Since you have 2 (or more) scopes, use the second one to look at the cal out on the noisy scope. This will rule out, or point to, a noisy cal generator. Be sure to get your grounds connected. I still think bad connector grounds are more likely on the noisy scope. Art
I've got the question on that group but so far more response here than there. I do have input from there and have eliminated a few things.
Mikek
OK. the $32 question. If you just short the input with no probe attached do you get this interference ?
No!
Mikek
What was the problem and solution? Art
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