Trigger Position Offset Error
It's interesting that you can use the scope to count it's own errors. But perhaps not as interesting for those actually using it to (try to) detect errors in a DUT.
Yes, not so much 'interesting' but important to know the characteristics of your equipment for use with the DUT.
I am not getting any confirmation from any user.
I will be aware of this error and to watch for this and compensate.
Like if rise times are slow ,then not to worry.
If there are many spikes on infinite persistence, then the spike 8ns before trigger could be false.
There is high probability that Rigol will not address this as it is too rare and difficult to fix for just Me
I will Note this error, like I did for the jitter and offset error we found 2 years ago
And accept Rigol's decision.
It is Not a reason to sell or return my DSO.
I accept that it is just an exercise to investigate:
"Why always 8ns offset"
"Why only on fast rise times, with fewer sample points to detect the time of the trigger"
"Why no errors at some input frequencies"
"Why # of errors increase as input changes to another frequency, than drops to No errors"
"Why no Errors at some vertical positions, yet many errors at other vertical position"
"Why after a self calibration does the vertical position that Errors occur at change a bit"
Yes I have referred all this information to Rigol 2 week ago. But I doubt they had time or intention to confirm.
Sure would nice to have someone to confirm at least one observation