1、BRITISH STANDARD BS EN 60068-2-61: 1994 IEC 68-2-61: 1991 Environmental testing Part 2: Test methods Test Z/ABDM: Climatic sequence The European Standard EN 60068-2-61:1993 has the status of a British Standard This Part should be read in conjunction with BS2011-1.1:1989 General and guidance UDC 621.
2、3:620.193.21BSEN60068-2-61:1994 This British Standard, having been prepared under the direction of the General Electrotechnical Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 January 1994 BSI 03-1999 The following BSI references relat
3、e to the work on this standard: Committee reference GEL/15 Draft for comment 89/21019 DC ISBN 0 580 22782 0 Cooperating organizations The European Committee for Electrotechnical Standardization (CENELEC), under whose supervision this European Standard was prepared, comprises the national committees
4、of the following countries: Austria Italy Belgium Luxembourg Denmark Netherlands Finland Norway France Portugal Germany Spain Greece Sweden Iceland Switzerland Ireland United Kingdom Amendments issued since publication Amd. No. Date CommentsBSEN60068-2-61:1994 BSI 03-1999 i Contents Page Cooperating
5、 organizations Inside front cover National foreword ii Foreword 2 Text of EN 60068-2-61 3 National annex NA (informative) Committees responsible Inside back cover National annex NB (informative) Cross-references Inside back coverBSEN60068-2-61:1994 ii BSI 03-1999 National foreword This Part of BS EN
6、60068 has been prepared under the direction of the General Electrotechnical Standards Policy Committee. It is the English language version of EN60068-2-61:1993 Environmental testing Part 2: Test methods Test Z/ABDM: Climatic sequence, published by the European Committee for Electrotechnical Standard
7、ization (CENELEC). It is identical with IEC 68-2-61:1991 Environmental testing Part 2: Test methods Test Z/ABDM: Climatic sequence, published by the International Electrotechnical Commission (IEC). This standard supersedes BS2011-2.1Z/ABDM:1983 which will be withdrawn on1 September 1994. Additional
8、information. During the development of IEC68-2-61:1991, efforts were made by the Technical Committee, by way of National Committee comments, to ensure that its content aligned as far as possible with the existing BS2011-2.1Z/ABDM:1983 as this is widely prescribed in existing electrical and electroni
9、c component specifications; such as the detail and generic specifications in the BS9000 approval scheme. However, in reaching consensus some differences had to be accepted. With the exception of the two differences detailed below the Technical Committee believe that the changes made in this revision
10、 can be overcome by editorial amendment to the relevant specification. The attention of specification writers and users is drawn to the following differences which were considered to be important by a large majority of the participating National Committees. All components are subjected to one cycle
11、of test Db, damp heat, cyclic, between the dry heat and the low temperature tests. (In BS2011-2.1Z/ABDM:1983 components in the climatic categories -/-/04 and -/-/10 were not required to be subjected to a damp heat, cyclic test.) Following the low temperature test an interval not exceeding 72h is per
12、mitted before proceeding to the next step which is a damp heat, cyclic, test. However, if a low air pressure test is prescribed it should be carried out within that 72h interval. (BS2011-2.1Z/ABDM:1983 allowed an interval not exceeding 72h between the low temperature test and the low air pressure te
13、st and a further interval not exceeding 72h between the low air pressure test and the damp heat, cyclic test.) A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a Britis
14、h Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 12, an inside back cover and a back cover. This standard has been updated (see copyright date) and may hav
15、e had amendments incorporated. This will be indicated in the amendment table on theinside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60068-2-61 October1993 UDC621.3:620.193.21 Descriptors: Electricity, component, equipment, climatic test, composite test, dry heat, damp heat, lo
16、w air pressure, procedures, components specification writing, equipment specification writing English version Environmental testing Part 2: Test methods Test Z/ABDM: Climatic sequence (IEC 68-2-61:1991) Essais d environment Partie 2: Mthodes dessai Essai Z/ABDM: Squence climatique (CEI 68-2-61:1991)
