System functions : Nyquist Plot
The Nyquist Plot shows the course of the system function on the imaginary axis. Its course provides information about the stability behaviour of the system.
Unlike other graphics, the settings and graphics are located in the same window.
Only functions containing the variables z and param are permitted. Alternatively, the variables x and y can be used as shorthand for the real and imaginary parts. Enter the desired function in the input field for the function, or select one of the existing functions by clicking on the arrow to the right of the input field.
CGRAPH plots trajectory curves as functions of the imaginary axis within the value range for the variable z. Complex numbers are permitted for both z and the parameter.
After clicking on the Create graph button, CGRAPH displays the Nyquist Plot.
The default values can be viewed in the tree on the left-hand side. Clicking on the (optional) parameter also unlocks the parameter's adjustability in the complex plane. An explanation of this function can be found in the notes on changing the parameter in the graphic display.
The values can be changed retrospectively. The graphic is adjusted automatically, at the latest when the Create graphic button is clicked. Clicking on the coloured symbol for the function etc. allows you to quickly hide the graphic from the display. Double-clicking on the text allows you to adjust the graphical display.
The display of the axes is also part of the tree, as the graphics for this graphic type are independent of each other and can be set separately.