1、BRITISH STANDARD BS 905-2:1991 EN 55020:1988 Sound and television broadcast receivers and associated equipment: electromagnetic compatibility Part 2: Specification for immunity from radio interference of broadcast receivers and associated equipment This European Standard EN55020:1988 has the status
2、of a British StandardBS905-2:1991 This British Standard, having been prepared under the directionof the General Electrotechnical Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 28 February 1991 BSI 09-1999 The following BSI references relate
3、 to the work on this standard: Committee reference GEL/110 Draft for comment 85/38828 DC ISBN 0 580 16666 6 Cooperating organizations The European Committee for Electrotechnical Standardization (CENELEC), under whose supervision this European Standard was prepared, comprises the National Committees
4、of the following countries: Austria Luxemburg Belgium Netherlands Denmark Norway Finland Portugal France Spain Germany Sweden Greece Switzerland Ireland United Kingdom Italy Amendments issued since publication Amd. No. Date of issue CommentsBS905-2:1991 BSI 09-1999 i Contents Page Cooperating organi
5、zations Inside front cover National foreword ii Brief history 2 Foreword 2 Text of EN 55020 7 National appendix Y Inside back cover National appendix Z Inside back coverBS905-2:1991 ii BSI 09-1999 National foreword This British Standard has been prepared under the direction of the General Electrotec
6、hnical Standards Policy Committee and is the English language version of EN55020, which is related to CISPR Publication20:1985 “Measurement of the immunity of sound and television broadcast receivers and associated equipment in the frequency range1.5MHz to30MHz by the current injection method. Guida
7、nce on immunity requirements for the reduction of interference caused by radio transmitters in the frequency range26MHz to30MHz”. It supersedes BS905-2:1985 which is withdrawn. The title has been changed from that of the1985 edition to align with EN55020. Cross references. Details of other internati
8、onal publications quoted in this standard are given on page2. Where there are British Standards either identical or technically equivalent to these International Standards, the relationship is given in National appendix Z. A British Standard does not purport to include all the necessary provisions o
9、f 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 obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theENtitle page, pages2 t
10、o42, 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.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN55020 June1988 UDC621.396.62:621.397.4
11、3:621.396.669.8:621.391.82:620.1:621.317.3 Key words: Electromagnetic compatibility; radio interference; broadcast receiver; associated equipment; method of measurement; immunity; characteristics English version Immunity from radio interference of broadcast receivers and associated equipment Immunit
12、 aux perturbations radiolectriques des rcepteurs de radiodiffusion et des appareils associs Strfestigkeit von Rundfunkempfngern und angeschlossenen Gerten This European Standard was ratified by CENELEC on22 September1987. CENELEC members are bound to comply with the requirements of the CENELEC Inter
13、nal 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 such national standards may be obtained on application to the CENELEC Central Secretariat or to any CE
14、NELEC member. This European Standard exists in three official versions (English, French and German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to CENELEC Central Secretariat has the same status as the official
15、versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxemburg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CENELEC European Committee for Electrotechnical Stan
16、dardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels CENELEC 1988, Copyright reserved to all CENELEC members Ref. No. EN 55020:1988 EEN55020:1988 2 BSI 09-1999 Brief history The Draft Eur
17、opean Standard has been prepared by the Ad Hoc Working Group, installed during the CENELEC CISPR meeting in October1984. Comments, prepared by several National Committees, were discussed during the CENELEC CISPR meeting in November1985. Most of these comments are included in this document. Technical
18、 text The text of the EN55020 was approved by CENELEC on22 September1987 as a European Standard. The following dates were fixed at the 55th BT on1March1988: Foreword The aim of this document is to reduce effects of radio interference and to avoid trade-barriers between the CENELEC countries. This do
19、cument provides a common standard on immunity for the period that an international CISPR Publication has not been accepted. The Technical Committee CENELEC/CISPR recommends strongly that this European Standard should be adapted to the CISPR Publication on immunity as soon as this International Stand
20、ard becomes available. References EN 55022 (1987), Information Technology Equipment Limits of interference and measurement methods. IEC/CISPR Publication 16 (1987), CISPR specification for radio interference measuring apparatus and measuring methods. IEC/CISPR Publication 20 (1985), Measurement of t
21、he immunity of sound and television receivers and associated equipment in the frequency range1.5MHz to30MHz by the current injection method. Guidance on immunity requirements for the reduction of interference caused by radio transmitters in the frequency range26MHz to30MHz IEC Publication 315-1 (197
22、0), Methods of measurement on radio receivers for various classes of emission. Part 1: General conditions for measurements and measuring methods applying to several types of receivers. IEC Publication 50 (902) (1973), International Electrotechnical Vocabulary. Chapter 902: Radio interference CCIR Re
23、commendation 468-4 (1986), Measurement of audio-frequency noise in broadcasting, in sound-recording systems and on sound programme circuits. CCIR Recommendation 471-1 (1986), Nomenclature and description of colour bar signals. CCIR Recommendation 500-3 (1986), Method for the subjective assessment of
24、 the quality of television pictures. CCIR Report 624-3 (1986), Characteristics of television systems. doa: 1988-06-01 dop: 1988-12-01 dow: 1989-12-01EN55020:1988 BSI 09-1999 3 Contents Page Brief history 2 Foreword 2 1 Scope 7 2 Definitions 7 3 Limits of immunity 8 4 Input immunity requirements 8 4.
