1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationElectroacoustics Audio-frequency induction loop systems for assisted hearingPart 1: Methods of measuring and specifying the performance of system componentsBS EN 62489-1:2010Lice
2、nsed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 01/09/2010 08:16, Uncontrolled Copy, (c) BSINational forewordThis British Standard is the UK implementation of EN 62489-1:2010. It isidentical to IEC 62489-1:2010.The UK participation in its preparation was entrusted to Technical CommitteeEPL/29, El
3、ectroacoustics.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. BSI 2010ISBN 978 0 580 61371 5ICS 17.140.50Compli
4、ance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of the StandardsPolicy and Strategy Committee on 31 May 2010.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 62489-1:2010Licensed Copy
5、: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 01/09/2010 08:16, Uncontrolled Copy, (c) BSIEUROPEAN STANDARD EN 62489-1 NORME EUROPENNE EUROPISCHE NORM April 2010 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektro
6、technische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 62489-1:2010 E ICS 17.140.50 English version Electroacoustics - Audio-frequency induction loop systems
7、for assisted hearing - Part 1: Methods of measuring and specifying the performance of system components (IEC 62489-1:2010) Electroacoustique - Systmes de boucles dinduction audiofrquences pour amliorer laudition - Partie 1: Mthodes de mesure et de spcification des performances des composants de syst
8、mes (CEI 62489-1:2010) Akustik Audiofrequenz-Induktionsschleifenanlagen zur Untersttzung von Hrsystemen Teil 1: Verfahren zur Messung und Angabe des Betriebsverhaltens der Systemkomponenten (IEC 62489-1:2010) This European Standard was approved by CENELEC on 2010-04-01. CENELEC members are bound to
9、comply with the CEN/CENELEC Internal 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 Central
10、 Secretariat or to any CENELEC member. 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 CENELEC member into its own language and notified to the Central Secretariat has the same statu
11、s as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, No
12、rway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 62489-1:2010Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 01/09/2010 08:16, Uncontrolled Copy, (c) BSIEN 62489-1:2010 - 2 - Foreword The text of document 29/667/CDV, future edition
13、1 of IEC 62489-1, prepared by IEC TC 29, Electroacoustics, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 62489-1 on 2010-04-01. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and CENELEC sha
14、ll not be held responsible for identifying any or all such patent rights. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2011-01-01 latest date by which the national standard
15、s conflicting with the EN have to be withdrawn (dow) 2013-04-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 64289-1:2010 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the fol
16、lowing note has to be added for the standards indicated: 1 IEC 60065 NOTE Harmonized as EN 60065. _ BS EN 62489-1:2010Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 01/09/2010 08:16, Uncontrolled Copy, (c) BSI- 3 - EN 62489-1:2010 Annex ZA (normative) Normative references to international pu
17、blications with their corresponding European publications 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)
18、applies. NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60118-4 2006 Electroacoustics - Hearing aids - Part 4: Induction loop systems for hearing aid purposes - Magnetic field str
19、ength EN 60118-4 2006 IEC 60268-1 1985 Sound system equipment - Part 1: General HD 483.1 S2 1) 1989 IEC 60268-2 - Sound system equipment - Part 2: Explanation of general terms and calculation methods HD 483.2 S2 2) - IEC 60268-3 2000 Sound system equipment - Part 3: Amplifiers EN 60268-3 + corr. Jan
20、uary 2000 2002 IEC 60268-4 2004 Sound system equipment - Part 4: Microphones EN 60268-4 2004 IEC 61938 - Audio, video and audiovisual systems - Interconnections and matching values - Preferred matching values of analogue signals EN 61938 - ISO/IEC Guide 98-3 - Uncertainty of measurement - Part 3: Gu
