1、BRITISH STANDARD Communication cables - Specifications for test methods - Part 3-9: Mechanical test methods - Bending tests The European Standard EN 50289-3-72001 has the status of a British Standard ICs 33.120.10 BS EN 50289-3-9:2001 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGH
2、T LAW BS EN 50289-3-9:2001 Amd. No. Q BSI 14 November 2001 National foreword Date Comments This British Standard is the official English language version of The UK participation in its preparation was entrusted by Technical Committee EPL/46, Cables, wire and waveguides, RF connectors, and accessorie
3、s for communication and signalling, to Subcommittee EPL/46/1, Communication cables, which has the responsibility to: EN 50289-3-9:2001. - - aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the U
4、K interests informed; monitor related international and European developments and promulgate 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 public
5、ations referred to in this document may be found in the BSI Standards Catalogue under the section 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 provi
6、sions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. This British Standard, having been prepared under the direction of the Electrotechnical Sector policy and Strat
7、egy Committee, was published under the authority ofthe Standards Policy and Strategy Committee on 14 November 2001 Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 20, an inside back cover and a back cover. The BSI copyright date displayed
8、in this document indicates when the document was last issued. ISBN O 580 38691 O J EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM August 2001 ICs 33.120.10 English version Communication cables - Specifications for test methods Part 3-9: Mechanical test methods - Bending tests Cbles de communicati
9、on - Spcifications des mthodes dessai Partie 3-9: Mthodes dessais mcaniques - Essais de pliage Kommunikationskabel - Spezifikationen fr Prfverfahren Teil 3-9: Mechanische Prfverfahren - Biegeprfungen This European Standard was approved by CENELEC on 2001-05-01. CENELEC members are bound to comply wi
10、th 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 be obtained on application to the Central Secretar
11、iat 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 status as the
12、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, Switzerland and United Kingdom. CENELEC European Committe
13、e for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels O 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC m
14、embers: Ref. No. EN 50289-3-9:2001 E EN 50289-3-9:2001 -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 50289-3-9 on 2001-05-01. The following dat
15、es 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 which the national standards conflicting with the EN have to be withdrawn (daw) 2004-04-01 This European Standard
16、has been prepared under the European Mandate M/212 given to CENELEC by the European Commission and the European Free Trade Association. -3- EN 50289-3-9:2001 Contents 1 Scope 5 2 Normative references . 5 3 Definitions . 5 4 Single bending 5 4.1 Equipment 5 4.2 Test sample 5 4.2.1 Optical cables . 5
17、4.2.2 Coaxial cables 6 4.2.3 Symmetrical cables., 6 4.3 Procedure . 6 4.3. I Procedure 1 6 4.3.2 Procedure 2 6 4.4 Requirements 6 4.5 Test report . 6 5 Repeated bending 7 5.1 Equipment 7 5.2 Test sample 7 5.2.1 Sample length . 7 5.2.2 Termination 7 5.3 Procedure . 7 5.4 Requirements 7 5.5 Test repor
18、t . 8 6 Flexing 10 6.2 Test sample 10 6.4 Requirements 10 6.5 Test report . 10 6.1 Equipment 10 6.3 Procedure . 10 7 Flexing endurance 12 7.3 Procedure . 12 7.5 Test report . 12 Cable bending under tension (dynamic test) . 13 8.3 Procedure . 13 8.3.1 Procedure I 13 8.3.2 Procedure 2 14 8.4 Requireme
19、nts 14 7.1 Equipment 12 7.2 Test sample 12 7.4 Requirements 12 8 8.1 Equipment 13 8.2 Test sample 13 8.5 Test report . 14 EN 50289-3-9:2001 -4- 9 Stiffness . 16 9.1 9.2 9.3 9.4 9.5 9.6 10 Kink 10.1 10.2 10.3 10.4 10.5 Introduction . 16 Equipment 16 9.2.1 MethodA 16 9.2.2 Method B 16 9.2,3 Method C 1
20、6 Test sample 16 9.4.1 MethodA 16 Procedure . 16 9.4.2 Method B 17 9.4.3 Method C 17 Requirements 18 Test report . 18 test . 20 Sample 20 Equipment 20 Procedure . 20 Requirement 20 Test report . 20 -5- EN 50289-3-9:2001 1 Scope This Part 3-9 of EN 50289 details the methods of test to determine the b
21、ending tests used in analogue and digital communication systems to: - bending around a test mandrel (clause 4); - repeated bending (clause 5); - repeated flexing in service (clause 6); - flexing in service (clause 7); - bending around rollers or bows during installation (clause 8); and - measure the
22、 stiffness (clause 9) of such a cable; - kink test (clause IO). It is to be read in conjunction with Part 3-1 of EN 50289, which contains essential provisions for its application. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publicat
23、ions. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision.
