I am assuming you did a self cal at 2.06 and again with 2.05 Sp2.
I was thinking of upgrading myself, but now, I might just wait a bit.
Yup - I am a coward.
Can I ask some questions?
Did the self cal with 2.06 change anything at all?
Is the noise only at low voltage input, or is it on high voltage ranges as well?
Does the noise look different with both channels on?
If you force the scope to sample at a lower speed by, say, changing to 10mS per div with extended memory off , is the noise the same but at a lower frequency?
One of the things I am wondering is if the A/D calibration offsets for the A/D's wanders away from zero to the point where it is no longer possible to correct, or even worse, roll over changing the sign of the correction. This could happen if they use a very crude algorithm in the A/D offset autocal routine and it gets easily confused. If it was something like this, then somehow resetting the A/D offset cal nos and then doing a new auto cal could solve the problem.
Richard
Here is what I am wondering.
One of the main tasks of the self cal is to balance the readings of the 8 A/D's