21、ide to the expression of uncertainty in measurement (GUM:1995) - - 1) HD 483.1 S2 includes A1 to IEC 60268-1. 2) HD 483.2 S2 includes A1 to IEC 60268-2. BS EN 62489-1:2010Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 01/09/2010 08:16, Uncontrolled Copy, (c) BSI 2 62489-1 IEC:2010 CONTENTS 1
22、 Scope.6 2 Normative references .6 3 Terms and definitions .7 4 Rated values 7 5 Amplifiers .7 5.1 General .7 5.2 Rated conditions and standard measuring conditions 7 5.2.1 Rated conditions7 5.2.2 Standard measurement conditions.8 5.3 Pre-conditioning 8 5.4 Characteristics to be specified, methods o
23、f measurement and presentation of results .8 5.4.1 Rated source impedance .9 5.4.2 Rated source e.m.f. .9 5.4.3 Rated load.9 5.4.4 Rated temperature-limited output current.9 5.4.5 Rated time for delivery of rated distortion-limited output current 10 5.4.6 Rated total harmonic distortion of the outpu
24、t current10 5.4.7 Maximum (distortion-limited) output current .10 5.4.8 Compliance voltage .10 5.4.9 Noise.11 5.4.10 Magnetic field strength 12 5.4.11 Loop dimensions .13 5.4.12 Frequency response 13 5.4.13 Automatic gain control and compression13 5.4.14 Phase error of quadrature networks for phased
25、 loop arrays .14 5.4.15 Installation.14 5.4.16 Physical characteristics .14 6 Microphones.14 6.1 General .14 6.2 Characteristics to be specified, methods of measurement and presentation of results .14 7 Other components 15 7.1 General .15 7.2 Characteristics to be specified, methods of measurement a
26、nd presentation of results .15 8 Measurement uncertainty .15 Annex A (informative) Automatic gain control and compression .16 Annex B (informative) Loop conductors and some typical impedance values17 Annex C (informative) Microphones .20 Bibliography21 Figure A.1 Typical steady-state output/input ch
27、aracteristics .16 BS EN 62489-1:2010Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 01/09/2010 08:16, Uncontrolled Copy, (c) BSI62489-1 IEC:2010 3 Table B.1 Typical loop characteristics18 Table B.2 Cable characteristics19 BS EN 62489-1:2010Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS
28、, 01/09/2010 08:16, Uncontrolled Copy, (c) BSI 6 62489-1 IEC:2010 ELECTROACOUSTICS AUDIO-FREQUENCY INDUCTION LOOP SYSTEMS FOR ASSISTED HEARING Part 1: Methods of measuring and specifying the performance of system components 1 Scope This part of the IEC 62489 series applies to the components of audio
29、-frequency induction-loop systems for assisted hearing. It may also be applied to such systems used for other purposes, as far as it is applicable. This standard is intended to encourage accurate and uniform presentation of manufacturers specifications, which can be verified by standardized methods
30、of measurement. It is intended for type testing. The components considered are the following: amplifiers; microphones; other components, such as playback equipment. This standard does not deal with safety, for which IEC 60065 applies. It also does not deal with EMC (Electromagnetic compatibility) an
31、d EMF (Electromagnetic fields, in the context of human exposure). 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 docum
32、ent (including any amendments) applies. IEC 60118-4:2006, Electroacoustics Hearing aids Part 4: Induction loop systems for hearing aid purposes Magnetic field strength IEC 60268-1:1985, Sound system equipment Part 1: General IEC 60268-2, Sound system equipment Part 2: Explanation of general terms an
33、d calculation methods IEC 60268-3:2000, Sound system equipment Part 3: Amplifiers IEC 60268-4:2004, Sound system equipment Part 4: Microphones IEC 61938, Audio, video and audiovisual systems Interconnections and matching values Preferred matching values of analogue signals ISO/IEC Guide 98-3, Uncert
34、ainty of measurement Part 3: Guide to the expression of uncertainty in measurement (GUM:1995 ) BS EN 62489-1:2010Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 01/09/2010 08:16, Uncontrolled Copy, (c) BSI62489-1 IEC:2010 7 3 Terms and definitions For the purposes of this document, the follow
35、ing definition applies. 3.1 useful magnetic field volume volume within which the system provides hearing-aid users with a signal of acceptable quality (see 6.7 of IEC 60118-4:2006) 4 Rated values The term “rated” means the value stated by the manufacturer. Rated values are of two kinds; rated condit
36、ions, fundamental values that can be determined only by the manufacturer, and others that can be measured. See 5.2.1. For a full explanation, see IEC 60268-2. 5 Amplifiers 5.1 General In most systems, the amplifier(s) accepts input from microphone(s) and delivers current to the induction loop(s). If
37、 there are separate preamplifier or mixer and final amplifier components, the methods described can be used with the interpretation that input signals are applied to the preamplifier or mixer and measurements of output characteristics are made at the output of the final amplifier. The characteristic
38、s to be specified are consistent with the lists in Annex C of IEC 60118-4:2006. NOTE For characteristics not mentioned in this standard, the provisions of IEC 60268-3 can be applied, with the provisions of 5.2 of this standard replacing those of 3.1 of IEC 60268-3:2000. 5.2 Rated conditions and stan
39、dard measuring conditions 5.2.1 Rated conditions The rated conditions for amplifiers are the following: rated power supply voltage; rated source impedance; rated source e.m.f. (electromotive force); rated load; rated temperature-limited output current; rated maximum time for delivery of rated distor
40、tion-limited output current (see below); rated total harmonic distortion of the output current; rated mechanical and climatic conditions. NOTE 1 Total harmonic distortion and (distortion-limited) output current are interdependent. Both cannot be taken as rated conditions simultaneously because norma
41、lly a given sample amplifier produces less than rated total harmonic distortion at rated output current. NOTE 2 If the power supply frequency is critical, it is also a rated condition. NOTE 3 The rated temperature-limited output current and the rated maximum time for delivery of rated distortion-lim
42、ited output current need not be included in published specifications, provided they are supplied on request. To obtain the correct conditions for measurements, the values for the above-mentioned rated conditions shall be taken from the manufacturers specification. These values themselves are BS EN 6
43、2489-1:2010Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 01/09/2010 08:16, Uncontrolled Copy, (c) BSI 8 62489-1 IEC:2010 not subject to verification, but they constitute the basis for measuring the other characteristics. Methods of measurement for these other characteristics are given in th
44、is standard and the manufacturer is required or permitted to state rated values for these characteristics in the specification of the equipment. These include rated maximum distortion limited output current; rated equivalent noise source e.m.f., or a measure of noise performance related to it. An am
45、plifier, considered as a four-terminal network with regard to a specified pair of input terminals and a specified pair of output terminals, shall be understood to be working under rated conditions when the following conditions are fulfilled: a) the amplifier is connected to its rated power supply; b
46、) the source e.m.f. is connected in series with the rated source impedance to the input terminals; c) the output terminals are terminated with the rated load; d) the terminals which are not used during the measurement are terminated, if necessary, as specified by the manufacturer; e) the source e.m.
47、f. is a sinusoidal voltage equal to the rated source e.m.f. at 1 000 Hz according to IEC 60268-1; f) the volume control, if any, is set to such a position that the rated distortion-limited output current appears at the output terminals; g) the tone controls, if any, are set to a specified position t
48、o give as flat a frequency response as possible; h) other controls, if any, are set to their normal positions as specified by the manufacturer; i) the climatic conditions given in Clause 8 of IEC 60268-1:1985 are complied with. Amplifiers for which the rated distortion-limited output current exceeds
49、 the rated temperature-limited output current are likely to be subject to unacceptable effects when operated under rated conditions for an extended period of time. For these amplifiers, rated conditions shall be maintained for no longer than can be tolerated by the amplifier. 5.2.2 Standard measurement conditions Standard measurement conditions are obtained by bringing the amplifier under rated conditions (see 5.2.1) and then reducing the o
