just to be clear, if you want this FFT buzz, just buy a proper Spectrum Analyzer, those 1Mpts DSPed scope will become obsolete quick.
No. Because a spectrum analyser doesn't go to near DC frequencies. Also the frequency resolution of 1Mpts FFT will beat a spectrum analyser hands down at low frequencies.
whats the point if it can have leakage in 500Hz bin? anyway, 1Mpts FFT is not something unsolvable in 1kZ+PC. whats no working solution so far (afaik) is 10Mpts FFT Siglent DSO (even +PC). ps: those who are not aware the deeper details of FFT yet, we cant just use all 17Mpts and expect to get 8.5Mpts FFT, it will take ages to compute O(N^2) of simple "any size" FFT algorithm, we'll need O(N.log(N)) such as DIT or KISS FFT, but that need only of size N=2^y (y must be integer) so your 17Mpts must be downgraded to maybe like 10Mpts data in time domain, hence you'll only get 5Mpts FFT. with 24Mpts data, it will downgraded to 20Mpts, hence we can have 10Mpts FFT (50Hz bin instead of 100Hz bin in 5Mpts FFT). fwiw.
And if you just paste plots from LTSpice, you don't need scope at all...
Stop trolling about what analysis you can do on PC in a topic about oscilloscopes.
Did you know Rigol DS1054Z can also
fly?
You just have to put on an airplane...
Let see if other manufacturer's scopes can do that!!
As Nico nicely says, there is a point of diminishing returns for everything.
FFT on scope needs lot of points if you want high frequency resolution AND high maximum frequency at the same time. If you're looking at the frequencies of up to, let's say 100kHz, 64kpoints is a lots of resolution: at 200 KSPS/s, with 64kpoints you get 32kbins, that gives you resolution of 3 Hz per bin.
Problem is with higher frequencies: with 16 MHz bandwidth (32MSps/s) same 64k points will get 476,8 Khz per bin. So if you want better RBW to look at 10.7 MHz filter, you need to bump u FFT points to more: 2 MPoints will give 1 Mbins, and you get 14.9 Hz per bin.. 1 MPoints will give 512 kbins, and you get 30 Hz per bin..
Point is, SA shines with MHz frequencies and up, because of constant RBW, because it uses downconversion.
At lower frequencies, FFT will get better results and will have instantaneous full real time bandwidth for whole measured frequency interval.
At audio frequencies, even 128k Points will achieve impressive resolution, more than enough to tune and verify any audio filter made with real life components.
1MPoint extends that to little bit higher frequencies, so it is quite useful to some 10s of MHz.
For serious work in MHZ and up region, you need SA, like Mechatrommer says. 8 bit scopes might have RBW good enough to look at the things, but they won't have dynamic range of a SA.
For low frequencies, you need high res scope or audio or some kind of specialized analyser...