一、概述:感应测井仪所输出的电压讯号与地层电导率成正比,所记录的数值表示视电导率,在解释对比中,习惯于用电阻率。同时在高阻地层中,感应仪所输出的讯号很小,各高阻之间的差别显示小,曲线平直,因此有必要在记录电导率曲线的同时,把电导率讯号转换成电阻率讯号,加以记录。由于电导率与电阻率互为倒数,因此实现这一转换的装置就称作倒数线路。用伺服电机配合倒数函数电位器可以进行倒数变换,但这种变换器,反应速度慢, First, an overview: Induction logging instrument output voltage signal is proportional to the conductivity of the formation, the recorded value indicates apparent conductivity, in contrast to explain, accustomed to the use of resistivity. At the same time in the high resistivity formation, the sensor output signal is small, the difference between the high resistance shows small, straight curve, it is necessary to record the conductivity curve at the same time, the conductivity signal is converted to a resistivity signal , To be recorded. Since conductivity and resistivity are mutually reciprocal, the device that implements this conversion is called the reciprocal line. Servo motor with the reciprocal function potentiometer can countdown conversion, but this converter, the reaction speed is slow,