Purpose |
Reports measurements of via pad gaskets that are narrower than the pp_ar action parameter. |
Function |
Reports measurements of via pad gaskets that are narrower
than the pp_ar action parameter. |
Activation |
|
This category reports on measurements of gasket annular
rings. Gaskets are overlapping sections of solder mask on board features, such
as pads, which makes the solder mask opening smaller than the pad.
The system measures this by assuming a negative annular ring,
i.e. an annular ring that dips into the pad rather than extends beyond it. To
indicate to the system that you wish to activate the "gasket" categories (i.e.
consider negative annular rings), set the ERF variable categorize_negative_ar to 1 (active).
When categorize_negative_ar
is set to 0 (inactive), the
system assigns a zero value globally to all negative annular rings.
The following figure clarifies the definition of a gasket: