1、BRITISH STANDARD BS EN 61305-3:1995 IEC 1305-3: 1995 Household high-fidelity audio equipment and systems Methods of measuring and specifying the performance Part 3: Amplifiers The European Standard EN 61305-3:1995 has the status of a British StandardBSEN61305-3:1995 This British Standard, having bee
2、n prepared under the directionof the ElectrotechnicalSector Board,was published undertheauthority of the StandardsBoard and comesintoeffect on 15 December 1995 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference EPL/84 Draft for comment 92/26953 DC ISBN
3、0 580 24972 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee EPL/84, Equipment and systems in the field of audio, video and audiovisual engineering, upon which the following bodies were represented: Association of Britis
4、h Theatre Techniques Audio Engineering Society British Broadcasting Corporation British Educational Supplies Association British Fire Protection Systems Association Limited British Kinematograph, Sound and Television Society British Radio and Electronic Equipment Manufacturers Association British Te
5、lecommunications plc Consumers Association Federation of British Audio Federation of the Electronics Industry Independent Television Association Institution of Electrical Engineers International Association of Broadcasting Manufacturers National Council for Educational Technology (NCET) Professional
6、 Lighting and Sound Association Radio Electrical and Television Retailers Association Royal Institute of British Architects Royal National Institute for Deaf People Society of Cable Television Engineers Amendments issued since publication Amd. No. Date CommentsBSEN61305-3:1995 BSI 09-1999 i Contents
7、 Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN 61305-3 3 List of references Inside back coverBSEN61305-3:1995 ii BSI 09-1999 National foreword This British Standard has been prepared by Technical Committee EPL/84 and is the English language version of EN61
8、305-3:1995 Household high-fidelity audio equipment and systems Methods of measuring and specifying the performancePart 3: Amplifiers, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC1305-3:1995, published by the International Electrotechnic
9、al Commission (IEC). EN 61305 consists of the following Parts: Part 1: General; Part 2: FM radio tuners 1) ; Part 3: Amplifiers. 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. Compli
10、ance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 6, an inside back cover and a back cover. This standard has been updated (see copyright
11、 date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1) In preparation. Cross-references Publication referred to Corresponding British Standard BS 6840 Sound system equipment HD 483.1 S2:1989 (IEC 268-1:1985) Part 1:1987 Methods fo
12、r specifying and measuring general characteristics used for equipment performance HD 483.3 S2:1992 (IEC 268-3:1988) Part 3:1992 Methods for specifying and measuring the characteristics of sound system amplifiers EN 60958:1990 (IEC 958:1989) BS EN 60958:1995 Specification for digital audio interface
13、EN 61305-1:1995 (IEC 1305-1:1995) BS EN 61305 Household high-fidelity audio equipment and systems Methods of measuring and specifying the performance Part 1:1995 General a a The footnote to clause1 is no longer applicable.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61305-3 July 1995 ICS 33.
14、160.10 Descriptors: Electroacoustic equipment, high fidelity systems, audio amplifiers, characteristics, measurements, testing conditions English version Household high-fidelity audio equipment and systems Methods of measuring and specifying the performance Part 3: Amplifiers (IEC1305-3:1995) Equipe
15、ments et systmes audio grand public haute fidlit Mthodes pour mesurer et spcifier les performances Partie 3: Amplificateurs (CEI 1305-3:1995) Hifi-Gerte und Anlagen fr den Heimgebrauch Verfahren zur Messung und Angabe der Leistungskennwerte Teil 3: Verstrker (IEC 1305-3:1995) This European Standard
16、was approved by CENELEC on 1995-07-04. CENELEC members are bound to 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 s
17、uch national standards may be obtained on application to the Central 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
18、 language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Swed
19、en, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1995 Copyright reserved to CENELEC members Ref
20、. No. EN 61305-3:1995 EEN61305-3:1995 BSI 09-1999 2 Foreword The text of document 84/397/DIS, future edition 1 of IEC1305-3, prepared by IECTC84, Equipment and systems in the field of audio, video and audiovisual engineering, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC
21、 as EN61305-3 on1995-07-04. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. In this standard, Annex ZA is normative. Annex ZA has been added by CENELEC. Contents Page Foreword 2 1 General 3 1.1 Scope 3 1.2 Normative references 3 2 Conditions for m
22、easurements 3 3 Methods of measurement 3 4 Contents of specifications 5 Annex ZA (normative) Normative references to international publications with their corresponding European publications 6 latest date by which the EN has to be implemented at national level by publication of an identical national
23、 standard or by endorsement (dop) 1996-04-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 1996-04-01EN61305-3:1995 BSI 09-1999 3 1 General 1.1 Scope This part of IEC 1305 applies to household high-fidelity audio amplifiers of all types. It also appli
24、es, except where stated, to equipment having multiple functions, including audio amplifying functions. It is intended to be read in conjunction with IEC 1305-1 2) . 1.2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisi
25、ons of this part of IEC1305. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC1305 are encouraged to investigate the possibility of applying the most recent editions of the normative doc
26、uments indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 268-1:1985, Sound system equipment Part 1: General. IEC 268-3:1988, Sound system equipment Part 3: Amplifiers. Amendment No. 1 (1990) IEC 268-15:1995, Sound system equipment Part 15: Pre
