Multisim simulation software is a commonly used circuit simulation software in the electronic industry. Now let's learn how to use some software to simulate circuits step by step from zero
Operation method
Find the software icon on the desktop and double-click to open the software. After entering the software, find the component. In the menu bar, place -- component. The shortcut key is Ctrl+w. Or click the component icon on the toolbar.
In the Select a Component dialog box, click the drop-down box under Group, and the component classification will appear below. Choose the type you want. If the required component cannot be found, the search function can also be used. Click Search to write the component name in the dialog box that appears. Remember to use the wildcard *.
Place the components and connect the wires. Here we take the operational amplifier electrogram as an example, as shown in figure. Click Run Circuit to simulate.
How to analyze the circuit? Relevant instruments are used to analyze voltage, current, waveform, phase, etc. Multisim provides comprehensive electronic instruments, which are on the right side of the software. When the mouse is placed on the instrument, the instrument name will appear. Only Oscilloscope is used here. The software provides two kinds of oscilloscopes, 2-channel and 4-channel. It is enough to select 2 channels and put them on the circuit as shown in the figure
Connect the voltage waveform circuit to be observed. Channel A of the oscilloscope is connected to the input voltage, and channel B is connected to the output of the operational amplifier. As shown in the figure. Click Run again. Double click the indicator to see the waveform.
In the oscilloscope, when the waveform is too dense, you can set the time Timebase or the voltage. As shown in the figure, we can't tell which is AB because of the red waveform. At this time, you can set the waveform color, and then run again. The waveform voltage and time can be seen clearly under the adjustment. Compare the two voltages at the same time. You can press the mouse from the far left and drag the time point you want to view. The current point voltage, time, and voltage difference will be displayed at the bottom. The rightmost can also be dragged in the same way.
From the waveform results, at the same time, the maximum value of point A is 5V, and that of point B is 15V. Three times the difference. From theoretical analysis, Vb=(1+R3/R2) * Va=3Va. So the positive solution of the result. In this way, we can combine theory with practice to learn the circuit
