Postprocessor Basic Steps

Multisim Help


Edition Date: February 2017
Part Number: 375482B-01
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Multisim 14.0 and 14.0.1 Help
Multisim 14.1 Help
Multisim 14.2 Help

To construct an equation from which a trace will be plotted, you select variables and mathematical functions.

  You must have done an analysis on the design you wish to use with the postprocessor in the existing Multisim session so that simulation results are available.

Complete the following steps to build an expression:

  1. Click the Postprocessor button on the Main toolbar or select Simulate»Postprocessor to display the Postprocessor dialog box.
  2. Select the Expression tab.
  3. The following sections are available:

    • Select simulation results—This list contains analyses which have been performed in this session. These names are composed of the design name concatenated with the analysis type. For example, AmplitudeModulator_Transient_Analysis in the figure below.
    • Variables—This lists the variables that are available, depending on the analysis selected in Select simulation results.
    • Functions—This lists the mathematical functions available for use in the expression.
    • Expressions—This is where you build the Postprocessor expression. Expressions from earlier sessions may appear here. To remove, highlight the expression and click Delete.


  4. From the Variables list, select the variable you want to include in the equation, and click Copy variable to expression.
  5.   The Variables list contains the variables selected in the Selected variables for analysis list in the analyses Output tabs. To filter the Variables list to show only certain variables, choose from the drop-down list, for example, All voltages.



  6. From the Functions list, select the mathematical function you want included in the equation for this trace, and click Copy function to expression. To filter the Functions list to show only certain mathematical functions, choose from the drop-down list of options. Refer to the Postprocessor Function Examples section for more information.
  7.   Depending on the function, the order of steps  3 and  4 is interchangeable.

      It is possible to manually type or modify a trace’s equation although you should exercise caution if doing so.

  8. Continue to choose analyses, variables and functions until the equation is complete. The order in which you make your selection will depend on the equation your are building. For more complex equations, you may need to go back and forth between the Variables and Functions several times.
  9. Click Add if you wish to add another expression.


Complete the following steps to view the results of the finished expression:

  1. Select the Graph tab in the Postprocessor dialog box.
  2. Click the Add button to the right of the Pages section. A default name will appear in the Name column of the Pages section. This is the name of the tab that will display the results in the Grapher. Change the default name if necessary.
  3. Click the Add button to the right of the Diagrams section. A default name will appear in the Name column of the Diagrams section. This is the title of the diagram that will be displayed in the Grapher. Change the default name if necessary.
  4. Click in the Type column of the Diagrams section and choose Analog graph, Digital graph or Chart from the drop-down list that appears.
  5. In the Expressions available section, select the equation you want to calculate.
  6. Click the > button to move the equation to the Expressions selected field. The dialog box will resemble the following example:


  7. Click the Calculate button. The Grapher displays the results of the calculation.


  8.   The example above creates an analog graph. You can also create digital graphs and tables. This is done in the Type column of the Diagrams section.

 

Related Information

Postprocessor Function Examples

Pages, Traces, Graphs and Charts in the Postprocessor

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