1、 IEC 62153-4-11 Edition 1.0 2009-08 INTERNATIONAL STANDARD Metallic communication cable test methods Part 4-11: Electromagnetic compatibility (EMC) Coupling attenuation or screening attenuation of patch cords, coaxial cable assemblies, pre-connectorized cables Absorbing clamp method IEC 62153-4-11:2
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9、t us: Email: csciec.ch Tel.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 62153-4-11 Edition 1.0 2009-08 INTERNATIONAL STANDARD Metallic communication cable test methods Part 4-11: Electromagnetic compatibility (EMC) Coupling attenuation or screening attenuation of patch cords, coaxial cable assemblie
10、s, pre-connectorized cables Absorbing clamp method INTERNATIONAL ELECTROTECHNICAL COMMISSION N ICS 33.100; 33.120.10 PRICE CODE ISBN 2-8318-1055-9 Registered trademark of the International Electrotechnical Commission colour inside 2 62153-4-11 IEC:2009(E) CONTENTS FOREWORD.3 1 Scope.5 2 Normative re
11、ferences5 3 Terms and definitions .5 4 Test method .5 4.1 Equipment .5 4.1.1 General .5 4.1.2 Balun requirements6 4.1.3 Test head and extension cable requirements7 4.1.4 Impedance matching8 4.2 Test sample.8 4.2.1 Length of the patch cords under test 8 4.2.2 Length of extension cables connected to p
12、atch cord under test 8 4.2.3 Tested length.8 4.2.4 Preparation of extension cable and test head .8 4.3 Calibration procedure 9 4.4 Test set-up9 4.4.1 General .9 4.4.2 Test set-up verification.11 4.5 Measuring procedure.12 5 Expression of test results12 6 Test report12 6.1 General .12 6.2 Evaluation
13、of test results13 Figure 1 Measurement of surface wave at near end of patch cord.6 Figure 2 Termination of extension cables9 Figure 3 Test set-up for a near end measurement of a double-ended patch cord.10 Figure 4 Test set-up for a near end measurement of a single-ended patch cord 10 Figure 5 Test s
14、et-up for a near end measurement of a double-ended patch cord.11 Figure 6 Validation test set-up12 Figure 7 Typical measurement of an unscreened balanced patch cord 14 Figure 8 Typical measurement of a screened balanced patch cord14 Table 1 Balun performance characteristics (30 MHz to 1 GHz)7 62153-
15、4-11 IEC:2009(E) 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ METALLIC COMMUNICATION CABLE TEST METHODS Part 4-11: Electromagnetic compatibility (EMC) Coupling attenuation or screening attenuation of patch cords, coaxial cable assemblies, pre-connectorized cables Absorbing clamp method FOREWORD 1)
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25、ive 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 elements of this IEC Publication may be the subject of patent rights. IEC shall not be held respons
26、ible for identifying any or all such patent rights. International Standard IEC 62153-4-11 has been prepared by IEC technical committee 46: Cables, wires, waveguides, R.F. connectors, R.F. and microwave passive components and accessories. The text of this standard is based on the following documents:
27、 CDV Report on voting 46/311/CDV 46/327/RVC 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 is to be read in conjunction with IEC 62153-4-5 (2006). 4 62153-4-11 IEC:2009(E) This publication has been
28、drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts of the IEC 62153 series, 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 publication will remain unchanged until the
29、 maintenance result 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 may be issued at a later date. IMPORTANT
30、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 publication using a colour printer. 62153-4-11 IEC:2009(E) 5 METALLIC COMMUNICATION CAB
31、LE TEST METHODS Part 4-11: Electromagnetic compatibility (EMC) Coupling attenuation or screening attenuation of patch cords, coaxial cable assemblies, pre-connectorized cables Absorbing clamp method 1 Scope This part of IEC 62153 details the method of test to determine the coupling attenuation and s
32、creening attenuation for patch cords, coaxial cable assemblies and pre-connectorized cables used in analogue and digital communication systems. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cit
33、ed applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050-726, International Electrotechnical Vocabulary Chapter 726: Transmission lines and waveguides IEC 61196-1, Coaxial communication cables Part 1: Generic specification Genera
34、l, definitions and requirements IEC 62153-4-5:2006, Metallic communication cables test methods Part 4-5: Electromagnetic compatibility (EMC) Coupling or screening attenuation Absorbing clamp method ITU-T Recommendation G.117:1996, Transmission aspects of unbalance about earth ITU-T Recommendation O.
