BS EN 50289-1-13-2004 Communication cables - Specifications for test methods - Electrical test methods - Coupling attenuation or screening attenuation of patch cords coaxial cable .pdf

1、BRITISH STANDARD BS EN 50289-1-13:2004 Communication cables Specifications for test methods Part 1-13: Electrical test methods Coupling attenuation or screening attenuation of patch cords/coaxial cable assemblies/pre-connectorised cables The European Standard EN 50289-1-13:2004 has the status of a B

2、ritish Standard ICS 33.120.10 BS EN 50289-1-13:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 14 April 2004 BSI 14 April 2004 ISBN 0 580 43650 0 National foreword This British Standard is the official English language version of EN 5028

3、9-1-13:2004. The UK participation in its preparation 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 imp

4、lement international or European publications 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 d

5、oes not purport to include all the necessary 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/Europ

6、ean committee any enquiries on the interpretation, 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, pag

7、es 2 to 13, an inside back cover and a back 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 50289-1-13 NORME EUROPENNE EUROPISCHE NORM March 2004 CENELEC European Co

8、mmittee for Electrotechnical Standardization 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 CENEL

9、EC members. Ref. No. EN 50289-1-13:2004 E ICS 33.120.10 English version Communication cables Specifications for test methods Part 1-13: Electrical test methods Coupling attenuation or screening attenuation of patch cords / coaxial cable assemblies / pre-connectorised cables Cbles de communication Sp

10、cifications des mthodes dessai Partie 1-13: Mthodes dessais lectriques Affaiblissement de couplage ou affaiblissement de blindage des cordons de raccordement / des ensembles de cbles coaxiaux / des cbles pr-connecteurs Kommunikationskabel Spezifikationen fr Prfverfahren Teil 1-13: Elektrische Prfver

11、fahren Kopplungsdmpfung oder Schirmdmpfung fr Rangierschnre, koaxiale konfektionierte Kabel, konfektionierte Kabel This European Standard was approved by CENELEC on 2004-02-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving thi

12、s 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 Central Secretariat or to any CENELEC member. This European Standard exists in three official version

13、s (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 status as the official versions. CENELEC members are the national electrotechnical committees of Au

14、stria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 50289-1-13:2004 2 Foreword

15、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 CENELEC as EN 50289-1-13 on 2004-02-01. The following dates were fixed: - latest date by which the EN has to

16、 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 withdrawn (dow) 2007-02-01 _ 3 EN 50289-1-13:2004 Contents 1 Scope. 4 2 Normative references4 3 Defin

17、itions 4 4 Test method . 4 4.1 Equipment . 4 4.1.1 General . 4 4.1.2 Balun requirements 5 4.1.3 Test head and extension cable requirements 6 4.1.4 Impedance matching 7 4.2 Test sample. 7 4.2.1 Length of the patch cords under test 7 4.2.1.1 Single ended patch cords 7 4.2.1.2 Double ended patch cords.

18、 7 4.2.2 Length of extension cables connected to patch cord under test 7 4.2.3 Tested length. 7 4.2.4 Preparation of extension cable and test head . 7 4.2.4.1 Balanced patch cords 7 4.2.4.2 Multi-conductor patch cords. 8 4.2.4.3 Coaxial patch cords. 8 4.3 Calibration procedure 8 4.4 Test set-up 8 4.

19、4.1 General . 8 4.4.2 Test set-up verification. 10 4.4.1.1 Determination of measurement sensitivity of the set-up 10 4.4.1.2 Verification of test set-up calibration 11 4.4.1.3 Pulling force on patch cords 11 4.5 Measuring procedure. 11 5 Expression of test results 11 6 Test report 12 6.1 General . 1

20、2 6.2 Evaluation of test results (informative) . 12 Figure 1 Measurement of surface wa ve at near end of patch cord .5 Figure 2 Termination of extension cables.8 Figure 3 Test set-up for a near end meas urement of a double ended patch cord 9 Figure 4 Test set-up for a near end meas urement of a sing

21、le ended patch cord .9 Figure 5 Test set-up for a near end meas urement of a double ended patch cord 10 Figure 6 Validation test set-up 11 Figure 7 Typical measurement of an unscreened balanced patch cord 13 Figure 8 Typical measurement of a screened balanced patch cord 13 Table 1 Balun performance

