在我们的工区中,各地震队经常遇到由高压电网产生的交流感应,严重影响原始记录质量。为了克服高压线产生的电感应,各队在党支部的领导下,发动群众,不断实践,曾先后采用在检波器上扣金属盒,挖土沟埋大小线等五十多种办法,最后终于试验成功用屏蔽网和双 T 陷波器联合使用的办法,可以将高压电感应在记录上的幅度由最大20毫米降低到1.5毫米以下,基本上消除了50周感应对原始记录的影响。图1是我们采用的双 T 陷波器的线路图。这种线路可以装在701型或663型放大器 In our work area, the seismic teams often encounter the AC induced by the high-voltage power grid, seriously affecting the quality of the original recording. In order to overcome the induction caused by the high voltage line, under the leadership of the party branches, all the teams mobilized the masses and kept practicing. They successively used more than 50 methods such as buckling the metal box on the detector and digging the large and small digging ditches, and finally they finally experimented The successful use of shielded mesh and dual T-notch filters combined with the ability to reduce the amplitude of high-voltage induction from a maximum of 20 mm to less than 1.5 mm substantially eliminated the effect of a 50-week induction on the original recording. Figure 1 is a circuit diagram of the dual T-notch we used. This line can be installed in 701 or 663 amplifier