BS EN 50289-1-14-2004 Communication cables - Specifications for test methods - Electrical test methods - Coupling attenuation or screening attenuation of connecting hardware《通信电缆 试.pdf

1、BRITISH STANDARD BS EN 50289-1-14:2004 Communication cables Specifications for test methods Part 1-14: Electrical test methods Coupling attenuation or screening attenuation of connecting hardware The European Standard EN 50289-1-14:2004 has the status of a British Standard ICS 33.120.10 BS EN 50289-

2、1-14:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 23 April 2004 BSI 23 April 2004 ISBN 0 580 43663 2 National foreword This British Standard is the official English language version of EN 50289-1-14:2004. The UK participation in its p

3、reparation was entrusted to Technical Committee EPL/46, Communication cables, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publicati

4、ons referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessa

5、ry provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpr

6、etation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 12, an inside back cover and a bac

7、k cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 50289-1-14 NORME EUROPENNE EUROPISCHE NORM March 2004 CENELEC European Committee for Electrotechnical Standardizati

8、on Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2004 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50289-1-14:2004 E

9、ICS 33.120.10 English version Communication cables Specifications for test methods Part 1-14: Electrical test methods Coupling attenuation or screening attenuation of connecting hardware Cbles de communication Spcifications des mthodes dessai Partie 1-14: Mthodes dessais lectriques Affaiblissement d

10、e couplage ou affaiblissement de blindage du matriel de connexion Kommunikationskabel Spezifikationen fr Prfverfahren Teil 1-14: Elektrische Prfverfahren - Kopplungsdmpfung oder Schirmdmpfung fr Verbindungstechnik This European Standard was approved by CENELEC on 2004-02-01. CENELEC members are boun

11、d 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 alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Ce

12、ntral 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 translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same

13、status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal

14、, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 50289-1-14:2004 - 2 - Foreword This European Standard was prepared by the Technical Committee CENELEC TC 46X, Communication cables. The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENEL

15、EC as EN 50289-1-14 on 2004-02-01. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2005-02-01 latest date by which the national standards conflicting with the EN have to be wi

16、thdrawn (dow) 2007-02-01 _ - 3 - EN 50289-1-14:2004 Contents 1 Scope4 2 Normative references4 3 Definitions4 4 Test method.4 4.1 Equipment.4 4.1.1 General4 4.1.2 Balun requirements .5 4.1.3 Test head and extension cable requirements .6 4.1.3.1 General requirements.6 4.1.3.2 Testing of one part of co

17、nnecting hardware.6 4.1.3.3 Testing of a mated pair of connecting hardware 7 4.2 Test sample7 4.2.1 Length of the extension cables7 4.2.2 Tested length.7 4.2.3 Preparation of extension cable and test head.7 4.2.4.1 Balanced connecting hardware 8 4.2.4.2 Multi-conductor connecting hardware.8 4.2.4.3

18、Coaxial connecting hardware .8 4.3 Calibration procedure .8 4.4 Test set-up8 4.4.1 General8 4.4.2 Test set-up verification 9 4.4.2.1 Determination of measurement sensitivity of the set-up 9 4.4.2.2 Verification of test set-up calibration 10 4.4.2.3 Pulling force on connecting hardware 10 4.5 Measuri

19、ng procedure10 5 Expression of test results 10 6 Test report.10 6.1 General.10 6.2 Evaluation of test results (informative) .10 Figure 1 - Measurement of surface wave at near end of connecting hardware .5 Figure 2 - Termination of extension cables 8 Figure 3 - Test set-up for a near end measurement

20、of connecting hardware 9 Figure 4 - Test set-up for a near end measurement of connecting hardware 9 Figure 5 - Typical measurement of screened connecting hardware 11 Figure 6 - Typical measurement of an unscreened balanced connecting hardware11 Figure 7 - Typical measurement of a screened balanced c

21、onnecting hardware12 Table 1 - Balun performance characteristics (30 MHz to 1 GHz).6 EN 50289-1-14:2004 - 4 - 1 Scope This Part 1-14 of EN 50289 details the method of test to determine the coupling attenuation or screening attenuation for connecting hardware used in analogue and digital communicatio

22、n systems. The test method details means to test one part of a connecting hardware (e. g. wall outlet or plug alone) as well as testing a mated pair of connecting hardware. It is to be read in conjunction with EN 50289-1-6. 2 Normative references The following referenced documents are indispensable

23、for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 50289-1-6 Communication cables Specification for test methods Part 1-6: Electrical test methods Ele

24、ctromagnetic performance EN 50290-1-2 1)Communication cables Part 1-2: Definitions 3 Definitions For the purposes of this European Standard, the definitions of EN 50290-1-2 and EN 50289-1-6 apply. In this document connecting hardware is defined as a complete connecting device including compensating

25、or matching networks (if any), connectors and cable terminations. 4 Test method 4.1 Equipment 4.1.1 General See EN 50289-1-6, subclause 9.2.1.1 and Figure 1 below. The connecting hardware under test shall be terminated using the termination method and a cable type for which it is constructed. If onl

26、y one part of the connecting hardware is under test, a test head shall be used to mate the part under test. 1)Under consideration. - 5 - EN 50289-1-14:2004 600 cm 10 cm 300 cm 5 cm 300 cm 5 cmKey 0 signal generator, output impedance Z 0 1 connecting hardware under test, nominal characteristic impeda

27、nce Z 1 2 outer circuit of connecting hardware under test, impedance Z 2 3 absorbing clamp, impedance Z 3 4 measuring receiver 5 balun (if applicable) 6 current transformer of the clamp 7 measuring receiver cable (use the same in measurement and calibration) 8 absorber (ferrite tube) of the clamp, o

