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1、BRITISH STANDARD BS EN 62153-4-7:2006 Metallic communication cables test methods Part 47: Electromagnetic compatibility (EMC) Test method for measuring the transfer impedance and the screening or the coupling attenuation Tube in tube method The European Standard EN 62153-4-7:2006 has the status of a
2、 British Standard ICS 33.120.10; 33.100 ? BS EN 62153-4-7:2006 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2006 BSI 2006 ISBN 0 580 49312 1 National foreword This British Standard was published by BSI. It is the UK implementati
3、on of EN 62153-4-7:2006. It is identical with IEC 62153-4-7:2006. The UK participation in its preparation was entrusted to Technical Committee EPL/46, Cables, wires and waveguides, radio frequency connectors and accessories for communication and signalling. A list of organizations represented on EPL
4、/46 can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publi
5、cation Amd. No. DateComments EUROPEAN STANDARD EN 62153-4-7 NORME EUROPENNE EUROPISCHE NORM August 2006 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassar
6、t 35, B - 1050 Brussels 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 62153-4-7:2006 E ICS 33.120.10; 33.100 English version Metallic communication cables test methods Part 4-7: Electromagnetic compatibility (EMC) - Test me
7、thod for measuring the transfer impedance and the screening - or the coupling attenuation - Tube in tube method (IEC 62153-4-7:2006) Mthodes dessai des cbles mtalliques de communication Partie 4-7: Compatibilit lectromagntique (CEM) - Mthode dessai pour mesurer limpdance de transfert et laffaiblisse
8、ment dcran - ou laffaiblissement de couplage - Mthode des tubes concentriques (CEI 62153-4-7:2006) Prfverfahren fr metallische Kommunikationskabel Teil 4-7: Elektromagnetische Vertrglichkeit (EMV) - Messverfahren zur Messung der Kopplungswiderstandes und der Schirmung - oder der Kopplungsdmpfung - R
9、ohr-im-Rohr-Verfahren (IEC 62153-4-7:2006) This European Standard was approved by CENELEC on 2006-08-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any altera
10、tion. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by tra
11、nslation 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, Cyprus, the Czech Republic, Denmark, Estonia, Finland, F
12、rance, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 62153-4-7:2006 2 Foreword The text of the International Standard IEC 62153-4-7
13、:2006, prepared by SC 46A, Coaxial cables, of IEC TC 46, Cables, wires, waveguides, R.F. connectors, R.F. and microwave passive components and accessories, was submitted to the formal vote and was approved by CENELEC as EN 62153-4-7 on 2006-08-01 without any modification. The following dates were fi
14、xed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2007-08-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2009-08-01 Annex ZA has been added by CENELEC. _
15、 Endorsement notice The text of the International Standard IEC 62153-4-7:2006 was approved by CENELEC as a European Standard without any modification. _ 3 EN 62153-4-7:2006 CONTENTS INTRODUCTION.5 1 Scope 6 2 Normative references .6 3 Terms and definitions .6 4 Principle of the test method 8 5 Theor
16、etical background 10 6 Procedure 10 6.1 Equipment.10 6.2 Connection between extension tube device under test10 6.3 Dynamic range respectively noise floor 11 6.4 Impedance of the inner system 11 6.5 Sample preparation .14 7 Measurement .15 7.1 Transfer impedance.15 7.2 Screening attenuation16 7.3 Cou
17、pling attenuation16 8 Expression of results 17 8.1 Transfer impedance and effective transfer impedance 17 8.2 Screening attenuation17 8.3 Coupling attenuation18 8.4 Requirement19 Annex A (informative) Measurements of the screening effectiveness of connectors and cable assemblies 20 Annex B (informat
18、ive) Influence of contact resistances 31 Annex ZA (normative) Normative references to international publications with their corresponding European publications34 Bibliography .33 Figure 1 Definition of ZT.7 Figure 2 Principle of the test set-up to measure transfer impedances and screening or couplin
19、g attenuation of connectors9 Figure 3 Principle of the test set-up to measure transfer impedances and screening attenuation of short cable assemblies9 Figure 4 Principle set-up for verification test.11 Figure 5 Impedance matching for Z1 50 13 Figure 7a Principle preparation of balanced or multicondu
