wrote:



But with the probes set at 1x the square wave isn't quite square.
The 3 probes that have the 1x setting all act the same, with the
square wave being slightly distorted.

It didn't seem to matter if the 'scope was set to AC or DC
coupling. It also didn't matter if the signal being measured came from
the 'scope or from the function generator.



** Now that you have finally DESCRIBED the "distortion" ( a 10% overshoot) the answer is obvious.

The 465 scope is the culprit, the vertical attenuator needs frequency adjustment.

With the various probes in 10:1 setting, the trim cap allows you to compensate for the error in the scope.



..... Phil