3. Performing a Pole-Zero Analysis

You can use the LabVIEW Control Design Assistant to analyze models to learn about the dynamic characteristics of a system.

Complete the following steps to analyze the poles and zeros of the model.

1. Right-click the empty white area of the Project View and select Control Design»Model Analysis»Pole-Zero Analysis from the shortcut menu to add a Pole-Zero Analysis step.

   	Note  In the Project View, a blue arrow indicates an output of a step. A red arrow indicates the input of a step. The blue and red arrows are shown below.
   	step output
   	step input

2. Click the Input Data tab on the Step Setup tab and verify that Model Data, the loaded model, is the input in the Model pull-down menu. You can use any outputs from previous steps in the project as inputs for later steps.
3. Click the Pole-Zero Analysis tab and notice that the Stability control indicates the system is stable.
4. Remove the checkmarks from the Autoscale Real Axis (X) and Autoscale Imaginary Axis (Y) checkboxes.
5. Select 0.5 at the top of the Imaginary axis of the Pole-Zero Map graph and enter 1.0 to change the axis on the graph.
6. Select –0.5 at the bottom of the Imaginary axis of the Pole-Zero Map graph and enter –1.0 to display the entire unit circle of the model.
   
   Notice that the poles of the model are less than 1 and within the unit circle. The numerical values of the zeros and poles locations appear in the Zeros and Poles tables.