Sonnet User's Guide - Sonnet Software

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<strong>Sonnet</strong> User’s <strong>Guide</strong> Em dedicates the bulk of the analysis time for an ABS analysis in calculating the response data at the discrete data points. Once the adaptive band synthesis is complete, calculating the adaptive data for the entire band uses a relatively small percentage of the processing time. ABS Resolution The ABS resolution is the value in frequency units between adaptive data points in your response output from an adaptive sweep. Normally, the resolution in an adaptive sweep is provided by em such that around 300 data points are output for a frequency band. It is possible for you to override this setting and use a coarser or finer resolution for your frequency band. Entering a manual value to be used for ABS is done in the Advanced Options dialog box which is opened when you click on the Advanced button in the Analysis Setup dialog box. The Analysis Setup dialog box is opened when you select Analysis ⇒ Setup from the project editor menu. You enter the resolution by clicking on the Manual radio button in the ABS Resolution section of the Advanced Options dialog box and entering the desired resolution in the adjacent text entry box. For details on these dialog boxes, please refer to Help for the project editor. There are several things to be aware of when using the manual setting for the ABS resolution. Coarse resolution does not speed things up. Once a rational polynomial is found to “fit” the solution, calculating the adaptive data uses very little processing time. A really coarse resolution could produce bad results by not allowing the ABS algorithm to analyze at the needed discrete frequencies. Fine resolution does not slow down the analysis unless the number of frequency points in the band is above approximately 1000 - 3000 points. A step size resulting in at least 50 points and less than 2000 points is recommended. Q-Factor Accuracy There is a Q-Factor analysis run option available in the Advanced Options dialog box in the project editor (Select Analysis ⇒ Setup, then click on the Advanced button in the Analysis Setup dialog box). Selecting this option forces a higher accuracy for ABS convergence by including the Q-factor of your analysis as a criterion for convergence. This is done to insure high accuracy in the Q-Factor result when ABS is used. The Q-Factor is defined as follows: ( imagY nn ) ⁄ ( realY nn ) 116
Chapter 9 Adaptive Band Synthesis (ABS) The result is higher accuracy from the ABS sweep, but. this accuracy comes at the cost of requiring more discrete frequencies to be analyzed before conversion is reached. Running an Adaptive Sweep To run an analysis using the Adaptive Band Synthesis technique, you do the following: 1 Open your project in the project editor. 2 Select Analysis ⇒ Setup from the main menu of the project editor. The Analysis Setup dialog box appears on your display with an adaptive sweep already selected since Adaptive Sweep is the default for analysis control. 3 Select Adaptive Sweep (ABS) from the Analysis Control drop list if necessary. This selects the ABS technique for the analysis. 4 Enter the desired frequency band in the Start and Stop text entry boxes. This defines the frequency band on which you wish to perform the ABS analysis. The step size is automatically set by em during the analysis. See page 116 for a description of how the ABS resolution is determined. 117
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