IEC 60068-2-30:1980 pdf download.Basic environmental testing procedures Part 2: Tests Test Db and guidance: Damp heat, cyclic (12 + 1 2-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.
1. Scope
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, producing condensation on the surface of the specimen.
2. General descripion
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 arc 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.
3. Testing chamber
The chamber shall be so constructed that the conditions given hereafter may be obtained:
3.1 The temperature can be varied cyclically between 25±3 °C 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.
3. Testing chamber
The chamber shall be so constructed that the conditions given hereafter may be obtained:
3.1 The temperature can be varied cyclically between 25±3 °C 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.IEC-60068-2-30-1980