1、BSI Standards PublicationCable networks for television signals, sound signals and interactive servicesPart 2-1: Electromagnetic compatibility measurementsPD CLC/TR 50083-2-1:2014National forewordThis Published Document is the UK implementation of CLC/TR 50083-2-1:2014. The UK participation in its pr
2、eparation was entrusted by Technical Committee EPL/100, Audio, video and multimedia systems and equipment, to Subcommittee EPL/100/4, Cable distribution equipment and systems.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not pu
3、rport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2014.Published by BSI Standards Limited 2014 ISBN 978 0 580 85961 8ICS 33.060.40Compliance with a British Standard cannot confer immunity from legal oblig
4、ations.This Published Document was published under the authority of theStandards Policy and Strategy Committee on 31 October 2014.Amendments/corrigenda issued since publicationDate Text affectedPUBLISHED DOCUMENTPD CLC/TR 50083-2-1:2014TECHNICAL REPORTRAPPORT TECHNIQUETECHNISCHER BERICHTCLC/TR 50083
5、-2-1 September 2014 ICS 33.060.40 English Version Cable networks for television signals, sound signals and interactive services - Part 2-1: Electromagnetic compatibility measurements To be completed Kabelnetze fr Fernsehsignale, Tonsignale und interaktive Dienste - Teil 2-1: Messungen der elektromag
6、netischen Vertrglichkeit This Technical Report was approved by CENELEC on 2014-07-28. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Gr
7、eece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Elect
8、rotechniqueEuropisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. CLC/TR 50083-2-1:2014 E CLC/TR 50083-2-1:2014 - 2 - Conte
9、nts page Foreword 4 1 Scope 5 1.1 General . 5 1.2 Specific scope of CLC/TR 50083-2-1 5 2 Normative references . 6 3 Term, definitions, symbols and abbreviations . 6 3.1 Terms and definitions 6 3.2 Symbols 10 3.3 Abbreviations 11 4 Considerations on EMC measurements 11 4.1 General . 11 4.2 General EM
10、C measurement considerations . 12 4.3 Envelope (peak) detection mode . 13 4.4 Quasi-peak detection mode. 13 4.5 Average detection mode . 14 5 EMC measurement apparatus 14 5.1 Measuring receiver . 14 5.1.1 General . 14 5.1.2 The envelope detector. 15 5.1.3 The peak detector . 15 5.1.4 The quasi-peak
11、detector 15 5.2 EMC analyser . 16 5.3 Response of the measuring receiver (or EMC analyser) to disturbing signals 17 5.3.1 Sinusoidal signals . 17 5.3.2 Analogue television signals . 18 5.3.3 Impulse disturbance signals 18 5.3.4 Random impulse noise signals 21 5.4 Response of a spectrum analyser to d
12、isturbing signals . 23 5.5 Correction factors for bandwidth and detectors . 23 6 Measurement of analogue TV modulated signals . 23 6.1 General considerations . 23 6.2 Correction factors for bandwidth and detectors . 24 7 Measurement of QAM modulated signals . 24 7.1 Peak to average ratio 24 7.2 Corr
13、ection factors for bandwidth and detectors . 25 7.3 Correction factors between different detectors 26 7.4 Fraction of the time the mean power is exceeded 27 7.5 Linear operation of amplifiers 27 7.6 Measurements on cable modems 27 7.7 Measuring equipment setting for QAM signal level measurement 28 A
14、nnex A (informative) Field strength measurement . 29 A.1 General 29 A.2 Connection of the equipment 29 PD CLC/TR 50083-2-1:2014- 3 - CLC/TR 50083-2-1:2014 A.3 Measurement procedure . 29 A.3.1 Analogue modulated signals 29 A.3.2 Digitally modulated signals 30 A.4 Field strength due to a transmitted p
15、ower . 31 A.5 Received voltage due to a radiated field . 32 Annex B (informative) LISN (Line Impedance Stabilisation Network) . 34 Bibliography 35 PD CLC/TR 50083-2-1:2014CLC/TR 50083-2-1:2014 - 4 - Foreword This document (CLC/TR 50083-2-1:2014) has been prepared by CLC/TC 209 “Cable networks for te
16、levi-sion signals, sound signals and interactive services“. Attention is drawn to the possibility that some of the elements of this document may be the subject of pa-tent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. PD CLC/TR 50083-2-1:2014-
17、 5 - CLC/TR 50083-2-1:2014 1 Scope 1.1 General Standards and deliverables of EN 60728 series deal with cable networks including equipment and associated methods of measurement for headend reception, processing and distribution of television and sound signals and for processing, interfacing and trans
18、mitting all kinds of data signals for interactive services using all applicable transmission media. These signals are typically transmitted in networks by frequency-multiplexing techniques. This includes for instance regional and local broadband cable networks, extended satellite and terrestrial tel
19、evision distribution systems, individual satellite and terrestrial television receiving systems, and all kinds of equipment, systems and installations used in such cable networks, distribution and receiving systems. The extent of this standardization work is from the antennas and/or special signal s
20、ource inputs to the headend or other interface points to the network up to the terminal input of the customer premises equipment. The standardization work will consider coexistence with users of the RF spectrum in wired and wireless transmission systems. The standardization of any user terminals (i.
