在中、长距离电测深工作中,用电位计操作最影响读数精度的,就是表面效应加上了工业游散电流(有电气设备地区)和大地电流的混合干扰。这些干扰电流在野外一般是不能完全用极化补偿器来消除的。表面效应的消除就需要长时期的通电。在这个通电时间内,一方面由于表面效应 In the medium and long distance sounding work, the most influential reading accuracy with the potentiometer operation is the surface effect plus a mixed disturbance of industrial tour scattered current (with electrical equipment area) and the earth current. These disturbing currents in the field are generally not completely eliminated with polarization compensators. The elimination of surface effects requires a long period of energization. In this power-on time, on the one hand due to the surface effect