thanks for the info.
i bought me a HMO2024 lately. of course its WAY OVERKILL for what i use it. but hey. once in a lifetime... u know.
till now im pretty satisfied with it. but im ALL NEW to DSO/MSOs. I once learned 20yrs ago on analog scopes.
the signals shown when moving the scope around i dont think i had yet.
BUT i dont know exactly what setup you used to reproduce your signal or if your probes are shorted out or what the thing is.
What i detected yet on my bench is that im living in a PRETTY NOISY environment. If i go down on mV Ranges with open probes or (even worse) when used with BNC to banana adapter i catch PLENTY OF LOW FREQ + HIGH FREQ noises.
I figured that my CFT Lamp at the Desk fires a lot of LF/RF. Also a close PowerLine Adapter no more than 2m in distance injects A LOT of heavy RF noise around 30Mhz.
So it seems the inputs are pretty HIGH impedance and will catch up lots of crap when not properly connected to a circuit and when used without well shielded probes.
Daves experiment with the shorted probes "slammed" to the table i did test. However it did not perform as well. So either i didnt slammed my expensive probes hard enough to my desk or they are less sensitive to mechanical shock than his probes.
If you can re-describe your setup more precisely, what probes, how connected, shorted or not ect ect i would do the test too on my setup and can report.
BTW: as far as i see your scope on the HAMEG website it looks more like a regular "old school" scope housing. my HMO is "tiny" compared to an ol'time Scope. Just about 10cm deep/depth. And even less wide than a regular 1990s Scope. So i guess there is also some major differences in the scope design which "could" make yours more sensible to shocks or vibrations than my HMO. but as i said, willing to re-test when you can explain me the exact setup.
best wishes
Axel