21、e. tuners, receivers, decoders, multimedia terminals etc.) as well as of any coaxial, balanced and optical cables and accessories thereof is excluded. 1.2 Specific scope of CLC/TR 50083-2-1 This Technical Report describes EMC measurements using specific measuring apparatus or alternative methods of
22、measurement (e.g. spectrum analyser) and applies to the radiation characteristics of EM-active equipment (active and passive equipment) for the reception, processing and distribution of television, sound and interactive multimedia signals as dealt with in the following parts of EN 50083 or EN 60728
23、series: EN 60728-3 “Active wideband equipment for coaxial cable networks“; EN 60728-4 “Passive wideband equipment for coaxial cable networks“; EN 60728-5 “Headend equipment“; EN 60728-6 “Optical equipment“; and covers the following frequency ranges: 150 kHz to 30 MHz; 30 MHz to 1 GHz. PD CLC/TR 5008
24、3-2-1:2014CLC/TR 50083-2-1:2014 - 6 - 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the re
25、ferenced document (including any amendments) applies. IEC 60050-161, International Electrotechnical Vocabulary (IEV) Chapter 161: Electromagnetic compati-bility EN 55016-1-1, Specification for radio disturbance and immunity measuring apparatus and methods Part 1-1: Radio disturbance and immunity mea
26、suring apparatus Measuring apparatus (CISPR 16-1-1) ISO/IEC Guide 99:2007, International vocabulary of metrology - Basic and general concepts and associ-ated terms (VIM) 3 Term, definitions, symbols and abbreviations 3.1 Terms and definitions For the purpose of this document, the following terms and
27、 definitions apply. Also see IEC 60050-161 and the ISO/IEC Guide 99:2007. 3.1.1 bandwidth Bnthe width of the overall selectivity curve of the receiver between two points at a stated attenuation below the midband response. The bandwidth is represented by the symbol Bn, where n is the stated attenuati
28、on in decibels 3.1.2 CATV network originally defined as Community Antenna Television network; now covering regional and local broadband cable networks designed to provide sound and television signals as well as signals for interactive services to a regional or local area 3.1.3 CISPR indicating range
29、 it is the range specified by the manufacturer which gives the maximum and the minimum meter indica-tions within which the receiver meets the requirements of this section of CISPR 16 3.1.4 electrical charge time constant TCthe time needed after the instantaneous application of a constant sine-wave v
30、oltage to the stage immedi-ately preceding the input of the detector for the output voltage of the detector to reach 63 % of its final value Note 1 to entry: This time constant is determined as follows: A sine-wave signal of constant amplitude and having a frequency equal to the mid-band frequency o
31、f the IF amplifier is applied to the input of the stage immediately preced-ing the detector. The indication, D, of an instrument having no inertia (e.g., a cathode-ray oscilloscope) connected to a terminal in the DC amplifier circuit so as not to affect the behaviour of the detector, is noted. The l
32、evel of the signal is chosen such that the response of the stages concerned remains within the linear operating range. A sine wave signal of this level, applied for a limited time only and having a wave train of rectangular envelope is gated such that the deflection registered is 0,63 D. The duratio
33、n of this signal is equal to the charge time of the detector. PD CLC/TR 50083-2-1:2014- 7 - CLC/TR 50083-2-1:2014 3.1.5 electrical discharge time constant TDthe time needed after the instantaneous removal of a constant sine-wave voltage applied to the stage immediately preceding the input of the det
34、ector for the output of the detector to fall to 37 % of its initial value Note 1 to entry: The method of measurement is analogous to that for the charge time constant, but instead of a signal being applied for a limited time, the signal is interrupted for a definite time. The time taken for the defl
35、ection to fall to 0,37 D is the discharge time constant of the detector. 3.1.6 electromagnetic-active equipment all passive and active equipment carrying RF signals are considered as electromagnetic-active equipment because they are liable to cause electromagnetic disturbances or the performance of
