一、前言通常,观测已调高频信号时,使用时域示波器较为方便。事实上也确实如此,在大多数情况下用它就能够进行基本的测量,但是却不能定量地测量低电平信号和调制得非常浅的信号,也不能测量信号能量的频率分布。频谱分析仪不仅可以解决这些问题,而且由于它的灵敏度高、动态范围宽并具有高分辨 I. Preface Usually, it is more convenient to use the time-domain oscilloscope when the observation has adjusted the high-frequency signal. In fact, this is true, and in most cases it can be used to make basic measurements, but it is not possible to measure low-level signals and very-modulated very-low signals quantitatively, nor to measure the frequency distribution of signal energy. Spectrum analyzers can not only solve these problems, but also because of its high sensitivity, wide dynamic range and high resolution