CD Bandwidth VI
Owning Palette: Frequency Response VIs
Installed With: 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. The data type you wire to the State-Space Model input determines the polymorphic instance to use.
This VI converts state-space and zero-pole-gain models into transfer function models before calculating the bandwidth.
Use the pull-down menu to select an instance of this VI.
 Place on the block diagram | Find on the Functions palette |
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.
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 | error in describes error conditions that occur before this VI or function runs.
The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code.
Use exception control to treat what is normally an error as no error or to treat a warning as an error.
Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.
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 | 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. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces.
Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error.
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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.
| ||||||
| error in describes error conditions that occur before this VI or function runs.
The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code.
Use exception control to treat what is normally an error as no error or to treat a warning as an error.
Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.
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| 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. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces.
Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error.
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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.
| ||||||
| error in describes error conditions that occur before this VI or function runs.
The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code.
Use exception control to treat what is normally an error as no error or to treat a warning as an error.
Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.
| ||||||
| 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. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces.
Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error.
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CD Bandwidth Details
This VI supports delays. Refer to the LabVIEW Control Design User Manual for more information about delays.