To Create User-Defined Measures
1. Click 
Measures. The Measure Results dialog box opens.
Measures. The Measure Results dialog box opens.2. Click 
. The Measure Definition dialog box opens.
. The Measure Definition dialog box opens.3. Type a descriptive name for your measure, or accept the default name.
4. Select User defined under Type.
5. Select a quantity to specify the units for your measure.
6. Enter an expression in the entry box, or use these options to define an expression:
◦ Click 
to open the Operators dialog box.
to open the Operators dialog box.◦ Click 
to open the Constants dialog box.
to open the Constants dialog box.◦ Click 
to open the Functions dialog box.
to open the Functions dialog box.◦ Click 
to open the Variables dialog box.
to open the Variables dialog box.◦ Click 
to validate your expression and open the Expression Graph dialog box.
to validate your expression and open the Expression Graph dialog box.7. Select an evaluation method in the Evaluation method dialog box:
◦ Each time step
◦ Maximum
◦ Minimum
◦ Average
◦ Integral
◦ Root mean square
◦ At time
8. If you select At time, enter a real number value greater than zero in the Time box.
9. Click OK.
10. Graph the measure.