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© National Instruments Corporation
Through Hole Pad Annular Ring
Footprints in the database have been designed with pad sizes in accordance
with the manufacturers' recommendations. To change these settings you
can edit the footprint in the database or directly on the design using the
In-place Part Edit command. Alternatively, you can apply a set of design
rules to specific footprints or to the entire design.
The annular ring setting (the ring of copper around the drill hole of a pad or
via) allows you to specify either a fixed value (for example, 50 mils) or a
relative value that depends on the radius of the drill hole size. For example,
a 50 mil drill hole (radius of 25 mils) with a relative value of .6 (60%) will
create an annular ring of 15 mils (60% of 25 mils). When using relative
settings, it is important to choose minimum and maximum values to ensure
that the annular ring will never go beyond those bounds.
Complete the following to enter an annular ring setting:
1.
Click the button beside the desired field (Top, Inner or Bottom) in the
Pad/Vias tab. The Through Hole Pad Properties dialog box appears.
Choose Fixed and enter the fixed value.
Or
Choose Relative and enter the relative setting. Be sure to choose Min
and Max values.
Complete the following to apply the design rules to a footprint:
1.
Select the footprint and choose Edit»In-Place Part Edit.
2.
Select the pads to which the rule should apply.
3.
Right-click and, from the context menu, choose Properties.
4.
On the
tab of the properties dialog box, enable Use Design Rules.
Pad
Vias
The Vias setting sets the default Drill Diameter and Pad Diameter to be
used when a via is placed during trace placement. This setting also applies
to vias that have already been placed in the design.
Microvias
The Micro Vias area is where you set the default via dimensions to be used
when a microvia is placed during trace placement. This setting will also
apply to microvias that have already been placed in the design.
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Chapter 1
User Interface
NI Ultiboard User Manual
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