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How to judge the quality of the inductor?
May 23, 2018

How to judge the quality of the inductor?

With the rapid development of technology, inductors have been integrated into every corner of our lives. And the variety of inductors, the role is different. So how do we judge the quality of an inductor? The following gain inductors briefly introduce three commonly used detection and judgment methods:

inductors with a core or metal shield.png

1, visual inspection

Directly observe whether the pins of the inductor are disconnected, whether the core is loose, whether the insulation is broken or burnt.


2, multimeter detection

We can use the multimeter resistance file to measure the on and off of the inductor and the resistance value to judge whether the inductor is good or bad. Place the multimeter in the Ω file. The red and black test leads are connected to any of the terminals of the inductor. At this time, the pointer should swing to the right. According to the measured resistance value, the following three conditions can be determined.


(1) The measured inductor resistance is too small. It indicates that the internal coil of the inductor has a short-circuit fault. When paying attention to the test operation, you must first zero the multimeter carefully and carefully observe whether the position of the pointer swinging to the right actually reaches the zero position, so as to avoid misjudgment. When it is suspected that there is a short-circuit fault inside the inductor, it is best to repeat the test several times with R × 1 Ω to make a correct judgment.

(2) The inductor under test has a resistance value. The magnitude of the DC resistance of the inductor is directly related to the wire diameter and number of windings used to wind the inductor coil. The thinner the wire diameter, the larger the number of turns, the larger the resistance value. Under normal circumstances, use the multimeter R × 1 Ω block measurement, as long as the resistance value can be measured, it can be considered that the inductor under test is normal.

(3) The resistance value of the inductor under test is infinite. This phenomenon is easier to distinguish, indicating that a broken circuit has occurred at the coil or the lead end of the inductor and the coil contact.


3. Insulation detection

Insulation detection is primarily for inductors with a core or metal shield. Place the multimeter in the R*1K file and measure the resistance between the coil lead and the iron core or metal shield. Under normal conditions, it is infinite (the needle does not move), otherwise the inductor is poorly insulated.

Note: When measuring a coil with a small inductance, it is good to electrically block the conduction of both ends of the measuring coil.

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