35、9:1999, Measuring arrangements to assess the degree of unbalance about earth 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 60050-726 and IEC 61196-1 apply. In this document, the cords under test (patch cords, coaxial cable assemblies, pre- connecto
36、rized cables) are denoted patch cords. 4 Test method 4.1 Equipment 4.1.1 General See 5.1.1 of IEC 62153-4-5, and Figure 1 below. 6 62153-4-11 IEC:2009(E) For patch cord testing, two test head connecting hardware modules and extension cables are needed for measurement of a patch cord (see 4.1.3). The
37、 two test heads are denoted as near end test head and far end test head. 600 cm 10 cm 5 0 11 2 6 8 3 10 12 4 9 13 1 14 7 15 13 IEC 1468/09 Key 0 signal generator, output impedance Z 0 8 absorber (ferrite tube) of the clamp, operational attenuation 10 dB 1 patch cord under test, nominal characteristi
38、c impedance Z 1 9 absorber (or second clamp), operational attenuation 10 dB 2 outer circuit of patch cords under test, impedance Z 2 10 termination of the far end extension cable connected to patch cord under test 3 absorbing clamp, impedance Z 3 11 shield of signal generator and balun if needed for
39、 high dynamic range 4 measuring receiver 12 reflector plate 5 balun (if applicable) 13 extension cable connected through test head to patch cord under test 6 current transformer of the clamp 14 test head for termination of patch cord at near end 7 measuring receiver cable (use the same in measuremen
40、t and calibration) 15 test head for termination of patch cord at far end Figure 1 Measurement of surface wave at near end of patch cord 4.1.2 Balun requirements For measurement of balanced patch cords, a means for generating balanced signals shall be provided. If the generator is unbalanced, this ma
41、y be performed by the use of a balun or 180 power splitter. The minimum requirements for this device are specified in Table 1. 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 measurements. 6215
42、3-4-11 IEC:2009(E) 7 Table 1 Balun performance characteristics (30 MHz to 1 GHz) Parameter Value Impedance, primary a50 (unbalanced) Impedance, secondary b100 or 150 (balanced) Operational attenuation c(including matching pads if used) 10 dB Return loss, bi-directional 6 dB Power rating To accommoda
43、te the power of the generator and amplifier (if applicable) Output signal balance d 50 dB from 30 MHz to 100 MHz 30 dB from 100 MHz to 1 GHz aPrimary impedance may differ if necessary to accommodate analyzer outputs other than 50 . bBalanced outputs of the test baluns shall be matched to the nominal
44、 impedance of the balanced patch cord / cable pair. 100 shall be used for termination of 120 cabling. cThe operational attenuation of a balun shall be mathematically deduced from 3 operational attenuation measurements with 3 baluns back-to-back. dMeasured per ITU-T Recommendations G.117 and O.9. 4.1
45、.3 Test head and extension cable requirements Unscreened balanced test heads and extension cables shall be used for testing unscreened, balanced patch cords. Screened, balanced test heads and extension cables shall be used for testing screened, balanced patch cords. Unbalanced (coaxial) test heads a
46、nd extension cables shall be used for testing unbalanced patch cords. The electrical transmission performance including electromagnetic screening and unbalance attenuation of the test head connecting hardware and the extension cable shall be better or equal to the performance of the patch cord under
47、 test. The choice of the test head extension cable shall assure the minimum operational attenuation and reflection loss of the set-up possible. The extension cables shall have the same nominal characteristic impedance as the patch cables under test. Likewise, the velocity of propagation of the exten
48、sion cables shall correspond to the patch cable under test (same type of isolation, for example foamed or solid). The operational attenuation of the near end terminating cable including test heads and set up validation cord shall be less than 1 dB up to 100 MHz. The test head connecting hardware, th
49、e extension cables, the connection between the test head and the extension cable cables shall have a balance (when measuring balanced patch cords) and shall have a screen (when measuring screened patch cords) as good as possible. To further enhance the measurement sensitivity, the connection between the test head connecting hardware and the extension cable may be improved since it does not form part of the device under test. It is n
