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地电方法测量的物理量实际上是一个直流电压(供电电流也是通过标准电阻转换成电压的)、为了提高观测精度,实现地电测量的自动化,67年原兰州地球物理所邢台队试用过直流数字电压表;72年以后兰州地震大队和宁夏地震队先后使用过PZ5型、PZ8型、PZ13型等直流数字电压表,这些仪器在地电测量中往往因为抑制不住外来的干扰而使仪器的精度大大降低甚至不能正常工作。73年昆明地震大队、74年兰州地震大队先后都试制成数字式的地电仪。
The physical quantity measured by the geoelectric method is actually a DC voltage (the supply current is also converted into a voltage through a standard resistor). In order to improve the observation accuracy and realize the geoelectric measurement automation, the original Lanzhou Institute of Geophysics, Xingtai, 67 years tried the DC digital Voltmeter; after 72 years, Lanzhou earthquake brigade and Ningxia earthquake team have used PZ5 type, PZ8 type, PZ13 type DC digital voltmeter, these instruments often in the geoelectric measurement can not suppress the external interference and the accuracy of the instrument Greatly reduced or even not working properly. 73 Kunming earthquake brigade, 74 Lanzhou earthquake brigade has tried to make a digital geoelectric instrument.