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 consisting of two metal films close to each other and separated by an insulating material in the center. The characteristic of the capacitor is mainly to communicate through the DC block. The size of the capacitance is to indicate the size of the energy that can be stored, and the blocking effect of the capacitor 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).
Wherein: 1 farad = 103 millifa = 106 microfarat = 109 nanofa = 1012 picofara
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: Generally, three digits are used to indicate the size of the capacity, the first two digits indicate significant figures, and the third digit is the magnification.
For example, 102 indicates 10×102PF=1000PF 224 indicates 22×104PF=0.22 uF
3. Capacitance capacity 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, error of ±5%.
4. Characteristics of the problem
In the actual repair, the fault of the capacitor is mainly manifested as: (1) The open circuit problem 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, serious leakage and breakdown problems.
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