1、 IEC 61300-2-48 Edition 2.0 2009-03 INTERNATIONAL STANDARD Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 2-48: Tests Temperature-humidity cycling IEC 61300-2-48:2009(E) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2009 IEC, Geneva, Switzer
2、land All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IEC or IECs member National Committee in the country
3、of the requester. If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or your local IEC member National Committee for further information. IEC Central Office 3, rue de Varemb CH-1211 Geneva 20 Switze
4、rland Email: inmailiec.ch Web: www.iec.ch About the IEC The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes International Standards for all electrical, electronic and related technologies. About IEC publications The technical content of
5、IEC publications is kept under constant review by the IEC. Please make sure that you have the latest edition, a corrigenda or an amendment might have been published. Catalogue of IEC publications: www.iec.ch/searchpub The IEC on-line Catalogue enables you to search by a variety of criteria (referenc
6、e number, text, technical committee,). It also gives information on projects, withdrawn and replaced publications. IEC Just Published: www.iec.ch/online_news/justpub Stay up to date on all new IEC publications. Just Published details twice a month all new publications released. Available on-line and
7、 also by email. Electropedia: www.electropedia.org The worlds leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical Vocabula
8、ry online. Customer Service Centre: www.iec.ch/webstore/custserv If you wish to give us your feedback on this publication or need further assistance, please visit the Customer Service Centre FAQ or contact us: Email: csciec.ch Tel.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 61300-2-48 Edition 2.0 2
9、009-03 INTERNATIONAL STANDARD Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 2-48: Tests Temperature-humidity cycling INTERNATIONAL ELECTROTECHNICAL COMMISSION K ICS 33.180.20 PRICE CODE ISBN 2-8318-1033-6 Registered trademark of the Internation
10、al Electrotechnical Commission 2 61300-2-48 IEC:2009(E) CONTENTS FOREWORD.3 1 Scope.5 2 Normative references .5 3 General description 5 4 Apparatus.6 4.1 Chamber .6 4.2 Optical source and detector.6 5 Procedure 6 5.1 Preparation of specimens6 5.2 Preconditioning .6 5.3 Initial examinations and measu
11、rements .6 5.4 Conditioning6 5.4.1 Method A.6 5.4.2 Method B.7 5.5 Recovery.8 5.6 Final examinations and measurements8 6 Severity9 7 Details to be specified 9 Bibliography10 Figure 1 Temperature-humidity profile for T max= 65 C, T min= 10 C 7 Figure 2 Temperature-humidity profile for T max= 85 C .8
12、Table 1 Test severities.9 61300-2-48 IEC:2009(E) 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS BASIC TEST AND MEASUREMENT PROCEDURES Part 2-48: Tests Temperature-humidity cycling FOREWORD 1) The International Electrotechnical Commission (IEC
13、) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition
14、 to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
15、in the subject dealt with may participate in this preparatory work. International, governmental and non- governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with co
16、nditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC N
17、ational Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the
18、 way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any
19、IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC Publication. 6) All users shoul
20、d ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damag
21、e of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of t
22、he referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights
23、. International Standard IEC 61300-2-48 has been prepared by subcommittee 86B: Fibre optic interconnecting devices and passive components, of IEC technical committee 86: Fibre optics. This second edition of IEC 61300-2-48 cancels and replaces the first edition published in 2003 and constitutes a tec
24、hnical revision. The main changes are the addition of the Category O cycle procedure and the severity reconsideration. The text of this standard is based on the following documents: FDIS Report on voting 86B/2807/FDIS 86B/2829/RVD Full information on the voting for the approval of this standard can
25、be found in the report on voting indicated in the above table. 4 61300-2-48 IEC:2009(E) This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts of the IEC 61300 series, published under the general title Fibre optic interconnecting devices and passive
26、components Basic test and measurement procedures, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific p
27、ublication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. 61300-2-48 IEC:2009(E) 5 FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS BASIC TEST AND MEASUREMENT P
28、ROCEDURES Part 2-48: Tests Temperature-humidity cycling 1 Scope This part of IEC 61300 details a procedure for determining the suitability of a fibre optic device or closure to withstand variations in humidity and temperature that may occur during operation, storage and/or transport. The test is int
29、ended to indicate the performance of such devices when exposed to heat and humidity followed by short-term freezing. In general terms, this test provides a high temperature to induce potential failures due to softening and expansion, a high humidity to encourage moisture absorption and swelling and
30、a low temperature to facilitate ice formation, embrittlement and contraction. This test differs from other cyclic environmental tests, notably the damp heat cyclic test of IEC 61300-2-46 and the composite temperature-humidity cyclic test of 61300-2-21, by incorporating alternative levels of severity
