1、BRITISH STANDARDBS EN 60068-2-30: 2005Environmental testing Part 2-30: Tests Test Db: Damp heat, cyclic (12 h + 12 h cycle)The European Standard EN 60068-2-30:2005 has the status of a British StandardICS 19.040g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g
2、50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 60068-2-30:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 8 February 2006 BSI 8 February 2006ISBN 0 580 47760 6National f
3、orewordThis British Standard is the official English language version of EN 60068-2-30:2005. It was derived by CENELEC from IEC 60068-2-30:2005. It supersedes BS EN 60068-2-30:1999 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee GEL/104, Environmental
4、testing, which has the responsibility to:A list of organizations represented on this committee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under
5、 the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct applic
6、ation.Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor
7、related international and European developments and promulgate them in the UK.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 14, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the d
8、ocument was last issued.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARD EN 60068-2-30 NORME EUROPENNE EUROPISCHE NORM December 2005 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektr
9、otechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60068-2-30:2005 E ICS 19.040 Supersedes EN 60068-2-30:1999English version Environmental testing Pa
10、rt 2-30: Tests Test Db: Damp heat, cyclic (12 h + 12 h cycle) (IEC 60068-2-30:2005) Essais denvironnement Partie 2-30: Essais Essai Db: Essai cyclique de chaleur humide (cycle de 12 h + 12 h) (CEI 60068-2-30:2005) Umgebungseinflsse Teil 2-30: Prfverfahren Prfung Db: Feuchte Wrme, zyklisch (12 + 12 S
11、tunden) (IEC 60068-2-30:2005) This European Standard was approved by CENELEC on 2005-11-01. 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 standard without any alteration. Up-to-d
12、ate lists and bibliographical references concerning such national standards may be 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 unde
13、r the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, G
14、reece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Foreword The text of document 104/369/FDIS, future edition 3 of IEC 60068-2-30, prepared by IEC TC 104, Environment
15、al conditions, classification and methods of test, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60068-2-30 on 2005-11-01. This European Standard supersedes EN 60068-2-30:1999. The main changes with respect to EN 60068-2-30:1999 are: editorial changes, addition of
16、normative references, addition of guidance for temperature tolerances, period for recovery has been extended. 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) 2006-08-01 latest
17、 date by which the national standards conflicting with the EN have to be withdrawn (dow) 2008-11-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60068-2-30:2005 was approved by CENELEC as a European Standard without any modification. _ EN 60068-
18、2-30:2005 2 3 EN 60068-2-30:2005 CONTENTS 1 Scope 4 2 Normative references .4 3 General description 4 4 Testing chamber Construction requirements 5 5 Severities.5 6 Initial measurements 6 7 Conditioning.6 8 Intermediate measurements .7 9 Recovery7 10 Final measurements .8 11 Information to be given
19、in the relevant specification 8 Annex A (informative) Selection of variant for the temperature-fall period Guidance.13 Annex ZA (normative) Normative references to international publications with their corresponding European publications .14 Figure 1 Test Db Stabilizing period .9 Figure 2 Test Db Te
20、st cycle Variants 1 and 2 .11 Figure 3 Test Db Recovery at controlled conditions .12 EN 60068-2-30:2005 4 ENVIRONMENTAL TESTING Part 2-30: Tests Test Db: Damp heat, cyclic (12 h + 12 h cycle) 1 Scope This part of IEC 60068 determines the suitability of components, equipment or other articles for use
21、, transportation and storage under conditions of high humidity combined with cyclic temperature changes and, in general, producing condensation on the surface of the specimen. If the test is being used to verify the performance of a specimen whilst it is being transported or stored in packaging then
22、 the packaging will normally be fitted when the test conditions are being applied. For small, low mass specimens, it may be difficult to produce condensation on the surface of the specimen using this procedure; users should consider the use of an alternative procedure such as that given to IEC 60068
23、-2-38. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60068-2-38, Env
24、ironmental testing Part 2-38: Tests Test Z/AD: Composite temperature/humidity cyclic test IEC 60068-3-6, Environmental testing Part 3-6: Supporting documentation and guidance Confirmation of the performance of temperature/humidity chambers IEC 60068-1:1988, Environmental testing Part 1: General and
25、guidance IEC 60068-5-2, Environmental testing Part 5: Guide to drafting of test methods Terms and definitions 3 General description This test comprises one or more temperature cycles in which the relative humidity is maintained at a high level. Two variants of the cycle are given which are identical
26、 except for the temperature fall period; during this part of the cycle, variant 2 allows wider tolerances of relative humidity and the rate of temperature fall. The upper temperature of the cycle and the number of cycles (see Clause 5) determine the test severity. Test profiles illustrating the proc
27、edure are shown in Figures 1, 2a, 2b and 3. 4 5 EN 60068-2-30:2005 The tolerances stated in this standard do not take measurement uncertainty into consideration. 4 Testing chamber Construction requirements 4.1 The temperature can be varied cyclically between 25 C 3 K and the appropriate upper temper
28、ature specified with the tolerance and rate of change specified in 7.3 and Figures 2a or 2b, as applicable. The total temperature tolerance of 3 K is intended to take account of absolute errors in the measurement, slow changes of temperature, and temperature variations of the working space. However,
