Otoscopic inspection . 8 5.4 Spectacles and jewellery . 8 5.5 Maximum number of tests per subject. 8 5.6 Exceptions. 8 6 Product samples. 8 6.1 General.
14、8 6.2 Custom-moulded ear-plugs. 8 6.3 Special requirements for product instruction . 8 6.4 Variable position headbands. 9 6.5 Variable band force. 9 7 Test procedure 9 7.1 Number of open-ear and occluded-ear threshold measurements. 9 7.2 Information to subjects 9 7.3 Prior to entering the test room
15、10 7.4 Inside the test room 10 7.4.1 Positioning the subject 10 7.4.2 Quiet period prior to first threshold determination. 11 7.4.3 Fitting the hearing protector for test 11 7.4.4 Re-determination of thresholds 11 8 Computation of noise reduction values. 12 8.1 General. 12 8.2 Calculation of the ind
16、ividual noise reductions 12 8.3 Calculation of group noise reduction. 12 8.4 Uncertainty of the noise reduction data. 13 DD ISO/TS 4869-5:2006 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 30 06:07:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv 9 Reporting of d
17、ata 13 Annex A (informative) Uncertainty of hearing protector noise reduction measurements15 Bibliography .18 DD ISO/TS 4869-5:2006 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 30 06:07:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI v Foreword ISO (the Internatio
18、nal 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 committee has been
19、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 electrotechnical standar
20、dization. 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 member bodies for v
21、oting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. In other circumstances, particularly when there is an urgent market requirement for such documents, a technical committee may decide to publish other types of normative document: a
22、n ISO Publicly Available Specification (ISO/PAS) represents an agreement between technical experts in an ISO working group and is accepted for publication if it is approved by more than 50 % of the members of the parent committee casting a vote; an ISO Technical Specification (ISO/TS) represents an
23、agreement between the members of a technical committee and is accepted for publication if it is approved by 2/3 of the members of the committee casting a vote. An ISO/PAS or ISO/TS is reviewed after three years in order to decide whether it will be confirmed for a further three years, revised to bec
24、ome an International Standard, or withdrawn. If the ISO/PAS or ISO/TS is confirmed, it is reviewed again after a further three years, at which time it must either be transformed into an International Standard or be withdrawn. Attention is drawn to the possibility that some of the elements of this do
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