Power frequency electric field detection has very important application prospect in the fields of fault detection of transmission lines and body protection in strong electromagnetic field. Aiming at the features of the output signal from the micro-machined electric-field sensitive structure

a preamplifier circuit is designed to amplifying the weak output signal. Based on phase sensitive detection principle

an analog demodulation circuit is designed. It achieves faster response rate

signal processing is realized based on ARM microcontroller

a novel handheld measurement system of power frequency electric field is developed. The detection performance under transmission lines shows that the system has good detection performance

the detection results have good consistency with the electric field measuring instrument of Germany Narda.