Film capacitors FAQ

Metallized plastic film capacitors can be placed as the environmental conditions, the change of electrical characteristics is generated, is placed in a natural situation, the air saturated with moisture will produce a small capacitance change, and the change in capacity is based on the degree of dielectric material there are differences, structure and other exterior materials. 
    1.Occurs when the noise capacitors, dielectric film is due to AC power through the body of the role of the mechanical vibrations occur between the thin-film diode, and noise problems, especially voltage instability or voltage surge or used in high frequency , will produce higher sound vibrations, but does not in itself affect the electrical characteristics of the capacitor, and the different manufacturing batches, the volume of noise frequency will change, must be confirmed and the use of audible murmur of acceptance. 
      2.Capacitors need to avoid voltage, temperature rapidly changing environment, if not exceed the rating of the capacitor, both will cause rapid deterioration of the quality of the capacitors. 
    3.Capacitors used in the circuit, there is rapid or frequent charging and discharging, special frequency as high or different atmospheric pressure, etc., must be confirmed capacitor applicability. 
      4.Capacitor voltage test, when life test, when shall variety of capacitors in parallel, series resistance capacitor sure. 
     5.Capacitors withstand over-voltage or over-temperature anomalies product life of the late, causing damage to the insulation material, the capacitor may produce smoke burned. To prevent this situation, you must use protective type of capacitor, the capacitor and the circuit is open when an exception occurs, to protect the results.