The spectrum analyzer can display the spectrum, amplitude and frequency of the measured signal. Its main function is to perform spectrum analysis, test and divide the frequency and power of the signal
Analyze and display the analysis results in analog or digital mode. Modern spectrum analyzer can analyze all radio frequency bands from VLF to submillimeter band below 1 Hz.

The spectrometer can measure the amplitude and frequency changes of input signals in the whole frequency range. Its main purpose is to measure the spectral power of known and unknown signals.
The frequency shows the spectrum characteristics of the input signal, which is an oscilloscope in the frequency domain.