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.
- 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
- 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.
- Click the Pole-Zero Analysis tab and notice that the Stability control indicates the system is stable.
- Remove the checkmarks from the Autoscale Real Axis (X) and Autoscale Imaginary Axis (Y) checkboxes.
- 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.
- 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.
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