Near field magnetic probe applied to switching power supply

Near field measurements are a useful tool in the design process of a PCB board. It is a fast method to find which part of the circuit generates electromagnetic emissions and check if the solutions proposed actually works. This paper shows the construction of a Near Field Magnetic Probe, its characterization, and the explanation that how the correction factor can be obtained and measured as a function of the frequency. The Near field magnetic probe is basically a short loop antenna with a magnetic core to increase the sensibility, at the frequencies of switching power supply of a the Personal Computer. The construction of this probe is the first step for the construction of an automatized measurement system.