Unit Relationships—Key Exercises

Main Exercises

Purpose: The purpose of these exercises is to view the relationship between a base unit and the units derived from that unit, and also to view the relationship between different units that are derivatives of the same base unit.

Windows:
Unit Relationships

Viewing Base Units

In this exercise you will review the base units that are active in the system environment. 

  1. Open the Unit Relationships window and click on the Base tab.
  2. Populate the tab and review the existing base units.

Note: The base units displayed on this window are the base units that have selected the Used In Application check box in the Units of Measure tab of the ISO Code Usage window.

Viewing Derived Units

The Derived tab in the Unit Relationships window gives you an overview of the units that can be derived from a certain base unit.

  1. Click on the Derived tab in the Unit Relationships window.
  2. Populate the tab.
  3. In the Base Unit Code list, select m (meter).
  4. Review the units that can be derived from this base unit.

Note: Only the units that have selected the Used In Application check box in the Units of Measure tab of the ISO Code Usage window can be viewed in this window.

Entering New Derived Units

You can enter new derived units directly under the Derived tab for a base unit.

  1. Perform a query in the Derived tab, and enter rpm into the Base Unit Code field as the search criterion.

Note:  This base unit (which is user-defined) has no relationship with any other units of measure.

  1. Create a new table row. 
  2. Enter the following information into the row:
Unit
Code		 Description Factor
krpm thousand rounds per minute 1000
  1. Save the new unit.

Viewing a Conversion Factor

In this exercise, we want to know how one unit can be converted into another and what the conversion factor is between the two factors. This requires that the two units are derivatives of the same base unit. In this case we want to know how we can convert millimeters into meters.

  1. Click on the Conversion tab.
  2. Perform a query and enter mm in the Selected Unit field as the search criterion.
  3. Review the other units of measure that have the same base unit as millimeters.
  4. Review the value in the Conversion Factor field in the row that describes meters (m).

Note: By multiplying a value measured in millimeters with the value in the Conversion Factor field in the meters row, you will get the same measure expressed in meters.

  1. Perform the same procedure for the unit rpm and review the value in the Conversion Factor field for the krpm unit which you created in the previous exercise.