IEC 60068-2-61:1991 pdf

01-15-2021 comment

IEC 60068-2-61:1991 pdf download.Environmental testing – Part 2-61: Test methods – Test Z/ABDM:Climatic sequence.
IEC 60068-2-61:1991 provides standard composite test methods for determining the liability 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 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 standard may be applied to other electrotechnical products when the degradation mechanisms 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 a standard order and categorized according to the basic code defined in Appendix A of EC 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–/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, 40085/21 Where any modification is necessary, the relevant specification shall provide the necessary information for each step in the selected 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.
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 specified for the different steps in the sequence are successively established, special care is necessary(see clause B.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. 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).IEC 60068-2-61:1991 pdf download.

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