The MOSFET input diode is controlled by an electric field in the gate region, thus the input impedance is always extremely high because there is no forward biased diode to lower the input impedance.
Measuring earthed impedance is a all-important question in the electric equipment and system.
接地阻抗的测量是电气设备与系统中一个非常重要的问题。
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The present paper deals with the definition and algorithm of impedance real part equivalent resistivity in horizontal electric double source frequency electromagnetic sounding.