According to 62391-1 © IEC:2006(E), the capacitors (including supercaps, high voltage capacitor, auto capacitors ) shall be subjected to the procedures of the dry heat and cold test (4.17.2 and 4.17.3 respectively) with the following details:
- The degree of severity for these tests shall be the same as for the dry heat and cold tests. Tests at intermediate temperatures may be prescribed by the relevant specification.
Measurements shall be made at each of the specified temperatures after the capacitor has reached thermal stability.
The condition of thermal stability is judged to be reached when two readingd of a characteristic, taken in an interval of not less than 5 min, do not differ by an amount greater than that which can be attributed to the measuring apparatus.
- Dry heat
The capacitors shall be subjected to Test Ba of IEC 60068-2-2 for 16 h, using the degree of severity of the upper category temperature, as prescribed in the detail specification.
While still at the specified high temperature and at the end of high temperature, the measurements prescribed in the relevant specification shall be made.
After the specified conditioning, the capacitors shall be removed from the chamber and exposed to standard atmospheric conditons for not less than 4 h.
The capacitor shall be subjected to Test Aa of IEC 60068-2-1 for 2 h, using the degree of severity of the lower category temperature, as prescribed in the relevant specification.
While atill specified conditoning ,the capacitors shall be removed from the chamber and exposed to standard atmospheric conditons for testing for not less than 4 h.
4 The capacitors shall not exceed the limits perscribed in the relevant specification.
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