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Table of Contents  

Section 1: INTRODUCTION ................................................................................................................................ 1-1

Section 2: MULTISIM .......................................................................................................................................... 2-1

Section 3: ELVIS II ............................................................................................................................................... 3-1

 

 

EEL3003L NI Multisim and ELVIS II – An Introductory Guide EEL3112L

1-1  

SECTION 1: INTRODUCTION This elemenetary guide is intended to provide the students with a brief introduction to the basic elements of National Instruments Multisim and Educational Laboratory Virtual Instrumentation Suite (ELVIS). The students are assumed to basic knowledge of circuit theory and the operating characteristics of various circuit elements such as resistors, capacitors, inductors, diodes, and operational amplifiers. In particular, it is essential that those students taking laboratory courses EEL3003L or EEL3112L should read this guide thoroughly and have a good understanding of the contents. Multisim is an interactive circuit simulator capable of capturing schematics and then instantly simulating the resulted circuits. The Multisim environment is a single, easy-to-use graphical interface for practically all circuit design needs. It is a complete circuit design tool that offers full analog and digital SPICE simulations supported by a very large component database. Multisim is integrated with National Instruments Labview and SignalExpress, thereby allowing the users to tightly integrate circuit design and test in a seamless manner. ELVIS is a computer-based instrumentation platform fully integrated with Labview. It consists of a bench-top workstation, a prototyping board, a multifunction data acquisition device, and a set of virtual instruments driven by Labview. Collectively, such a combination platform constitutes a computer-based prototyping environment fully equipped with functionality comparable to instruments such as digital multimeter, oscilloscope, and function generator found on the laboratory workbench. The integration of NI ELVIS with Multisim provides the mechanism for comparing circuits designed in a simulated environment with circuits prototyped in a hardware platform. Such pairing forms a comprehensive tool for studying a multitude of engineering subjects, including circuit design, instrumentation, controls, telecommunications, and embedded/MCU (microcontroller) theory. Furthermore, the integration of NI ELVIS with Multisim makes the transition from simulation to prototype building smooth. It is possible to design a circuit using NI ELVIS virtual instruments within Multisim. A circuit designed in Multisim can be built virtually on the 3D simulated NI ELVIS proto-board. The design can then be taken another step further onto the actual NI ELVIS prototyping board. This process effectively allows the simulated measurements to be presented simultaneously with the real NI ELVIS measurements in the same display. Connecting theory and real-world measurements in such a streamline manner helps minimizing the time spent in troubleshooting. Note: For more detailed descriptions of various elements of Multisim and ELVIS, the students are encouraged to consult the pertinent documents published by National Instruments available at its website http://www.ni.com.

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EEL3003L NI Multisim and ELVIS II – An Introductory Guide EEL3112L

2‐15  

2.5 Schematic Capture Schematic capture is the first stage in developing a circuit design. In this stage, circuit components are placed on the circuit window at the desired locations with proper properties, orientations, and labels. These components are subsequently wired together before simulation is performed. Furthermore, the component properties or attributes can be modified to provide flexibility in simulation. This guide covers several basic but important aspects of schematic capture, which include  placing components, wiring components, net naming, copying and pasting schematics, and capturing screen area. To help the users learning schematic capture more effectively, relevant illustrations are used in a timely manner alongside the discussion of these key aspects. Note: The users are encouraged to consult the Multisim online help file for more detailed descriptions of various elements involved in schematic capture. 2.5.1 Placing Components The first step in schematic capture is to place the appropriate components on the circuit window. In Multisim, the components are organized by database, group, and family. Furthermore, the components are stored in three different database levels: master database, corporate database, and user database. Note: The default database is set in the master database level. In fact, the EEL3003L and EEL3112L labs always utilize the components stored in the master database. (a) Component Browser The placement of most components can be accomplished via the component browser. Its dialog box, as shown in Figure 2.5.1, appears immediately upon the execution of the selection-click sequence below:

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2‐19 

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VIS II – An Intr

2‐21 

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2‐22 

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VIS II – An Intr

2‐23 

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VIS II – An Intr

2‐24 

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2‐25 

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VIS II – An Intr

2‐26 

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VIS II – An Intr

2‐27 

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VIS II – An Intr

2‐28 

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EEL3003L NI Multisim and ELVIS II – An Introductory Guide EEL3112L

