1、BRITISH STANDARD BS6840-10: 1991 IEC268-10: 1991 Incorporating Amendment No.1 Sound system equipment Part 10: Methods for specifying and measuring the characteristics of peak programme level meters (Implementation of CENELEC HD483.10 S1)BS6840-10:1991 This British Standard, having been prepared unde
2、r the directionof the Electronic Equipment Standards Policy Committee, was published underthe authority of the Standards Board and comes intoeffect on 30August1991 BSI 05-1999 The following BSI references relate to the work on this standard: Committee reference EEL/32 Draft for comment88/23048 DC IS
3、BN 0 580 19973 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Electronic Equipment Standards Policy Committee (EEL/-) to Technical Committee EEL/32, upon which the following bodies were represented: Association for Consumer Research (
4、ACRE) Association of British Theatre Technicians Audio Engineering Society British Educational Equipment Association British Kinematograph, Sound and Television Society British Radio and Electronic Equipment Manufacturers Association British Telecommunications plc Consumer Policy Committee of BSI Fe
5、deration of British Audio Independent Television Association Independent Television Commission Institution of Electrical Engineers National Council for Educational Technology (NCET) Professional Lighting and Sound Association Radio Electrical and Television Retailers Association Royal Institute of B
6、ritish Architects Royal National Institute for the deaf Society of Cable Television Engineers Sound and Communication Industries Federation Amendments issued since publication Amd. No. Date Comments 7866 August1993 Indicated by a sideline in the marginBS6840-10:1991 BSI 05-1999 i Contents Page Commi
7、ttees responsible Inside front cover National foreword iv Foreword 2 Section 1. General 1.1 Scope 3 1.2 Normative references 3 Section 2. Conditions for specification and measurement 2.1 Conditions 3 2.2 Description of peak programme level meters 3 Section 3. Characteristics of peak programme level
8、meters 3.1 Reference indication 4 3.2 Reference input voltage and reference input level 4 3.3 Division of the scale 4 3.4 Amplitude-frequency response 4 3.5 Dynamic response 4 3.6 Pulse response 5 3.7 Dynamic linearity with scale range 5 3.8 Dynamic response below minimum calibration point 5 3.9 Del
9、ay time 5 3.10 Integration time 5 3.11 Overswing 5 3.12 Return time 5 3.13 Reversibility error 5 3.14 Input impedance 5 3.15 Distortion introduced by the peak programme level meter 5 3.16 Temperature range 6 3.17 Overload characteristic 6 3.18 Maximum input level 6 3.19 Supply voltage range 6 Sectio
10、n 4. Peak programme level meters, type I 4.1 Reference indication 6 4.2 Reference input voltage and reference input level 6 4.3 Division of the scale 6 4.4 Amplitude-frequency response 6 4.5 Dynamic response 6 4.6 Integration time 6 4.7 Overswing 7 4.8 Return time 7 4.9 Reversibility error 7 4.10 In
11、put impedance 7 4.11 Distortion introduced by the peak programme level meter 7 4.12 Temperature range 7 4.13 Overload characteristic 7 4.14 Maximum input level 7 4.15 Supply voltage range 7BS6840-10:1991 ii BSI 05-1999 Page Section 5. Peak programme level meters, type II 5.1 General 7 5.2 Reference
12、indication 8 5.3 Reference input voltage 8 5.4 Indicating instrument 8 5.5 Amplitude-frequency response 9 5.6 Dynamic response 9 5.7 Pulse response (normal mode) 9 5.8 Dynamic linearity within scale range (normal mode) 9 5.9 Dynamic response below minimum calibration point (normal mode) 10 5.10 Dela
13、y time (normal mode) 10 5.11 Integration time 10 5.12 Overswing 10 5.13 Return time 10 5.14 Reversibility error 10 5.15 Input impedance 10 5.16 Distortion introduced by the peak programme level meter 10 5.17 Temperature range 10 5.18 Overload characteristic (normal mode) 11 5.19 Maximum input level
14、11 5.20 Supply voltage range 11 Section 6. Peak programme level meters having incremental display 6.1 General 11 6.2 Number of discrete elements in the display 11 6.3 Display resolution 11 6.4 Indication of levels 11 6.5 Optical characteristics of displays 11 6.6 Operation above reference indication
15、 12 6.7 Displays using multiplex technique 12 6.8 Rate of element-switching (switch-on switch-off times) 12 Section 7. Incremental peak programme level meters for secondary and consumer applications 7.1 General 12 7.2 Reference indication 12 7.3 Number of discrete elements in the display 12 7.4 Disp