24、For undated references the latest edition of the publication referred to applies (including amendments). EN 50289-3-1 2001 Communication cables - Specifications for test methods - Part 3-1: Mechanical test methods - General requirements EN 50290-1-2? Communication cables - Part 1-2: Definitions 3 De
25、finitions For the purposes of this European Standard the definitions of EN 50290-1-2 apply. 4 Single bending 4.1 Equipment A single mandrel apparatus shall enable the sample to be wrapped tangentially in a close helix around a test mandrel. 4.2 Test sample 4.2.1 Optical cables The sample shall be te
26、rminated at each end in a manner such that the fibres, sheath(s) and any strain members are clamped together in a representative manner. ?) At draft stage. EN 50289-3-9:2001 -6- 4.2.2 Coaxial cables The sample shall be terminated at each end by suitable connectors. 4.2.3 Symmetrical cables The sampl
27、e shall be fitted at each end with suitable terminations. 4.3 Procedure As indicated in the relevant cable specification, one of the following two procedures shall be used. 4.3.1 Procedure 1 The sample shall be wrapped in a close helix around the mandrel at a uniform rate. Sufficient tension shall b
28、e applied to ensure that the sample contours the mandrel. The sample shall then be unwrapped. A cycle consists of one wrapping and one unwrapping. The diameter of the test mandrel, the number of turns per helix and the number of cycles shall be shown in the relevant cable specification. 4.3.2 Proced
29、ure 2 The sample shall be bent around a mandrel through 180“ and kept taut during the bending. A cycle consists of one U bend followed by a reverse U bend, and returned to the straight position. The diameter of the test mandrel and the number of cycles shall be stated in the relevant cable specifica
30、tion. 4.4 Requirements The acceptance criteria for the test shall be stated in the relevant cable specification. Typical failure modes include loss of optical or electrical continuity, degradation of optical transmittance or transmission performance or physical damage to the cable. 4.5 Test report T
31、he test report shall include: - procedure to be used (procedure 1 or procedure 2); - test mandrel diameter (or ratio of mandrel diameter to cable diameter); - number of cycles; - number of turns (for procedure 1); - maximum allowable attenuation increase: - during the test (if applicable), - after t
32、he test (if applicable); - test temperature; - pass/fail criteria -7- EN 50289-3-9:2001 5 Repeated bending 5.1 Equipment The apparatus shall permit a sample to be bend backwards and forwards through angles up to 180“, the two extreme positions making an angle of 90“ on both sides of the vertical, wh
33、ilst being subjected to a tensile load. For testing cable, a suitable apparatus is shown in Figure 1. For testing cable/connector assemblies, a suitable apparatus is shown in Figure 2. Other equivalent apparatus may be used. The bending arm shall have an adjustable clamp of fixture to permit holding
34、 the cable securely during the entire test. For connectorized cables, a connector may be used to hold the cable on the bending arm providing that its characteristics fit with the tensile load. The apparatus shall be capable of cycling. Displacing the sample from the vertical position to the extreme
35、right position then oscillating to the extreme left position and returning to the original vertical position is considered to be one cycle. Unless otherwise specified in the relevant cable specification, the bending rate shall be approximately one cycle in 2 s. The apparatus shall include any test e
36、quipment needed to measure the changes in transmission performance requested in the relevant specification. 5.2 Test sample 5.2.1 Sample length The sample length shall be sufficient to carry out the testing specified. When only physical damage is to be evaluated the length may range from 1 m (for ex
