Film capacitors reading method

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

For example, the 684 on the film capacitors uses the digital counting method. This counting method is generally a 3-digit number. The one digit on the left and the one digit in the middle are numbers, and the digit on the right is a multiple, that is, 10ⁿ. No unit is indicated, generally the default is pF. If it is a number with a decimal point and no unit is indicated, the unit is μF.

The reading of the film capacitors is similar to the reading of the color ring resistance. The first two digits of the three digits are coefficients, and the latter is an index of 10. 104 is 10 × 10⁴, equal to 100000pF, which is 100nF.

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