20、ctor connectors for transfer impedance and screening attenuation .14 Figure 7b Principle preparation of balanced or multiconductor connectors for coupling attenuation15 Figure 7 Preparation of balanced or multiconductor connectors.15 EN 62153-4-7:2006 4 Figure 8 Measuring the transfer impedance with
21、 tube in tube15 Figure 9 Measuring the screening attenuation with tube in tube 16 Figure 10 Measuring the coupling attenuation with tube in tube.17 Figure 11 Typical measurement of a connector of 0,04 m length with 1 m extension tube 19 Figure A.1 Equivalent circuit of coupled transmission lines21 F
22、igure A.2 Summing function S22 Figure A.3 Calculated coupling transfer function (l = 1 m; er1 = 2,3; er2 = 1; ZF = 0) 23 Figure A.4 Triaxial set-up for the measurement of the screening attenuation aS and the transfer impedance ZT.25 Figure A.5 Simulation of a cable assembly (logarithmic scale).26 Fi
23、gure A.6 Simulation of a cable assembly (linear scale).26 Figure A.7 Triaxial set-up with extension tube for short cable assemblies27 Figure A.8 Triaxial set-up with extension tube for connectors28 Figure A.9 Simulation, logarithmic frequency scale 29 Figure A.10 Measurement, logarithmic frequency s
24、cale29 Figure A.11 Simulation, linear frequency scale.29 Figure A.12 Measurement, linear frequency scale29 Figure A.13 Simulation, logarithmic frequency scale 29 Figure A.14 simulation, linear frequency scale .29 Figure B.1 Contact resistances of the test set-up31 Figure B.2 Equivalent circuit of th
25、e test set-up32 5 EN 62153-4-7:2006 INTRODUCTION The shielded screening attenuation test set-up according to IEC 62153-4-4 (triaxial method) has been extended to take into account the particularities of electrical short elements like connectors and cable assemblies. Due to the concentric outer tube
26、of the triaxial set-up, measurements are independent of irregularities on the circumference and outer electromagnetic fields. With the use of an additional resonator tube (inner tube respectively tube in tube) a system is created where the screening effectiveness of an electrically short device is m
27、easured in realistic and controlled conditions. Also a lower cut off frequency for the transition between electrically short (transfer impedance ZT) and electrically long (screening attenuation as) can be achieved. A wide dynamic and frequency range can be applied to test even super screened connect
28、ors and assemblies with normal instrumentation from low frequencies up to the limit of defined transversal waves in the outer circuit at approximately 4 GHz. EN 62153-4-7:2006 6 METALLIC COMMUNICATION CABLE TEST METHODS Part 4-7: Electromagnetic compatibility (EMC) Test method for measuring the tran
29、sfer impedance and the screening or the coupling attenuation Tube in tube method 1 Scope This triaxial method is suitable to determine the surface transfer impedance and/or screening attenuation and coupling attenuation of mated screened connectors (including the connection between cable and connect
30、or) and cable assemblies. This method could also be extended to determine the transfer impedance, coupling or screening attenuation of balanced or multipin connectors and cable assemblies. 2 Normative references The following referenced documents are indispensable for the application of this documen
31、t. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 61196-1:2005, Coaxial communication cables Part 1: Generic specification General, definitions and requirements IEC 62153-4-4, Metalli
32、c communication cable test methods Part 4-4: Electromagnetic compatibility (EMC) Shielded screening attenuation, test method for measuring of the screening attenuation as up to and above 3 GHz1 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1
33、surface transfer impedance Z T for an electrically short screen, quotient of the longitudinal voltage U1 induced to the inner circuit by the current I2 fed into the outer circuit or vice versa (see Figure 1) The value ZT of an electrically short screen is expressed in ohms or decibels in relation to
34、 1 . 1 To be published 7 EN 62153-4-7:2006 U1 l l or r1 o 10 l c f (7) where l is the effective coupling length in m; o is the free space wave length in m; r1 is the resulting relative permittivity of the dielectric of the cable; r2 is the resulting relative permittivity of the dielectric of the sec
