Your scope is broken - give it to me
Das könnte Dir so passen
Even with short-circuited inputs, the noise does not change.
When I connect the probe to ground nothing changes in the noise.
A connection to Probe Compensation provides this result.
I suspected that the capacitors were failing on my TDS7104.
My Tektronix TDS 684A oscilloscope that was not used for 9 years
also showed this noise. Shortly afterwards it was broken.
As it turned out, many capacitors on the TDS 684A have leaked.
If the noise on the TDS7104 is normal, I don't need to worry.