hollow inductor coil play an important role in electronic equipment. As more and more manufacturers with uneven quality join the market, high-quality inductors have become more and more difficult to find. Let me tell you how to judge the quality of inductors. Good or bad.
The stability of an inductance coil generally indicates the degree to which the parameters of the inductance coil change with changes in environmental conditions. Generally, the stability of the inductance coil can be evaluated by the inductance temperature coefficient αL. Generally, it represents the stability of the inductance relative to the tear level.
In this way, the inductor coil can be shrunk after being cooled and tightly attached to the frame, which is no longer prone to deformation after heating, and accordingly improves stability. In addition to temperature, temperature will also cause changes in the parameters of the inductor coil, such as increased humidity When it is large, the distributed capacitance and loss of the inductance coil will increase, thereby reducing the stability of the inductance coil.
In the use of the inductor, if there is no special measuring instrument, you can use a multimeter to make a simple quality judgment. You can use a multimeter to electrically measure the DC resistance of the inductor, and then compare it with the original or nominal resistance.
If the measured resistance value is infinite, it can be judged that the inductor coil is broken. If the measured resistance value is much smaller, then it can be judged that the inductor coil has a short circuit. Both of them can be judged that the inductor coil has a quality problem. , Can no longer be used, if the detected resistance is not significantly different from the original determination or the nominal resistance, it can be considered that the quality of the inductance coil is basically good.