RELIABILITY TESTING METHOD OF CAPACITOR AND TESTING UNIT

摘要

PROBLEM TO BE SOLVED: To provide a reliability test method of a capacitor for diagnosing deterioration in ages without detaching the capacitor to be tested during testing time. SOLUTION: In a circuit, a capacitor 5 to be tested and a DC power supply 1 for applying a DC current to the capacitor 5 are connected with a resistor 4 in between. The circuit comprises a control circuit 6 for applying the DC current intermittently at given timing to the capacitor 5 to be tested, and a time judgment circuit 7 that is synchronized with the intermittent cycle of the DC voltage for detecting and judging a voltage rising time or a voltage falling time. When the DC voltage is applied intermittently, the voltage rising time or the voltage falling time is detected and, on the basis of the result, a deterioration in ages of the capacitor 5 is judged.