1、 IEC 62153-4-14 Edition 1.0 2012-05 INTERNATIONAL STANDARD Metallic communication cable test methods Part 4-14: Electromagnetic compatibility (EMC) Coupling attenuation of cable assemblies (field conditions) absorbing clamp method IEC 62153-4-14:2012(E) colour inside THIS PUBLICATION IS COPYRIGHT PR
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9、62153-4-14 Edition 1.0 2012-05 INTERNATIONAL STANDARD Metallic communication cable test methods Part 4-14: Electromagnetic compatibility (EMC) Coupling attenuation of cable assemblies (field conditions) absorbing clamp method INTERNATIONAL ELECTROTECHNICAL COMMISSION P ICS 33.040.20 PRICE CODE ISBN
10、978-2-83220-086-5 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. colour inside 2 62153-4-14 IEC:2012(E) CONTENTS FOREWORD . 3 1 Scope . 5 2 Normative references . 5 3 Terms and definitions .
11、5 4 Test method . 6 4.1 Equipment . 6 4.1.1 General . 6 4.1.2 Balun requirements . 6 4.1.3 Extension cable requirements 7 4.2 Test sample 8 4.2.1 General . 8 4.2.2 Tested length 8 4.2.3 Preparation of test sample . 8 4.3 Calibration procedure 9 4.4 Test set-up 9 4.4.1 General . 9 4.4.2 Test set-up v
12、erification 10 4.5 Measuring procedure . 11 4.5.1 General . 11 4.5.2 Example of link measurement 11 5 Expression of test results . 12 6 Test report 12 6.1 General . 12 6.2 Evaluation of test results . 13 Bibliography 16 Figure 1 Measurement of surface wave at one end of a link or channel 6 Figure 2
13、Termination of link or channel or applied extension cable . 9 Figure 3 Example of a three-connector link configuration as defined in ISO/IEC 11801 11 Figure 4 Wall outlet end measurement . 12 Figure 5 Typical measurement of an unscreened channel Coupling attenuation, A is 43 dB . 14 Figure 6 Typical
14、 measurement of a screened balanced channel Coupling attenuation, A is 57 dB 14 Figure 7 Double wall outlet, right port (without connected screen) Coupling attenuation, A is 44,8 dB . 15 Figure 8 Double wall outlet, left port (with connected screen) Coupling attenuation, A is 61,5 dB 15 Table 1 Balu
15、n performance characteristics . 7 62153-4-14 IEC:2012(E) 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ METALLIC COMMUNICATION CABLE TEST METHODS Part 4-14: Electromagnetic compatibility (EMC) Coupling attenuation of cable assemblies (field conditions) absorbing clamp method FOREWORD 1) The Internati
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25、ce upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the ele
26、ments of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 62153-4-14 has been prepared by IEC technical committee 46: Cables, wires, waveguides, R.F. connectors, R.F. and microwave pa
27、ssive components and accessories. The text of this standard is based on the following documents: FDIS Report on voting 46/400/FDIS 46/415/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been
28、drafted in accordance with the ISO/IEC Directives, Part 2. 4 62153-4-14 IEC:2012(E) A list of all the parts in the IEC 62153 series, published under the general title: Metallic communication cable test methods, can be found on the IEC website. The committee has decided that the contents of this publ
29、ication will remain unchanged until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this sta
30、ndard may be issued at a later date. IMPORTANT The colour inside logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printer. 62153-4-1
31、4 IEC:2012(E) 5 METALLIC COMMUNICATION CABLE TEST METHODS Part 4-14: Electromagnetic compatibility (EMC) Coupling attenuation of cable assemblies (field conditions) absorbing clamp method 1 Scope This part of IEC 62153 gives the in-field test method that is used to determine the coupling attenuation
32、 for installed links and channels used in analogue and digital communication systems. This method is used to determine the attenuation of disturbing power to signal power in a cabling system, and vice versa. This determines the influence from cabling on the EMC performance of a system. NOTE 1 The co
33、upling attenuation of installed links and channels is dependent upon the performance of the cabling components (balance and screening if applicable), workmanship (especially termination of screens) and earthing and grounding. This procedure determines the overall effect of these parameters. NOTE 2 T
34、his method cannot be used for verification of compliance with emission and immunity EMC standards for the complete system, including active components. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its appli
