BS-6840-2-1993 IEC-60268-2-1987.pdf
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1、BRITISH STANDARD BS 6840-2: 1993 IEC 268-2: 1987 (including Amendment No. 1 May 1991 to IEC 268-2:1987) Sound system equipment Part 2: Glossary of general terms and calculation methods (Implementation of CENELEC HD 483.2 S2) UDC 534.86:621.39:001.4 Licensed Copy: sheffieldun sheffieldun, na, Tue Dec
2、 05 01:12:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6840-2:1993 This British Standard, having been prepared under the direction of the Electronic Equipment Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 November 1993 BSI 07-199
3、9 First published August 1988 Second edition November 1993 The following BSI references relate to the work on this standard: Committee reference EEL/32 Draft for comment 84/28116 DC and DC 89/21657 DC ISBN 0 580 22345 0 Committees responsible for this British Standard The preparation of this British
4、 Standard was entrusted by the Power Electrical Engineering Standards Policy Committee (EEL/-) to Technical Committee EEL/32, upon which the following bodies were represented: Association of British Theatre Technicians Association of Electronics, Telecommunications and Business Equipment Industries
5、Audio Engineering Society British Broadcasting Corporation British Educational Equipment Association British Kinematograph, Sound and Television Society British Radio and Electronic Equipment Manufacturers Association British Telecommunications plc Consumers Association Electronic Components Industr
6、y Federation Federation of British Audio Independent Television Association Institution of Electrical Engineers International Association of Broadcasting Manufacturers National Council for Educational Technology (NCET) Professional Lighting and Sound Association Radio Electrical and Television Retai
7、lers Association Royal Institute of British Architects Royal National Institute for Deaf People Society of Cable Television Engineers Sound and Communication Industries Federation Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:12:33
8、 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6840-2:1993 BSI 07-1999i Contents Page Committees responsibleInside front cover National forewordii Foreword2 1General terms3 1.1Sound system3 1.2Compatibility3 1.3Variable consumption apparatus3 1.4Noise signal3 1.5Rated values3 2Power4 2.1Relative pow
9、er level4 2.2Power level4 2.3Available power from the source4 2.4Available power gain4 3Voltage4 3.1Relative voltage level4 3.2Voltage level4 3.3Voltage gain5 3.4E.M.F. gain (overall voltage gain)5 4Source e.m.f.5 4.1Equivalent source e.m.f5 5Balance5 5.1Balanced circuits5 5.2Balanced inputs5 5.3Bal
10、anced outputs5 6Noise6 6.1Noise voltage6 6.2Signal-to-noise ratio6 6.3Equivalent noise source e.m.f.6 7Amplitude non-linearity6 7.1Introduction6 7.2Explanation of terms6 7.3Elucidation7 8Cross-talk and separation in multi-channel equipment8 8.1General8 8.2Cross-talk attenuation (from A to B)8 8.3Sep
11、aration (of A from B)8 9Acoustic characteristics8 9.1Sound pressure level8 9.2Sound power level8 9.3Equivalent input sound pressure of a microphone8 10Polarity8 10.1 Characteristics to be specified9 10.2 Method of measurement9 Annex ZA (normative) Other international publications quoted in this stan
12、dard with the references of the relevant European publications13 National annex NA (informative) Cross-referencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:12:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6840-2:1993 ii BSI 07-1999 Page Figure 1 Balance of the inp
13、ut9 Figure 2 Balance of the output10 Figure 3 Distortion spectra11 Figure 3a Harmonic distortion11 Figure 3b Modulation distortion11 Figure 3c Difference-frequency distortion12 Figure 3d Total difference-frequency distortion12 Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:12:33 GMT+00:00
14、 2006, Uncontrolled Copy, (c) BSI BS 6840-2:1993 BSI 07-1999iii National foreword This Part of BS 6840 has been prepared under the direction of the Electronic Equipment Standards Policy Committee. It is identical with IEC 268-2:1987 Sound system equipment Part 2: Explanation of general terms and cal
15、culation methods, as amended by Amendment No. 1 (May 1991), published by the International Electrotechnical Commission (IEC). This British Standard implements Harmonization Document HD 483.2 S2:1993, published by the European Committee for Electrotechnical Standardization (CENELEC). This British Sta
16、ndard supersedes BS 6840-2:1988 which is withdrawn. This edition introduces technical changes to bring this standard up-to-date but does not reflect a full review of the standard, which will be undertaken in due course. The changes introduced by the IEC Amendment No. 1 are indicated by a sideline in
17、 the margin. BS 6840 consists of the following Parts: Part 1: Methods for specifying and measuring general characteristics used for equipment performance; Part 2: Glossary of general terms and calculation methods; Part 3: Methods for specifying and measuring the characteristics of sound system ampli
18、fiers; Part 4: Methods for specifying and measuring the characteristics of microphones; Part 5: Methods for specifying and measuring the characteristics of loudspeakers; Part 6: Methods for specifying and measuring the characteristics of auxiliary passive elements; Part 7: Methods for specifying and
19、 measuring the characteristics of headphones and earphones1); Part 8: Methods for specifying and measuring the characteristics of automatic gain control devices; Part 9: Methods for specifying and measuring the characteristics of artificial reverberation time delay and frequency shift equipment; Par
20、t 10: Methods for specifying and measuring the characteristics of peak programme level meters; Part 11: Specification for application of connectors for the interconnection of sound system components; Part 12: Specification for applications of connectors for broadcast and similar use; Part 13: Guide
21、for listening tests on loudspeakers; Part 14: Guide for circular and elliptical loudspeakers; outer frame diameters and mounting dimensions; Part 15: Specification for matching values for the interconnection of sound system components; Part 16: Guide to the “RASTI” method for the objective rating of
22、 speech intelligibility in auditoria; Part 17: Methods for specifying and measuring the characteristics of standard volume indicators. 1) In preparation. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:12:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6840-2:1993 iv BSI 07-1999 Additiona
23、l information Scope. IEC 268-2 does not give the scope of the standard, which for the purposes of this British Standard is as follows: “This Part of BS 6840 specifies general terms and calculation methods for sound system equipment”. References to page numbers in the text relate to the IEC page numb
24、ers given in brackets at the bottom of each page. 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. Compliance with a British Standard does not of itself confer immunity from legal obli
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