How to identify the ceramic capacitor parameters (II)

Several methods of capacity identification of capacitors:

Direct identification: such as its electrolytic capacitor, capacity 47uf, capacitor withstand voltage 25v.

Use unit nf: polyester capacitor as shown above, nominal 4n7, ie 4.7nf, converted to pf is 4700pf. Also for example: 10n, ie 0.01uf; 33n, ie 0.033uf. The latter 63 refers to the capacitor withstand voltage of 63v.

Mathematical counting method: such as ceramic dielectric capacitor, the value of 104, the capacity is: 10X10000pf = 0.1uf. If the value is 473, it is 47X1000pf=0.047uf. (The following 4, 3, all indicate how many times 10). Another example: 332 = 33X100pf = 3300pf. The use of capacitors should work at the specified withstand voltage. A lot of low-quality products are now causing malfunctions due to the use of capacitors with insufficient voltage (common capacitor burst).

How to identify the ceramic capacitor parameters _How to read the ceramic capacitor

Capacitance identification:

The capacitor is generally represented by a "C" plus a number in the circuit (for example, C13 represents a capacitor numbered 13). The capacitor is an element consisting of two metal films abutting and separated by an insulating material. The characteristics of the capacitor are mainly DC-blocking AC. The size of the capacitor capacity is the size of the energy that can be stored. The blocking effect of the capacitor on the AC signal is called capacitive reactance, which is related to the frequency and capacitance of the AC signal. Capacitive reactance XC=1/2πfc (f indicates the frequency of the AC signal, C indicates the capacity of the capacitor) The types of capacitors commonly used in telephones are electrolytic capacitors, ceramic capacitors, chip capacitors, monolithic capacitors, tantalum capacitors, and polyester capacitors.

Capacitance identification method: The identification method of the capacitance is basically the same as the identification method of the resistance, and there are three kinds of methods: the direct label method, the color scale method and the number standard method. The basic unit of the capacitance is pulled (F), and other units are: millifarad (mF), microfarad (uF), nanofarad (nF), and picofarad (pF). Among them: 1 Farad = 10, 3 millifarads = 10, 6 microfarads = 10, 9 nanofarads = 10, 12 picofarad capacity capacitors whose capacitance values are directly indicated on the capacitor, such as 10uF/16V capacitors with small capacitance The capacity value is represented by letters or numbers on the capacitor. The letter representation: 1m=1000uF, 1P2=1.2PF, 1n=1000PF, digital notation: generally uses three digits to indicate the capacity, the first two digits represent the effective number, and the third The digit number is the magnification. For example: 102 means 10 & TImes; 102PF = 1000PF224 means 22 & TImes; 104PF = 0.22uF.

Capacitance capacity error table: The error of the symbol FGJKLM is ±1%±2%±5%±10%±15%±20%; for example, a ceramic capacitor of 104J indicates a capacity of 0.1uF and an error of ±5%.

Detailed method for identifying the specifications of the ceramic capacitor:

1000V-6000V high frequency ceramic capacitor. High-frequency ceramic capacitors are generally used in circuits with higher stable oscillations, so their stability requirements are relatively high. For example, the common coupling capacitors and high-voltage bypasses will use high-frequency ceramic capacitors. . The main advantage is that it can withstand high temperatures and wear resistance. For example, high-voltage ceramic capacitors are used in TV receivers that are common in daily life.

Specification 2: Low frequency ceramic capacitor below 50V

Low-frequency ceramic capacitors are mainly used in some circuits with relatively low operating frequencies. In this type of loop, the stability of the capacitors and the degree of loss are often not very high. Especially in some circuits with relatively strong pulses, low-frequency ceramic capacitors cannot be used, otherwise it is likely to be directly broken down by voltage.

Comparison of the differences between the two:

The identification of different types of ceramic capacitors can be judged directly by capacitors or circuits. Generally speaking, it can withstand high voltage, has better insulation and is more reliable. It is a high-frequency ceramic capacitor used in high-voltage circuits. Low-frequency ceramic capacitors are relatively low in reliability and cost, and are often used in capacitors such as low-frequency circuits and coupling circuits.