Inductance is a basic electronic component, also known as inductor or coil, and is often used in circuits. Its main function is to store electrical energy in the circuit and resist current changes. The inductance is made of winding. When the current passes through the inductor, a magnetic field will be generated in the winding to store electrical energy. When the current changes, the inductor will produce the induced electromotive force to resist the change of the current. The unit of inductance is Henry, and the common symbol is H. According to the purpose and structure, inductors can be divided into different types, including hollow coil inductors, iron core coil inductors, transformers, etc. Inductance plays the role of filtering, impedance matching, oscillator, transformer, etc. in the circuit. In a DC circuit, the inductor will hinder the instantaneous change of current; in an AC circuit, the inductor will form an impedance and affect the frequency response of the circuit. The characteristics of the inductor include the inductance value (Henry), the series resistance of the inductor (determined by the coil wire resistance), the mass factor of the inductor (Q value, reflecting the loss of the inductor), the self-resonant frequency, etc.

Inductors have cracks, crashes, poor materials, loose leads, poor materials, leakage welding, cold welding, tin stacking, wire wrap loose wire, poor electroplating and other defects in the production process. Sptek recommends the appearance detection of cloud disk high-speed visual detection equipment. 

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Detection effect 

 Collapse

Crack

 材料不良

The lead is loose.

The wire bag is loose

Cold welding

Continuous tin