Справочник Пользователя для National Instruments Ultiboard

© National Instruments Corporation

A teardrop is a flair that you can add to a trace where the trace connects to 
a pad. This is typically used with very small sized traces, to prevent 
possible breakage in the copper between the trace and the pad. 

Complete the following steps to add teardrops: 

1.

Select Design»Add Teardrops. The Teardrops dialog box displays.

2.

Select the Units for the teardrop length. 

3.

In the Length box, enter the Preferred and Minimum length for the 
teardrops. The preview area changes as the lengths are changed. 

4.

In the Apply to box, select the following as desired: 

•

Selected pads radio button—Teardrops will be added to the pads 
that are currently selected on the workspace. 

•

All of the following radio button—When selected, enables the 
SMT pins, THT pins and Standard vias checkboxes; check as 
desired.

5.

In the On DRC error box, select the desired radio button. Choices are 
Do not create teardrop; Ask for confirmation; Create teardrop. 

6.

Enable or disable the Ignore pad without net checkbox as desired. 

7.

Click OK to add the teardrops are added. 

To remove all teardrops select Edit»Copper Delete»All Teardrops. 

All copper elements (traces, copper areas, and powerplanes) share the same 
three properties tabs (Attributes, General, and Position). The fourth tab 
for traces is Line, and the fourth tab for copper areas and powerplanes is 
Copper Area.

The General tab is where you edit the properties of the selected copper 
element. 

Complete the following steps to edit the contents of the General tab: 

1.

In the Measurements box, set the desired Width. Net shows the net 
to which the element is connected, if any. It is read-only. 

2.

In the Autorouter Settings box, select either Trace is Fixed or Trace 
can be Moved. User-placed traces are fixed (default setting) so that 
they will not be moved when autorouting is performed.