Purpose |
A non-plated through hole should, by definition, be kept apart from copper surfaces since it is used for mounting and tooling by metal objects. |
Function |
Reports NPTHs which are too close to copper, or touching copper when not supposed to, if distance is less than action parameter pp_d2c . By setting the ERF variable take_npth_range to 1 (one), instead of using the parameter pp_d2c for the NPTH to Copper spacing, we will use the third number (green level) of the range of npth2c as specified in the ERF file. This allows us to run checks for larger spacing around NPTH holes. |
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If too close in negative P&G layers, it means that the NPTH is
not contained in a large enough clearance.
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If too close in positive P&G layers, it means that the NPTH is
too close to copper features.