1、T BRITISH STANDARD Communication cables - Specifications for test methods - Part 1-7: Electrical test methods - Velocity of propagation The European Standard EN 50289-1-7:2001 has the status of a British Standard ICs 33.120.10 BS EN 5 O 2 8 9-1 -7 : 2 O O 1 O NO COPYING WITHOUT BSI PERMISSION EXCEPT
2、 AS PERMIED BY COPYRIGHT LAW National foreword Amd. No. BS EN 50289-1-7:2001 Date Comments This British Standard, having been prepared under the direction of the Electrotechnical Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 September 2001
3、 This British Standard is the official English language version of The UK participation in its preparation was entrusted by Technical Committee EPU46, Cables, wire and waveguides, RF connectors and accessories for communication and signalling, to Subcommittee EPL146/1, Communication cables, which ha
4、s the responsibility to: EN 50289-1-7:2001. - - aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate
5、 them in the UK. - A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the se
6、ction entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct applicatio
7、n. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 9 and a back cover. The BSI copyright date displayed in this document indicates when the docum
8、ent was last issued. Amendments issued since publication O BSI 08-2001 ISBN O 580 38300 8 EN 50289-1-7 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM June 2001 ICs 33.120.20 English version Communication cables - Specifications for test methods Part 1-7: Electrical test methods - Velocity of prop
9、agation Cbles de communication - Kommunikationskabel - Spcifications des mthodes dessai Partie 1-7: Mthodes dessais lectriques - Vitesse de propagation Ausbreitungsgeschwindigkeit Spezifikationen fr Prfverfahren Teil 1-7: Elektrische Prfverfahren - This European Standard was approved by CENELEC on 2
10、001-03-01. CENELEC members are bound to comply with the CENICENELEC 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 b
11、e 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 translation under the responsibility of a CENELEC member into its own language and notified to th
12、e Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerl
13、and and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 0 2001 CENELEC - Ali rights of exploitation in any form
14、and by any means reserved worldwide for CENELEC members. Ref. No. EN 50289-1-7:2001 E EN 50289-1 -712001 -2- Foreword This European Standard was prepared by SC 46XC, Multicore, Multipair and Quad Data communication cables, of Technical Committee CENELEC TC 46X, Communication cables. The text of the
15、draft was submitted to the formal vote and was approved by CENELEC as EN 50289-1-7 on 2001-03-01. 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) 2002-04-01 - latest date by
16、 which the national standards conflicting with the EN have to be withdrawn (dow) 2004-04-01 This European Standard has been prepared under the European Mandate M1212 given to CENELEC by the European Commission and the European Free Trade Association. EN 50289-1-7:2001 Contents Foreword i 1 Scope . 4
17、 2 Normative references 4 3 Definitions 4 4 Test method 6 4.1 Equipment 6 4.2 Test sample 6 4.3 Procedure . 6 4.3.1 Calibration procedure 6 O 4.3.2Measuring procedure . 6 5 Expression of test results . 7 5.1 Phase measurement 7 5.2 Calculation of velocity of propagation 8 5.3 Resonance method . 9 6
18、Test report 9 EN 50289-1-7:2001 -4- 1 Scope Part 1-7 of EN 50289 details the test methods to determine the velocity of propagation of the finished cables used in analogue and digital communication systems. It is to be read in conjunction with Part 1-1 of EN 50289, which contains essential provisions
19、 for its application. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent a
20、mendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to a p pl i es (i n cl u d i n g am end m e n ts) . EN 50289-1-1 2001 Communication cabl
21、es - Specifications for tests methods - Part 1-1: Electrical test methods - General requirements EN 50289-1-1 1 2001 Communication cables - Specifications for test methods - Part 1-1 1: Electrical test methods - Characteristic impedance, input impedance, return loss EN 50290-1 -2“ - Communication ca
22、bles - Part 1-2: Definitions 3 Definitions For the purpose of this European Standard, the definitions of EN 50290-1-2 apply in addition to the following ones. 3.1 velocity of propagation Phase velocity The phase velocity of propagation, vpi as defined in EN 50290-1-2, is derived from the measurement
23、 of the phase constant at known frequencies: f vp =2xnx- P ) At draft stage -5- EN 50289-1-7:2001 Group velocity The group velocity of propagation, vg, as defined in EN 50290-1-2, is derived from the measurement of the phase constant at known frequencies: df Af f2-fl vg =2xnx-2xnx-=2x7rx- d A 2 - l
24、where v = velocity of propagation in m/s; vg = group velocity of propagation in m/s; vp = phase velocity of propagation in m/s; f = frequency, where f2 fi; = phase constant in radians/m at frequency f2 and fi may be either derived from a transmission measurement as indicated below or from an openkho
25、rt circuit measurement as explained in EN 50289-1-1 1. 0.L = Phase (1-1) K=K+1 Phase (I)=Phase (I)-Kx2a END While NEXT I 5.2 Calculation of velocity of propagation The velocity of propagation shall be calculated as follows taking into account the calibration : where fmax then fi = fmin then f2 = fma
26、x where fmin I fma = lowestlhighest measured frequency - fmin - fstafi + Afl2; (9) -9- EN 50289-1-7:2001 - fm, - fstopt - Af/2; vg = velocity of propagation at Frequency f; = phase constant. 5.3 Resonance method The frequencies f, and f, where f, is the frequency of the minimum voltage (maximum impe
27、dance) at the near end of a short-circuited cable and f, is the frequency of the maximum voltage (minimum impedance) of an open circuited cable are measured according to open/short method as described in EN 50289-1-11. The frequency of the first maximum or minimum is designated fclol, the second fsl
28、o2, etc. The propagation time Tpn at the nth resonance (frequency felon) is given by the formula 2n -1 Tpn =- 4 fdon The phase velocity of propagation is calculated using the following formula: vp = L/Tp where L is the physical length of the cable in meter. NOTE The electrical length of the coupling
29、 device and the adapter should be taken into account. The accuracy can be improved by taking the mean values : fn = (f, + fJ2 For best accuracy the cable terminations (short-circuit or open circuit) shall have the same electrical length. 6 Test report The test report shall include: - temperature, -
30、frequency range, - sample length, - the phase velocity, group velocity, propagation time and delay as required. BS EN 5 O 2 89-1-7: 200 1 389 Chiswick High Road London w4 4AL BSI - British Standards Institution BSI is the independent national body responsible for preparing British Standards. It pres
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