Usually, linear scale is used for frequency on the x-axis, and a logarithmic or decibel scale (also logarithmic), for amplitude on the y-axis, so that signals of widely varying amplitude can be seen at the same time. The maximum frequency range with preselection currently available is from 2 hertz to 85 GHz higher frequencies are possible with external mixers. An RF spectrum analyzer covers radio and microwave frequencies. The basic function is to represent the signals in a graphical display as amplitude-or power level-on the y-axis, against frequency on the x-axis the amplitudes of detected signals are represented in the frequency domain. A spectrum analyzer does what the name suggests: it detects the signals present in a selected range of spectrum.
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