17、 Umweltprfungen Teil 2: Prfverfahren Prfung Z/ABDM: Reihenfolge von klimatischen Prfungen (IEC 68-2-61:1991) This European Standard was approved by CENELEC on 1993-09-22. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Euro
18、pean 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 Secretariat or to any CENELEC member. This European Standard exists in three official versions (Eng
19、lish, 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 official versions. CENELEC members are the national electrotechnical committees of Austria,
20、 Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee
21、fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1993 Copyright reserved to CENELEC members Ref. No. EN 60068-2-61:1993 EEN60068-2-61:1993 BSI 03-1999 2 Foreword At the request of the CENELEC Reporting Secretariat SR50, the International Standard IEC68-2-61:1991
22、was submitted to the CENELEC Unique Acceptance Procedure (UAP) for acceptance as a European Standard. The text of the International Standard was approved by CENELEC as EN60068-2-61 on 22 September 1993. The following dates were fixed: Annexes designated “normative” are part of the body of the standa
23、rd. Annexes designated “informative” are given only for information. In this standard, Annex A and Annex B are informative and Annex ZA is normative. Contents Page Foreword 2 Introduction 3 1 Object 3 2 Normative references 3 3 Definitions 4 4 Test apparatus 4 5 Severities 4 6 Pre-conditioning 4 7 I
24、nitial measurements 4 8 Testing 4 9 Recovery 6 10 Final measurements 6 11 Information to be given in the relevant specification 6 Annex A (informative) Guidance for specification writers 7 Annex B (informative) Guidance for the conduct of the test 7 Annex ZA (normative) Other international publicati
25、ons quoted in this standard with the references of the relevant European publications 12 Figure 1 Methods 1 and 3 8 Figure 2 Method 2 (category -/-/56 only) 9 Figure 3 Example of use of recommended form for determining time schedule for method 1 (see B.1) 10 Figure 4 Diagrammatic representation of t
26、he progress of the climatic sequence 11 latest date of publication of an identical national standard (dop) 1994-09-01 latest date of withdrawal of conflicting national standards (dow) 1994-09-01EN60068-2-61:1993 BSI 03-1999 3 Introduction The value of a sequence of climatic tests, particularly for t
27、he testing of components, has been witnessed by the inclusion of a “climatic sequence” in IEC68-1 (see clause7 with guidance inAnnex B). With the increasing importance of the IEC Quality Assessment System for Electronic Components (IECQ) it has become necessary to define the test sequence more preci
28、sely than could be done in clause7 of IEC68-1 with the object of providing for satisfactory reproducibility of the test. This International Standard describes in detail a composite test specifying a “climatic sequence” for specimens of products, primarily components, that is based on clause7 of IEC6
29、8-1, and it includes guidance in informative annexes for specification writers and those performing the test. NOTETest Z/ABDM is a “composite test” as defined in IEC 68-1 rather than a “sequence” as defined in the same standard. Because of the well-established use of “sequence” in references to clau
30、se7 of IEC68-1 it has been decided that “sequence” should continue to be used in referring to the operations in this composite test. 1 Object This International Standard provides standard composite test methods for determining the suitability of a specimen when subjected to environmental conditions
31、consisting of a sequence of temperature, humidity and, where required, low air pressure environmental stresses. The order of application of the stresses and conditions for the change from one step to the next have been chosen to accelerate and amplify degradation mechanisms of the same type as those
32、 observed under natural climatic conditions. NOTEEnvironmental conditions occurring in nature are classified in IEC721-2 and IEC721-3. This standard may be applied to other electrotechnical products when the degradation mechanisms are the same and the specified requirements for testing can be satisf
33、ied. In other cases, it may form a basis for the writing of a similar test. In this test, specimens are exposed to environmental tests in a standard order and categorized according to the basic code defined in Appendix A of IEC68-1 except that the third group of digits is used as an indication of th
