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 an element composed of two metal films that are placed next to each other and separated by an insulating material. The characteristic of the capacitor is first and foremost the communication through the DC block. The capacitance capacity is the size of the capacitor that can store electrical energy, 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).
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: 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
Allowable 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. Fault characteristics
In the actual maintenance, the main problems of the capacitor are: (1) The open circuit fault caused by pin corrosion.
(2) Open circuit defects of desoldering and virtual welding. (3) After leakage, the volume is small or the open circuit is formed.
(4) Leakage, serious leakage and breakdown problems.
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