2‐29  

(e) Placed Component Properties Each component available in Multisim is characterized by a set of properties that control certain aspects of the component beyond those inherently stored in the database. These properties affect only the placed component, but not other instances of the same component in another circuit or in another location of the same circuit. Depending on the type of component, these properties may determine some or all of the following aspects: The identifying information and labels about the placed component displayed on the circuit window The model of the placed component If applicable, how the placed component is used in analysis. The faults used for the placed component The component value or model and footprint The user fields

Modifying Component Labels and Attributes It is not unusual that one may want to modify the default component labels and attributes. The procedure for assigning a label or changing the reference designator (RefDes) of a placed component is described below.

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Step 1: Douas s

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VIS II – An Intr

2‐30 

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VIS II – An Intr

2‐31 

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VIS II – An Intr

2‐32 

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EEL3003L NI Multisim and ELVIS II – An Introductory Guide EEL3112L

2‐39  

The first task of utmost importance is to capture the schematic of this non-inverting op-amp circuit design. The step-by-step schematic-capture procedure is described below.

Step 1: Start Multisim (if necessary) Apply the click sequence Start » All Programs » National Instruments » Circuit Design Suite 11.0 » Multisim 11.0  

Step 2: Place components in the op-amp circuit design First launch the component browser to display the dialog box using the shortcut key Ctrl‐W. Next apply the following command sequences in succession to place each and every component: First ground: >> Sources >> POWER_SOURCES >> GROUND >> OK >> Click to place at desired   location 

 Second ground: Copy the first ground and then paste.  First DC power supply: >> Sources >> POWER_SOURCES >> DC_POWER >> OK >> Click to place     at desired location  Second DC power supply: Copy the first DC power supply and then paste    First resistor: >> Basic >> RESISTOR >> 1k >> OK >> Click to place at desired location  Second resistor: Copy the first resistor and then paste AD712 op-amp: >> Analog >> OPAMP >> AD712JR >> OK >> A >> Click >> Cancel >> Close 

   Note: Referring to the component browser shown below, one may notice component AD712JR is

selected even though any op-amp of the AD712 type may be used. Further, the Click operation in each command sequence described above is best interpreted as clicking at a desired location on the circuit window to place the pertinent component.

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2‐43  

Step 3: Wire the components in the amplifier circuit design Connecting the components smoothly is assured by the wiring techniques discussed in section 2.5.2.

The exercise is further simplified by the fact that Multisim is a modeless wiring environment. This means Multisim determines the functionality of the mouse cursor by its position. In this illustration, the wiring process is segmented into three phases as described in the following.

Wiring op-amp AD712JR Place an open-ended wire connected to the positive input Pin 3 to form net 1. Place a wire connecting resistor R2 and the negative input Pin 2 to form net 2. Place an open-ended wire connected to output Pin 1 to form net 3. Place a wire connecting resistor R1 and net 3. This wire now becomes a part of net 3. Place a wire connecting resistor R1 and net 2. This wire now becomes a part of net 2. Place a wire connecting resistor R2 and the ground. This wire becomes net 0 by default. Place an open-ended wire connected to Pin 4 to form net 4. Place an open-ended wire connected to Pin 8 to form net 5. Wiring DC power supplies Place an open-ended wire connected to the positive terminal of V1 to form net 6. Place an open-ended wire connected to the negative terminal of V2 to form net 7. Place a wire connecting the negative terminal of the 12-V DC voltage source V1 and the positive

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2‐49 

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EEL3003L NI Multisim and ELVIS II – An Introductory Guide EEL3112L

