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The KC R20 near-field probe group consists of 3 passive magnetic field probes with sizes ranging from large to small. The probe has a relatively flat frequency response from 30MHz to 3GHz, which is used to measure magnetic field in the research and development stage. And an electric probe. Magnetic field probe at low frequencies, also has the sensitivity detection of three probe diameter of 20 mm respectively, 10 mm, 5 mm, with large diameter and high probe sensitivity of low resolution, but the direction that corresponds to the small diameter of the probe sensitivity is low, but the direction of high resolution. When used, the large size probe is usually used to confirm the approximate area of the interferon source, and then the small diameter probe is switched to narrow the search scope, and the interference magnetic source in the electronic module is gradually identified.