1、BRITISH STANDARD BS5942-3: 1980 IEC581-3: 1979 High fidelity audio equipment and systems; minimum performance requirements Part 3: Specification for record playing equipment and cartridges UDC 681.84.086.004.15:681.844BS5942-3:1980 This British Standard, having been prepared under the directionof th
2、e Electronic Equipment Standards Committee,was published underthe authority of the Executive Boardand comes intoeffect on 30September1980 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference EEL/24 Draft for comment71/25595DC ISBN 0 580 11500 3 Cooperatin
3、g organizations The Electronic Equipment Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following Government department and scientific and industrial organizations: British Broadcasting Corporation* British Electrical and Allied Ma
4、nufacturers Association (BEAMA) British Radio Equipment Manufacturers Association* Cable and Wireless Limited Cable Television Association of Great Britain Electrical, Electronic, Telecommunications and Plumbing Union Electricity Supply Industry in England and Wales Electronic Components Industry Fe
5、deration* Electronic Engineering Association Institution of Electronic and Radio Engineers* Ministry of Defence Post Office* Post Office Engineering Union Scientific Instrument Manufacturers Association* The organizations marked with an asterisk in the above list, together with the following, were d
6、irectly represented on the committee entrusted with the preparation of this British Standard: Association of Professional Recording Studios Limited Association of Sound and Communications Engineers Limited Audio Engineering Society British Kinematograph, Sound and Television Society Consumers Associ
7、ation European Tape Industry Association Federation of British Audio Independent Television Companies Association Radio Electrical and Television Retailers Association Royal Institute of British Architects Royal National Institute for the Deaf Telecommunication Engineering and Manufacturing Associat
8、ion (TEMA) Amendments issued since publication Amd. No. Date of issue CommentsBS5942-3:1980 BSI 10-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii 1 Scope 1 2 Object 1 3 Measuring conditions 1 Section 1. Minimum requirements for characteristics directly related
9、 tothereproducing quality 1 Section 2. Other characteristics and requirements 3 Publications referred to Inside back coverBS5942-3:1980 ii BSI 10-1999 National foreword This British Standard, published under the direction of the Electronic Equipment Standards Committee, is identical with IEC publica
10、tion581-3 “High fidelity audio equipment and systems; minimum performance requirements Part3,Record playing equipment and cartidges”, published in1979 by the International Electrotechnical Commission (IEC). Terminology and conventions. The text of the International Standard hasbeen approved as suita
11、ble for publication, without deviation, as a BritishStandard. Some terminology and certain conventions are not identical with those used in British Standards. The technical committee has reviewed the provisions of IEC98:1964 and IEC268-14A and has decided that they are acceptable for use in conjunct
12、ion with this standard. The British Standard related to IEC98 is BS1928 “Processed disk records and reproducing equipment”. 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
13、with a British Standard does not of itself confer immunity from legal obligations. Cross-references International Standard Corresponding British Standard IEC98A:1972 BS4852 Methods of defining and measuring the characteristics of disk record playing equipment Part1:1972 Disk record players (Technica
14、lly equivalent) IEC268-15:1978 BS5428 Methods for specifying and measuring the characteristics of sound system equipment Part10:1979 Preferred matching values for the interconnection of sound system components (Identical) IEC386:1972 BS4847:1972 Method of measurement of speed fluctuation in sound re
15、cording and reproducing equipment (Technically equivalent) IEC581-1:1977 BS5942 High fidelity audio equipment and systems; minimum performance requirements Part1:1980 Specification for general requirements (Identical) Summary of pages This document comprises a front cover, an inside front cover, pag
16、esi andii, pages1 to4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS5942-3:1980 BSI 10-1999 1 1 Scope This part applies to disk record pla
17、ying units, comprising the drive system for the record and the reproducing pick-up system, and primarily intended for high quality reproducing systems for home use. 2 Object To lay down the minimum requirements for disk record playing units falling within the scope of this part. 3 Measuring conditio
18、ns All measurements shall be made in accordance with the general measuring conditions stated in IEC Publication581-1-1: General, and with the conditions of measurement given in Clause4 of IEC Publication98A, First Supplement to Publication98(1964), Processed Disk Records and Reproducing Equipment. M