29、 in order to maintain the relative humidity within the required tolerances, it is necessary to keep the temperature difference between any two points in the working space at any moment within narrower limits. The required humidity conditions will not be achieved if such temperature differences excee
30、d 1 K. It may also be necessary to keep short-term fluctuations within 0,5 K to maintain the required humidity. 4.2 The relative humidity in the working space can be maintained within the limits given in 7.3 and in Figures 2a or 2b, as applicable. 4.3 Care shall be taken to ensure that the condition
31、s prevailing at any point in the working space are uniform and are as similar as possible to those prevailing in the immediate vicinity of suitably located temperature and humidity sensing devices. The chamber shall meet the performance criteria as detailed in IEC 60068-3-6. 4.4 The specimens under
32、test shall not be subjected to radiant heat from the chamber conditioning processes. 4.5 Water used for the maintenance of chamber humidity shall have a resistivity of not less than 500 m. Condensed water shall be continuously drained from the chamber and not used again until it has been re-purified
33、. Precautions shall be taken to ensure that no condensed water is allowed to fall on the specimens. 4.6 The dimensions, properties and/or electrical loading of the specimens under test shall not appreciably influence conditions within the chamber. 5 Severities 5.1 The combination of the upper temper
34、ature and the number of cycles define the severity of the test. 5.2 The severity shall be chosen from the following: a) upper temperature: 40 C, number of cycles: 2, 6, 12, 21, 56; b) upper temperature: 55 C, number of cycles: 1, 2, 6. EN 60068-2-30:2005 6 6 Initial measurements The specimens shall
35、be visually inspected, and functionally tested, as required by the relevant specification. 7 Conditioning The specimens shall be introduced into the chamber either in the unpacked, switched-off, ready-for-use state, or as otherwise specified in the relevant specification. Where no specific mounting
36、is prescribed, the thermal conduction of the mounting shall be low, so that for all practical purposes the specimen is thermally isolated. 7.1 Temperature tolerances The total temperature tolerance of 2 K and 3 K given in this standard is intended to take account of absolute errors in the measuremen
37、t, slow changes of temperature, and temperature variations of the working space. However, in order to maintain the relative humidity within the required tolerances, it is necessary to keep the temperature difference between any two points in the working space at any moment within narrower limits. Th
38、e required humidity conditions will not be achieved if such temperature differences exceed 1 K. It may also be necessary to keep short-term fluctuations within 0,5 K to maintain the required humidity. 7.2 Stabilizing period The temperature of the specimens shall be stabilized at 25 C 3 K (the defini
39、tion of temperature stability is given in IEC 60068-1 and IEC 60068-5-2). This shall be achieved by either a) placing the specimens in a separate chamber before introducing it into the test chamber, or, b) adjusting the temperature of the test chamber to 25 C 3 K after the introduction of the specim
40、ens and maintaining them at this level until the specimens attain temperature stability. During the stabilization of temperature by either method, the relative humidity shall be within the limits prescribed for standard atmospheric conditions for testing. Following stabilization, with the specimens
41、in the test chamber, the relative humidity shall be increased to not less than 95 % RH at an ambient temperature of 25 C 3 K. 7.3 Description of the 24 h cycle 7.3.1 The temperature of the chamber shall be raised to the appropriate upper temperature prescribed by the relevant specification. The uppe
42、r temperature shall be achieved in a period of 3 h 30 min and at a rate within the limits defined by the shaded areas in Figures 2a and 2b. During this period, the relative humidity shall not be less than 95 % RH. During the last 15 min it shall not be less than 90 % RH. 6 7 EN 60068-2-30:2005 Conde
43、nsation may occur on the specimen during this temperature-rise period. NOTE The condensation condition implies that the surface temperature of the specimen is below the dew point of the air in the chamber. 7.3.2 The temperature shall then be maintained within the prescribed limits for the upper temp
44、erature (2 K) until 12 h 30 min from the start of the cycle. During this period, the relative humidity shall be 93 % RH 3 %RH. During the first and last 15 min it shall be between 90 % RH and 100 % RH. 7.3.3 The temperature shall then be lowered in accordance with one of the two variants given below
45、. Variant 1 (see Figure 2a) The temperature shall be lowered to 25 C 3 K within 3 h to 6 h. The rate of fall for the first one and one half hours shall be such that, if maintained as indicated in Figure 2a, it would result in a temperature of 25 C 3 K being attained in 3 h 15 min. The relative humid
46、ity shall be not less than 95 % RH. During the first 15 min it shall be not less than 90 % RH. NOTE 1 See Annex A for descriptions of the type of specimen suitable for Variant 1. Variant 2 (see Figure 2b) The temperature shall be lowered to 25 C 3 K within 3 h to 6 h, but without the additional requ
47、irement for the first hour and one half as in variant 1. The relative humidity shall be not less than 80 % RH. NOTE 2 See Annex A for descriptions of the type of specimen suitable for Variant 2. 7.3.4 The temperature shall then be maintained at 25 C 3 K with a relative humidity of not less than 95 %
48、 RH until the 24 h cycle is completed. 8 Intermediate measurements The relevant specification may require functional tests during the conditioning programme. NOTE Measurements preceded by a recovery, which would require removal of the specimens from the chamber, are not permissible during the condit
49、ioning. If it is desired to make intermediate measurements, the relevant specification should define the measurements and the period(s) during the conditioning after which they will be carried out. 9 Recovery The relevant specification shall prescribe whether recovery shall be made at standard atmospheric conditions for testing (see 5.3 of IEC 60068-1), or at controlled recovery conditions (see 5.4.1 of IEC 60068-1). If controlled recove
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