A spectrum analyzer takes measurement one step further than the oscilloscope by measuring voltages over various frequencies. It’s rare to have a signal that is a pure sine wave (at 100 MHz for example) so this instrument will show us the spread of the harmonics on the scale of hertz.
![Spectrum Analyzer](http://www.edisontc.org/ui/files/2016/02/700-spectrumanalyzer.jpg)
Currently this page is under construction so we will recommend these other pages on Spectrum Analyzers:
How to use a spectrum analyzer
Full manual from Agilent