Running DRC Creates 'Ghost' traces.

On 29/10/14 19:11, G.T. Grey wrote:

Every time I run DRC I get stray Traces and hundreds of errors.  The

ghost traces are on  different layers and cause  Width,

clearance,distance, etc errors.

I suspect you're misinterpreting what you're seeing. Those so-called

traces look to me like DRC error markers. Try clearing all the DRC

errors in the dialog box.

You may be right.  I thought each error was simply highlighted with a square box as it was selected in the dialog box.  But it that's the case,  Why doesn't it disappear when a correction is made and the DRC is re-run??  Why do these 'ghost' traces remain on the board layout after the DRC dialog is closed ?? And.. if cleared in the dialog box, they never show up again unless the .pro file is deleted and the board is reloaded.   

I'm relatively new to Eagle and may not understand many of the settings but at this point it appears the DRC can be more of a hindrance than a help.

On 30/10/14 15:26, G.T. Grey wrote:

You may be right.  I thought each error was simply highlighted with a

square box as it was selected in the dialog box.

No, that's only to draw your attention to it. The real "indication of

the problem" is drawn hatched in the appropriate colour for the layer

it's been found on. This allows the DRC to show exactly how big a

problem you've got with clearance errors, because it only hatches the

overlap of the required clearances.

But it that's the

case,  Why doesn't it disappear when a correction is made and the DRC is

re-run??

Simply adjusting the position of your tracks doesn't clear the DRC

error. You have to explicitly tell Eagle that you (think you) have fixed

it, by clicking the "Processed" button on the DRC dialogue. (Older

versions of Eagle had a "delete" button instead, which was more obvious

in what it did).

Why do these 'ghost' traces remain on the board layout after

the DRC dialog is closed ??

Because the errors are still there, unless you've cleared them.

And.. if cleared in the dialog box, they

never show up again unless the .pro file is deleted and the board is

reloaded.   

How are you clearing them? Since Eagle 5 it's been possible to "Approve"

errors. This was added because sometimes you need to do things that are

actually fine but always create DRC errors (search for threads on

connecting two nets together to see an example). What approve does is to

mark that error as one you know about, are sure is actually fine, and

have no intention of fixing, so just quit bugging me about it, OK? Don't

do this if you've actually fixed it.

 

I'm relatively new to Eagle and may not understand many of the settings

but at this point it appears the DRC can be more of a hindrance than a

help.

 

No, it's definitely more of a help, once you've got the hang of it.