Patent ID: 6448525
Filing Date: 2002-09-10
Classification: B07C,B65B,Y10S

Abstract:
A capacitor characteristic measuring apparatus, comprising:means for applying a DC voltage to a capacitor; and means for discriminating the quality of the capacitor from charge characteristics of the capacitor at an initial charge period, said quality discriminating means including: a charge current measurement section for measuring an initial current value in a charge region of a dielectric polarization component of the capacitor; setting means for setting a standard selection value charge characteristic of a dielectric polarization component of the capacitor; and judging means for judging the quality of the capacitor by comparing the initial measured current value of the dielectric polarization component of the capacitor and the standard selection value charge characteristic, said judging means including: means for executing quadratic curve approximation to either one of the ratio of an actual measured value m(t) of the held capacitor and a calculated current value j(t) determined from the standard selection value charge characteristics, the difference between m(t) and j(t), the difference between the logarithm value of m(t) and the logarithm value of j(t), or the ration of the logarithm value of m(t) to the logarithm value of j(t); and means for judging the quality of the capacitor depending on whether a secondary coefficient of the quadratic curve approximation is negative or positive.