Abstract
This paper describes a DC electric field measurement circuit which enables power saving in a field mill. An electric field measurement circuit of a conventional field mill detects an electric charge on induction electrodes generated by an applied electric field as a current. This current flows instantly and ends, so the rotary shutter must rotate at high speed. Therefore, the conventional field mill consumes a large amount of power. The authors introduce a method to reduce the power consumption by detecting an electric potential of the induction electrodes with a high impedance input circuit for a long time. One of the problems in realizing this method must be a reduction of leakage current in printed circuit boards and various devices. In this study, the leakage current experimentally was verified using test models based on this method. And the experimentally results were also evaluated by steady current analyses using the finite element method.