27、ferred matching values for the interconnection of sound system components (being printed). IEC 958:1989, Digital audio interface. IEC 1305-1, Household high-fidelity audio equipment and systems Method of measuring and specifying the performance Part 1: General 2) . 2 Conditions for measurements 2.1
28、Electrical conditions The electrical conditions shall be those specified in IEC268-3, clauses3, 5 and8 to12. Source e.m.f. values and impedances shall be taken from IEC268-15 for analogue inputs and IEC958 for digital inputs, unless otherwise specified by the manufacturer. 2.2 Climatic conditions Se
29、e2.2 of the future IEC1305-1. 3 Methods of measurement 2) At present at the stage of Draft International Standard. Characteristics to be specified Methods of measurement 3.1 Effective frequency range According to IEC 268-3, 21.2.2. The response limits shall be: for linear (non-equalizing) inputs, 1,
30、5 dB; for equalizing inputs, 2 dB. 3.2 Gain difference between channels According to IEC 268-3, 29.1. The highest value between 250 Hz and 6,3 kHz, foranypositionof the volume control from maximumtothat giving46dB attenuation shall begiven. Any balance controlshall be set at the mechanical centre po
31、sition.EN61305-3:1995 4 BSI 09-1999 3.3 Total harmonic distortion According to IEC 268-3, 22.4. The most unfavourable value, at any frequency from63Hz to12,5kHz, at any level from 1 dB belowthe rated (distortion-limited) output power orvoltage, to 30 dB or 50 mW, whichever is lower,shall be given. 3
32、.4 Distortion-limited effective frequency range According to IEC 268-3, 21.3. The frequencies shall be given at which the outputpower or voltage giving a stated value of totalharmonic distortion is 3 dB below the rated (distortion-limited) output power or voltage. For multi-channel equipment, where
33、the channels have similar effective frequency ranges and rated output voltages, all channels shall be driven so as to produce approximately the same output. Where the channels differ in characteristics, they shall be driven, if necessary, with signals of different frequency, so as to produce approxi
34、mately the same output level relative to their rated output voltages or powers. 3.5 Rated (distortion-limited) output voltage orpower,measured after 600 s, at the rated valueoftotal harmonic distortion (i.e. that specifiedbythe manufacturer). According to IEC 268-3, 18.3. If the manufacturer specifi
35、es a sustaining time for rated output power or voltage less than 600 s, the measurement shall be made after that time. 3.6 Maximum output voltage and current According to IEC 268-3, amendment 1, 19.5. 3.7 Overload source e.m.f. According to IEC 268-3, 19.1. The values at which the rated total harmon
36、ic distortionis not exceeded shall be given. 3.8 Separation between stereo channels According to IEC 268-3, clause 28. The most unfavourable value measured over the frequency range 250 Hz to 6,3 kHz, and for any positionof the volume control from maximum to thatgiving 46 dB attenuation, shall be giv
37、en. 3.9 Cross-talk between unrelated channels According to IEC 268-3, clause 28. The measurements shall be made at frequenciesbetween 1 kHz and 10 kHz. Themostunfavourable values, specified as in3.8,shallbe given for each pair of unrelated inputs,andbetween each input and any low-level outputs(such
38、as those for recording). 3.10 Unweighted (band-limited) signal-to-noise ratioexpressed in decibels According to IEC 268-3, clause 23, using the wide-band filter specified in 6.1 of IEC 268-1 and the true r.m.s. meter specified in 6.2.1 of IEC 268-1. Thecontrols shall be set to give the widest possib
39、le flat frequency response. For amplifiers without volume control, the reference(0dB) level shall be the rated output voltageor power. For amplifiers with volume controls,measurements shall be made with the volumecontrol in the position for rated conditions (see IEC 268-3 3.2.2 and clause 10), and i
40、n the positiongiving a further 30 dB of attenuation. The reference level for the result of the latter measurementis 30 dB below the rated output voltage or power. The more unfavourable value shall be given.EN61305-3:1995 BSI 09-1999 5 4 Contents of specifications 4.1 Comprehensive specifications Com
41、prehensive specifications shall contain, at least, information on the characteristics given in3.1, 3.3, 3.5, 3.8, 3.9 and3.11. 3.11 A-weighted signal-to-noise ratio, expressedindecibels As for 3.10, but using the A-weighting filter and true r.m.s. meter specified in IEC 268-1, 6.2.1. The procedures
42、specified in 3.10 shall be used. 3.12 Distortion and noise of digital inputs According to 4.12 of document 84(Secretariat)303 a , the three signal levels FS, FS-30 dB and FS-60 dB shall be used. a Basic methods of measurement of the audio characteristics of digital audio and the digital audio part o
43、f audiovisual equipment (future IEC 1606) (under consideration).EN61305-3:1995 6 BSI 09-1999 Annex ZA (normative) Normative references to international publications with their corresponding European publications This European Standard incorporates by dated or undated reference, provisions from other
44、 publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or r
45、evision. For undated references the latest edition of the publication referred to applies. NOTEWhen the international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 268-1 1985 Sound systems equipment Part 1
46、: General HD 483.1 S2 a 1989 IEC 268-3 1988 Part 3: Amplifiers HD 483.3 S2 b 1992 + A1 1990 IEC 268-15 1995 c Part 15: Preferred matching values for the interconnection of sound system components IEC 958 1989 Digital audio interface EN 60958 1990 IEC 1305-1 1995 Household high-fidelity audio equipme
47、nt and systems Methods of measuring and specifying the performance Part 1: General EN 61305-1 1995 a HD 483.1 S2 includes A1:1988 to IEC 268-1. b HD 483.3 S2 also includes A2:1991 to IEC 268-3. c IEC 268-15:1987 + A1:1989 + A2:1990 + A3:1991 is harmonized as HD 483.15 S4:1992.BSEN61305-3:1995 BSI 09
48、-1999 List of references See national foreword.BS EN 61305-3:1995 IEC 1305-3: 1995 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the intern
49、ational level. It is incorporated by Royal Charter. Revisions BritishStandards are updated by amendment or revision. Users of BritishStandards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this BritishStandard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front co