25、1 Limits of input immunity of the VHF band II part of sound receivers 8 4.2 Limits of input immunity of television receivers 8 4.3 Limits of input immunity of associated equipment 12 5 Requirements for immunity from conducted voltages 12 5.1 Limits of immunity from conducted voltages of mains supply
26、 terminal and loudspeaker and headphone terminals 12 5.2 Limits of immunity from conducted voltages of audio input and output terminals (except loudspeaker and headphone terminals) 12 5.3 Exceptions to the limits 12 5.4 Limits of immunity from conducted voltages of associated equipment 12 6 Requirem
27、ents for immunity from conducted currents 13 6.1 Limits of immunity from conducted currents of antenna terminals 13 6.2 Limits of immunity from conducted currents of associated equipment 13 7 Requirements for immunity from radiated fields 13 7.1 Limits of immunity from radiated fields of audio funct
28、ions 13 7.2 Limits of immunity from radiated fields of VHF band II sound broadcast reception function 13 7.3 Limits of immunity from radiated fields of television broadcast reception function 14 8 Requirements for screening effectiveness 14 8.1 Limits of screening effectiveness 14 9 Test criteria an
29、d general measurement procedures 14 9.1 Criterion of sound interference 14 9.1.1 Measurement procedure 14 Page 9.1.2 Audio power-output measurement 14 9.2 Criterion of picture interference 15 9.2.1 Measurement procedure 15 10 Method of measurement of input immunity 15 10.1 Measurement of sound recei
30、vers 15 10.1.1 Measuring set-up 15 10.1.2 Measurement with unwanted signals outside the VHF band II range 16 10.1.3 Measurement with unwanted signals inside the VHF band II range 16 10.2 Measurement of television receivers 17 10.2.1 Measuring set-up 17 10.2.2 Measuring procedure 17 11 Method of meas
31、urement of immunity from conducted voltages 19 11.1 Measuring circuit and set-up 19 11.2 Measurement of loudspeaker, headphone, or mains terminals 19 11.3 Measurement of audio input and output terminals (except loudspeaker and head-phone terminals) 19 11.4 Measurement procedure 19 12 Method of measu
32、rement of immunity from conducted currents 24 12.1 Coupling units 24 12.2 Measurement set-up 24 12.3 Measurement circuit 25 12.4 Measurement procedure 26 13 Method of measurement of immunity from radiated fields 26 13.1 The open stripline 26 13.2 Measurement set-up 26 13.3 Measurement circuit 28 13.
