【摘要】 介绍了直接频率合成 (DDS)技术的基本原理 ,详细论述了 DDS技术在变频式接地电阻测量仪电源中的应用。实验证明 ,采用 DDS技术实现的变频电源设计简单可行 ,调试、维护都很方便 ,并且得到的波形也很理想 ,谐波含量低 ,频率准确度高 ,并且能够实现频率连续可调。更多还原

【Abstract】 The basic principle of Direct Digital Synthesizer(DDS) and its application in measurer for ground resistance whose frequency can be adjusted are introduced here Experiment proves that the method is easy and available The debug and maintenance work is also convenient The wave form is qualified with low harmonious The frequency is accurate and adjustable continuously更多还原