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PCB Layout Terminology

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bvigg

Electrical
Joined
Aug 2, 2004
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3
Location
US
Can someone explain what "master pattern" and/or "plan view" means in the requirement below which I have been given from a customer?

"For each developed printed circuit board the Contractor shall provide a master pattern and plan view of the parts layout".
 
Master pattern is a drawing showing the circuit traces, pads, holes for each layer of copper of each board. In the bad old days, circuit boards would be photo-etched directly from a master pattern of the traces made on mylar film.

Plan view is the view of the assembled/populated circuit board, as if you were looking straight down on it. Terminology comes from the building/civil types, where an elevation view shows the house as if you were to take a picture of it standing nearby, plan view is as if hovering above it in a balloon.
 
In today's parlance, they want your Gerber files (master pattern) and component placement diagram (plan view).

Dan - Owner
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