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Magnetic rings have different impedance characteristics at various frequencies; generally, the impedance is low at low frequencies. As the signal frequency increases, it is well known that the higher the signal frequency, the easier it is for the signal to be radiated away. The radiation from electronic devices and the electromagnetic waves they emit can severely disrupt the proper operation of other electronic devices, leading to malfunctioning of those devices and transmission errors. At this point, when it comes to reducing the electromagnetic interference (EMI) of electronic devices, we think of magnetic core inductors, and they have not disappointed us. It offers excellent anti-interference performance, effectively suppressing the passage of high-frequency interference signals while allowing normal and useful signals to pass through smoothly. Therefore, a high-quality magnetic core inductor becomes an element that cannot be ignored when dealing with electromagnetic interference. But how can we determine whether a magnetic core inductor is of good quality? 1. The external dimensions of the magnetic ring inductor are inspected under normal lighting conditions using a vernier caliper with an accuracy of 0.02 mm. 2. The appearance of the magnetic ring inductance can be inspected visually under normal lighting conditions. 3. The inductance of the 4-turn magnetic ring inductor was measured using a \"YD2810D type LCR digital bridge\" at a frequency of 1 KHz. 4. The comprehensive factor of the magnetic ring inductance is measured using a \"CF-3A type magnetic ring sorter\", with the excitation current set at 2.5A and the frequency at 40KHz. 5. The Curie point of the magnetic ring inductance is measured using a \"YD2810D type LCR digital bridge\" and a precision oven. 6. The induced electromotive force of the magnetic ring inductance is measured under specified conditions using a \"UI100 high-frequency power supply\" and a \"UI9720 magnetic material dynamic analysis system\".