Changing from one preset current to another can be simple as pressing a button, or switch automatically at an adjustable frequency.
从一个电流转换到另一个电流只需简单的一个按钮﹐或者在一个可以调节的频率下自动切换。
In addition a digital signal generator was incorporated via a DDS chip AD9850 from Analog Devices inc, featuring accurate frequency preset, quick phase transformation and low phase noise.
另外还采用AD公司DDS器件ad9850实现了一种频率可控制、相位变化快、相位噪声低的DDS信号源。
The method comprises the following steps: sending a detection message with a sequential identity to an RP to be detected according to a preset sending frequency;
该方法包括：根据预设的发送频率，向待检测RP发送携带有有序标识的检测报文；
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