16、lay resolution 12 7.5 Amplitude-frequency response 12 7.6 Integration time 12 7.7 Return time 12 7.8 Reversibility error 12 Section 8. Classification for the characteristics to be specified 8.1 Introduction 13 8.2 Classification 13BS6840-10:1991 BSI 05-1999 iii Page Annex A (normative) Slow mode of
17、operation 16 Annex B (informative) Details of preferred indicating instrument 17 Annex ZA (normative) Other international publications quoted in this standard with the references of the relevant European publications 18 National annex NA (informative) Cross-references Inside back cover Figure 1 Pref
18、erred scale markings and dimensions for type 11a peak programme meters 14 Figure 2 Preferred scale markings for type 11b peak programme meters 15 Figure 3 Example of the display of an incremental peak programme level meter for secondary applications 15 Figure A.1 Circuit used to obtain the slow-indi
19、cation mode 16 Table 1 Dynamic response 6 Table 2 Calibration tolerances 8 Table 3 Dynamic response in normal mode 9 Table 4 Dynamic response in slow mode 9 Table 5 Drift in indicated readings 11BS6840-10:1991 iv BSI 05-1999 National foreword This Part of BS6840 has been prepared under the direction
20、 of the Electronic Equipment Standards Policy Committee and is identical with IEC268-10:1991 “Sound system equipment Part10: Peak programme level meters”, published by the International Electrotechnical Commission (IEC). This British Standard implements Harmonization Document HD483.10 S1, published
21、by the European Committee for Electrotechnical Standardization (CENELEC). This British Standard supersedes BS5428-9:1981 which is withdrawn. The purpose of this Part of BS6840 is to standardize the characteristics to be specified, the relevant methods of measurement and performance requirements (in
22、some cases) for: peak programme level meters, in general (section3); peak programme level meters, type I (section4); peak programme level meters, type II (section5); peak programme level meters having incremental displays (section6); peak programme level meters having incremental displays, for secon
23、dary and household applications (section7). In general, the methods of measurement recommended are those which are directly related to the definitions. This does not exclude the use of other methods which can be shown to give equivalent results. BS6840 consists of the following Parts: Part 1: Method
24、s for specifying and measuring general characteristics used for equipment performance (supersedes part of BS5428-1); Part 2: Glossary of general terms and calculation methods (supersedes part of BS5428-1); Part 3: Methods for specifying and measuring the characteristics of sound system amplifiers (s
25、upersedes BS5428-2); Part 4: Methods for specifying and measuring the characteristics 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); Part 6: Methods for specifying and measuri
26、ng the characteristics of auxiliary passive elements (previously BS5428-4); 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);
27、 Part 9: Methods for specifying and measuring the characteristics of artificial reverberation, time delay and frequency shift equipment (previously BS5428-8); Part 10: Methods for specifying and measuring the characteristics of peak programme level meters (supersedes BS5428-9); Part 11: Specificatio
28、n for application of connectors for the interconnection of sound system components (supersedes BS5428-5.2); Part 12: Specification for applications of connectors for broadcast and similar use (supersedes BS5428-5.3); Part 13: Guide for listening tests on loudspeakers (new); Part 14: Guide for circul
29、ar and elliptical loudspeakers; outer frame diameters and mounting dimensions (previously BS5428-5.1); Part 15: Specification for matching values for the interconnection of sound system components (supersedes BS5428-10); 1) In preparation.BS6840-10:1991 BSI 05-1999 v Part 16: Guide to the “RASTI” me
30、thod for the objective rating of speech intelligibility in auditoria (new); Part 17: Methods for specifying and measuring the characteristics of standard volume indicators. Copies of CCIR and CCITT documents may be purchased from BSI Sales Department, Linford Wood, Milton Keynes MK14 6LE. Typographi
31、cal error. In1.2.2 and3.1.1, the reference to “CMTT Recommendation661” should be read as “CCITT Recommendation661”. 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 B
32、ritish Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi tovi, theHDtitle page, pages2 to18, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have
