Chapter 1
User Interface
©
National Instruments Corporation
1-21
•
Degree Step
—This field becomes active when
Polar Grid
is
selected in the
Grid Type
field. Enter the desired distance
between the grid’s elements (dots, lines or crosses). Select the unit
of measure in the drop-down list to the right of this field—choices
are: degrees, radians, or grads.
•
Grid start offset
—This field becomes active when
Polar Grid
is
selected in the
Grid Type
field. Enter the distance to offset the
center of the polar grid:
X
is horizonatal offset;
Y
is vertical offset.
3.
Click
OK
to close the dialog.
To show or hide the visible grid, select
View»Grid
.
Copper Layers Tab
Use the
Copper Layers
tab of the
PCB Properties
dialog box to determine
the layer pairs that are acceptable for blind, buried or micro vias. This is
used when you try to place a via. Your choices will affect the cost of the
board, and should be confirmed with the board manufacturer.
This tab also allows you to set the default clearance for the board—the
distance from the edge of the board that is to be kept free of any other
elements. For example, if you try to run a trace through a clearance, or try
to place a part so that a pad is put within a clearance, a design rule error
occurs.
Note
If you used the
Board Wizard
, the layer information and clearance may already
have been set. Refer to the
, for more information.
Complete the following steps to set up the
Copper Layers
tab:
1.
Set the number of layer pairs you intend to use by entering the value or
using the up/down arrows in the
Layer Pairs
field. There should be at
least one layered pair to act as a core.
2.
Set the number of
Single Layer Build-ups
for both the top and
bottom. There should be at least one layered pair to act as a core.
3.
Select the
Micro Vias
,
Buried Vias
, or
Blind Vias
checkboxes to use
these in your design.
