Film capacitance reading method

The film capacitor is a capacitor in which a metal foil is used as an electrode, and a plastic film such as polyethylene, polypropylene, polystyrene, or polycarbonate is overlapped from both ends and wound into a cylindrical structure. According to the type of plastic film, they are also called polyethylene capacitor (also called Mylar capacitor), polypropylene capacitor (also called PP capacitor), polystyrene capacitor (also called PS capacitor) and polycarbonate capacitor.

For example, 684 on the film capacitor uses a digital counting method. This counting method is generally a 3-digit number. The left one and the middle one are numbers. The right one is a multiple, which is 10 To the power, if no unit is specified, the default is pF. If it is a number with a decimal point and no unit is specified, the unit is uF.

The reading method of the film capacitor is similar to that of the color ring resistor. The first two digits of the three digits are the coefficients, and the second digit is the exponent of 10. 104 is the fourth power of 10 times 10, which is equal to 100,000pF, which is 100nF.

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