33、 had amendments incorporated. This will be indicated in the amendment table on theinside front cover.vi blankHARMONIZATION DOCUMENT DOCUMENT DHARMONISATION HARMONISIERUNGSDOKUMENT HD483.10 S1 February1993 UDC 534.86:621.317.7 Descriptors: Sound system equipments, modulation, signal level, level mete
34、rs, characteristics, specifications, classifications English version Sound system equipment Part 10: Peak programme level meters (IEC268-10:1991) Equipements pour systmes lectroacoustiques Partie 10: Appareils de mesure des crtes de modulation (CEI268-10:1991) Elektroakustische Gerte Teil10: Spitzen
35、spannungs- Aussteuerungsmesser (IEC268-10:1991) This Harmonization Document was approved by CENELEC on1992-12-09. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for implementation of this Harmonization Document on a national level. Up-to-
36、date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This Harmonization Document exists in three official versions (English, French, German). A version in any other language made by translatio
37、n under the responsibility of a CENELEC member into its own 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, It
38、aly, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, 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-1
39、050 Brussels 1993 Copyright reserved to CENELEC members Ref. No. HD483.10 S1:1993 EBS6840-10:1991 BSI 05-1999 2 Foreword The CENELEC questionnaire procedure, performed for finding out whether or not the International Standard IEC268-10:1991 could be accepted without textual changes, has shown that n
40、o common modifications were necessary for the acceptance as Harmonization Document. The reference document was submitted to the CENELEC members for formal vote and was approved by CENELEC as HD483.10 S1 on9December1992. The following dates were fixed: For products which have complied with the releva
41、nt national standard before1993-12-01, as shown by the manufacturer or by a certification body, this previous standard may continue to apply for production until 1998-12-01. Annexes designated “normative” are part of the body of the standard. Annexes designated “informative” are given only for infor
42、mation. In this standard, Annex A and Annex ZA are normative and Annex B is informative. latest date of announcement of the HD at national level (doa) 1993-06-01 latest date of publication of aharmonized national standard (dop) 1993-12-01 latest date of withdrawal of conflicting national standards (
43、dow) 1993-12-01IEC268-10:1991 BSI 05-1999 3 Section 1. General 1.1 Scope This part of IEC268 applies to audio-frequency peak programme level meters, for use in equipment for broadcasting, sound reinforcement, sound recording and household entertainment. This standard does not apply to “Standard volu
44、me indicators” which is dealt with in IEC268-17. 1.2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of IEC268. At the time of publication, the editions indicated were valid. All standards are subject to revisi
45、on, and parties to agreements based on this part of IEC268 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. 1.2.1 IEC standards 65:1985, Safety re
46、quirements for mains operated electronic and related apparatus for household and similar general use. 268-1:1985, Sound system equipment Part1:General. 268-2:1987, Sound system equipment Part2:Explanation of general terms and calculation methods. 268-3:1988, Sound system equipment Part3:Amplifiers.
47、268-17:1990, Sound system equipment Part17:Standard volume indicators. 1.2.2 Other standards CMTT Recommendation 661, Signals for the alignment of international sound-programme connections. CCITT Recommendation J.15, Lining-up and monitoring and international sound-programme connection. CCITT Recomm
48、endation N.15, Maximum permissible power during an international sound-programme transmission. CCIR Report292-6, Measurement of programme level in sound broad-casting. Section 2. Conditions for specification and measurement 2.1 Conditions 2.1.1 General conditions Reference shall be made to IEC268-1
49、concerning: units and system of measurement; frequencies of measurement; quantities to be specified and their accuracy; marking and symbols for marking; filters, networks and measuring instruments for noise specification and measurement; ambient conditions; individual specifications and type specifications; graphical presentation; method of producing a uniform alternating magnetic field; search coil for measuring the magnetic field strength; scales for graphical pr
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