36、them is liable to be affected by such disturbances 3.1.7 extended satellite television distribution network or system distribution network or system designed to provide sound and television signals received by satellite re-ceiving antenna to households in one or more buildings Note 1 to entry: This
37、kind of network or system could be eventually combined with terrestrial antennas for the addi-tional reception of TV and/or radio signals via terrestrial networks. Note 2 to entry: This kind of network or system could also carry control signals for satellite switched systems or other signals for spe
38、cial transmission systems (e.g. MoCA or WiFi) in the return path direction. 3.1.8 extended terrestrial television distribution network or system distribution network or system designed to provide sound and television signals received by terrestrial re-ceiving antenna to households in one or more bui
39、ldings Note 1 to entry: This kind of network or system could be eventually combined with a satellite antenna for the addi-tional reception of TV and/or radio signals via satellite networks. Note 2 to entry: This kind of network or system could also carry other signals for special transmission system
40、s (e.g. MoCA or WiFi) in the return path direction. 3.1.9 impulse bandwidth Bimp ( ) ( )impmax/ 2oB A t G IS= where A(t)maxis the peak of the envelope at the IF output of the receiver with an impulse area IS applied at the receiver input; Gois the gain of the circuit at the centre frequency. Specifi
41、cally for two critically-coupled tuned transformers, imp 6 31, 05 1, 31 B BB= = where B6and B3are respectively the bandwidths at the 6 dB and 3 dB points. PD CLC/TR 50083-2-1:2014CLC/TR 50083-2-1:2014 - 8 - 3.1.10 impulse area IS the impulse area (sometimes called impulse strength, IS) is the voltag
42、e-time area of a pulse defined by the integral: +=-d )( ttVIS (expressed in Vs or dB(Vs) Note 1 to entry: Spectral density () is related to impulse area and expressed in V/MHz or dB(V/MHz). For rectan-gular impulses of pulse duration T at frequencies f 1/T, the relationship (V/MHz) = 2 106IS (Vs) ap
43、plies. 3.1.11 individual satellite television receiving system system designed to provide sound and television signals received from satellite(s) to an individual house-hold Note 1 to entry: This kind of system could also carry control signals for satellite switched systems or other signals for spec
44、ial transmission systems (e.g. MoCA or WiFi) in the return path direction. 3.1.12 individual terrestrial television receiving system system designed to provide sound and television signals received via terrestrial broadcast networks to an individual household Note 1 to entry: This kind of system cou
45、ld also carry other signals for special transmission systems (e.g. MoCA or WiFi) in the return path direction. 3.1.13 local broadband cable network network designed to provide sound and television signals as well as signals for interactive services to a local area (e.g. one town or one village) 3.1.
46、14 MATV network originally defined as Master Antenna Television network; now covering extended terrestrial television dis-tribution networks or systems designed to provide sound and television signals received by terrestrial re-ceiving antenna to households in one or more buildings Note 1 to entry:
47、This kind of network or system could be eventually combined with a satellite antenna for the addi-tional reception of TV and/or radio signals via satellite networks. Note 2 to entry: This kind of network or system could also carry other signals for special transmission systems (e.g. MoCA or WiFi) in
48、 the return path direction. 3.1.15 mechanical time constant of a critically damped indicating instrument TMML/ 2TT= where: TLis the period of free oscillation of the instrument with all damping removed. Note 1 to entry: For a critically damped instrument, the equation of motion of the system may be
49、written as: ( ) ( )22 2MMd / d 2 d / d kT tT t i+ +=where: PD CLC/TR 50083-2-1:2014- 9 - CLC/TR 50083-2-1:2014 is the deflection; i is the current through the instrument; k is a constant. It can be deduced from this relationship that the time constant is also equal to the duration of a rectangular pulse (of constant amplitude) that produces a deflection equal to 35 % of the steady deflection produced by a continuous cur-rent having the same amplitude as that of the rectangular pulse. Note 2 to entry: The methods of mea
copyright@ 2008-2019 麦多课文库（www.mydoc123.com）网站版权所有
备案/许可证编号：苏ICP备17064731号-1