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1、 INTERNATIONAL STANDARD IEC 60268-5 2003 AMENDMENT 1 2007-07 Amendment 1 Sound system equipment Part 5: Loudspeakers Reference number IEC 60268-5 Amend. 1:2007(E) Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=Wing, B
2、ernie Not for Resale, 07/16/2007 01:22:21 MDTNo reproduction or networking permitted without license from IHS -,-,- THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2007 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utiliz
3、ed in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IEC or IECs member National Committee in the country of the requester. If you have any questions about IEC copyright or have an enquiry about obtaining additional
4、 rights to this publication, please contact the address below or your local IEC member National Committee for further information. IEC Central Office 3, rue de Varemb CH-1211 Geneva 20 Switzerland Email: inmailiec.ch Web: www.iec.ch About the IEC The International Electrotechnical Commission (IEC) i
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8、ack on this publication or need further assistance, please visit the Customer Service Centre FAQ or contact us: Email: csciec.ch Tel.: +41 22 919 02 11 Fax: +41 22 919 03 00 Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, U
9、ser=Wing, Bernie Not for Resale, 07/16/2007 01:22:21 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD IEC 60268-5 2003 AMENDMENT 1 2007-07 Amendment 1 Sound system equipment Part 5: Loudspeakers D For price, see current catalogue PRICE CODE Commission
10、Electrotechnique Internationale International Electrotechnical Commission Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 07/16/2007 01:22:21 MDTNo reproduction or networking permitted with
11、out license from IHS -,-,- 2 60268-5 Amend. 1 IEC:2007(E) FOREWORD This amendment has been prepared by IEC technical committee 100: Audio, video and multimedia systems and equipment. The text of this amendment is based on the following documents: CDV Report on voting 100/1189/CDV 100/1245/RVC Full i
12、nformation on the voting for the approval of this amendment can be found in the report on voting indicated in the above table. The committee has decided that the contents of this amendment and the base publication will remain unchanged until the maintenance result date indicated on the IEC web site
13、under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. _ Page 13 Replace the existing Clause 14 by t
14、he following new Clause 14: 14 Marking of terminals and controls 14.1 General The terminals and controls shall be marked in accordance with IEC 60268-1 and IEC 60268-2 by the following principles. 14.2 Positive terminal 14.2.1 Characteristic to be specified The terminal of a drive unit (see Note 1 i
15、n Clause 1), to which the application of a positive voltage with respect to the other terminal results in an increase of sound pressure at the front of the drive unit shall be specified as the positive terminal. 14.2.2 Marking The positive terminal shall be marked with a + symbol, or a red marking,
16、or in a way stated by the manufacturer. Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 07/16/2007 01:22:21 MDTNo reproduction or networking permitted without license from IHS -,-,- 60268-5
17、 Amend. 1 IEC:2007(E) 3 14.2.3 Method of test Apply a positive d.c. voltage briefly to the terminal marked as positive. Examine the change of sound pressure at a point close to the front of the drive unit. Correct marking is confirmed by an increase of sound pressure. NOTE 1 The increase of sound pr
18、essure is produced by a positive excursion, i.e., the loudspeaker diaphragm coming closer to the microphone. NOTE 2 Any other method which produces the same result as the method described above can be used. Page 17 17 Input voltage Add the following new subclause: 17.1.3 Listening test for normal op
19、eration A listening test for normal operation may be conducted according to Annex D. Add, on page 19, the following new subclause: 17.4.3 Listening test for mechanical noise (rattles) A listening test for mechanical noise (rattles) may be conducted according to Annex D. Page 45 Annex B Standard meas
20、uring enclosure type B Replace, on page 46, the existing Table B.1 by the following new Table B.1: Table B.1 Dimensions and ratios of scalable enclosure type B Enclosure dimensions Symbol Ratios Width internal external Wi We 1 NA Height internal external Hi He 1,202 NA Depth 1 internal external D1i
21、D1e 1,274a NA Depth 2 internal external D2i D2e 1,596a NA Radius R 100 mm Panel thickness 24 mm (Vnb 100) 18 mm (Vnb 100) Side panel bracing 1 or 2 NOTE Symbol “i” means internal and “e” means external measurement. NA means not applicable the dimension is controlled by other specified dimensions. a
22、The average depth ratio Di = 1,435 and the back panel tilt angle = 15 . b Vn is the net volume in litres of the measuring enclosure Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 07/16/200
23、7 01:22:21 MDTNo reproduction or networking permitted without license from IHS -,-,- 4 60268-5 Amend. 1 IEC:2007(E) Add, after Annex C, the following new Annex D: Annex D (informative) Listening tests D.1 Listening test for normal operation Confirm normal operation by applying a programme signal to
24、the loudspeaker to be tested. a) Install the loudspeaker as described in Clause 10. b) Apply the programme signal with maximum r.m.s. voltage equal to the rated noise voltage of the loudspeaker. c) Check the sound level, tone quality, noise, and presence of other defects. NOTE 1 The programme signal
25、 is a speech or music signal of normal spectral distribution. NOTE 2 This test is conducted mainly during the manufacturing process and reporting of the result is not required. D.2 Listening test for mechanical noise (rattles) This test checks for rub and buzz by listening to ascertain that the loud
26、speaker works normally when applying the rated sinusoidal voltage to the loudspeaker terminals. a) Mount the loudspeaker as specified in Clause 10. b) Check the sound of the loudspeaker by applying the rated sinusoidal voltage to the loudspeaker, changing the frequency of the sinusoidal signal, with
27、in the rated frequency range. The measuring voltage may be set freely by the manufacturer if necessary. c) The listening position should be a position where any abnormal sound is easily heard, at a distance of more than 0,3 m from the reference point of the loudspeaker, unless otherwise stated. d) C
28、heck the sound level, sound quality, noise level and the existence of other abnormal sound e) The power amplifier should have an output impedance smaller than one-third of the rated impedance of the loudspeaker and be able to provide a sinusoidal voltage at least twice the rated sinusoidal voltage o
29、f the loudspeaker. The total harmonic distortion shall not exceed 1 % at the loudspeaker terminals. NOTE This test is conducted mainly during the manufacturing process and reporting of the result is not required. _ Copyright International Electrotechnical Commission Provided by IHS under license wit
30、h IECLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 07/16/2007 01:22:21 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=Wi
31、ng, Bernie Not for Resale, 07/16/2007 01:22:21 MDTNo reproduction or networking permitted without license from IHS -,-,- ISBN 2-8318-9210-4 -:HSMINB=WVU: ICS 33.160.50 Typeset and printed by the IEC Central Office GENEVA, SWITZERLAND Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 07/16/2007 01:22:21 MDTNo reproduction or networking permitted without license from IHS -,-,-