It can be classified into two methods of measurements: the time domainmeasurement and the frequencydomainmeasurement.
某些毫秒级以上的频率变化，只有时域测量才能实现。
2
Modulation domain analysis has become an important part for modern measurement technology. It is better than time domain and frequencydomainmeasurement when indicating frequency variable signal.
调制域分析已经成为现代测试技术不可或缺的部分，在显现频率变化信号时优于时域测量和频域测量。
3
The selection of measurement bandwidth in time domainfrequency stability is discussed.