The SMT chip inductance used in the process of SMT chip processing is generally composed of coils and magnetic cores. What we usually see is a closed type, and we cannot determine the quality of the chip inductance. It is generally believed that chip inductors are not damaged, but if used improperly, they can easily cause damage. The following is an introduction to the methods for detecting the inductance of a patch. Firstly, it is necessary to make a label on the chip inductor. There are two main methods for labeling: 1. Direct labeling method: directly mark the inductance, allowable error, and maximum working current of the inductance coil on the shell of the inductance coil using numbers and text. 2. Color coding method: Use a color ring to represent the inductance, in mH. The first and second digits represent significant digits, the third digit represents magnification, and the fourth digit represents the allowable deviation value. Next, you need a multimeter. Place the multimeter in the buzzer diode position, place the probes at both ends of the chip inductance, and observe the reading of the multimeter. The reading of the normal chip inductance should be zero. If the reading of the multimeter is too large or infinite, it indicates that the chip inductance has been damaged; Due to the large number of turns in the inductance coil, the reading of the number of coils with thin wire diameter can reach tens or thousands, and usually the DC resistance of the coil is only a few ohms. Inductive damage also manifests as scalding or obvious damage to the inductance magnetic ring. If the damage to the inductance coil is not very serious and cannot be determined, the inductance can be measured using an inductance meter or judged using a replacement method