the basic principle of direct digital synthesizerdds 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 continuousl
本文介绍了直接数字合成器的基本原理及其在频率可调地阻测量中的应用。实验证明，该方法简单可行，调试维护方便，波形谐波低，频率准确，可连续调节
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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