University of Engineering and Technology Peshawar (Mardan Campus)

An Introduction to Multisim Electronics Workbench Basic Electrical Engineering Lab

Lab No. 7

Presented ByEngr. Syed Muhammad Umar

(Visiting lecturer in Electrical Department)

Multisim TutorialAn Introduction to Multisim

Electronics Workbench

An Introduction to Multisim Electronics Workbench

• Simulation is a mathematical way of emulating(Emulation refers to the ability of a computer program in an electronic device to emulate (imitate) another program or device) the behavior of a circuit. With simulation,

• You can determine a circuit’s performance without physically constructing the circuit or using actual test instruments. Multisim is a complete system design tool that offers a very large component database, schematic entry, full analog/digital SPICE simulation, etc. It also offers a single easy to use graphical interface for all design needs.

Multisim Interface TutorialThis tutorial will introduce the Multisim

interface.Assumptions:

– You have Multisim version 11.0 installed on your computer.

– You can start the program successfully. – An instruction to click means to left click with

the mouse or other pointing device.– If you are to right-click or double-click, you

will be instructed to do so.

Multisim Interface

Circuit WindowDesignToolbox

Toolbars

Toolbars

• Multisim has movable toolbars located at the top and side of

the screen.• The following slides identify

the most commonly used toolbars.

Standard Toolbar(new, open file, save file, print, etc.)

View Toolbar(zoom in, zoom out, etc.)

Component Toolbar(place components, such as sources, basic elements, etc.)

Main Toolbar

Run Simulation Stop Simulation

Instrument Toolbar

Function Generator

Oscilloscope

Multimeter

Draw a Simple CircuitTo place components on the window,

you can:─ Click on the component

toolbar, then browse for the part.

─Click Place on the menu bar, select Component, then browse for the part.

Place Power and Ground

Click the Place Source button on the Components toolbar.

Now choose DC Power and click OK.

Click GROUND, then click OK.

Under Group, click the drop-down arrow and click Indicators.

Next, we will place a Virtual Lamp from the Indicators menu.

Choose VIRTUAL_LAMP under Family.

Click OK and place the part on the Circuit Window

Now we can repeat the part placement to place a switch. See if you can find the switches in the Basic Group.

Place a switch. Choose the switch labeled SPST for single pole, single throw.

We have placed all of the components that we need for now. Click Close.

Parts can be moved. Make sure that the component has a blue box around it. Arrange the components to match the above configuration.

Wiring

To begin wiring, hover the cursor over a part terminal (end pin). Notice that the cursor changes shape to indicate that you are starting a wire.

Cursor shape changes, showing that a wire is beginning on the ground symbol.

Circuit window after clicking on the source terminal

Click once. Now you can start the wire. To end the wire, click on another terminal.

Continue Wiring

• Click on the top of the source. Move the cursor to the left switch terminal and click again. This should draw a wire connecting the parts.

• Continue wiring the circuit until you have a complete circuit.

Now the circuit is complete. We will start the simulation by using the Play button.

Click here to start the simulation.

Running the SimulationOnce your simulation is running, click on the Circuit Window, then press the Space bar on the keyboard. This will operate the switch.

Press the space bar on the keyboard again. What happens?

Simulation Running

Simulation NotRunning

Options• You have great flexibility in

setting up the view that you want.

• For example, if you are not using the Design Toolbox, you can close it by clicking on the X at the top left of the toolbar.

Virtual vs. Real Components

• Real components have a specific value that cannot be changed and a footprint used for circuit board layout.

• Virtual components are for simulation only.

• For our purposes, there is almost no difference between the component types.

Real Resistor: value cannot be changed

Virtual Resistor: value can be changed (double click the 1k label)

Virtual Multimeter (Instruments toolbar)

Wiring Hints

To start a wire with no component terminal nearby:– Double-click anywhere in the Circuit window

to start the wiring action.– Double-click anywhere to end the wiring

action.– From the menu bar, choose Place, then

Junction, to place a junction. Start the wire at this point.

Wiring Hints– Single-click while wiring to place a corner.– Right-click while wiring to delete the wire.– Multisim uses an automatic wire router. This

can cause trouble if two terminals are very close to each other.

Ctrl R rotates a component clockwise. You can also right-click and choose a rotation method.

Resistor R2 and R3 terminals are too close.

Circuit layout is easier to follow with components separated.

References

Herniter, M.E. (2004). Schematic capture with electronics workbench multisim. Upper Saddle River, NJ: Pearson Prentice Hall.

Shields, T. (2005). Practical teaching ideas with multisim. Electronics Workbench. Retrieved from http://www.electronicsworkbench.com/ academic/