You can more detail about  Fiducials on following SMEMA Standard on Fiducial.

http://www.ipc.org/html/smema3.1.pdf

Hope this will help you

 

Narinder Kumar C.I.D

Ajax, Ontario, Camada

>From: [EMAIL PROTECTED]
>Reply-To: "Protel EDA Forum" <[EMAIL PROTECTED]>
>To: "Protel EDA Forum" <[EMAIL PROTECTED]>
>Subject: Re: [PEDA] Fiducials
>Date: Mon, 14 Oct 2002 13:47:27 -0400
>
> > From: Matt Daggett [mailto:[EMAIL PROTECTED]]
> >...
> > "remember to add fiducials to your design. All high
> > precision placement machines must have visual
> > targets as part of the design."
> >
> > Can someone give a brief explanation of what these are and
> > what I need to do in Protel to satisfy their requirements.
>
>Matt,
>
>This topic has been covered at length. Breifly, a fiducial is an optical
>alignment mark, or as indicated above, a target. Check the archive for more
>detailed explanations.
>
>aj
>
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