WrkBnchTutorial.pdf

Multisim Electronics Workbench

Tutorial

Multisim Electronics Workbench is available in several different versions including a

professional version, a demo version, a student version, and a textbook version. The

professional version is available in the labs on the CECS network and has all of the

Workbench features. The demo version may be downloaded from the Workbench

website at http://www.electronicsworkbench.com/html/eduproda.html. The

demo version is limited in that the user is unable to save or print results. A more fully

featured student suite version (limited to 100 components) is available for home use from

Prentice-Hall for about $80 dollars. Finally, the textbook version is packaged with

certain text books including the book currently being used in EE 210/215. It has some

limited features such as the user may have only 50 components but this version can read

and simulate larger files created on the professional version. This tutorial focuses on the

features in the textbook version.

Figure 1 shows the opening screen of Workbench. To use the program you choose a set

of components from the Parts Bin toolbar located on the left side of the screen and place

them on the screen. The components are connected by using the cursor to drag "wires"

between the parts. When the circuit is complete, you choose some type of measuring

instrument from the Instruments toolbar on the right side of the screen. For example, you

might connect an oscilloscope to the output of your circuit. This done, you can simulate

your circuit and observe the output on the instruments you connected.

Figure 1

The Multisim opening screen

Figure 2 lists the commonly used icons from the toolbars. Note that on the textbook

version some icons are grayed out since they are not available on this version (for

example there is no spectrum analyzer).

Parts Bin

Instruments

Source components. Includes dependent

and independent sources and grounds

Multimeter. Amps, volts, or Ohms.

Basic components. Resistors, capacitors,

inductors and variations

Function generator. Sine, square, and

triangular waveforms

Diodes. Includes LED's and bridge

networks

Wattmeter.

Bipolar and MOS transistors

Oscilloscope (2-Channel)

Analog components. Includes op amps

and other amplifiers

Bode plotter. Does both magnitude and

phase

TTL. A wide selection of 74 and 74LS

packages

Logic Analyzer

CMOS. 4xxx and 74HC components

Mode and Simulation

Miscellaneous digital including VHDL

and Verilog

Component mode button. Click this to add

components

Mixed analog/digital including converters

and 555 timer

Component editor to modify component

parameters.

Indicators. voltmeter and ammeter,

indicator lamps, and displays

Instruments. Click this to add an instrument.

Miscellaneous components including a

vacuum tube and a motor

Simulate button. Alternatively, push F5 to

toggle start/stop and F6 to pause.

Control system components such as

summers, multipliers, etc.

Analysis. Transient, AC, DC, and Fourier

included.

RF components

VHDL and Verilog simulation.

Electromechanical including a coil,

transformer, and a relay.

Report. Click this to generate a report.

Figure 2

The principle icons on the three main tool bars of Workbench.

Example 1

A simple resistor network

The circuit which we will simulate has a dependent voltage controlled current source,

four resistors, a battery, and a meter to measure the output. The finished circuit is shown

in Figure E1.

1.0kohm

2.0kohm

10V

0.001Mho

XMM1

2.0kohm

1.0kohm

Figure E1-1

A resistor network with a dependent current source.

To begin click on the Source Components icon on the Parts Bin tool bar. This produces a

selection of parts including various sources. Select a battery source from the menu by

clicking on it. Click once more on the blank screen to place the battery. Figure E2 shows

the result.

Figure E1-2

Select a battery voltage source and place it on the blank screen.

After placing the battery on the screen, double click on it to get a menu to set the battery

values. Change the battery value to 10 volts.

With the battery in place the next item to chose will be the voltage dependent current

source. Choose this from the Source Components in the Parts Bin . A voltage dependent

current source has a value in mhos or amps/volt. Set this value to 0.001 mhos. The

circuit also has a ground on either side of the dependent source. Select a ground symbol

from the Source Components and place them on the diagram. Your circuit should look

something like that shown in Figure E3.

There are four resistors to be added to the circuit and we are done with the sources menu.

You can close the source menu and open the Basic Components menu on the Parts Bin

tool bar. Note that there are two types of resistors in the parts bin. One type is a "real

world" resistor that has a value that you can purchase. The second type is a "virtual"

resistor that is idealized and can have any value you choose to assign to it. Choose a

1KΩ resistor and place it on the circuit diagram between the battery and dependent

source. Similary choose a 2KΩ resistor and place it immediately to the left of the

dependent source. You can rotate a resistor by right clicking on it and choosing one of

the rotation options. Choose another 1KΩ and 2KΩ resistor and place them to the right

of the dependent source. Rotate the resistors as needed so that your circuit looks like that

shown in Figure E4.

Figure E1-3

A battery and a voltage dependent current source have been placed.

Figure E1-4

The circuit with all of the components in place. Note that resistors can be rotated by right clicking on them

and choosing one of the rotation options.

With the components in place you are ready to connect the wires. Workbench has no

wire mode. You connect wires by moving the cursor to a component wire end, click on

it, go to a second component and click on its wire end. Workbench will then fill in a wire

between those two components. If you get a wire wrong, simply click on the wire and

push delete to get rid of it.

It may be tempting to place components close enough together so that their terminals

touch and thereby avoid having to connect them together with a wire. But this doesn't

work in Workbench. Components must be connected together by wires.

On occasion you may want to connect the end of one wire to a component. You cannot

begin a new wire from an old one unless you place a junction on the wire first. You can

do this from the Place menu at the top of the screen.

Sometimes Workbench does not choose a very good path between two points and the

wire makes the circuit appear cluttered or unnecessarily complicated or the wire path

passes through text. You can choose the path for any wire by clicking on intermediate

points on the screen to form corners or junctions. You do this by first clicking on a

component wire end, clicking on one or more intermediate points, and finally clicking on

the component wire end of the second component. The wire path will then go from the

first component through each intermediate point to the second component. After

connecting the wires in the example your circuit should look like that shown in Figure

E5.

1.0kohm

0.001Mho

2.0kohm

10V

2.0kohm

1.0kohm

Figure E1-5

The complete circuit with all of the components and wires in place.

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