Term |
Explanation |
|---|---|
NFP |
Non-functional pad. |
NPTH |
Non-plated through hole. |
PTH |
Plated through hole (component hole). |
Via |
Via drill. |
Text |
A feature of type text or a line, arc, or pad tagged with the feature attribute Copper Text. |
Circuit |
A line, arc or surface used to facilitate the flow of electricity. |
r0 |
Null feature ID. In many analysis categories there are two associated features, such as two pads in the pad to pad spacing category. Sometimes, when a drill annular ring is measured, there are two features, namely the pad and the drill. But there may be cases where there is an annular ring measurement between a drill and a drawn surface. In that case there is no pad to refer to; the ID will be an r0 null feature. |
RM |
Reliability Margin. The RM is defined in the ERF variables list at the end of each Action chapter. |
DRA |
Design Registration Allowance. The DRA for a category is the margin between the minimum measurement in the category and the RM. The DRA for a board is the minimum of all DRAs for categories for which a DRA is defined. |
Plated Hole |
This term is used to refer to PTHs and vias only. |