2‐50  

2.6 Simulation In general terms, simulation refers the imitation of some real system or physical process. A meaningful simulation inevitably entails a reasonable understanding of the characteristics or behaviors of a selected system or process. Simulation is deployed in many contexts, including the modeling of natural and engineering systems in order to gain insight into their functioning. In particular, simulation is extensively used to analyze real systems or processes that may be inaccessible or dangerous to engage. Two critical issues in simulation are: (i) the use of simplifying approximations and assumptions in modeling the real systems or processes, and (ii) the fidelity and validity of the simulation results. Traditionally, the essence of simulation is the use of mathematical models to emulate real systems. This approach yields analytical solutions that enable the prediction of system behaviors from a set of parameters and initial conditions. Its effectiveness is nevertheless limited to simple systems that have closed-form analytic solutions. Alternatively, computer simulation is to perform simulation utilizing computer-based models. Because of their ever-increasing computing power, performing simulations on computers is inevitably the preferred approach for the studies of complex systems for which closed-form analytic solutions are difficult or not possible. Computer simulation offers another distinct advantage in terms of its flexibility and efficiency in emulating complex physical systems over a wide range of parameter values and initial conditions. This guide focuses on the basic elements that are essential for running circuit simulations in Multisim. The users should consult the Multisim online help file for the detailed descriptions of various aspects of Multisim simulations. 2.6.1 Simulation in Multisim Running simulations in Multisim is essentially emulating the behavior of electric, digital, or electronic circuits on a computer. By virtue of these simulations, one can gain understanding of the performance of various circuits prior to using physical test instruments or their physical constructions. The key issues of running a circuit simulation include: Setting up the circuit for simulation Selecting the virtual instruments Selecting the mode of simulation Analyzing the results

The tools available in Multisim pertinent to circuit simulations can be accessed via the Menu bar. Specifically, a click on the Simulation button reveals a drop-down menu containing a list of simulation commands as depicted in Figure 2.6.1.

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2‐51 

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2‐52 

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2‐54 

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2‐55 

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2‐56 

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2‐57 

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2‐58 

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VIS II – An Intr

2‐59 

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2‐60 

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2‐61 

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2‐62 

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2‐63 

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(d) Function Generator Controls The two control knobs are identified and described as follows:

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voltage, current, resistance, and diode measurements. Current Banana Jack (red) is used to provide the positive input for DMM current measurements.

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EEL3003L NI Multisim and ELVIS II – An Introductory Guide EEL3112L

3-15  

In summary, the NI ELVIS II platform offers some rather attractive features, which are listed in the following: Open architecture for third-party plug-in boards High-speed USB plug-and-play connectivity High sampling rate supported by 1.25-MHz oscilloscope with the 100-MHz option on NI ELVIS II Isolated digital multimeter capable of making accurate measurements (over 5 digits) Access to power supplies at ±15 V and +5 V Manual-mode control available for function generator and variable power supply Solid-state circuit protection on all I/O lines

3.3 NI ELVISmx Software NI ELVISmx is the software that supports NI ELVIS II hardware.  It is created in LabVIEW to fully take advantage of the capabilities of virtual instrumentation. The software includes soft-front-panel instruments, LabVIEW Express VIs, and SignalExpress blocks to empower the utilization of the NI ELVIS II hardware via programming. NI ELVISmx provides twelve LabVIEW soft front panels (SFPs) listed below: Arbitrary waveform generator (ARB) Bode analyzer (Bode) Digital reader (DigIn) Digital writer (DigOut Digital multimeter (DMM) Dynamic signal analyzer (DSA) Function generator (FGEN) Impedance analyzer (Imped) Oscilloscope (Scope) Two-wire current voltage analyzer (2-wire) Three-wire current voltage analyzer (3-wire) Variable power supplies (VPS)

One may recognize that these virtual instruments are necessary in typical laboratory applications. The following discussion briefly describes how to incorporate the SFP instruments into NI ELVIS II. The users are encouraged to consult the NI ELVISmx help file for more detailed explanation of these SFP instruments and the instructions for their operations.

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EEL3003L NI Multisim and ELVIS II – An Introductory Guide EEL3112L

3-25  

Channel 0 Settings The settings for channel 0 involve the following elements: Source: selecting the signal source for the measurement on channel 0. The options are: (i) Using the SCOPE CH 0 BNC connector on the control panel. (ii) Using the analog input channels AI0, AI1,, AI7 available on the NI ELVIS prototyping

board. Enabled: specifying whether to enable data acquisition on channel 0. If checked, data acquisition is

enabled. If unchecked, data acquisition is disabled. Probe: selecting the probe value 1x or 10x for channel 0. The default value is 1x. Coupling: specifying the coupling for the channel. This operation is done in the software. One can

select AC (to remove the DC offset from the signal) or DC (to measure the entire signal). The default value is DC.

