(3) 频率转换时间(Frequency Switching Time) 从发出频率转换指令开始，到频率转换完毕，并进入允许的相位误差范围所需要的时间称为频率转换时间。
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描述了一种能在额定频差下测量频率转换时间的简便方法——标频调偏法。
A simple standard frequency tunable method which can be used to measure frequency switching time under the rated frequency deviation is presented.
直接数字频率合成(DDS)技术是目前广为应用的一项频率合成技术，它具有频率转换时间短、频率分辨率高、可编程等特点。
DDS (direct digital synthesis) is a sort of frequency synthesis technique, which has advantages such as short frequency conversion time, high resolution in frequencies, programmability and so on.
这种域间转换的概念在很多领域的学习中都很有用—例如，信号处理领域中从时间域移入频率域。
This notion of inter-domain transformation is useful in many fields of study-for example, moving from the time domain into the frequency domain in the field of signal processing.
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