34、e number of cycles in Step5 of the damp heat cyclic Test Db according to clause6 in IEC68-2-30. In the climatic categories -/-/56, 40/-/-, etc., in this standard the dashes may be replaced by any of the standard values appropriate to the space as in the following examples:55/100/56, 25/085/56, 40/08
35、5/21. Where any modification is necessary, the relevant specification shall provide the necessary information for each step in the selected method (seeclause8). This test is frequently specified to follow other tests involving mechanical stress, for example tests for robustness of terminations, sold
36、erability, shock and vibration, as a means of determining whether the sealing of the specimen has been damaged. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, t
37、he editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of cu
38、rrently valid International Standards. IEC 68-1:1988, Environmental testing. Part 1: General and guidance. IEC 68-2-1:1990, Environmental testing. Part 2: Tests Tests A: Cold. IEC 68-2-2:1974, Environmental testing. Part 2: Tests Tests B: Dry heat. IEC 68-2-2A:1976, First supplement. IEC 68-2-13:198
39、3, Environmental testing. Part 2: Tests Test M: Low air pressure. IEC 68-2-28:1980, Environmental testing. Part 2: Tests Guidance for damp heat tests. IEC 68-2-30:1980, Environmental testing. Part 2: Tests Test Db and guidance: Damp heat cyclic (12 + 12-hour cycle). IEC 68-3-1:1974, Environmental te
40、sting. Part 3: Background information. Section 1 Cold and dry heat tests. IEC 68-3-1A:1978, First supplement. IEC 721-2, Classification of environmental conditions. Part 2: Environmental conditions appearing in nature. EN60068-2-61:1993 4 BSI 03-1999 IEC 721-3, Classification of environmental condit
41、ions. Part 3: Classification of groups of environmental parameters and their severities. 3 Definitions The terms used are generally defined in IEC68-5-2. 4 Test apparatus The test apparatus is that required for carrying out each of the individual tests, including variants and methods, with the requi
42、red severities prescribed for the sequence. When using a single test chamber in which the conditions specified for the different steps in the sequence are successively established, special care is necessary (see clauseB.3 ofAnnex B). The use of a test chamber with automatic transfer of the specimen
43、between compartments can, in general, be regarded as equivalent to the use of separate test chambers. Also, with test chambers with automatic transfer, it should be ensured that the recovery conditions at the end of each step are satisfied, particularly for step 2 of method 1 (see8.2.2). 5 Severitie
44、s The severity is defined by the temperature of the dry heat test (4.1 of IEC68-2-2), the temperature of the cold test (4.1 of IEC68-2-1), the air pressure and the duration of exposure, if the optional “low air pressure” step is required (clause4 in IEC68-2-13), and finally, the number of damp heat
45、cycles according to8.2.5 of this standard. 6 Pre-conditioning Unless otherwise prescribed by the relevant specification, pre-conditioning is required. The duration of preconditioning shall be at least 1h under standard atmospheric conditions for testing. 7 Initial measurements The specimen shall be
46、submitted to the visual, dimensional and functional checks prescribed by the relevant specification. 8 Testing 8.1 General description Three methods are standardized. Method1 is preferred and shall always be used unless otherwise prescribed by the relevant specification. In method1 the specimen is f
47、irst exposed to a high temperature and then to a cycle of damp heat. The damp heat cycle is immediately followed by a low temperature test so that any moisture which has entered either the specimen or surface cracks in its seals will be frozen and cause further damage. Low air pressure (optional) is
48、 then followed by further exposure to cyclic damp heat conditions (except for climatic categories-/-/04 and-/-/10) to complete the check on the sealing of the specimen. Method2 defines a more severe test which interposes a low temperature test between each of the five final damp heat cycles (climati
49、c category-/-/56 only). Method3 is intended to provide a short climatic sequence for lot by lot acceptance testing, applicable, where prescribed by the relevant specification, to electronic components of assessed quality. When recovery is specified, it shall, unless otherwise prescribed by the relevant specification, be under the standard atmospheric conditions for testing. 8.2 Method 1 This method contains five steps (seeFigure 1) of which one (step4 in8.2.4) is optional. 8.2.1 Step 1: Dry heat a) The specimen shall be exposed to
