Alternatively, specify a vector of frequency points to use for evaluating and plotting the frequency response. Compare the frequency response of a continuous-time system to an equivalent discretized system on the same Bode plot. The Bode plot of a discrete-time system includes a vertical line marking the Nyquist frequency of the system. Specify the line style, color, or marker for each system in a Bode plot using the LineSpec input argument. The first LineSpec , 'r' , specifies a solid red line for the response of H.
The second LineSpec , 'b--' , specifies a dashed blue line for the response of Hd. If you do not specify frequencies, bode chooses frequencies based on the system dynamics and returns them in the third output argument. The third dimension is the number of frequencies in wout. Thus, each entry along the third dimension of mag gives the magnitude of the response at the corresponding frequency in wout.
For instance, examine the dimensions of mag. Thus, for example, mag 1,3,10 is the magnitude of the response from the third input to the first output, computed at the 10th frequency in w. Similarly, phase 1,3,10 contains the phase of the same response. Compute the standard deviation of the magnitude and phase of an identified model.
Identify a transfer function model based on data. Obtain the standard deviation data for the magnitude and phase of the frequency response. Create a Bode plot of a model with complex coefficients and a model with real coefficients on the same plot.
In log frequency scale, the plot shows two branches for complex-coefficient models, one for positive frequencies, with a right-pointing arrow, and one for negative frequencies, with a left-pointing arrow. In both branches, the arrows indicate the direction of increasing frequencies. The plots for real-coefficient models always contain a single branch with no arrows. You can change the frequency scale of the Bode plot by right-clicking the plot and selecting Properties.
In the Property Editor dialog, on the Units tab, set the frequency scale to linear scale. Alternatively, you can use the bodeplot function with a bodeoptions object to create a customized plot. In linear frequency scale, the plot shows a single branch with a symmetric frequency range centered at a frequency value of zero.
The plot also shows the negative-frequency response of a real-coefficient model when you plot the response along with a complex-coefficient model. Dynamic systems that you can use include:. For tunable control design blocks, the function evaluates the model at its current value for both plotting and returning frequency response data. For uncertain control design blocks, the function plots the nominal value and random samples of the model.
When you use output arguments, the function returns frequency response data for the nominal model only. Frequency-response data models such as frd models. For such models, the function plots the response at frequencies defined in the model.
Identified LTI models, such as idtf , idss , or idproc models. For such models, the function can also plot confidence intervals and return standard deviations of the frequency response.
See Bode Plot of Identified Model. If sys is an array of models, the function plots the frequency responses of all models in the array on the same axes. Line style, marker, and color, specified as a string or vector of one, two, or three characters. The characters can appear in any order. You do not need to specify all three characteristics line style, marker, and color.
For example, if you omit the line style and specify the marker, then the plot shows only the marker and no line. For more information about configuring this argument, see the LineSpec input argument of the plot function.
Example: 'r--' specifies a red dashed line. Example: 'y' specifies a yellow line. If w is a vector of frequencies, then the function computes the response at each specified frequency. For example, use logspace to generate a row vector with logarithmically spaced frequency values. The vector w can contain both positive and negative frequencies. For models with complex coefficients, if you specify a frequency range of [ w min , w max ] for your plot, then in:.
Log frequency scale, the plot frequency limits are set to [ w min , w max ] and the plot shows two branches, one for positive frequencies [ w min , w max ] and one for negative frequencies [— w max ,— w min ]. Linear frequency scale, the plot frequency limits are set to [— w max , w max ] and the plot shows a single branch with a symmetric frequency range centered at a frequency value of zero.
Magnitude of the system response in absolute units, returned as a 3-D array. For SISO systems, mag 1,1,k gives the magnitude of the response at the k th frequency in w or wout. For an example, see Obtain Magnitude and Phase Data. For MIMO systems, mag i,j,k gives the magnitude of the response at the k th frequency from the j th input to the i th output. Phase of the system response in degrees, returned as a 3-D array. For SISO systems, phase 1,1,k gives the phase of the response at the k th frequency in w or wout.
For MIMO systems, phase i,j,k gives the phase of the response at the k th frequency from the j th input to the i th output. Some of them are technically necessary, while others help us to improve this website or provide additional functionality.
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The new Automation Interface 3. X brings several advantages to you: Compatibility with the new Bode Hardware-Revision 2 Use the predefined measurement modes of Bode Analyzer Suite Control more than one Bode from one PC Perform faster measurements especially single-point measurements Use events to build real-time applications Fully compatible with 32 bit and 64 bit Microsoft Windows systems Directly access the Automation Interface from.
Previous Version. Legacy Versions Old Software Versions. CD Bode Analyzer Suite v2. Bode Redist Package v2. Bode Analyzer Suite 3. Compare measurements with theoretical transfer functions using our new Expression Traces.
Evaluate complex mathematical expressions using measurement data and memory data Benefit from several bugfixes see: Version Information. Updated USB driver for Bode Revision 2 devices to latest version from manufacturer Several minor bugfixes Automation Interface: Added "Remove double frequency " and "Clear " to the Shaping functions to allow modifying shaped measurements Bugfixes and details can be found in: Version information.
Averaging feature Smith-chart in fixed-frequency measurements Several bug-fixes see: Version information. Gain slope at crossover frequency Long memory names are displayed via mouse-over For a detailed list of improvements and known issues, see: Version information. NET access. Internal Calibration is stored in the Automation Interface Resolved impedance measurement issue from kHz Minor bug fixes.
New commenting feature added for all measurement modes Improved Calibration time out handling for low receiver bandwidths Some cosmetic bug fixes. Phase Margin Calculation for non-invasive stability measurement of power supplies added Logarithmic scaling and improved zoom possibilities for shaped level setup screen added Improved visibility of gridlines Minor bug fixing. User manual for Bode and BAS 3. X 2 MB Download. Bode product brochure KB Download.
If you are still using Bode Analyzer Suite 2. X, feel free to download the old user manual below. User manual for Bode and BAS 2.
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