Inductance judgment

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Inductance judgment

1. Inductance measurement: Turn the multimeter to the buzzer diode and place the test leads on the two pins to see the reading of the multimeter.

2. Good or bad judgment: For the chip inductor, the reading at this time should be zero. If the multimeter reading is too large or infinite, the inductance is damaged.

For the number of turns of the inductor coil, the coil diameter of the coil will be several tens to hundreds of times. Usually, the DC resistance of the coil is only a few ohms. The damage is manifested as obvious damage to the hot or inductive magnetic ring. If the induction coil is not seriously damaged and cannot be determined, the inductance can be measured by the inductance meter or judged by the replacement method.

Precautions

1. Inductive components, the core and winding are easy to change due to the temperature rise effect. It should be noted that the body temperature must be within the specification range.

Second, the winding of the inductor easily forms an electromagnetic field after the current passes. When placing the component position, care should be taken to keep the adjacent inductors away from each other, or the winding groups are at right angles to each other to reduce the mutual inductance.

3. The windings of the layers of the inductor, especially the multi-turn thin wires, will also generate gap capacitance, which will cause high-frequency signal bypass and reduce the actual filtering effect of the inductor.

4. When testing the inductance value and Q value with the meter, in order to obtain the correct data, the test leads should be as close as possible to the component body..