degradation failure การใช้

• Near the end of the capacitor's lifetime degradation failure begins to appear.
• Parameters of the tested component beyond these limits can be counted as evidence of degradation failure.
• Variations over the course of time which exceed the specified values are considered as a degradation failure.
• Failures are short circuits, open circuits and degradation failures ( exceeding specified limits of electrical parameters ).
• Failures totalized in a failure rate are short circuit, open circuit, and degradation failures ( exceeding electrical parameters ).
• The specified limits for polymer capacitor degradation failures are much closer than for non-solid Al-e-caps.
• Failure types included in the total failure rate are short circuit, open circuit, and degradation failures ( exceeding electrical parameters ).
• The  end of life point is defined by the appearance of wear-out failures or degradation failures when either capacitance, impedance, ESR or leakage current exceed their specified change limits.
• The capacitance should normally degrade to as low as 70 % of the rated value, and the ESR increase to twice the rated value, over the normal life span of the component, before it should be considered as a " degradation failure ".
• After this endurance test the specified parameter limits to pass the test are, on the one hand, no total failures ( short circuit, open circuit ) and on the other hand, not reaching degradation failure, a reduction of capacitance over 30 % and an increase of the ESR, impedance or loss factor by more than a factor of 3 compared to the initial value.