IEC 60068-2-30:1980

01-23-2021 comment

IEC 60068-2-30:1980 pdf download. Environmental testing – Part 2: Tests. Test Db and guidance: Damp heat, cyclic (12 + 12-hour cycle).
It is recommended that Test Db should be used instead of Test D of IEC Publication 68-2-4 (Test D: Accelerated Damp Heat) for testing all newly designed articles.
To determine the suitability of components, equipment or other articles for use and storage under conditions of high humidity when combined with cyclic temperature changes and, in general, pro ducing condensation on the surface of the specimen.
2. 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 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 test severity is determined by the upper temperature of the cycle and the number of cycles (see Clause 4).
Test profiles illustrating the procedure are shown in Figures 1, 2a, 2b and 3, pages 14, 15, 16 and 17.
3. Testing chamber
The chamber shall be so constructed that the conditions given hereafter may be obtained;
3. I The temperature can be varied cyclically between 25±3″ and the appropriate upper temperature specified with the tolerance and rate of change specified in Sub-clause 6.3 and Figures 2a or 2b as applicable.
3.2 The relative humidity in the working space can be maintained within the limits given in Sub-clause 6.3 and in Figures 2a or 2b, as applicable.
3. 3 Care shall be taken to ensure that the conditions 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 air in the chamber should therefore be continuously stirred at a rate necessary to maintain the specified conditions of temperature and humidity.
5. Initial measurements
The specimens shall be visually inspected and electrically and mechanically checked, as required by the relevant specification.
6. 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 is prescribed, the thermal conduction of the mounting shall be ow that for all practical purposes the specimen is thermally isolated.IEC 60068-2-30:1980 pdf download.

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