19、ethods of Measuring the Characteristics of Disk Record Playing Units. The temperature range of15 C to25 C, specified in IEC Publication98A shall take precedence over that of IEC Publication581-1. NOTEIn this standard reference is made to IEC Publication98A(1972) and its Amendment No.1 (in preparatio
20、n). Section 1. Minimum requirements for characteristics directly related to the reproducing quality Clause Characteristic Method of measurement Minimum requirement 4 Mean deviation from rated speed According to IEC Publication98A, Sub-clause 5.2.1: Mean deviation from rated speed +1.5% to 1% at any
21、power supply voltage within the range 10% of the rated power supply voltage 5 Weighted wow and flutter According to IEC Publication98A, Sub-clause 5.2.2: Wow and flutter: NOTE 1Though the meter measures peak-to-peak values, the reading indicates the wow as a percentage of the figure corresponding to
22、 one half the peak-to-peak value. NOTE 2The weighting network used is specified inIEC Publication386, Figure1. 0.2%maximum 6 Unweighted reference signal-to-rumble ratio According to IEC Publication98A, Sub-clause 5.3: Unweighted reference signal-to-rumble ratio as follows: where: U o =voltage derive
23、d from the reference signal U =voltage derived from the low frequency vibration T 35dB Reference velocity3.83cm/s r.m.s. Reference frequency315Hz 7 Weighted reference signal-to-rumble ratio According to IEC Publication98A, Sub-clause 5.3: Weighted reference signal-to-rumble ratio where: U o =voltage
24、 derived from the reference signal U =voltage derived from the low frequency vibration NOTEThe weighting network used is specified in IEC Publication98A, Appendix B. T 55dB Reference velocity3.83cm/s r.m.s. Reference frequency315Hz 20 log U o U - dB 20 log U o U - dBBS5942-3:1980 2 BSI 10-1999 Claus
25、e Characteristic Method of measurement Minimum requirement 8 Reference signal-to-hum ratio According to IEC Publication98A, Sub-clause 5.4: Reference signal-to-hum ratio as follows: where: U o =voltage derived from the reference signal U=maximum voltage derived from the stray fields T 50dB Reference
26、 velocity3.83cm/s r.m.s. Reference frequency315Hz 9 Channel unbalance According to IEC Publication98A, Sub-clause 5.6: Channel unbalance as follows: where: U L =left output voltage derived from left1000Hz signal U R =right output voltage derived from identical right1000Hz signal r 2dB 10 Channel sep
27、aration According to IEC Publication98A, Sub-clause 5.7: Minimum separation as follows: Separation of Channel L from Channel R: Separation of Channel R from Channel L: where: (U L ) L =output voltage of Channel L (U L ) R =output voltage of Channel L due to input voltage applied to Channel R (U R )
28、R =output voltage or Channel R (U R ) L =output voltage of Channel R due to input voltage applied to Channel L NOTESeparation and crosstalk are equivalent only if (U L ) L =(U R ) R . T 20dB at1000Hz T 15dB between315Hz and6300Hz NOTEThe requirements for multi-channel equipment are under considerati
29、on. 11 Effective frequency range According to IEC Publication98A, Sub-clause 5.8.1: Signal characteristics If the claimed effective frequency range is wider than the minimum requirement of40Hz and12500Hz the tolerance of5dB still applies From40Hz to12500Hz within the tolerances defined by the graph:
30、 f 1 f 2 f 3 f 4 = = = = 40Hz 63Hz 8000Hz 12500Hz 20 log U o U - dB 20 log U R U L - dB 20 log (U L ) L (U L ) R - dB 20 log (U R ) R (U R ) L - dBBS5942-3:1980 BSI 10-1999 3 Section 2. Other characteristics and requirements Clause Characteristic Method of measurement Minimum requirement 12 Amplitud
31、e non-linearity Under consideration for inclusion in IECPublication98A Under consideration 13 Tracking ability According to IEC Publication98A, Sub-clause 5.9: Tracking ability NOTEThe test record mentioned in IEC Publication98A is not considered suitable for the test. An improved test record is und
32、er consideration. Under consideration Clause Characteristic Method of measurement Minimum requirement 14 Rated output voltage According to IEC Publication98A, Sub-clause 5.5: Channel sensitivity at1000Hz, as follows: where: U is the output voltage at velocity v U and v are both either r.m.s, or peak
33、 values Velocity sensitivity pick-ups:0.7 to2.0mV/cm/s. NOTEFor electrodynamic pick-ups it will be necessary to provide built-in amplification. 15 Vertical tracking angle 20 5 16 Static vertical stylus force Maximum0.03N 17 Stylus tip radius According to IEC Publication98, Sub-clause E.1: Reproducin
34、g stylus Spherical:15 4m Non-spherical: under consideration 18 Interconnection a) mechanical b) electrical According to IEC Publication268-14A According to IEC Publication268-15 19 Characteristics to be specified The characteristics listed in this standard are mandatory in the manufacturers manual o
35、r descriptive leaflet and technical specifications. In addition, details of terminals, controls, speeds and power supply shall be given U v -mV per cm/s +3 04 blankBS5942-3:1980 BSI 10-1999 Publications referred to See national forewordBS5942-3: 1980 IEC581-3: 1979 BSI 389 Chiswick High Road London
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