Here images including explanations.
This is normal Owon SDS7102V
There is test images where oscilloscope input BNC have clean signal.
There is also some test images made
using normally (I mean this "easywork" practice) Owon Probe with long GND wire.
(you can see also ringing what is made by "wrong use" of Probe. In professional world
if someone do this, it is exatly working error. (There is fast rising edge and people with total lack of any knowledge or experience use long GND wire and then think what is problem in my signal under test. This is of course now here intentional mistake. (and what ever signal use this GND wire in its pathway it need understand that it is reactive component. It IS inductor. 200MHz and its reactance is around 200ohm or even more. So, good bye tight GND.
![Wink ;)](https://www.eevblog.com/forum/Smileys/default/xwink.gif.pagespeed.ic.cldandycH0.png)
Oh well, some tell me that it is not very practical to use short GND. Yes I know, wrong measurements are more "easywork" to do than good measurements. We do many times lot of work for this... add probe adapters to PCB, solder short wires to PCB etc... just for some seconds looking oscilloscope display.
Here is not other kind of noise tests playing around with "probes".
But these images tell what is around normal noise levels when there is quite clean signal in oscilloscope input BNC. What happend outside of oscilloscope, it depends so extremely lot of how people is working and what kind of skills end experiences he havé for do good quality measurements. These things are too much related to user. They depend how user use his tools and what he is doing.
This one image have Agilent 100MHz oscilloscope for compare. Also copmpare is not so equal becouse in Agilent there was normal mode and lower samplerate, if do really compatible tests... Owon win more.
Agilent example inside 2nd picture is from discussion:
http://www.home.agilent.com/owc_discussions/thread.jspa?threadID=17549&tstart=105&start=45It is copied from picture where is settings so that they can sure be very comparable with these owon settings here.
I do not take a position on what kind of results can be obtained with different measurement methods outside of the Owon oscilloscope. It depends so much about user. Here in EEVblog forum is mine and the others many various test results with different measurement ways. All it takes is a little effort to look for them and read them.
Here normal Owon SDS7102V what I have today in my stock (new units from factory, arrived March 2013. )
I do not know what manufacture lot, what serial numbers may have or perhaps not this bad level "noisy GND" issue. My headache is whjat I sell. I'm responsible to my customers and only for them. If I now tell that this and that lot scopes I have... then someone think.. ok this is good.. then he buy from someone and big disappoint.. and finger show me.. you lie. So, I do not give information what may lead false conclusions. (end)