35、ondary circuit; f is frequency in Hz; co is the velocity of light in free space. 3.6 device under test device consisting of the mated connectors with their attached cables 4 Principle of the test method Usually RF connectors have mechanical dimensions in the longitudinal axis in the range of 20 mm t
36、o maximum 50 mm. With the definition of electrical short elements we get cut off or corner frequencies or corner for the transition between electrically short and long elements of about 1 GHz or higher for usual RF-connectors. In the frequency range up to the cut off frequency, where the device unde
37、r test (DUT) is electrically short, the transfer impedance of the DUT can be measured. For frequencies above the cut-off frequency, where the DUT is electrically long, the screening attenuation can be measured. 9 EN 62153-4-7:2006 By extending the electrically length of the RF-connector by a RF-tigh
38、tly closed metallic extension tube (tube in tube), the tested combination becomes electrically long and the cut-off frequency is moved towards the lower frequency range. In this way, also in the lower frequency range, the screening attenuation may be measured and the effective transfer impedance of
39、electrical short devices calculated. The test set up is a triaxial system consisting of the DUT, a solid metallic tube and a RF-tight extension tube. The matched device under test, DUT, which is fed by a generator forms the disturbing circuit which may also be designated as the inner or the primary
40、circuit. The disturbed circuit, which may also be designated as the outer or the second circuit, is formed by the outer conductor of the device under test, connected to the extension tube and a solid metallic tube having the DUT under test in its axis. The principle of the test set-up is shown in Fi
41、gure 2 and Figure 3. The set-up is the same for measuring the transfer impedance and the screening attenuation or the coupling attenuation, where the length of the inner and the outer tube may vary. Generator Measuring tube Connector under test Receiver Extension tube Connecting cable Screening cap
42、IEC 599/06 Figure 2 Principle of the test set-up to measure transfer impedances and screening or coupling attenuation of connectors Measuring tube Assembly under test Extension tube, variable length Connecting cable Screening cap Generator Connector interface Receiver IEC 600/06 Figure 3 Principle o
43、f the test set-up to measure transfer impedances and screening attenuation of short cable assemblies EN 62153-4-7:2006 10 The voltage ratio of the voltage at the near end (U1) of the inner circuit (generator) and the voltage at the far end (U2) of the secondary circuit (receiver) shall be measured (
44、U1/U2). The near end of the secondary circuit is short-circuited. Depending on the electrical length of the the tested combination, the DUT and the extension tube, the result may be expressed either by the transfer impedance, the effective transfer impedance or the screening attenuation (or the coup
45、ling attenuation). For this measurement, a matched receiver is not necessary. The likely voltage peaks at the far end are not dependant on the input impedance of the receiver, provided that it is lower than the characteristic impedance of the secondary circuit. However, it is an advantage to have a
46、low mismatch, for example by selecting a range of tube diameters for several sizes of coaxial cables. 5 Theoretical background See Annex A. 6 Procedure 6.1 Equipment The principle of the test set-up is shown in Figure 2 and 3 and consists of: an apparatus of a triple coaxial form with a length suffi
47、cient to produce a superimposition of waves in narrow frequency bands which enable the envelope curve to be drawn, variable length of the tube, e.g. by different parts of the tube and/or by a movable tube in tube, a RF-tight extension tube, variable in length, which should preferably have a diameter
48、 such that the characteristic impedance to the outer tube is 50 or the nominal impedance of the network analyser or generator and receiver, the material of the extension tube shall be non ferromagnetic and well conductive (copper or brass) and shall have a thickness 1 mm such that the transfer impedance is negligible compared to the transfer impedance of the device under test, a signal generator with the same characteristic impedance as the cable under test or with an impedance adapter, completed by a power amplifier if necessary for very high screening attenuation, a balun with