33、4 Measurement procedure 28 14 Method of measurement of screening effectiveness 29 14.1 Measuring set-up 29 14.2 Measurement procedure 29 15 Application of limits in tests for conformity of appliances in series production 30 Annex A Coupling units and low-pass filter for the measurement of immunity f
34、rom conductedcurrents in the frequency range 0.15 MHz to 150 MHz 31EN55020:1988 4 BSI 09-1999 Page Annex B Construction details of the open stripline 36 Annex C Calibration of the open stripline 41 Annex D Specification of filters and weighting network 41 Figure 1 Limits of input immunity from unwan
35、ted signals outside the VHF band II range 9 Figure 2 Limits of input immunity from unwanted signals inside the VHF band II range 10 Figure 3 Audio power output measurement 16 Figure 4 Measuring set-up for input immunity measurement of sound broadcast receivers 17 Figure 5 Measuring set-up for input
36、immunity measurement of television receivers 18 Figure 6 Measurement principle for the measurement of the immunity from conductedvoltages 20 Figure 7a Mains stop filter (MSF) 21 Figure 7b Example for the high-pass filter 100 kHz (HP) 22 Figure 7c Decoupling network (DN) 22 Figure 7d RC network for a
37、udio inputs (RC i ) 22 Figure 7e RC network for audio outputs (RC o ) 23 Figure 8 General principle of the current injection method 24 Figure 9 Measurement principle for theimmunity from conducted currents 25 Figure 10 Example of the arrangement of an open stripline TEM device in combination with ab
38、sorbing plates inside a screened room with dimensions of3m 3.5m 27 Figure 11 Measurement principle for the immunity of broadcast receivers from radiated fields in the frequency range 0.15 MHz to 150 MHz 28 Figure 12 Measuring set-up for screening effectiveness 30 Figure 13 Coupling unit type A (for
39、coaxial antenna input) 33 Figure 14 Coupling unit type M 34 Figure 15 Coupling unit type L (for loudspeaker leads) 35 Page Figure 16 Coupling unit type Sr with load resistances 35 Figure 17 Measuring set-up to check the insertion loss of the coupling in the frequency range30MHz to150MHz 36 Figure 18
40、 Open stripline TEM device, basic configuration with matching network and terminating impedance 36 Figure 19 Overview of an open stripline TEM device 37 Figure 20a Constructional details of an open stripline, TEM device 38 Figure 20b Supplementary constructional details of the open stripline, TEM de
41、vice 38 Figure 21 Matching network MN 39 Figure 22 Terminating impedance TI 39 Figure 23 Band-stop filter circuit for mains connection (M) 40 Figure 24 Circuit arrangement of band-stop filter for loudspeaker signal decoupling (BS) 40 Figure 25 Band pass filter 0.5 kHz to 3 kHz 42 Table 1 Limits of i
42、nput immunity from unwanted signals outside the VHF band II range 8 Table 2 Limits of input immunity from unwanted signals inside the VHF band II range 10 Table 3 Limits of input immunity of televisionreceivers for systems B, G and I 11 Table 4 Limits of input immunity of televisionreceivers for sys
43、tem L 11 Table 5 Limits of immunity from conductedvoltages of mains, loudspeaker andheadphone terminals 12 Table 6 Limits of immunity from conductedvoltages of audio input and outputterminals (except loudspeaker andheadphone terminals) 12 Table 7 Unwanted signal frequencies to beexcluded in tests on
44、 sound and television reception functions 13 Table 8 Limits of immunity from conductedcurrents of antenna terminals 13 Table 9 Limits of immunity from radiated fieldsof audio functions 13 Table 10 Limits of immunity from radiated fieldsof VHF band II function 13EN55020:1988 BSI 09-1999 5 Page Table
45、11 Limits of immunity from radiated fields of television function 14 Table 12 Measurement conditions for loudspeaker, headphone or mains terminals 23 Table 13 Measurement conditions for audioinputand output terminals (except loudspeaker andheadphone) 23 Table 14 Measurement conditions, operatingmode
46、 and wanted signal of receiverstested on immunity from radiated fields 29 Table 15 306 blankEN55020:1988 BSI 09-1999 7 1 Scope 1.1 This standard applies to the radio interference immunity of: television broadcast receivers; sound broadcast receivers; associated equipment. 1.2 Procedures are given fo
47、r the measurements of immunity and limits are laid down within the frequency range0.15MHz to1000MHz. There shall be80% confidence that at least80% of the series-produced appliances comply with these limits. 1.3 For sound broadcast receivers in the long-wave, medium-wave and short-wave operation mode
48、, immunity requirements are restricted to those in subclause6.1. 1.4 No immunity requirements apply to sound broadcast receivers and television broadcast receivers which have an internal battery power facility and which have no built in facility for mains power connection. 1.5 No immunity requiremen
49、ts apply to sound broadcast receivers and television broadcast receivers without a connection facility for an external antenna. 2 Definitions For the purpose of this standard, the definitions contained in IEC Publication 50 (902): International Electrotechnical Vocabulary (IEV), Chapter902: Radio Interference, apply, extended with the following specific definitions: 2.1 sound receivers are appliances intended for the reception of sound broadcast radio transmissions N