22、charac teristics (30 MHz to 1 GHz) .6 EN 50289-1-13:2004 4 1 Scope This Part 1-13 of EN 50289 details the method of test to determine the coupling attenuation or screening attenuation for patch cords, coaxial cable assemblies and pre-connectorised cables used in analogue and digital communication sy

23、stems. It is to be read in conjunction with EN 50289-1-6. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (inc

24、luding any amendments) applies. EN 50289-1-6 Communication cables Specifications for test methods Part 1-6: Electrical test methods Electromagnetic 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 50

25、290-1-2 and EN 50289-1-6 apply. In this document the cords under test (patch cords, coaxial cable assemblies, pre-connectorised cables) are denoted patch cords. 4 Test method 4.1 Equipment 4.1.1 General See EN 50289-1-6, subclause 9.2.1.1 and Figure 1 below. For patch cord testing two test head conn

26、ecting hardware modules and extension cables are needed for measurement of a patch cord (see 4.1.3). The two test heads are denoted near end test head and far end test head. 1)Under consideration. 5 EN 50289-1-13:2004 600 cm 10 cmKey 0 signal generator, output impedance Z 0 8 absorber (ferrite tube)

27、 of the clamp, operational attenuation 10 dB 1 patch cord under test, nominal characteristic 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

28、test 3 absorbing clamp, impedance Z 3 11 shield of signal generator and balun if needed for 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 t

29、ermination of patch cord at near end 7 measuring receiver cable (use the same in measurement 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

30、 for generating balanced signals shall 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 limi

31、t the dynamic range of the coupling attenuation or screening attenuation measurements. EN 50289-1-13:2004 6 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

32、matching pads if used) 10 dB Return loss, bi-directional 6 dB Power rating To accommodate 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 outpu

33、ts other than 50 . bBalanced outputs of the test baluns shall be matched to the nominal 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 measurem

34、ents with 3 baluns back-to-back. dMeasured per ITU-T Recommendations G.117 and O.9. 4.1.3 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 shal

35、l be used for testing screened, balanced patch cords. Unbalanced (coaxial) test heads and 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

36、the extension cable shall be better or equal to the performance of the patch cord under 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 imped

37、ance as the patch cables under test. Likewise the velocity of propagation of the extension cables shall correspond to the patch cable under test (same type of isolation e.g. foamed or solid). The operational attenuation of the near end terminating cable including test heads and set up validation cor

38、d shall be less than 1 dB up to 100 MHz. The test head connecting hardware, the 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 po

39、ssible. 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 not allowed to improve the contact from the plug of the patch cord under test to the tes

40、t heads used. The measurement sensitivity shall be 6 dB better than the specified requirement limit for the patch cord under test. See 4.4.2.1 for determination of the measurement sensitivity. In case of doubt regarding the interoperability between the test head connecting hardware and the plug of t

41、he patch cord under test, it is recommended to use the connecting hardware specified or advised by the supplier of the patch cord under 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

42、respect to the test results. 7 EN 50289-1-13:2004 4.1.4 Impedance matching When measuring patch cords 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

43、 is max. 0,5 dB and thus negligible compared to the typical accuracy of the absorbing clamp test method. 4.2 Test sample 4.2.1 Length of the patch cords under test 4.2.1.1 Single ended patch cords The minimum length of the patch cord under test shall be 1 m. 4.2.1.2 Double ended patch cords In case

44、of a double ended patch cord (a patch cord with two connectors) any length of cord can be measured. If the cord is longer than 6 m, only one connector will be within the tested length of the set-up (see 4.2.3). In this case the test result will be showing higher values. 4.2.2 Length of extension cab

45、les connected to patch cord under test The length of the extension cables, which terminates the test heads are: A: Extension cable at reflector plate (near end) The length of the extension cable between the reflector plate and the near end test head shall be 100 cm 10 cm. B: Extension cable in termi

46、nation end (far end) The entire length of the far end extension cable shall be 10 m 0,5 m. 4.2.3 Tested length The effective test length of the test specimen is limited by the absorbing clamp and the ferrite tube, as shown in Figure 1. This length shall be 600 cm 10 cm. 4.2.4 Preparation of extensio

47、n 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 socket interface is specified for termination of the patch cord such interface shall be used in the test head in question. 4.2.4.1 Balanced patch

48、cords Differential and common mode termination is required for each pair at the far end of the extension cable, see Figure 2. EN 50289-1-13:2004 8 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

49、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 cables the terminating resistors shall be screened. The centre taps of the terminations shall be connected togeth