28、perational attenuation 10 dB 9 absorber (or second clamp), operational attenuation 10 dB 10 termination of the far end extension cable terminating the connecting hardware 11 shield of signal generator and balun if needed for high dynamic range 12 reflector plate 13 extension cable terminating the co

29、nnecting hardware at far end 14 extension cable terminating the test head or connecting hardware at near end Figure 1 - Measurement of surface wave at near end of connecting hardware 4.1.2 Balun requirements For measurement of balanced connecting hardware, a means for generating balanced signals sha

30、ll be provided. 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. The attenuation of the balun shall be kept as low as possible because it will limit the dynamic range of the coupling

31、attenuation or screening attenuation measurements. EN 50289-1-14:2004 - 6 - Table 1 - Balun performance characteristics (30 MHz to 1 GHz) Parameter Value Impedance, primary 1)50 (unbalanced) Impedance, secondary 2)100 or 150 (balanced) Operational attenuation 4)(including matching pads if used) 10 d

32、B Return loss, bi-directional 6 dB Power rating To accommodate the power of the generator and amplifier (if applicable) Output signal balance 3) 50 dB from 30 MHz to 100 MHz 30 dB from 100 MHz to 1 GHz 1)Primary impedance may differ, if necessary, to accommodate analyzer outputs other than 50 . 2)Ba

33、lanced outputs of the test baluns shall be matched to the nominal impedance of the balanced terminating cable pair. 100 shall be used for termination of 120 cabling. 3)Measured per ITU-T Recommendations G.117 and O.9 4)The operational attenuation of a balun shall be mathematically deduced from 3 ope

34、rational attenuation measurements with 3 baluns back-to-back 4.1.3 Test head and extension cable requirements 4.1.3.1 General requirements Unscreened balanced test heads (if applicable) and extension cables shall be used for testing unscreened, balanced connecting hardware. Screened balanced test he

35、ads (if applicable) and extension cables shall be used for testing screened, balanced connecting hardware. Unbalanced (coaxial) test heads (if applicable) and extension cables shall be used for testing unbalanced connecting hardware. The electrical transmission performance including electromagnetic

36、screening and unbalance attenuation of the test head (if applicable) and the extension cable shall be better or equal to the performance of the connecting hardware under test. The choice of the extension cable should assure the minimum operational attenuation and reflection loss of the set-up possib

37、le. The extension cables shall have the same nominal characteristic impedance as the connecting hardware under test. The velocity of propagation for the two extension cables, terminating the connecting hardware, shall be similar (same type of insulation e. g. foamed or solid). The operational attenu

38、ation of the near end terminating cable including test head (if applicable) shall be less than 1 dB up to 100 MHz. The extension cables shall have a balance (when measuring balanced patch cords) and shall have a screen (when measuring screened patch cords) as good as possible. 4.1.3.2 Testing one pa

39、rt of connecting hardware Testing one part of connecting hardware requires a test head which mates the connecting hardware under test. - 7 - EN 50289-1-14:2004 The test head, the extension cable and the connection between test head and the extension cable shall have a balance or screening or balance

40、 and screening as good as can be obtained. To further enhance the measurement sensitivity the connection between the test head and the extension cable may be improved since it does not form part of the device under test. It is not allowed to improve the contact between the test head and the connecti

41、ng hardware under test. In addition it is not allowed to improve the connection between the connecting hardware under test and the extension cable, as this termination is part of the test. The measurement sensitivity shall be 6 dB better than the specified requirement limit for the connecting hardwa

42、re under test. See 4.4.2.1 for determination of the measurement sensitivity. In case of doubt regarding the interoperability between the test head and the connecting hardware under test, it is recommended to use the mating connecting hardware specified or advised by the supplier of the connecting ha

43、rdware under test. 4.1.3.3 Testing of a mated pair of connecting hardware Testing of a mated pair of connecting hardware is performed by terminating the connecting hardware with extension cables as defined in 4.1.1. No improvement of the terminations in excess of those specified by the manufacturer

44、are allowed as these terminations are parts of the test. For screened cables the far end termination could already be included into the test head. In that way the quality of the extension cable is not critical with respect to the test results. 4.1.4 Impedance matching When measuring connecting hardw

45、are with another characteristic impedance than the impedance of the test system, impedance matching is only required when the return loss is less than 10 dB. The error that is introduced by the mismatch is max. 0,5 dB and thus negligible compared to the typical accuracy of the absorbing clamp test m

46、ethod. 4.2 Test sample 4.2.1 Length of the extension cables The extension cable at the near end of the set-up (close to the reflector plate) shall be 4 m 0,1 m. The extension cable at the far end of the test set-up shall be 10 m 0,1 m. 4.2.2 Tested length The effective test length of the test specim

47、en is limited by the absorbing clamp and the ferrite tube, as shown in Figure 1. This length shall be 600 cm 10 cm. 4.2.3 Preparation of extension cable and test head The diameter of the extension cables must be selected to allow insertion in the bore of the absorbing clamp. When a special type of s

48、ocket interface is specified for termination of the connecting hardware such interface shall be used in the test head in question. EN 50289-1-14:2004 - 8 - 4.2.4.1 Balanced connecting hardware Differential and common mode termination is required for each pair at the far end of the extension cable, s

49、ee Figure 2. R 2 R 1 R 1 Signal pair Cable screenFigure 2 - Termination of extension cables The values of the R 1resistors shall be one half the nominal characteristic impedance of the extension cable. NOTE For 100 balanced cabling the common mode impedance will be equal to 25 when R 2 is short circuited. The common mode impedance of the termination may vary from 25 (R 2=0 ) to 100 (R 2=75 ). In case of screened cabl