Thank you tatel.
Yes, I am aware that the DSO2512 has a signal generator up to 10MHz sine, but that is not the frequency range we are interested in.
The Si5351 produces square waves up to 160 MHz and I think it is not too bad for testing the bandwidth.
Of course, it's not a real function generator.
So far we don't even known for sure your Si5351 module output impedance, amplitude, etc. We don't know if it goes flat up to 160 MHz (which I somewhat doubt). Not really useful then. Perhaps you could ask the seller?
I don't think DSO2512 needs to be tested up to advertised specs. Should it be proven aliasing-free, reasonably accurate, with a stable trace up to 20 MHz, I could recommend it to a newbie on a short budget. I for one wouldn't care how it behaves above 20 MHz if it works good up to that. I wouldn't call it a "toy" in that case, even if it just takes 40 V on its inputs, 10 mV/div max and memory deep just 128 K. It does *almost* all a 20-30 MHz Hameg could do, plust it has 14 measurements, while these Hamegs don't have even one unless you do the math. Let alone any FFT.
Even HDS242/272 doesn't have RMS measurement nor FFT. Also, DSO2512 doesn't seem to have quite a bit of temperature drift, which is something HDS242/272 does have. Zeeweii seems to be more responsive to users than Owon. Plus it is brand new, small, portable, works on batteries...
That said, 4thDoctorWhoFan already tested it, so for me, it's (almost) done.
Yet I would like to see a video of that or a similar test, just because my DSO154, which is also from Zeeweii, when dealing with a square wave whose harmonics exceed device's bandwidth, shows the infamous amphetaminic trace. So I would like to see how a 5-12Vpp square wave behaves on DSO2512, before recommending it. Screenshots show it much more stable than it really is.
HM303-3, which I paid a hundred bucks for (delivered), is now in the same price range than DSO2512, but doesn't have any amphetamine addiction. So it would be "better" even if it's advertised as a 30 MHz oscilloscope. That said, I'm been hunting it for more than two months, it's 1995 vintage, heavy, takes a lot of benchtop space, came without any probes, doesn't give any measurements automatically and, worse of all, I'm afraid it needs to be adjusted ASAP. Which requires at least a multimeter, a known-good function generator, and perhaps another oscilloscope. That's not in most newbies' reach.
So I'm still not really sure what I could recommend to that hypotetycal guy on a budget. Surely a "60 MHz" oscilloscope shouldn't show any amphetamine addiction if a 30 MHz one doesn't either.
That's why I would like to see that video showing a 20 MHz sweep on DSO2512. Square... and sine, please.
BTW, a rise time measurement done with a fast enough pulser would be helpful, too. Too bad the guys who have a 200 MHz function generator an fast pulsers don't care about this new-entry-level osciloscopes.