EAGLE Help

Annulus


Annulus symbols isolate through-holes in supply layers.

Their dimensions are calculated in the following way, based on the parameters "Isolate" and "Conduct" along with the drill diameter:

Inner diameter = D + 2 * C
Outer diameter = max(D, Inner dia.) + 2 * I
which: D = drill diameter
       C = Conduct (Default: -1000, completely filled)
       I = Isolate (Default:  20 [Mil])
With the default settings annulus symbols with an isolation ring of 20 Mils width are generated.
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