1、 - m 3404583 00894LL 505 = EUROPEAN STANDARD EN 60068-2-61 NORME EUROPENNE EUROPISCHE NORM October 1993 I )est-riptms: Electricity, coniponent, eqiiipinent, climatic test, composite test, dry heat, daiiip lieat, low air pressure, procediires, components specification writing, equipment specification
2、 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 ZiABDM: Squence climatique (CE1 68-2-61 : 1991) Umweltprfungen Teil 2: Prfverfahren Prfung Z/ABDM: Reihenfolge von klimatischen
3、Prfungen (IEC 68-2-61 : 1991) This European Standard was approved by CENELEC on 1893-09-22. CENELEC members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-d
4、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
5、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, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, L
6、uxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fiir Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050
7、Brussels CJ 1993 Copyright reserved to CENELEC meinbeis Ref. No. EN 60068-2-61 : 1903 E 3404503 0089412 441 W Page 2 EN 60068-2-61 : 1993 Foreword At the request of the CENELEC Reporting Secretariat SR 50, the International Standard IEC 68-2-61 : 1991 was submitted to the CENELEC Unique Acceptance P
8、rocedure (UAP) for acceptance as a European Standard. The text of the International Standard was approved by CENELEC as EN 60068-2-61 on 22 September 1993. The following dates were fixed: - latest date of publication of an identical national standard (dop) 1994-09-01 - latest date of withdrawal of c
9、onflicting national standards (dow) 1994-09-01 Annexes designated normative are part of the body of the standard. Annexes designated informative are given only for information. In this standard, annexes A and B are informative and annex ZA is normative. - . - - 3404583 0089433 388 W Page 3 EN 6068-2
10、-61 : 1993 CONTENTS INTRODUCTION clause 1 2 3 4 5 6 7 8 9 10 11 object Normative references Definitions . Test apparatus . severities “ Pre-canditioning . Initiai measurements . Testing . Recuvery . Finai measurements Information to be given in the relevant speciricatian AnWXeS A . Guidance for spec
11、ification writers B . Guidance for the conduct of the test ZA Other international publications quoted in this standard with the references of the relevant European publications page 4 5 5 6 6 7 7 7 7 10 10 11 12 13 18 Page 4 EN 60068-2-61 : 1993 INTRODUCTION The value of a sequence of climatic tests
12、, particularly for the testing of components, has been witnessed by the inclusion of a “climatic sequence“ in IEC 68-1 (see clause 7 with guidance in annex B). With the increasing importance of the IEC Quality Assessment System for Electronic Com- ponents (IECQ) it has become necessary to define the
13、 test sequence more precisely than could be done in clause 7 of IEC 68-1 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
14、is based on clause 7 of IEC 68-1, and it includes guidance in informative annexes for specification writers and those performing the test. NOTE - Test UABDM 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 seq
15、uence“ in references to clause 7 of IEC 68-1 It has been decided that “sequence should continue to be used in referring to the operations in this composite test. W 3404583 0089415 150 W Page 5 EN 600682-61 : 1993 ENVIRONMENTAL TESTING Part 2: Test methods - Test Z/ABDM: Climatic sequence 1 Object Th
16、is International Standard provides standard composite test methods for determining the suitability of a specimen when subjected to environmental conditions consisting of a sequence of temperature, humidity and, where required, low air pressure environmental stresses. The order of application of the
17、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 observed under natural climatic conditions. NOTE - Environmental conditions occurring in nature are classified in IEC 721-2 and IEC 721-3. This
18、 standard may be applied to other electrotechnical products when the degradation me- chanisms are the same and the specified requirements for testing can be satisfied. 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
19、 a standard order and categorized according to the basic code defined in Appendix A of IEC 68-1 except that the third group of digits is used as an indication of the number of cycles in Step 5 of the damp heat cyclic Test Db according to clause 6 in IEC 68-2-30. In the climatic categories 4456, 40/-
20、/-, 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, 40/085/21. Where any modification is necessary, the relevant specification shall provide the necessary information for each step in the sel
21、ected method (see clause 8). This test is frequently specified to follow other tests involving mechanical stress, for example tests for robustness of terminations, solderability, shock and vibration, as a means of determining whether the sealing of the specimen has been damaged. 2 Normative referenc
22、es The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Stand
23、ard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. Page 6 EN 6068-2-61 : 1993 IEC 68-1 : 1988: Environmental testing. Part I: General and guidan
24、ce. IEC 68-2-1 : 1990, Environmental testing. Part 2: Tests - Tests A: Cold. IEC 68-2-2: 1 974, Environmental testing. Part 2: Tests - Tests B: Dry heat. IEC 68-2-2A: 1 976, first supplement. IEC 68-2-1 3: 1983, Environmental testing. Part 2: Tests - Test M: Low air pressure. IEC 68-2-28: 1980, Envi
25、ronmental testing. Part 2: Tests - Guidance for damp heat tests. IEC 68-2-30: 1980, Environmental testing. Part 2: Tests - Test D6 and guidance: Damp heat cyclic (12 + 12-hour cycle). IEC 68-3-1 : 1974, Environmental testing. 1 Cold and dry heat tests. IEC 68-3-1 A: 1978, First supplement. IEC 721 -
26、2, Classification of environmenta appearing in nature. art 3: Background information. Section One - conditions. Part 2: Environmental conditions IEC 721 -3, Classification of environmental conditions. Part 3: Classification of groups of environmental parameters and their severities. 3 Definitions Th
27、e terms used are generally defined In IEC 68-5-2. 4 Test apparatus The test apparatus is that required for carrying out each of the individual tests, including variants and methods, with the required severities prescribed for the sequence. When using a single test chamber in which the conditions spe
28、cified for the different steps in the sequence are successively established, special care is necessary (see clause 8.3 of annex B). The use of a test chamber with automatic transfer of the specimen between compartments can, in general, be regarded as equivalent to the use of separate test chambers.
