(1) For high frequency resonant circuit, in addition to the requirement of small capacitor loss, the capacity is also required to have good temperature stability, usually choose 1 type of porcelain dielectric capacitor, whose capacity basically does not change with temperature, but its capacity is only between a few PF ~ several hundred PF.
(2) For the capacitors to do low frequency coupling, bypass and filtering, small size and low cost are often considered as the main ones, and the temperature stability of loss and capacity is not required, so generally 2 types of porcelain dielectric capacitors can be used, with a wide range of capacity selection.
(3) Although the voltage tolerance of ceramic capacitors is larger than that of film capacitors and electrolytic capacitors, they are not allowed to be used under the condition of exceeding their rated voltage, otherwise the migration speed of metal ions in the electrode under the action of strong electric field and then in the ceramic medium will lead to the decrease of insulation resistance of the capacitor and affect the long-term reliability of the machine.
(4) for high temperature and high voltage conditions of the capacitor, should pay attention to the use of high insulation resistance products, to prevent leakage increases due to the vicious cycle of capacitor failure. Usually insulation resistance IR ≥ 10000MΩ. for example: in the CRT acceleration pole filter position should be selected with sufficient insulation resistance; for line reverse circuit, because of the capacity of the stability and loss requirements are high, can only use a class 1 high-voltage porcelain capacitor, as a polypropylene capacitor capacity compensation capacitor, otherwise it will cause serious quality risks.
14D270K Warystor z tlenku cynku z warstwą żywicy epoksydowej

14D270K Warystor z tlenku cynku z warstwą żywicy epoksydowej

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