The nominal ampacity is the ampacity marked on the amperometric capacitor.　　The basic unit of amperometric capacitor is Farad, abbreviated as Fa (F), however, this unit is too large and rarely used in the field labeling.　　Other unit relationships are as follows: 1F=1000mF 1mF=1000μF 1μF=1000nF 1nF=1000pF
　The nominal ampacity is the ampacity marked on the amperometric capacitor.　　The basic unit of amperometric capacitor is Farad, abbreviated as Fa (F), however, this unit is too large and rarely used in the field labeling.　　Other unit relations are as follows: 1F=1000mF 1mF=1000μF 1μF=1000nF 1nF=1000pF The deviation of the actual amperometric capacitance and the nominal amperometric capacitance of the amperometric capacitor is called error, and the deviation range in the allowed deviation is called accuracy.　　Accuracy level corresponds to the allowable error: 00 (01) – ±1%, 0 (02) – ±2%, Ⅰ – ±5%, Ⅱ – ±10%, Ⅲ – ±20%,
Ⅳ-(+20%-10%), V-(+50%-20%), VI-(+50%-30%) Commonly used Ⅰ, Ⅱ, Ⅲ grade for general safety gauge capacitors and Ⅳ, Ⅴ, VI grade for electrolytic safety gauge capacitors, selected according to the usage. Introduction of various kinds of safety gauge capacitors Rated voltage can be continuously added to the high DC voltage rms of safety gauge capacitors at low ambient temperature and rated ambient temperature, which is usually marked directly on the case of safety gauge capacitors. If the working voltage exceeds the withstand voltage of safety gauge capacitors, the safety gauge capacitors break down and cause irreparable damage. Insulation resistance The ratio of the DC voltage applied to the capacitor and the leakage current generated is called insulation resistance.
　　For ceramic capacitors and film capacitors, the larger the insulation resistance, the better, while for aluminum electrolytic capacitors, the smaller the insulation resistance, the better.　The time constant of the capacitor: In order to properly evaluate the insulation of large capacity capacitors, the time constant is introduced, which is equal to the product of the insulation resistance and capacity of the capacitor.
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