eaglepcb-design
When I run a DRU check I see that the via size changes on the board. I would like to know what part of DRU settings relates to this. Here is the animated gif showing this problem.
BEFORE:
AFTER:
You can see the vias get a bit larger. It is more obvious in this GIF ANIMATION OF THE ISSUE
Create a footprint with GND and AGND pads. Draw copper between these pads. Yes, this will produce a DRC "Overlap" error as shown below:
This is OK. There three buttons at the bottom:
"Clear all" will temporarily clear the list for this run of the DRC. I'm not sure why that's useful; just close the window if you want it shortened.
"Processed" will fade out the color of the red X. This is potentially useful if you're iterating through a long list of DRC errors and fixing them as you go; you can keep track of the ones you think you've corrected.
"Approve" is the only one I use on a regular basis. This moves the error from the errors list to the approved list:
and keeps it there on subsequent runs of the DRC. Note that this only moves this specific error with this specific pair of nets at this specific location. Closing this window and running the DRC again produces the notification "DRC: 1 approved errors"
and no "DRC Errors" dialog. You can get this dialog back by creating an error, or (preferably) the errors command, the yellow exclamation point in the above screenshot, or the menu Tools -> Errors.
The "Approve" functionality exists for a reason, the same reason that we have tools like
#pragma GCC diagnostic ignored "-Warning"
Sometimes, it's OK to ignore a DRC error. This is one of those times.
You are letting the DRC settings override the diameter. Use the "as defined in library" (or something like that, can't remember the exact name) setting. That's what it's for.
Best Answer
The default rules message that pops up in the animated GIF should be a big clue as to what is going on here.
It would appear that the default values for via settings are being applied over what you have placed in the design. You should follow the advice of that warning dialog and set the defaults as appropriate to your design and save it under a project specific set of defaults.