The Teardrop Rules dialog is used to specify how teardrops are applied and what they are applied to when using Add Teardrops.
The general rule matching mechanism is described here.
Teardrops are used to create small areas of copper to make the transition between a pad (or via) to the track smoother.
Shortcuts
Menu: Setup
Default Keys: T
Command: Technology
Locating this option
Available from: Setup menu > Technology option > Rules - DFM/DFT - Teardrop page
Using the Teardrop Rules dialog
On selection, the Technology dialog opens, select Teardrop Rules . The existing Teardrop Rules for the Technology being used will be presented.
Navigation
The buttons to the right side of the dialog are used to navigate the grid, the general common buttons are detailed on the Technology Navigation page.
Using the editing pane
The appropriate teardrop rule is found for each net or pad by working down the list of rules until the first
match is found. Hence, the order of the rules is important. A match is when the specified Attribute
Name and Match Value match attributes of a net or pad. So the pad (or net) must have the given
attribute, and it’s value must wildcard match the value.
In particular, you can match the inbuilt attributes
On Layers
You must also specify if the rule applies to 
If you have any Areas defined in the design, a rule can be defined for a specific named area. Rules can be defined for any combination of Layers and Areas, as required. Similarly, a wildcard string can be defined to match areas. The matching areas must be marked as a Style Override Area and must have a name so they can be identified.
V-Angle
The V-Angle allows you to define the length of the teardrop based on the angle between the two sides of the V. A more acute angle therefore gives a longer teardrop. The default is 60 degrees. The angle must be between 0 and 180 degrees.
Shape
The choice of teardrop Shape is for the normal Triangle shape and the Curved Triangle shape. The Curved Triangle shape gives you a slightly less harsh shape than the traditional Triangle shape.
Use Length
You can check this to define the teardrop size by Length instead of using the V-Angle.
Once enabled, this entry allows you to define the size of the teardrop by its length from the edge of the pad (where the track and pad meet) to then end of the teardrop. The default is 50 thou. The length value must be greater than 0.
Once the teardrop has been added, the Shape, V-Angle and Length can be interactively changed using Teardrop Properties.
Apply Teardrops To
You can specify what types of pads can receive teardrops. You can choose Through Hole pads (including mounting holes), Surface Mount, Vias or Micro-vias. You can also decide if only Round Pads Only will receive teardrops, this applies in addition to the pad type restrictions.
Export and Import CSV
Use the Export CSV button to export the data in your PCB design into a CSV format file. Using the Export CSV option will provide you with a formatted template ready for you to edit in your own data.
Use the Import CSV button to import data back into the PCB design using a CSV format file.
The data in the file represents a spreadsheet of dialog contents with the data headings along the top row.
Units
The Units button allows you to locally switch between Metric and Imperial units whilst in this dialog. Once the dialog is closed, the units revert back to the original design units. If switching to different units to the design units, the value typed will be converted when you next enter this page.
Related Topics
Technology Overview | Using Dialog Grids Add Teardrops | Teardrop Properties | Design Rule Check | Export CSV | Import CSV