I suppose we could all go back to 500 volt electrical test.  
          Dished down circuits would probably burn out if we did 
          that......
          
          Dave Sullivan
          Rockwell Collins, Inc.
          
          NOTE:     I'm quite sure my company would disavow any 
          knowledge of my existence if they thought I was serious 
          about the last statement.


______________________________ Reply Separator _________________________________
Subject: Re:Re: FAB-Dish downs in copper circuits
Author:  [log in to unmask] at ccmgw1
Date:    1/28/97 9:29 AM


     Mike Covell's explanation of the dish-down in the circuit trace (hole 
     in the resist laminator roll due to attack by sulfuric acid) is en- 
     lightening.  It makes me wonder how many more boards produced on that 
     laminator are at risk, and how many other rollers also have holes.  
     This seems like a problem that would be very easy to miss.  A dish- 
     down would surely be much more difficult for a person or a vision 
     system to detect than a mouse-bite.
          
     Gordon Davy
          
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