To perform a Nyquist stability analysis, consider a simple type 0 system with the open-loop transfer function:

as shown in the diagram below.

**To generate the Nyquist
plot**

1.
Create the above diagram using a **const**, **transferFunction**, and
**plot** block.

2. Enter the following polynomial coefficients to the transferFunction block:

Numerator: 1

Denominator: 1 1

**Note:** Always leave spaces
between coefficient values.

3.
Choose **System** **>** **Go**, or click in the toolbar to simulate the diagram.

4.
Select the **transferFunction** block.

5.
Choose **Analyze** **>** **Nyquist** **Response**.

The Nyquist plot is displayed.

6. Drag on its borders to adjust its size.

The Nyquist plot for this system is a circle, with the real
part of *GH*(*s*) on the horizontal axis and the imaginary part of
*GH*(*s*) on the vertical axis. On this plot, the origin represents
*GH*(*j**∞*) and the point of intersection with the horizontal
axis (*Re*(*GH*) = 1) represents *GH*(*j*0)*.*