BS EN 50289-1-16-2007 Communication cables - Specifications for test methods - Electromagnetic performance - Coupling attenuation of cable assemblies (field conditions)《通信电缆 试验方法规范.pdf

1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Part 1-16: Electromagnetic performance Coupling attenuation of cable assemblies (Field conditions)T

2、he European Standard EN 50289-1-16:2007 has the status of a British StandardICS 33.120.10Communication cables Specifications for test methods BRITISH STANDARDBS EN 50289-1-16:2007BS EN 50289-1-16:2007This British Standard was published under the authority of the Standards Policy and Strategy Committ

3、ee on 31 May 2007 BSI 2007ISBN 978 0 580 50756 4Amendments issued since publicationAmd. No. Date CommentsThis 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 immunit

4、y from legal obligations.National forewordThis British Standard was published by BSI. It is the UK implementation of EN 50289-1-16:2007. The UK participation in its preparation was entrusted to Technical Committee EPL/46, Cables, wires and waveguides, radio frequency connectors and accessories for c

5、ommunication and signalling.A list of organizations represented on this committee can be obtained on request to its secretary.EUROPEAN STANDARD EN 50289-1-16 NORME EUROPENNE EUROPISCHE NORM April 2007 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Elec

6、trotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50289-1-16:2007 E ICS 33.120.10 English version Communic

7、ation cables - Specifications for test methods - Part 1-16: Electromagnetic performance - Coupling attenuation of cable assemblies (Field conditions) Cbles de communication - Spcifications des mthodes dessai - Partie 1-16: Performance lectromagntique - Affaiblissement de couplage des cbles quips (Co

8、nditions de terrain) Kommunikationskabel - Spezifikationen fr Prfverfahren - Teil 1-16: Elektromagnetisches Verhalten - Kopplungsdmpfung fr konfektionierte Kabel unter Feldbedingungen This European Standard was approved by CENELEC on 2006-11-01. CENELEC members are bound to comply with the CEN/CENEL

9、EC 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 Central Secretariat or to any CE

10、NELEC 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 status as the official version

11、s. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, S

12、lovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 50289-1-16:2007 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 formal vote and was approved by CENELEC as EN 50289-1-16

13、 on 2006-11-01. 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) 2007-11-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2009-

14、11-01 _ 3 EN 50289-1-16:2007 Contents 1 Scope4 2 Normative references4 3 Definitions4 4 Test method.4 4.1 Equipment.4 4.1.1 General .4 4.1.2 Balun requirements.5 4.1.3 Extension cable requirements6 4.2 Test sample 7 4.2.1 General .7 4.2.2 Tested length .7 4.2.3 Preparation of test sample 7 4.3 Calib

15、ration procedure.8 4.4 Test set-up9 4.4.1 General .9 4.4.2 Test set-up verification .9 4.5 Measuring procedure .10 4.5.1 Example of link measurement10 5 Expression of test results11 6 Test report .11 6.1 General.11 6.2 Evaluation of test results (informative) 12 Bibliography .15 Figures Figure 1 Mea

16、surement of surface wave in one end of a link or channel5 Figure 2 Termination of link or channel or applied extension cable 8 Figure 3 Example of a three-connector link configuration as defined in EN 50173-110 Figure 4 Wall outlet end measurement 11 Figure 5 Typical measurement of an unscreened cha

17、nnel Coupling attenuation, A is 43 dB12 Figure 6 Typical measurement of a screened balanced channel Coupling attenuation, A is 57 dB13 Figure 7 Double wall outlet port right (without connected screen) Coupling attenuation, A is 44,8 dB.13 Figure 8 Double wall outlet port left (with connected screen)

18、 Coupling attenuation, A is 61,5 dB .14 Table Table 1 Balun performance characteristics 6 EN 50289-1-16:2007 4 1 Scope This part of EN 50289-1 details the method of in field test to determine the coupling attenuation for installed links and channels used in analogue and digital communication systems

19、. It is to be read in conjunction with EN 50289-1-6 and EN 50289-1-15. 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 coupling attenuat

20、ion of installed links and channels is dependant 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 This method cann

21、ot be used for verification of compliance with emission and immunity EMC standards for the complete system including active components 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applie

22、s. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 50290-1-2 Communication cables Part 1-2: Definitions EN 50289-1-6 Communication cables Specifications for test methods Part 1-6: Electrical test methods Electromagnetic performance EN 5028

23、9-1-15 Communication cables Specifications for test methods Part 1-15: Electromagnetic performance Coupling attenuation of links and channels (Laboratory conditions) 3 Definitions For the purposes of this document, the definitions of EN 50290-1-2 and EN 50289-1-6 apply. 4 Test method 4.1 Equipment 4

24、.1.1 General The field test equipment 1)shall be able to measure coupling attenuation according to the principle defined in EN 50289-1-6 (see also Subclause 5.3). See EN 50289-1-6, Subclause 9.2.1.1, and Figure 1 below. 1)Instead of signal generator and measuring receiver or network analyser a spect

25、rum analyser with tracking generator can be used, which is available as a field test equipment. 5 EN 50289-1-16:2007 Key 1 signal generator, output impedance Z02 balun (if applicable). 3 screen of signal generator and balun if needed for high dynamic range 4 reflector plate, minimum size 0,2 m x 0,2

26、 m 5 absorbing clamp 6 absorber (ferrite tube) of the clamp, insertion loss 10 dB 2)7 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

27、 in measured end of link or channel 12 link or channel under test 13 load termination of far end of link or channel under test Figure 1 Measurement of surface wave in one end of a link or channel 4.1.2 Balun requirements For measurement of symmetrical links or channels, a means for generating symmet

28、rical 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 limit the dynamic range

29、 of the coupling attenuation or screening attenuation measurements. 2)There is no requirement for an absorber in the far end. EN 50289-1-16:2007 6 Table 1 Balun performance characteristics Parameter Value Impedance, primarya50 (unbalanced) Impedance, secondary b100 or 150 (balanced) Operational atte

30、nuation d(including 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 balancec 50 dB from 30 MHz to 100 MHz 30 dB from 100 MHz to the highest measured frequency. aPrimary impedance may diff

31、er if necessary to accommodate analyzer outputs other than 50 . bBalanced outputs of the test baluns shall be matched to the nominal impedance 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. d The operat

32、ional attenuation of a balun shall be mathematically deduced from 3 operational attenuation measurements with 3 baluns back-to-back. 4.1.3 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 s

33、et-up. The length of the extension cable shall be 2 m 0,1 m. Unscreened extension cables shall be used for testing unscreened, balanced link or channels. Screened, balanced extension cables shall be used for testing screened, balanced links or channels. Coaxial extension cables shall be used for tes

34、ting coaxial links or channels. The electrical transmission performance including electromagnetic screening and unbalance attenuation 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 pos

35、sible insertion loss and reflection loss of the set-up. The extension cables shall have the same nominal characteristic impedance as 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 co

36、nnector, 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 and screening as good as possible

37、, because its quality may have an impact on the test results. To further enhance the measurement sensitivity the connection between the mating connector and the extension cable may be improved since it does not form part of the device under test. It is not allowed to improve any contact between the

38、connecting hardware of the link or channel under test and the mating connector of the extension cable, if applicable. The measurement sensitivity shall be 6 dB better than the specified requirement limit for the link or channel under test. See 5.4.2.1 for determination of the measurement sensitivity

39、. 7 EN 50289-1-16:2007 In case of doubt regarding the interoperability between any mating connector and the connecting hardware of the link or channel under test, it is recommended to use the mating connector specified or advised by the supplier of the connecting hardware of the link or channel unde

40、r test. 4.2 Test sample 4.2.1 General The test sample consists of the link or channel under test, an extension cable (if applicable), and a far end termination. In the near end an extension cable is used to connect the link or channel with the balun (if applicable), network analyzer or signal genera

41、tor. In the far end a suitable connecting hardware with build in resistor terminations is used for termination of the link or channel under test. The sample therefore consists of one extension cable with mating connector in the near end of the link or channel under test, if applicable, one connectin

42、g hardware with build in resistor terminations. If the link or channel under test is unscreened, the connecting hardware shall be unscreened. The termination resistors shall be mounted as close to the connecting hardware as possible and mounted in order to maintain good balance properties. If the li

43、nk or channel under test is screened, the connecting hardware shall be screened. The resistor terminations shall be mounted in a screen, which is integrated with the connector screen, an installed link or channel under test. 4.2.2 Tested length The effective test length of each measurement is determ

44、ined by the length of the link or channel under test. 4.2.3 Preparation of test sample The diameter of any 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 link or channel such interfa

45、ce shall be used in the mating connector in question. The bore of the absorbing clamp shall be larger than the diameter of the cables of the measured parts of the link or channel under test. 4.2.3.1 Balanced links or channels Differential and common mode terminations are required for each unmeasured

46、 pair at the near end of the link or channel or any applied extension cable, see Figure 2. Differential and common mode terminations are required for each pair at the far end of the link or channel, see Figure 2. EN 50289-1-16:2007 8 Signal pair Cable screen (if applicable) R 1 R 1 R 2 Figure 2 Term

47、ination of link or channel or applied extension cable The values of the R1resistors shall be one half the nominal characteristic impedance of the cable(s) of the link or channel. In case of screened cables the terminating resistors shall be screened and R2shall be equal to 0 3). In case of unscreene

48、d cables the terminating resistor R2shall be equal to 25 3). The centre taps of the terminations shall be connected together. In the case of screened cables the centre taps shall be connected to the screens. 4.2.3.2 Multi-conductor links or channels ffs 4.2.3.3 Combined balanced and coaxial links or

49、 channels The balanced link or channel end shall be connected to balanced test equipment or terminations. The coaxial link or channel end shall be connected to unbalanced test equipment or terminations. 4.2.3.4 Coaxial links and channels The far end shall be terminated with its nominal characteristic impedance. 4.3 Calibration procedure Calibration shall be performed according to EN 50289-1-6, Subclause 9.2.