CD Bandwidth VI

Owning Palette: Frequency Response VIs

Requires: Control Design and Simulation Module

Calculates the frequency, relative to the DC gain, at which the magnitude of the frequency response drops below Magnitude Drop (dB). You can use the CD Bandwidth VI only with single-input single-output (SISO) systems. Wire data to the State-Space Model input to determine the polymorphic instance to use or manually select the instance.

This VI converts state-space and zero-pole-gain models into transfer function models before calculating the bandwidth.

Details  Example

CD Bandwidth (State-Space)

	State-Space Model contains a mathematical representation of and information about the system for which this VI determines bandwidth.
	Magnitude Drop (dB) is the magnitude in decibels that defines the level up to which this VI calculates the bandwidth frequency. The default value is –3 dB.
	Frequency Unit specifies the units of frequency, either in Hertz or radians/seconds, to use in calculating the bandwidth. 0 Hz 1 rad/s (default)
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	Bandwidth is the frequency, relative to the DC gain, at which the magnitude of the frequency response of the system falls below Magnitude Drop.
	error out contains error information. This output provides standard error out functionality.

CD Bandwidth (Transfer Function)

	Transfer Function Model contains a mathematical representation of and information about the system for which this VI determines bandwidth.
	Magnitude Drop (dB) is the magnitude in decibels that defines the level up to which this VI calculates the bandwidth frequency. The default value is –3 dB.
	Frequency Unit specifies the units of frequency, either in Hertz or radians/seconds, to use in calculating the bandwidth. 0 Hz 1 rad/s (default)
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	Bandwidth is the frequency, relative to the DC gain, at which the magnitude of the frequency response of the system falls below Magnitude Drop.
	error out contains error information. This output provides standard error out functionality.

CD Bandwidth (Zero-Pole-Gain)

	Zero-Pole-Gain Model contains a mathematical representation of and information about the system for which this VI determines bandwidth.
	Magnitude Drop (dB) is the magnitude in decibels that defines the level up to which this VI calculates the bandwidth frequency. The default value is –3 dB.
	Frequency Unit specifies the units of frequency, either in Hertz or radians/seconds, to use in calculating the bandwidth. 0 Hz 1 rad/s (default)
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	Bandwidth is the frequency, relative to the DC gain, at which the magnitude of the frequency response of the system falls below Magnitude Drop.
	error out contains error information. This output provides standard error out functionality.

CD Bandwidth Details

This VI supports delays. Refer to the LabVIEW Control Design User Manual for more information about delays.

Example

Refer to the CDEx Frequency Analysis VI in the labview\examples\Control and Simulation\Control Design\Frequency Analysis directory for an example of using the CD Bandwidth VI.