1、BSI Standards PublicationOptical fibresPart 1-51: Measurement methods and test procedures Dry heat (steady state) testsBS EN 60793-1-51:2014National forewordThis British Standard is the UK implementation of EN 60793-1-51:2014. It isidentical to IEC 60793-1-51:2014. It supersedes BS EN 60793-1-51:200
2、2which is withdrawn.The UK participation in its preparation was entrusted by TechnicalCommittee GEL/86, Fibre optics, to Subcommittee GEL/86/1, Optical fibresand cables.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport
3、to include all the necessary provisions ofa contract. Users are responsible for its correct application. The British Standards Institution 2014.Published by BSI Standards Limited 2014ISBN 978 0 580 82208 7ICS 33.180.10Compliance with a British Standard cannot confer immunity fromlegal obligations.Th
4、is British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 May 2014.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 60793-1-51:2014EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60793-1-51 May 2014 ICS 33.180.
5、10 Supersedes EN 60793-1-51:2002 English Version Optical fibres - Part 1-51: Measurement methods and test procedures - Dry heat (steady state) tests (IEC 60793-1-51:2014) Fibres optiques - Partie 1-51: Mthodes de mesure et procdures dessai - Essais de chaleur sche (tat continu) (CEI 60793-1-51:2014)
6、 Lichtwellenleiter - Teil 1-51: Messmethoden und Prfverfahren - Trockene Wrme (konstant) (IEC 60793-1-51:2014) This European Standard was approved by CENELEC on 2014-03-12. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Eu
7、ropean 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 CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official v
8、ersions (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 CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical
9、committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovak
10、ia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CENE
11、LEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 60793-1-51:2014 E BS EN 60793-1-51:2014EN 60793-1-51:2014 - 2 - Foreword The text of document 86A/1527/CDV, future edition 2 of IEC 60793-1-51, prepared by SC 86A “Fibres and cables“ of IE
12、C/TC 86 “Fibre optics“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60793-1-51:2014. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2014-
13、12-12 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2017-03-12 This document supersedes EN 60793-1-51:2002. EN 60793-1-51 includes the following significant technical changes with respect to EN 60793-1-51:2002: a) harmonizing the content with se
14、ctional specifications of relevant fibre types; b) extending the applicability of the document to class C single-mode fibres. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for ide
15、ntifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 60793-1-51:2014 was approved by CENELEC as a European Standard without any modification. BS EN 60793-1-51:2014- 3 - EN 60793-1-51:2014 Annex ZA (normative) Normative references to international publ
16、ications with their corresponding European publications The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referen
17、ced document (including any amendments) applies. NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
18、www.cenelec.eu Publication Year Title EN/HD Year IEC 60068-2-2 - Environmental testing - Part 2-2: Tests - Test B: Dry heat EN 60068-2-2 - IEC 60793-1-40 (mod) 2001 Optical fibres - Part 1-40: Measurement methods and test procedures - Attenuation EN 60793-1-40 2003 IEC 60793-2-10 - Optical fibres -
19、Part 2-10: Product specifications - Sectional specification for category A1 multimode fibres EN 60793-2-10 - IEC 60793-2-50 - Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single-mode fibres EN 60793-2-50 - IEC 60793-2-60 - Optical fibres - Part 2-60: Produ
20、ct specifications - Sectional specification for category C single-mode intraconnection fibres EN 60793-2-60 - BS EN 60793-1-51:2014 2 60793-1-51 IEC:2014 CONTENTS 1 Scope 5 2 Normative references 5 3 Apparatus 5 3.1 Chamber 5 3.2 Other apparatus . 5 4 Sampling and specimens . 6 5 Procedure 6 5.1 Gen
21、eral 6 5.2 Optical measurements . 6 5.3 Preconditioning 6 5.4 Conditioning . 6 5.5 Recovery . 7 6 Pass/fail criteria . 7 7 Results 7 7.1 Information to be provided with each test . 7 7.2 Information to be available upon request 7 8 Specification information . 7 BS EN 60793-1-51:201460793-1-51 IEC:20
22、14 5 OPTICAL FIBRES Part 1-51: Measurement methods and test procedures Dry heat (steady state) tests 1 Scope This part of IEC 60793 provides a practical method for evaluating fibre performance in a defined environment. The purpose of this standard is to determine the suitability of optical fibre sub
23、-category A1a to A1d multimode fibres and class B and C single-mode fibres to withstand the environmental condition of high temperature (dry heat) which may occur in actual use, storage and/or transport. The test is primarily intended to permit the observation of effects of high temperature over a g
24、iven period. This procedure is conducted in accordance with IEC 60068-2-2, Test Bd. NOTE The applicability of this test to other fibre categories is under study. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, on
