A problem with a used scope probe compensation

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OutputLogic

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I've purchased a used P6114B probe for TEK TDS-380 oscilloscope.

I cannot properly compensate it - there are significant overshoots on a square wave compensation signal.
Other probes I have work fine with that scope.

Here is a screenshot : ch1 is a bad probe compensation signal, ch2 a good one


Can anyone suggest what might be the problem?
 

Your report seems to indicate a defective probe, doesn't it?
 

I have some marginal ones that act this way, check the ground
at the 'scope input BNC (if I wiggle it there, it gets better on
one of them).

That trace looks like you have excessive DC attenuation,
which a poor ohmic connection would produce.
 

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