Are you by any chance using LED or florescent lighting and is the scope
being operated out of the case when this is occuring?
On Thu, Feb 25, 2021, 3:39 PM Michael Perkins via groups.io <holdoff08=
The scope's vertical amplifier is completely differential after the input
phase splitter, so it sounds like the ripple must be injected before the
phase splitter. The phase splitter is a matched jet if I remember
correctly, so I think it must be a source before the gets. The fetus input
impedance is very high, so a stray field could be the culprit. Making sure
the grounding is consistent might lead you to the solution. Mike
On Thu, Feb 25, 2021 at 6:56 AM, Stephen<email@example.com>
wrote: Thanks Raymond,
I can’t dish out that kind of money for a UPS at the moment.
Thanks for the tip and explanations anyway.