35、cation. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050 (all parts), International Electrotechnical Vocabulary (available at http:/www.electropedia.org/) IEC 61196-1, Coaxial com
36、munication cables Part 1: Generic specification General, definitions and requirements IEC 62153-4-5:2006, Metallic communication cable test methods Part 4-5: Electromagnetic Compatibility (EMC) Coupling or screening attenuation Absorbing clamp method 3 Terms and definitions For the purposes of this
37、document, the terms and definitions given in IEC 60050-726 and IEC 61196-1 apply. The theoretical background is given in IEC/TR 62153-4-0 and IEC/TR 62153-4-1. 6 62153-4-14 IEC:2012(E) 4 Test method 4.1 Equipment 4.1.1 General The field test equipment 1shall be able to measure the coupling attenuati
38、on according to the principle defined in 5.1.1 of IEC 62153-4-5:2006 and Figure 1 below. Key 1 Signal generator, output impedance Z 02 Balun (if applicable) 3 Screen of signal generator and balun if needed for high dynamic range 4 Reflector plate, minimum size 0,2 m 0,2 m 5 Absorbing clamp 6 Absorbe
39、r (ferrite tube) of the clamp, insertion loss 10 dB 27 Current transformer of the clamp 8 Extension cable for connection to link under test. length 2 m 9 Measuring receiver cable (use the same in measurement and calibration) 10 Measuring receiver 11 Connecting hardware in measured end of link or cha
40、nnel 12 Link or channel under test 13 Load termination of far end of link or channel under test Figure 1 Measurement of surface wave at one end of a link or channel 4.1.2 Balun requirements For the measurement of symmetrical links or channels, a means for generating symmetrical signals shall be prov
41、ided. If the generator is unbalanced, this may be performed by the use of a balun or 180 power splitter. The minimum requirements for this device are specified in Table 1. _ 1Instead of a signal generator and measuring receiver or network analyser, a spectrum analyser with tracking generator can be
42、used, which is available as a field test equipment. 2There is no requirement for an absorber in the far end. IEC 897/12 62153-4-14 IEC:2012(E) 7 The attenuation of the balun shall be kept as low as possible because it will limit the dynamic range of the coupling attenuation or screening attenuation
43、measurements. Table 1 Balun performance characteristics Parameter Value Impedance, primarya50 (unbalanced) Impedance, secondary b100 or 150 (balanced) Operational attenuation d(including matching pads if used) 10 dB Return loss, bi-directional 6 dB Power rating To accommodate the power of the genera
44、tor and amplifier (if applicable) Output signal balancec 50 dB from 30 MHz to 100 MHz 30 dB from 100 MHz to the highest measured frequency aPrimary impedance may differ if necessary to accommodate analyser outputs other than 50 . bBalanced outputs of the test baluns shall be matched to the nominal i
45、mpedance of the symmetrical patch cord / cable pair. 100 shall be used for termination of 120 cabling. cMeasured per ITU-T Recommendations G.117 and O.9. dThe operational attenuation of a balun shall be mathematically deduced from 3 operational attenuation measurements with 3 baluns back-to-back. 4.
46、1.3 Extension cable requirements An extension cable is only required if the channel or link under test does not include a cable, which can be connected to the test set-up. The length of the extension cable shall be 2 m 0,1 m. Unscreened extension cables shall be used for testing unscreened, balanced
47、 links or channels. Screened, balanced extension cables shall be used for testing screened, balanced links or channels. Coaxial extension cables shall be used for testing coaxial links or channels. The electrical transmission performance, including electromagnetic screening and unbalance attenuation
48、 of the extension cables, shall be better or equal to the performance of the link or channel under test. The choice of the extension cable should assure the minimum possible insertion loss and reflection loss of the set-up. The extension cables shall have the same nominal characteristic impedance as
49、 the link or channel under test. Likewise, the same type of insulation (i.e. foamed or solid) shall be used. The insertion loss of an extension cable including mating connector, if applicable, shall be less than 2,0 dB up to the highest measurement frequency. The extension cables, any mating connectors and the connection between extension cables and the mating connectors, if applicable, should have a balance or screening or balance
