(1) The manifestations of inductor damage: short circuit, open circuit, etc.

      (2) Use a multimeter to judge whether the inductor is good or not.

      The method to detect the inductor with a pointer multimeter: first, set the multimeter to "R" of the ohm scale × In gear 1 ", the two probes are connected to the two pins of the inductor, and a fixed resistance value can be measured under normal conditions. If the meter pin does not move, it indicates that there is an internal circuit break in the inductor. If the meter pin indicates a trend of 0 Ω, it indicates that there is a short circuit in the inductor; Then set the multimeter to "R × 10K "gear, check the insulation of the inductor, measure the resistance between the coil lead and the iron core or metal shield, which should be infinite, otherwise the inductor has poor insulation; Finally, check the structure of the inductor. The winding of a good inductor coil should not be loose or deformed. The leading out end should be fixed firmly. The magnetic core can rotate flexibly without loosening. Otherwise, the inductor may be damaged.

      The method of detecting inductor with digital multimeter: turn the range switch of digital multimeter to the appropriate inductance gear; Then connect two pins of the inductor with two probes to display the inductance of the inductor on the display screen. If the displayed inductance is close to the nominal inductance, the inductor is normal; If the displayed inductance is much different from the nominal value, it indicates that the inductor is faulty.

      (3) Generally damaged inductors shall be replaced with inductors with the same nominal inductance and current