BS 6840-6-1987 Sound system equipment - Methods for specifying and measuring the characteristics of auxiliary passive elements《音响系统设备 第6部分 辅助无源元件特性的规定和测量方法》.pdf
《BS 6840-6-1987 Sound system equipment - Methods for specifying and measuring the characteristics of auxiliary passive elements《音响系统设备 第6部分 辅助无源元件特性的规定和测量方法》.pdf》由会员分享,可在线阅读,更多相关《BS 6840-6-1987 Sound system equipment - Methods for specifying and measuring the characteristics of auxiliary passive elements《音响系统设备 第6部分 辅助无源元件特性的规定和测量方法》.pdf(32页珍藏版)》请在麦多课文档分享上搜索。
1、BRITISH STANDARD BS 6840-6: 1987 IEC 268-6: 1971 Sound system equipment Part 6: Methods for specifying and measuring the characteristics of auxiliary passive elements IEC title: Sound system equipment. Part 6: Auxiliary passive elements UDC 621.396+681.84:621.395.61:621.317.6BS6840-6:1987 This Briti
2、sh Standard, having been prepared under the direction of the Electronic Equipment Standards Committee, was published under the authority of the Board of BSI and comes into effect on 30 November 1987 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference EEL
3、/32 Draft for comment 73/23761 DC ISBN 0 580 16223 0 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Electronic Equipment Standards Committee (EEL/-) to Technical Committee EEL/32, upon which the following bodies were represented: Associ
4、ation of British Theatre Technicians Association of Sound and Communications Engineers Limited Audio Engineering Society British Educational Equipment Association British Kinematograph, Sound and Television Society British Radio and Electronic Equipment Manufacturers Association British Telecommunic
5、ations plc Cable Television Association of Great Britain Consumer Standards Advisory Committee of BSI Consumers Association Federation of British Audio Independent Television Companies Association Institution of Electronic and Radio Engineers Radio Electrical and Television Retailers Association Roy
6、al Institute of British Architects Royal National Institute for the Deaf Society of Cable Television Engineers Training and Educational Systems Testing Bureau Amendments issued since publication Amd. No. Date of issue CommentsBS6840-6:1987 BSI 07-1999 i Contents Page Committees responsible Inside fr
7、ont cover National foreword iii 1 Scope 1 2 Object 1 Chapter I: Conditions for specification and measurement 3 General conditions 1 4 Rated conditions and normal working conditions 1 Chapter II: Characteristics to be specified and the relevant measuring methods Section 1. Auxiliary passive elements
8、5 Diagram 2 5.1 Structure diagram (block schematic) 2 6 Terminals and controls 2 6.1 Marking 2 6.2 Symbols for marking 2 7 Input characteristics 3 7.1 Rated source impedance 3 7.2 Input impedance 3 7.3 Rated source e.m.f. 4 8 Output characteristics 4 8.1 Rated load impedance 4 8.2 Output impedance 4
9、 9 Limiting characteristics 4 9.1 Overload source e.m.f. 4 9.2 Temperature limited input voltage 5 10 Attenuation 5 10.1 Rated matched insertion loss 5 10.2 Voltage attenuation (insertion attenuation) 5 11 Response 6 11.1 Frequency response 6 11.2 Effective frequency range 6 11.3 Phase-frequency res
10、ponse 6 12 Amplitude non-linearity 7 12.1 Harmonic distortion 7 12.2 Distortion curves 8 13 Unbalance 8 13.1 Unbalance of the input 8 13.2 Unbalance of the output 9 14 External influences 11 14.1 General 11 14.2 Rated equivalent source e.m.f. for external magnetic fields of power supply frequency 11
11、 14.3 Residual equivalent source e.m.f. for external magnetic fields of power supply frequency 11 15 Magnetic stray field 12 15.1 Magnetic stray field generated by the passive element 12 16 Alignment 12 16.1 Attenuation alignment 12BS6840-6:1987 ii BSI 07-1999 Page 16.2 Phase alignment 13 Section 2.
