1、BSI Standards PublicationOptical fibresPart 1-50: Measurement methods Damp heat (steady state) testsBS EN 60793-1-50:2015National forewordThis British Standard is the UK implementation of EN 60793-1-50:2015. It isidentical to IEC 60793-1-50:2014. It supersedes BS EN 60793-1-50:2002which is withdrawn
2、.The UK participation in its preparation was entrusted by Technical Com-mittee GEL/86, Fibre optics, to Subcommittee GEL/86/1, Optical fibres and cables.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all t
3、he necessary provisions ofa contract. Users are responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 82207 0ICS 33.180.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Stand
4、ard was published under the authority of theStandards Policy and Strategy Committee on 31 January 2015.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 60793-1-50:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60793-1-50 January 2015 ICS 33.180.10 Super
5、sedes EN 60793-1-50:2002 English Version Optical fibres - Part 1-50: Measurement methods - Damp heat (steady state) tests (IEC 60793-1-50:2014) Fibres optiques - Partie 1-50: Mthodes de mesure - Essais de chaleur humide (tat continu) (IEC 60793-1-50:2014) Lichtwellenleiter - Teil 1-50: Messmethoden
6、und Prfverfahren - Feuchte Wrme (konstant) (IEC 60793-1-50:2014) This European Standard was approved by CENELEC on 2014-10-14. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national stand
7、ard 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 versions (English, French, German). A version i
8、n 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 committees of Austria, Belgium, Bulgaria, Croa
9、tia, 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turk
10、ey 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 2015 CENELEC All rights of exploitation in any form and
11、 by any means reserved worldwide for CENELEC Members. Ref. No. EN 60793-1-50:2015 E BS EN 60793-1-50:2015EN 60793-1-50:2015 - 2 - Foreword The text of document 86A/1526/CDV, future edition 2 of IEC 60793-1-50, prepared by SC 86A “Fibres and cables“ of IEC/TC 86 “Fibre optics“ was submitted to the IE
12、C-CENELEC parallel vote and approved by CENELEC as EN 60793-1-50:2015. 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) 2015-07-14 latest date by which the national standa
13、rds conflicting with the document have to be withdrawn (dow) 2017-10-14 This document supersedes EN 60793-1-50:2002. 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 identifying
14、any or all such patent rights. Endorsement notice The text of the International Standard IEC 60793-1-50:2014 was approved by CENELEC as a European Standard without any modification. BS EN 60793-1-50:2015- 3 - EN 60793-1-50:2015 Annex ZA (normative) Normative references to international publications
15、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 referenced docum
16、ent (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: www.cenel
17、ec.eu. Publication Year Title EN/HD Year IEC 60068-2-78 - Environmental testing - Part 2-78: Tests - Test Cab: Damp heat, steady state EN 60068-2-78 - IEC 60793-1-31 - Optical fibres - Part 1-31: Measurement methods and test procedures - Tensile strength EN 60793-1-31 - IEC 60793-1-32 - Optical fibr
18、es - Part 1-32: Measurement methods and test procedures - Coating strippability EN 60793-1-32 - IEC 60793-1-33 - Optical fibres - Part 1-33: Measurement methods and test procedures - Stress corrosion susceptibility EN 60793-1-33 - IEC 60793-1-40 (mod) 2001 Optical fibres - Part 1-40: Measurement met
19、hods and test procedures - Attenuation EN 60793-1-40 2003 +AA IEC 60793-2-10 - Optical fibres - 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 f
20、or class B single-mode fibres EN 60793-2-50 - IEC 60793-2-60 - Optical fibres - Part 2-60: Product specifications - Sectional specification for category C single-mode intraconnection fibres EN 60793-2-60 - BS EN 60793-1-50:2015 2 IEC 60793-1-50:2014 IEC 2014 CONTENTS 1 Scope 5 2 Normative references
21、 5 3 Apparatus 6 3.1 Chamber . 6 3.2 Humidifier . 6 3.3 Other apparatus 6 4 Sampling and specimens . 6 5 Procedure 6 5.1 General . 6 5.2 Optical measurements 6 5.3 Mechanical measurements 7 5.4 Preconditioning . 7 5.5 Conditioning 7 5.6 Recovery 7 6 Pass/fail criteria . 7 7 Results 7 7.1 Information
22、 to be provided with each test 7 7.2 Information to be available upon request . 8 8 Specification information . 8 BS EN 60793-1-50:2015IEC 60793-1-50:2014 IEC 2014 5 OPTICAL FIBRES Part 1-50: Measurement methods and test procedures Damp heat (steady state) tests 1 Scope This part of IEC 60793 provid
23、es 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-category A1a to A1d multimode fibres and class B and C single-mode fibres to withstand the environmental condition of high humidity and h
24、igh temperature which may occur in actual use, storage and/or transport. The test is primarily intended to permit the observation of effects of high humidity at constant temperature over a given period. This procedure is conducted in accordance with IEC 60068-2-78, Test Cab. NOTE The applicability o
