一种克服分布电容的双频驱动电导率测量方法

A kind of double frequency driving method in measuring electroconductibility with conquering distributing capacitance

文章给出了一种双频测量溶液电导率的方法,该方法通过选择两个合适的频率的交流激励施加于由电阻组成的分压电路上,测量其分压电路经精密整流滤波后输出的直流电压,通过解方程组求出分压电路的时间常数τ．然后求出被测溶液电导率值,从而克服分布电容对电导值精密测量的影响．

This paper put forward a method that double frequency drive pole. This method is that .out two suited frequency on the separating voltage circuit which is compose of resistance, and then measure the DC voltage, which output from the separating voltage circuit and via commutation and filter circuit. By calculating the time constant, then calculate the electro-conductibility. SO it can conquer the influence of distributing capacitance.