1. The capacitance is generally indicated by "C" plus a number in the circuit (e.g., C25 indicates the capacitance numbered 25).
A capacitor is a component composed of two metal films close to each other and separated by an insulating material in the center. The characteristic of the capacitor is first and foremost the communication through the DC block. The size of the capacitance is the size of the capacitance that can store electrical energy, and the blocking effect of the capacitance on the communication signal is called capacitive reactance, which is related to the frequency and capacitance of the communication signal.
Capacitive reactance XC=1/2πf c (f indicates the frequency of the communication signal, C indicates the capacitance capacity)
2. Capacitance identification method
The identification method of capacitance is basically the same as that of resistor, and there are three types: direct standard method, color mark method and number mark method. The basic unit of capacitance is indicated by farad (F), and other units are: millimethod (mF), micromethod (uF), nanomethod (nF), picomethod (pF).
In between: 1 farad = 103 millifa = 106 microfa = 109 nanofa = 1012 picofar
Capacitors with large capacitances have capacitance values that are indicated directly on the capacitor, e.g. 10 uF/16V
A capacitor with a small capacitance has a capacitance value indicated by a letter on the capacitance or a number indicating 6
Letter indication method: 1m = 1000 uF 1P2 = 1.2PF 1n = 1000PF
Numerical indication method: generally use three digits to indicate the size of the capacity, the first two digits indicate useful numbers, and the third digit is the magnification.
For example, 102 indicates 10×102PF=1000PF 224 indicates 22×104PF=0.22 uF
3. Capacitance capacitance error table
Symbol F G J K L M
Error ±1% ±2% ±5% ±10% ±15% ±20%
For example, if the capacitance of a ceramic tile is 104J, the capacitance is 0. 1 uF with an error of ±5%.
4. Characteristics of the problem
In practical maintenance, the problems of capacitors are mainly manifested as: (1) Open circuit problems caused by pin corrosion.
(2) The problem of open circuit of desoldering and virtual soldering. (3) Leakage causes small volume or open circuit problems.
(4) Leakage, severe leakage and breakdown problems.
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