Tek 475 trace/probe problem

[amdx]

Ask on the Yahoo Tekscopes group:

http://tech.groups.yahoo.com/group/TekScopes/

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

 

[[email protected]]

OK. the $32 question. If you just short the input with no probe attached do you get this interference ?

 

[amdx]

OK. the $32 question. If you just short the input with no probe attached do you get this interference ?

No!

Mikek

 

[Artemus]

Hi Guys,
I recently acquired a Tektronix 475 scope.
While testing it with the internal squarewave calibrator
I noted the trace was wide, I tried the second probe, same thing.
Then I happened set the probe cable across the top of the scope,
when I did that the trace got thin or more normal.
I tried a third probe it is better but the trace width varies somewhat depending where the probe
is positioned, any ideas?

Mikek

What was the problem and solution?
Art