Jon,
my greater concern would be to look at your gerber data and speak
with your fabricator to determine what went wrong where? My first suspicion
would be to look at your gerber data format and check that you have suitable
resolution specified, i.e. at 'least' 2.4 format. Secondly talk with your
fabricator to determine if they did anything to the gerber. I am sure that
Abd ul-Rahman will swear by the process because he essentially defined it
and uses it by his own words.
Brad Velander,
Lead PCB Designer,
Norsat International Inc.,
#300 - 4401 Still Creek Dr.,
Burnaby, B.C., V5C 6G9.
Tel. (604) 292-9089 direct
Fax (604) 292-9010
website www.norsat.com
> -----Original Message-----
> From: Jon Elson [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, June 27, 2001 1:08 PM
> To: Protel EDA Forum
> Subject: Re: [PEDA] How do I modify the design rules to allow
> a shorted
> li nk to gnd?
>
>
>
>
> Brad Velander wrote:
>
> > Tim,
> > the simple answer to your problem should be the use
> of the Short
> > Circuit Constraint rule under the "Other" tab in the design
> rules. However,
> > the last time any of us tried it (SP5 I believe) it didn't work.
> > So the only other option open is to use the virtual
> shorting jumper
> > a described by Abd ul-Rahman many times. You can find the
> description of
> > this methodology in the FAQ sheet in one of the Yahoo
> Protel groups sites. I
> > don't actually use this process so I would probably hack it
> to death if I
> > tried to describe it to you.
>
> I tried this on a recent board, and had mixed results. I had a row of
> 12 3-pin jumpers, and 4 of the 12 were successfully shorted, the other
> 8 had a visible gap in the copper, about .004", I'd guess.
> It seems there
> may have been roundoff either in Protel or at the
> photoplotter that caused
> some of these .00005" gaps to become much larger. I'm going
> to have to
> come up with a better scheme for this that ensures the
> jumpers are truly
> shorted.
>
> Jon
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