Create UOM classes

Create UOM classes when you need additions to the predefined classes in the UOM database.

1. In the navigator, click Unit of Measure.

2. Choose from the following actions.

   • On the toolbar, click the New Class icon.

   • Right-click in the Unit of Measure browser and select New Unit-of-Measure Class.

3. In the Unit-of-Measure Class Properties window, fill out the properties on the General tab.

   1. In the Name field, enter a name for the class. See Understand object naming guidelines, if necessary.

   2. Optional. In the Description field, provide a description of the UOM class.

   3. In the Canonical UOM field, type the name of the canonical UOM for this class. If the UOM does not exist, PI AF creates it when it creates the new class.

   4. In the Canonical UOM Abbreviation field, enter a unique abbreviation.

   5. In the Base Units of Measure field, enter a calculation for the unit of measure. Choose from the following actions.

      To ...	Do this ...
      Add a base class calculation	Click . In the Add Base UOM Class window, select a base class from the Base UOM Classes list. In the Base Power field, type the exponent value or click one of the arrow keys until the exponent you want is displayed. Click OK. Repeat these steps as needed, to create a multiplication (positive base power) or division (negative base power) calculation.
      Remove a base class calculation	Select a base class calculation entry. Click . In the Delete confirmation window, click Yes.

   Note: If you are defining a base class, leave the Base Units of Measure field blank.

4. Optional. You can add new units of measure to the class you are defining.

   1. Click the Units of Measure tab.

   2. Right-click in the list and select New Unit of Measure.

   3. In the Unit of Measure Properties window, define the new unit of measure. For more information, see Create units of measure.

5. Click OK.