Main characteristic parameters of capacitors

1. Nominal capacitance and tolerance

The nominal capacitance is the capacitance marked on the capacitor. The deviation between the actual capacitance of the capacitor and the nominal capacitance is called the error, and the deviation within the allowable range is called the accuracy. Correspondence between accuracy grade and allowable error: 00(01)-±1%, 0(02)-±2%, Ⅰ-±5%, Ⅱ-±10%, Ⅲ-±20%, Ⅳ-(+20% -10%), Ⅴ-(+50%-20%), Ⅵ-(+50%-30%)

General capacitors are commonly used in grades I, II, and III, and electrolytic capacitors are used in grades IV, V, and VI, which are selected according to the application.

2. Rated voltage

The highest effective value of DC voltage that can be continuously applied to the capacitor at the lowest ambient temperature and the rated ambient temperature is generally marked directly on the capacitor shell. If the working voltage exceeds the withstand voltage of the capacitor, the capacitor will break down, causing irreparable permanent damage. damage.