Wonder why folks put so much emphasis on the pulse method to determine scope BW since the scope low pass filter charactistics are usually not known
I did this for years with the Bodnarpulser, for a trivial reason:
I didn't have a source that could "go" that high to capture the bandwidths of my scopes.
Maybe I wasn't the only one...
Now I have an R&S generator with which I can determine it as long as the scope is well below 1Ghz (R&S SML01).
And even then you can't display such a frequency response for all scopes, with the siglents it works with the FFT peak function.
Nevertheless, I still use the Pulser for the risetime determination, it is simply faster.
For "more precise" then the method mentioned above with a sweep.
All one needs is a decent sinewave signal generator to measure scope BW, not necessarily accurate in amplitude just uniform across the frequency range of interest. It takes just two measurements, one at a lower frequency and then another when amplitude drops 3dB. In a well behaved scope this takes into account the usual "unknown" scope filter response, whereas the pulse technique does not.
Not going to discount the pulse use tho, as a scope is a Time Domain instrument and usually used to measure pulses more, just as a SA is a Frequency Domain instrument and usually not utilized to measure Time Domain parameters, altho believe some do TDR by inference.
All this begs the question, since SAs are specified over the frequency range of use (does anyone even know the pulse response of their SA?), why not specify scopes with pulse response rather than BW??
So instead of a 350MHz scope one would have a 1ns Scope, or whatever based upon filter characteristics
Anyway, thought this was interesting, of course YMMV!!
BTW seems the latest scopes are starting to move into the Frequency Domain more, things like high resolution and frequency range FFTs, Bode Plots and so on, very versatile instruments indeed
Wait, we have one of these scopes, well it's pretty good but not the latest 12 bitter, we
need,
must have,
require,
demand,
requisition, ok we'll now start saving our lunch/beer money for one
Best,