感应直流电压信号转变为一定频率的交变信号，采用放大、滤波等电子技术，实现直流电场强度的测量.表明了工程技术中的

实际问题往往是依据最基本的物理学概念和规律解决的.通过测量原理的分析，培养学生理论联系实际的能力，通过实验装置

的设计和实验，提高学生的动手实践能力和分析解决实际问题的能力.教学科研相结合，培养学生的科研意识和创新能力，提

高学生的综合素质.本文方法可以用于工程实际.

electric field，a set of experimenting equipment is made based on electrostatic induction theory and varying capacitance

method. Induction DC voltage signal is translated into a certain frequency AC signal. The DC electric-field

strength is measured by electrical technology of amplifying and filtering. The fact that many practical engineering

technology problems are often solved by base physics concepts and laws is demonstrated. The student abilities of integration

of theory with practice are brought up by analyzing the testing theories. The practice abilities and abilities

of analyzing and solving practical problems are improved by designing experimental equipment and experimental research.

The combination of teaching scientific research can satisfy the colligation diathesis of students and students’

consciousness of scientific-research and innovation abilities are improved. This method can be used in practical engineering.