摘要：由于电源线EMI信号具有幅度大、频谱宽的特点，而且其中夹杂大量的暂态过电压和浪涌大电流，这些因素使电源线传导干扰的抑制较难控制。这就使了解磁性材料磁谱分析的影响，以便设计合理的EMI滤波器变得尤为重要。文章首先研究了磁性材料低频磁谱的测试原理与方法；在此基础上对磁性材料低频磁谱进行测试；最后根据测试结果给出最佳设计方案。
关键词：EMI磁谱分析；磁芯磁谱

Abstract:As the power line EMI signals amplitude，the characteristics of wide spectrum，but it mixes a lot of transient over voltage and surge-current，these factors make the power line conducted interference suppression more difficult to control.This makes understanding the impact of magnetic materials for magnetic spectrum of the EMI filter designed to become more important.This paper studies the magnetic spectrum of low-frequency magnetic measuring principle and method；On the basis of low-frequency magnetic spectrum on the magnetic material testing；final test results are given according to the best design.
Key Words:EMI spectral analysis of magnetic；Core magnetic spectrum