My first CRO was a OS-8 that's still at my mom's house in Texas

You're terrible

 

You're terrible

It was so bad only a mother could love it, on payday but I learned a lot using it. Last time I checked (when I traveled to Texas when my dad died years ago) it still worked.

 

This really is spectrum analyser territory however the modern DSO with good FFT can identify the individual signals and express them in amplitude.

Thanks for the post.That leads to a lot of interesting material.

FWIW I used OS for o scope because I heard it that way in a video.

I'm going to ask a related question in a new thread so it's easier to find in a search.

Thank you too all who posted!

 

FWIW I used OS for o scope because I heard it that way in a video.

A lot of the stuff on YouTube from so called experts is crap. Of the 115 definitions I found for OS, oscilloscope wasn't one of them. Operating System was the most common meaning and that's what I read it as even when it was used in your context, I kept thinking operating system.

 

Do some research on Fourier theory. and the FFT (Fast Fourier Transform)
An Oscilloscope displays signals in the time domain.
A spectrum analyzer, displays signals in the frequency domain.

A 2-channel scope usually has an ADD function and an Invert function. This allows one to do pseudo-differential measurements as well as adding and subtracting two signals.