As the name implies, the mixed domain oscilloscope is able to operate in more than one domain, i.e. in time to display waveforms and in frequency to display signal spectra. This type of oscilloscope is very useful for developing RF systems where fault finding in both domains is needed. It is in valuable in locating issues where waveforms may give rise to unwanted or unusual spectrum issues. As a result these scopes are finding increasing popularity for the development of cellular systems as well as Wi-Fi, and the many other wireless systems in use today.