12、 Widely used passive elements 17 Attenuators 13 17.1 Residual attenuation 13 17.2 Attenuation range 13 17.3 Attenuation steps 14 17.4 Ultimate attenuation 14 18 Transformers 14 18.1 Impedance ratio 14 18.2 Voltage ratio 14 18.3 Rated output power 14 18.4 Limiting direct current 15 19 Filters and equ
13、alizers 15 19.1 Reference frequency response 15 19.2 Tone control range 15 Section 3. Physical characteristics and cable assemblies 20 Dimensions 15 21 Weight 15 22 Cable assemblies 15 Section 4. Classification of the characteristics to be specified 23 General 15 24 Classification 16 Appendix A 18 F
14、igure 1 Input impedance, balanced input, free from earth 18 Figure 2 Input impedance, balanced input, free from earth 18 Figure 3 Input impedance, balanced input, connected to earth 19 Figure 4 Input impedance, balanced input, connected to earth 19 Figure 5 Input impedance, unbalanced input 19 Figur
15、e 6 Input impedance, unbalanced input 20 Figure 7 Unbalance of the input 20 Figure 8a Unbalance of the internal impedance 21 Figure 8b Unbalance of the output e.m.f. 21 Figure 8c Internal impedance of the source of unbalance 22 Figure 9 Arrangement of three coils for the production of a uniform alte
16、rnating magnetic field 23 Figure 10 Search coil for measuring the magnetic field strength 24 Publications referred to Inside back coverBS6840-6:1987 BSI 07-1999 iii National foreword This British Standard has been prepared under the direction of the Electronic Equipment Standards Committee and is id
17、entical with Publication268.6:1973 “Sound system equipment” Part 6 “Auxiliary passive elements” published by the International Electrotechnical Commission (IEC). The text of this Part of BS6840 is unchanged from the text of BS5428-4:1978 which is now withdrawn. All Parts and Sections of BS5428 will
18、be published as Parts of BS6840 in order to achieve consistency of numbering between the corresponding Parts of the IEC Publication and the British Standard. BS6840 consists of the following parts: Part 1: Methods for specifying and measuring general characteristics used for equipment performance (S
19、upersedes part of BS5428-1); Part 2: Specification for general terms and calculation methods (Supersedes part of BS5428-1) 1) ; Part 3: Methods for specifying and measuring the characteristics of sound system amplifiers (Supersedes BS5428-2) 1) ; Part 4: Methods for specifying and measuring the char
20、acteristics of microphones (Previously BS5428-3); Part 5: Methods for specifying and measuring the characteristics of loudspeakers (Supersedes BS5428-11 and BS 5428-11: Supplement 1) 1) ; Part 6: Methods for specifying and measuring the characteristics of auxiliary passive elements (Previously BS542
21、8-4); Part 7: Methods for specifying and measuring the characteristics of headphones and headsets (New) 1) ; Part 8: Methods for specifying and measuring the characteristics of automatic gain control devices (Previously BS5428-7); Part 9: Methods for specifying and measuring the characteristics of a
22、rtificial reverberation, time delay and frequency shift equipment (Previously BS5428-8); Part 10: Specification for programme level meters (Supersedes BS5428-9); Part 11: Specification for application of connectors for the interconnection of sound system components (Supersedes BS5428-5.2) 1) ; Part
23、12: Specification for application of connectors for broadcast and similar use (Supersedes BS5428-5.3) 1) ; Part 13: Guide for listening tests on loudspeakers (New); Part 14: Guide for circular and elliptical loudspeakers: outer frame diameters and mounting dimensions (Previously BS5428-5.1); Part 15
24、: Specification for matching values for the interconnection of sound system components (Supersedes BS5428-10) 1) ; Part 16: Guide to the RASTI method for the objective rating of speech intelligibility in auditoria (New) 1) . Terminology and conventions. The text of the international standard has bee
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