25、ly the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60068-2-2, Environmental testing Part 2-2: Tests Test B: Dry heat IEC 60793-1-40:2001, Optical fibres Part 1-40: Attenuation measurement methods IEC 60793-2-10,
26、 Optical fibres Part 2-50: Product specifications Sectional specification for category A1 multimode fibres IEC 60793-2-50, Optical fibres Part 2-50: Product specifications Sectional specification for class B single-mode fibres IEC 60793-2-60, Optical fibres Part 2-60: Product specifications Sectiona
27、l specification for class C single-mode intraconnection fibres 3 Apparatus 3.1 Chamber The apparatus consists of an environmental chamber in accordance with IEC 60068-2-2, Test Bd. The chamber shall be capable of housing the specimen, without subjecting it to direct radiant heat, and of allowing acc
28、ess for measurement during conditioning. It shall also be capable of maintaining the specified temperature within the specified tolerances. Forced air circulation may be used to maintain homogeneous conditions. 3.2 Other apparatus Additional apparatus may be necessary to perform the examinations and
29、 measurements (or as specified in the detail specification). BS EN 60793-1-51:2014 6 60793-1-51 IEC:2014 4 Sampling and specimens For optical measurements, the length of the specimen shall be at least 1 000 m for fibre sub-categories A1a to A1d, and at least 2 000 m for fibre class B and C, to allow
30、 the required measurement repeatability. The amount of the specimen outside of the test chamber shall be minimized, and if it exceeds 10 % of the overall specimen length, this should be reported. The preparation of the specimen shall have no detrimental effect on the fibre whilst under test conditio
31、ns. Unless otherwise defined in the detail specification, it is recommended that the fibre sample be loosely coiled and dusted with a material such as talcum powder, to allow the coils to move freely against each other. The specimen may be coiled horizontally or vertically, with a minimum bend diame
32、ter of 150 mm to avoid any macrobend effects. A control length of the specimen shall be removed prior to the test to enable the completion of required mechanical measurements for comparison to measurements made after the test. This control length should not be dusted. 5 Procedure 5.1 General Conduct
33、 the procedure in accordance with IEC 60068-2-2, Test Bd, with the temperature and exposure time, as given below: Temperature Exposure time +85 C 30 days The humidity is uncontrolled for this test, but it is recommended that it is not lower than 50 % RH, at the start of the test. 5.2 Optical measure
34、ments Attenuation measurement shall be carried out at the wavelengths specified in the relevant specification using either IEC 60793-1-40:2001, Annex B (insertion loss) or IEC 60793-1-40:2001, Annex C (backscattering) before, during (once the specimen has stabilized at the specified temperature) and
35、 after the test. Attenuation changes shall be recorded. Other optical measurements may be required if specified in the relevant product specification. 5.3 Preconditioning If specified, the specimen shall be preconditioned as required by the detail specification. 5.4 Conditioning Stabilize the chambe
36、r and the specimen to standard atmospheric conditions prior to the reference measurements being taken. Adjust the chamber temperature and humidity to the specified severity. The rate of change of temperature shall not exceed 1 C/min, averaged over a maximum period of 5 min. Allow the specimen to rea
37、ch temperature stability and maintain the temperature and humidity for the duration specified. At the completion of the test, allow the specimen to remain in the chamber while the temperature is reduced to standard atmospheric conditions. The rate of change of temperature shall not exceed 1 C/min, a
38、veraged over a maximum period of 5 min. The detail BS EN 60793-1-51:201460793-1-51 IEC:2014 7 specification may call for measurements during conditioning. If required, the detail specification shall specify the measurements to be taken and when to take them. Do not remove the specimen(s) from the ch
39、amber whilst these measurements are being made. 5.5 Recovery Unless otherwise required by the relevant specification, the specimen shall remain under standard atmospheric condition for recovery for a period greater than 12 h but not more than 48 h. The detail specification may call for measurements
40、during recovery. If required, the detail specification shall specify the measurements to be taken and when to take them. 6 Pass/fail criteria The applicable specification limits can be found in the relevant sectional specification of IEC 60793-2-10 for A1 fibres, IEC 60793-2-50 for B fibres and IEC
41、60793-2-60 for C fibres. 7 Results 7.1 Information to be provided with each test date and title of test; identification of specimen; length of specimen; nominal wavelength(s) at which the test was performed; attenuation change. 7.2 Information to be available upon request description of all key equi
42、pment. 8 Specification information The detail specification shall specify the following information: pass/fail criteria; information to be reported; any deviations to the procedure that apply. _ BS EN 60793-1-51:2014This page deliberately left blankThis page deliberately left blankBSI is the nationa
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