37、ample for small diameter jumper cords) to 5 m (for larger diameter cables). Longer lengths may be necessary to permit transmission measurements. 5.2.2 Termination The sample may be terminated at each end in a connector, or in a representative manner. The clamps on the bending apparatus may be adequa
38、te, or the sample may be long enough that no rest raint is needed. 5.3 Procedure The procedure can be defined by 6 steps. + Step 1 : + Step 2 : + Step 3 : + Step 4 : + Step 5 : + Step 6 : 5.4 Requirements The acceptance criteria for the test shall be stated in the relevant cable specification. Typic
39、al failure modes include loss of transmission performance of physical damage to the cable. Precondition sample at standard atmospheric conditions for 24 hours. Fix the sample to the apparatus as shown in Figures 1 and 2. Apply the weight of mass as shown in the relevant cable specification. Measure
40、acceptance criteria parameters to establish baseline values. Carry out repeated bending for the number of cycles specified in the relevant cable specification. Carry out acceptance criteria parameter measurements. If necessary the sample may be removed from the apparatus for visual examination. EN 5
41、0289-3-9:2001 5.5 Test report The test report shall include: - the angle of displacement: - number of cycles; - mass of the weight; - bending radius R; - test temperature; - pasclfail criteria. -8- 90 dearee: 1 -9- Agodegrees I / I , Axis of o isciliation I / I x I 1 l Con i I ;i - Weight Figure 2 -
42、 Repeated bending test for cablelconnector assembly EN 50289-3-9:2001 - 10- 6 Flexing 6.1 Equipment The test is carried out using the apparatus shown in Figure 3. The pulleys shall have a semicircular shaped groove for circular cables and a flat groove for flat cables. The restraining clamps D shall
43、 be fixed so that the pull is always applied by the weight from which the carrier is moving away. 6.2 Test sample The sample shall be terminated at each end in a connector, or in a representative manner. The length of the sample shall be sufficient to carry out the testing specified. 6.3 Procedure T
44、he sample shall be stretched over the pulleys, each end being loaded with a weight. The mass of this weight and the diameter of the pulleys A and B shall be as specified in the relevant cable specification. The sample shall be flexed for the number of cycles specified in the relevant cable specifica
45、tion. A cycle is defined as the movement of the carriage away from its starting position to one end of the traverse followed by movement in the opposite direction to the other end and then back to the starting position. 6.4 Requirements The acceptance criteria for the test shall be stated in the rel
46、evant cable specification. Typical failure modes include less of transmission performance or physical damage to the cable. 6.5 Test report The test report shall include: - - mass of weights; - number of cycles; - test temperature; - padfail criteria. diameter of pulleys A and B; - 11 - EN 50289-3-9:
47、2001 - Reciprocating carriage Restraining clamp D Restraining clamp D o U 1 Figure 3 - Flexing apparatus EN 50289-3-9:2001 - 12- 7 Flexing endurance 7.1 Equipment The test is carried out using the apparatus shown in Figure 4. 7.2 Test sample The sample shall be taken from one end of a finished cable
48、 The sample shall be terminated at each end in a connector, or in a representative manner. The length of the sample shall be sufficient to carry out the testing specified. The maximum length of cable assembly should be less than 2 m. 7.3 Procedure The cable shall be placed on a horizontal table in a
49、n apparatus as illustrated in Figure 4. Whilst one end is fixed the other end is moved back and forth in the direction of the cable axis. 7.4 Requirements After the test, the cable shall show no visible damage. Electrical or optical requirements stated in the relevant cable specification shall be complied with. 7.5 Test report The test report shall include: - - - - test temperature: - pasdfail criteria. movement amplitude, normally half the length of the assembly: number of cycles, normally 500; electrical tests or optical tests to be applied with requ
