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根据多年来大地电磁测深法 （ＭＴ） 野外资料采集的经验， 讨论了ＭＴ观测资料的噪声源， 着重分析了工业交流电对ＭＴ观测资料的影响。提出了压制噪声的一些具体措施， 从测量装置着手， 将人为差错和测量装置本身引入的噪声减少到最低限度。对工业交流电这一主要干扰源， 视具体情况采用挪点、旋转电道和磁道的布设方向、电磁屏蔽、十字型对称布极、远参考或互参考测量方法以及在资料处理时采用压制噪声的Ｒｏｂｕｓｔ处理方法等措施来压制噪声。这些措施在一定程度上能有效提高信噪比，改善ＭＴ野外观测资料的质量， 增强ＭＴ勘探的应用效果。
According to the field data acquisition experience of MT (Magnetron Sonde) over the years, the noise source of MT observation data is discussed, and the influence of industrial AC power on MT observation data is analyzed. Some concrete measures to suppress noise are put forward. Starting with the measuring device, the human error and the noise introduced by the measuring device itself are reduced to a minimum. The main source of interference for industrial AC power is the use of discrepancies, the direction of rotation of electrical circuits and tracks, electromagnetic shielding, cross-shaped symmetric braiding, far-reference or cross-reference measurement methods, and the use of suppression noise Robust processing methods and other measures to suppress noise. To a certain extent, these measures can effectively improve the signal-to-noise ratio, improve the quality of MT field observation data and enhance the application effect of MT exploration.