分析了锁相环的基本原理和实现，并对射频电路设计理论和阻抗匹配问题进行了探究。
Analyzing the basic theory and development of PLL, and studying the design theory and impedance match problem of experimental circuit board.
简要介绍了涡流检测的基本原理和涡流探头的特性； 分析和研究了涡流检测探头提离变化对阻抗的影响；
The basic principle of eddy current testing is introduced and the coil impedance responses due to the variations of the probe coil lift-off are analyzed and studied.
通过简单且直观的方法介绍了特性阻抗的基本性质、计算和测量方法。
This paper introduces the basic property, calculation and measurement of property impedance in simple and directly perceived ways.
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