I'm looking to buy my first oscilloscope, no experience, hence need a bit advice on typical lower-budget scopes.
A particular purpose is to look at rise time of rectangular waves with rise time from ~5ns, of frequencies typically 10-100Hz, and up. And harmonics, for whatever features it may have for that.
I figure just from the rise time that would require a 100MHz scope. But I'm not sure of how the other specs matter.
Considering some typical specs;
A 100MHz 500MSa/s 32k B 100MHz 1GSa/s 40kpts C 100MHz 1GSa/s 2Mpts D 150MHz 1GSa/s 2Mpts E 200MHz 500MSa/s 32k F 200MHz 2GSa/s/CH 18kpts/CH
So, am I reading this correctly by assuming the (F) has 4 times the sample rate of the (D) when using both channels? If so that is perhaps of major importance? I don't really understand why there often is, like above, such a large differences in memory depth.. What limitations and importance does that really make?
So, any advice on these typical spec variations would be very welcome.