31、. This is achieved through a) a greater number of cycles; b) a greater cyclic temperature range; c) a decreased cyclic period. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For u
32、ndated references, the latest edition of the referenced document (including any amendments) applies. IEC 61300-1, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 1: General and guidance IEC 61300-3-1, Fibre optic interconnecting devices and passi
33、ve components Basic test and measurement procedures Part 3-1: Examinations and measurements Visual examination IEC 61300-3-4, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-4: Examinations and measurements Attenuation 3 General description The
34、 specimen is placed in an environmental chamber and subjected to a number of temperature-humidity cycles, as defined in the relevant specification. The attenuation of the specimen is monitored throughout the duration of the test. 6 61300-2-48 IEC:2009(E) 4 Apparatus 4.1 Chamber The apparatus shall c
35、onsist of an environmental chamber capable of maintaining the temperature and humidity requirements within the specified tolerances. The chamber shall be constructed so that it is capable of housing the specimen; it allows access for measurement; it is capable of maintaining homogeneous conditions;
36、it uses distilled, demineralized or deionized water to achieve the required humidity conditions; no rust or corrosion contaminants are imposed on the specimen; no condensed water can fall on the specimen; the conditions experienced by the specimen and the temperature- and humidity-sensing devices ar
37、e as similar as possible. 4.2 Optical source and detector The optical source and detector used to measure changes in attenuation shall comply with those specified in IEC 61300-3-4. NOTE A device to record attenuation over time (X, t) should be used where the optical detector does not have the capabi
38、lity to monitor continuously. 5 Procedure 5.1 Preparation of specimens Prepare the specimen according to the manufacturers instructions or as specified in the relevant specification. The specimen shall be terminated with a sufficient length of fibre cable to facilitate connection with the optical so
39、urce and detector. 5.2 Preconditioning Place the specimen in the chamber and precondition for 2 h at the standard test conditions, as defined in IEC 61300-1 unless otherwise specified in the relevant specification. 5.3 Initial examinations and measurements Complete initial examinations and measureme
40、nts on the specimen as required by the relevant specification. 5.4 Conditioning Set the chamber temperature and humidity profile to achieve the specified severities. 5.4.1 Method A For Category O, it is necessary to move to transition rapidly from the low temperature to the high temperature without
41、a dwell at 23 C. In this case, make the temperature changing according to the following cycle: The specimen shall be subjected to a temperature cycle from T maxC 2 C to T minC 2 C for a total of 14 cycles, where T maxand T minare defined by the relevant specification. 61300-2-48 IEC:2009(E) 7 Exampl
42、es of T maxand T minare shown in Table 1. Temperature change from 23 C to T minand T minto 23 C shall occur in 1 h. Temperature change from T minto T maxand T maxto T minmust occur faster (20 min max.) to maximize condensation. Dwell times for this test shall be a minimum of 2 h. NOTE Dwells occur a
43、t T max ,23 C and T minC. The humidity shall be controlled from T minto T maxas follows: at 23 C maintain a constant relative humidity of 95 %; between 23 C and T maxrelative humidity is uncontrolled; at T maxmaintain a constant relative humidity of 95 %; between T maxand T minrelative humidity is u
44、ncontrolled; at T minthe humidity is uncontrolled. However, water vapour should not be evacuated from the environmental chamber. This is to allow condensation and the formation of ice to occur. A schematic showing of an example of the temperature-humidity profile for T max= 65 C and T min= 10 C is s
45、hown in Figure 1. NOTE The tolerance on relative humidity values is 5 %. This means that the actual operating humidity may be up to 100 % RH, for short term operation, however a 95 % RH upper limit has been specified for practical measurement purposes. Attenuation measurements shall be made througho
46、ut the duration of the test. The attenuation measurements shall be within the specified limits defined in the relevant specification. 20 10 0 10 20 30 40 50 60 70 0 2 4 6 8 10 12 14 Time (h) Temperature (C) Humidity control One cycle Humidity control IEC 379/09 Figure 1 Temperature-humidity profile
47、for T max= 65 C, T min= 10 C 5.4.2 Method B The specimen shall be subjected to a temperature cycle from T maxC 2 C to 40 C 2 C for a total of 42 cycles, where T maxis the upper temperature limit, defined by the relevant specification. (Examples of T maxare shown in Table 1). The rate of temperature
48、change shall be 1 C per minute and dwell times for this test shall be a minimum of 1 h. NOTE Dwells occur at T max ,23 C and 40 C. The humidity shall be controlled from 10 C to T maxas follows: 8 61300-2-48 IEC:2009(E) at 23 C maintain a constant relative humidity of 85 %; between 23 C and T maxmain
49、tain a nominal linear change in relative humidity; at T maxmaintain a constant relative humidity of 20 %; between 10 C and 23 C maintain a relative humidity of 85 %; below 10 C the humidity is uncontrolled. However, water vapour should not be evacuated from the environmental chamber. This is to allow condensation and the formation of ice to occur. A schematic showing an example
