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NI Multisim

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NI Multisim NI Multisim  (formerly  MultiSIM ) is an electronic schematic capture and simulation program which is part of a suite of circuit design programs, along with NI Ultiboard. Multisim is one of the few circuit design programs to employ the original Berkeley SPICE based software simulation. Multisim was originally created by a company named Electronics Workbench, which is now a division of National Instruments. Multisim includes microcontroller simulation (formerly known as MultiMCU), as well as integrated import and export features to the Printed Circuit Board layout software in the suite, NI Ultiboard. Multisim is widely used in academia and industry for circuits education, electronic schematic design and SPICE simulation. History Multisim was originally called  Electronics Workbench  and created by a company called Interactive Image Technologies. At the time it was mainl...
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Faster Simulation with the Multisim Active Analyses

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Faster Simulation with the Multisim Active Analyses
Introduction
Multisim now offers an active analysis toolbar. Active analyses, in conjunction with the new schematic probes, offer an easy and fast way for an engineer to run SPICE circuit simulations and quickly analyze electronic circuits to gain deeper understanding of the simulation results.
Active Analysis
The simulation and analysis workflow has been improved to make it more intuitive to set up and simulations and analyses.
 All analyses and their settings are now accessed from the dialog box Simulate»Analyses and simulation or the new active analysis button in the Simulation toolbar. This button also shows the name of the active (selected) analysis. In the example below, Interactive simulation is the active analysis:
  Simply by clicking the play button, the selected analysis will start running. You will be able to visualize the simulation results either in the Interactive Simulation mode or any of the non-interactive advanced analyses.
Interactive Simulation
The interactive simulation is the first analysis type in the list of analyses supported by Multisim. It runs in transient time where the results are shown on simulation-driven instruments (such as the Oscilloscope, DMM, and Bode Plotter) as well as the new probes to take instantaneous time and frequency measurements of voltage, current, and power on your circuit.
Another advantage of the interactive simulation is that you vary the value of interactive components such as variable resistors, switches, and variable voltage sources and visualize the simulation results instantaneously.
1. Simulation Steps
  1. In the Multisim menu click on File>Open Samples
  1. Click on the Analog folder and open the SpeechFilter example
  1. The circuit will open, from the toolbar select a Voltage and Current probe and place it on the input node V5. Also, select a power probe and place on the resistor R5
  1. The simulation will run, notice all the interactive measurements taken on the different probes
  1. You no longer need to manually add variables for analysis on the output tab - just place a probe on the node where you want to take a reading, select the active analysis in the Analyses and Simulation dialog box and click the Run button in either the dialog box, or the Simulation toolbar.
  1. Click on the selected analysis in the toolbar (previously set as Interactive)
  1. Select the AC Sweep analysis in the left hand menu and notice the preselected parameters based on the probes placed on the schematic.
  1. You can click Run and the simulation will immediately start, or you can click Save and return to the schematic and start the simulation from the toolbar
  • The Interactive simulation settings button has been removed from the Simulation toolbar. Interactive simulation settings have been incorporated into the Analyses and Simulation dialog box.
  • The Interactive simulation settings dialog box has also been removed. Its contents are now in the Analyses and Simulation dialog box.
  • The selected active analysis is saved with the file and the next time the file is opened it will be selected as the active analysis. The default analysis for new designs is interactive simulation.
  • For files saved in versions older that Multisim 14.0, the active analysis when opening the file is set to interactive simulation.
  • All analyses, including interactive simulation are configured from the Analyses and Simulation dialog box.
  • You can start the active analysis (the one selected in this dialog box) by clicking the Run button in the dialog box, the Simulate menu, or the Simulation toolbar.
Advanced Analyses
If you need to further investigate the circuit performance, you can select between 20 advanced analyses available in Multisim such as AC analysis, DC Sweep, Noise, and Monte Carlo. Significant improvements have been made to the process of running and defining simulation results and running an analysis, so that you can run accurate simulations and get to results as quickly as possible:

     2. The Run button in the Simulation toolbar now starts the selected (active) analysis. 
    Once you start the analysis, the Multisim Grapher will open to display the simulation results
Important Updates in Multisim 14.0

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