[Knowledge Academy] Representation of winding inductance and good or bad measurement

The inductor is usually represented by "L" plus a number in the circuit. For example, L6 represents the inductor numbered 6. The inductor coil is made by winding the insulated wire around the insulated bobbin by a certain number of turns. DC can pass through the coil. The DC resistance is the resistance of the wire itself. The voltage drop is very small. When the AC signal passes through the coil, the self-induced electromotive force will be generated at both ends of the coil. The direction of the self-induced electromotive force is opposite to the applied voltage, which hinders the AC. Pass, so the characteristic of the inductor is DC resistance AC, the higher the frequency, the greater the coil impedance. The inductor can form an oscillating circuit with the capacitor in the circuit. Inductors generally have a straight-label method and a color-code method, and the color-code method is similar to a resistor. Such as: brown, black, gold, gold means 1uH (error 5%) of the inductance.
The quality of the inductor is measured. The quality of the inductor includes the appearance and resistance measurement. Firstly, check whether the appearance of the inductor is intact, whether the magnetic has defects, cracks, corrosion of the metal part, whether the mark is complete and clear, whether the wiring is broken or not. Demolition, etc. Use a multimeter to make a preliminary test of the inductance, measure the DC resistance of the coil, and compare it with the original known normal resistance value. If the detected value is significantly larger than the normal value, or the pointer does not move, it may be the inductor body. Open circuit. If it is much smaller than the normal value, it can be judged that the inductor body is severely short-circuited, and the partial short circuit of the coil needs to be detected by special instruments. Copyright: http:// (Pingshang Technology) Please indicate the source. May 8, 2013 Editorial Department Xiaoyan

Solar Footlight

Solar Footlight,Waterproof Led Flood Light,Effciency Solar Flood Light,High Effciency Solar Flood Light

JIANGMEN MOSCOT OPTOELECTRONIC TECHNOLOGY CO.,LTD. , https://www.jmsensorsled.com