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频率电磁测深法是通过研究在大地中人工激发的交变电磁场的变化规律而达到地质勘探目的的。在大地中存在着频谱成分相当复杂的强烈的电磁干扰,其振幅可以超过有效信号的几十倍或几百倍。因此,要求仪器的供电部分具有相应频段及足够的输出功率;要求测量部分具有高选择性、高放大倍数、高稳定性、高输入阻抗等性能,并能适应于电场及磁场分量的测量。
Frequency electromagnetic sounding method is to achieve the purpose of geological exploration by studying the variation rule of artificial electromagnetic field excited in the earth. There is a very complex electromagnetic interference in the earth that has a rather complex spectrum and can have an amplitude of more than a few or a few hundred times the effective signal amplitude. Therefore, the power supply part of the instrument is required to have the corresponding frequency band and sufficient output power. The measurement part is required to have high selectivity, high magnification, high stability, high input impedance and the like, and can be adapted to the measurement of electric field and magnetic field components.