29、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 (see 8.2.2). M 3404583 0089417 T23 Page 7 EN -8-2-61 : 1993 5 Severltles The seventy is defined by the temperature of the dry
30、 heat test (4.1 of IEC 68-2-2), the temperature of the cold test (4.1 of IEC 68-2-I), the air pressure and the duration of exposure, if the optional “low air pressure“ step is required (clause 4 in IEC 68-2-13), and finally, the number of damp heat cycles according to 8.2.5 of this standard. 6 Pre-c
31、onditioning Unless otherwise prescribed by the relevant specification, pre-conditioning is required. The duration of preconditioning shall be at least 1 h under standard atmospheric conditions for testing. 7 Initial measurements The specimen shall be submitted to the visual, dimensional and function
32、al checks prescribed by the relevant specification. 8 Testing 8.1 G81?8fa/ description Three methods are standardized. Method 1 is preferred and shall always be used unless otherwise prescribed by the relevant specification. In method 1 the specimen is first exposed to a high temperature and then to
33、 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 then followed by further exposure to cyclic d
34、amp heat conditions (except for climatic categories -/-/O4 and -Hl O) to complete the check on the sealing of the specimen. Method 2 defines a more severe test which interposes a low temperature test between each of the five final damp heat cycles (climatic category -/-/56 only). Method 3 is intende
35、d 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 a
36、tmospheric conditions for testing. Page 8 EN 60068-2-61 : 1993 8.2 Method 1 This method contains five steps (see figure 1) of which one (step 4 in 8.2.4) is optional. 8.2.1 Step 1: Dry heat a) The specimen shall be exposed to the dry heat test Ba according to clause 7 of IEC 68-2-2 with a duration o
37、f exposure of 16 h f 0,5 h. The temperature shall be prescribed by the relevant specification, preferably by stating the climatic category. The relevant specification may prescribe intermediate measurements at the end of the exposure to high temperature according to clause 8 of IEC 68-2-2; the time
38、taken by these measurements does not form part of the duration of exposure. b) The specimen shall then be removed from the chamber and at least 1 h shall be allowed for recovery and the completion of step 1. The total duration of step 1 is 24 h f 0,5 h. c) An interval not exceeding 72 h (3 days) is
39、permitted before proceeding to step 2. The conditions during this interval are those for recovery, that is, the standard atmospheric conditions for testing. 8.2.2 Step 2: Damp heat a) Specimens shall be exposed to one cycle of the damp heat cyclic test Db according to clause 6 of IEC 68-2-30. Unless
40、 otherwise prescribed by the relevant specification variant 1 shall be used. The upper temperature shall be 55 OC unless otherwise prescribed by the relevant specification. b) Recovery shall then take place according to clause 8 of IEC 68-2-30. c) Immediately after the recovery period, the specimen
41、shall be subjected to step 3. 8.2.3 Step 3: Cold a) The specimen shall be exposed to the cold test Aa according to clause 7 of IEC 68-2-1. The temperature shall be prescribed by the relevant specification, preferably by stating the climatic category, with a duration of exposure of 120 min f 5 min. T
42、he relevant specification may prescribe intermediate measurements at the end of the exposure to cold according to clause 8 of IEC 68-2-1 ; the time taken by these measure- ments does not form part of the duration of exposure. b) The specimen shall then be removed from the chamber and recovery shall
43、take place according to clause 9 of IEC 68-2-1. c) An interval not exceeding 72 h (3 days) is permitted before proceeding to step 5. The conditions during this interval are those for recovery; however, when prescribed by the relevant specification, the optional step 4 shall be performed during this
44、interval. -= m 3404583 0089439 8Tb m Page 9 EN 60068-2-61 : 1993 8.2.4 a) When prescribed by the relevant specification (see 8.2.3c), specimens for climatic categories 401-I-, 551-1- and 651-/- shall be exposed to the low air pressure test M according to IEC 68-2-13. The severity shall be that presc
45、ribed by the relevant specification. Testing shall be at a temperature between 15 OC and 35 OC with a duration of exposure of 60 min f 5 min unless otherwise prescribed by the relevant specification. Step 4 (optional): Low air pressure When prescribed by the relevant specification, an electric stren
46、gth test shall be performed during the last 5 min of exposure, with the prescribed test voltage and procedure. b) The recovery period shall be between 1 h and 2 h. 8.2.5 Step 5: Damp heat a) The conditions for testing shall be in accordance with 8.2.2a). Unless otherwise prescribed by the relevant s
47、pecification, the number of cycles shall be determined by the climatic category as follows: Climatic category -1-104 and -1-110 not applicable -1-121 1 cycle -1-156 5 cycles b) When prescribed by the relevant specification, the specimen which has been tested according to 8.2.5a) shall be removed fro
48、m the chamber on the completion of the prescribed number of cycles, shaken to remove droplets of water and then, within 15 min of removal from the chamber, shall be submitted to the visual, dimensional and functional checks prescribed by the relevant specification. c) After recovery of between 1,5 h
49、 and 2 h, the specimen shall be submitted to the visual, dimensional and functional checks prescribed by the relevant specification. d) When an extended recovery is prescribed by the relevant specification, the specimen shall be allowed to recover for an additional period of 24 h f 0,5 h. It shall then be submitted to the visual, dimensional and functional checks prescribed by the relevant specification. 8.3 Method 2 This method is applicable only to specimens for climatic category -/-I56 when prescribed by the relevant specification (s