Scale VoltsDiv: selecting the vertical sensitivity for the trace of channel 0. The units are in volts/division. The default is 1 voltdiv.

Vertical Position: controlling the vertical positioning of the waveforms acquired via channel 0 by applying a positive or negative vertical offset. The default is zero offset. The offset is referenced from the zero point of the graph. This offset value is not applied to the actual acquired data.

Channel 1 Settings The settings for channel 1 involve the following elements: Source: selecting the signal source for the measurement on channel 1. The options are: (i) Using the SCOPE CH 1 BNC connector on the control panel. (ii) Using the analog input channels AI0, AI1,, AI7 available on the NI ELVIS prototyping

board. Enabled: specifying whether to enable data acquisition on channel 1. If checked, data acquisition is

enabled. If unchecked, data acquisition is disabled. Probe: selecting the probe value 1x or 10x for channel 1. The default value is 1x. Coupling: specifying the coupling for the channel. This operation is done in the software. One can

select AC (to remove the DC offset from the signal) or DC (to measure the entire signal). The default value is DC.

Scale VoltsDiv: selecting the vertical sensitivity for the trace of channel 1. The units are in volts/division. The default is 1 voltdiv.

Vertical Position: controlling the vertical positioning of the waveforms acquired via channel 1 by applying a positive or negative vertical offset. The default is zero offset. The offset is referenced from the zero point of the graph. This offset value is not applied to the actual acquired data.

EEL3003L NI Multisim and ELVIS II – An Introductory Guide EEL3112L

3-26  

Timebase The parameter TimeDiv determines the horizontal time scale in units of seconds/division. The default value is 5 ms/division. Trigger The pertinent settings involve the following elements: Type: specifying the type of trigger to start the acquisition. The three options are as follows: (i) Immediate: There is no external signal that triggers the acquisition, meaning the acquisition

begins immediately. (ii) Digital: A digital trigger occurs on either a rising edge or falling edge of a digital signal. One

can specify the Slope as either positive (on the rising edge) or negative (on the falling edge) to the trigger. When digital triggering is chosen, the trigger source control is set to TRIG.

(iii) Edge: An edge trigger occurs when a signal crosses a trigger threshold that one specifies in the Level (V) control. One can specify the Slope as either positive (on the rising edge) or negative (on the falling edge) to the trigger. When edge triggering is chosen, the trigger source control can be set to Chan 0 Source or Chan 1 Source.

Note: The type by default is Immediate. Source: specifying the source for the external start trigger for the oscilloscope data acquisition. In

this instance, the options are as follows: (i) TRIG: The trigger source is the TRIG input on the NI ELVIS II benchtop workstation. (ii) Chan 0 Source: The trigger source is the channel specified by the Channel 0 Source control. (iii) Chan 1 Source: The trigger source is the channel specified by the Channel 1 Source control. Slope: determining whether to trigger off a positive or negative slope. For digital triggers, a

leading edge has positive slope and a falling edge has negative slope. For analog triggers, a rising slope is positive and a falling slope is negative. The default is positive slope.

Level (V): specifying the voltage at which a trigger occurs. This parameter is only valid when Type is set to Edge. The default is 0 volt.

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EEL3003L NI Multisim and ELVIS II – An Introductory Guide EEL3112L

3-40  

How to Use Variable Power Supplies SFP One may follow the steps below to output a voltage with the variable power supplies SFP: Connect the variable power supplies Supply and Supply signals on the NI ELVIS II prototyping

board to the location where they are needed. These are independent power supplies, and both signals are referenced to the GROUND signal.

Launch the variable power supplies SFP from the NI ELVISmx instrument launcher using the click command sequence:

  Simulate >> Instruments >> NI ELVISmx Instruments >> NI ELVISmx Variable Power Supply 

 Click on the Run button to activate the power supplies. The output voltage is 0V when initially launched.

Enter the desired voltage for each supply using the voltage adjustment control and the output voltages are then updated accordingly.