25、f this test to other fibre categories is under study. 2 Normative references 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 e
26、dition of the referenced document (including any amendments) applies. IEC 60068-2-78, Environmental testing Part 2-78: Tests Test Cab: Damp heat, steady state IEC 60793-1-31, Optical fibres Part 1-31: Measurement methods and test procedures Tensile strength IEC 60793-1-32, Optical fibres Part 1-32:
27、Measurement and test procedures Coating strippability IEC 60793-1-33, Optical fibres Part 1-33: Measurement methods and test procedures Stress corrosion susceptibility IEC 60793-1-40:2001, Optical fibres Part 1-40: Attenuation measurement methods IEC 60793-2-10, Optical fibres Part 2-10: Product spe
28、cifications 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 Sectional specification for class C single-mod
29、e intraconnection fibres BS EN 60793-1-50:2015 6 IEC 60793-1-50:2014 IEC 2014 3 Apparatus 3.1 Chamber The apparatus consists of an environmental chamber in accordance with IEC 60068-2-78, Test Cab. The chamber shall be capable of housing the specimen and of allowing access for measurement during con
30、ditioning. It shall also be capable of maintaining the specified temperature and humidity within the specified tolerances. Forced air circulation may be used to maintain homogeneous conditions. The chamber and accessories shall be constructed and arranged in such a manner as to avoid condensation dr
31、ipping on the specimen. 3.2 Humidifier De-mineralized or de-ionized water is used to obtain the specified humidity. No rust or corrosion contaminants shall be imposed on the specimen by the test facility. The water added to the humidifier shall be controlled according to the manufacturers instructio
32、ns. 3.3 Other apparatus Additional apparatus may be necessary to perform the examinations and measurements (or as specified in the detail specification). 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 a
33、t least 2 000 m for fibre class B and C, to allow 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 detriment
34、al effect on the fibre whilst under test conditions. 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 hori
35、zontally or vertically, with a minimum bend diameter of 150 mm to avoid any macro-bend effects. A length of the control 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 specimen should no
36、t be dusted. 5 Procedure 5.1 General Conduct the procedure in accordance with IEC 60068-2-78, Test Cab, with the temperature, humidity and exposure time as given below: Temperature Relative humidity Exposure time +85 C 85 % 30 days 5.2 Optical measurements Attenuation measurement shall be carried ou
37、t at the wavelength 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 relative humidity) and after the test. Attenuation
38、 changes shall be recorded. BS EN 60793-1-50:2015IEC 60793-1-50:2014 IEC 2014 7 Other optical measurements may be required if specified in the relevant product specification 5.3 Mechanical measurements The fibre coating strip force shall be measured before and after the test, using the method descri
39、bed in IEC 60793-1-32. The control specimen (see Clause 4) is used to evaluate the change in strippability. The tensile strength shall be measured on the aged specimens, according to IEC 60793-1-31. The stress corrosion susceptibility parameter, dynamic n value (nd), shall be measured on the aged sp
40、ecimens as per IEC 60793-1-33. . 5.4 Preconditioning If specified, the specimen shall be preconditioned, as required by the detail specification. 5.5 Conditioning Stabilize the chamber and the specimen to standard atmospheric conditions prior to the reference measurements being taken. Adjust the cha
41、mber temperature and humidity to the specified severity. Allow the specimen to reach 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 atm
42、ospheric conditions. The rate of change of temperature shall not exceed 1 C/min, averaged over a maximum period of 5 min. The detail 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
43、 not remove the specimen(s) from the chamber whilst these measurements are being made. 5.6 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 s
44、pecification may call for measurements 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 fibre
45、s, IEC 60793-2-50 for B fibres and IEC 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 coating strip force BS EN 60793-1-50:2
46、015 8 IEC 60793-1-50:2014 IEC 2014 tensile strength results (median value and 15thpercentile) dynamic n value (nd) 7.2 Information to be available upon request Description of all key equipment. 8 Specification information The detail specification shall specify the following information: pass/fail cr
47、iteria; information to be reported; any deviations to the procedure that apply. _ BS EN 60793-1-50:2015This page deliberately left blankBSI is the national body responsible for preparing British Standards and other standards-related publications, information and services.BSI is incorporated by Royal
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