Introduction to NI-ELVIS Environment - Engineering Assignment Help

Assignment Task

Objectives:

The purpose of this laboratory is to provide an introduction to the NI-ELVIS design and prototyping environment. Basic operations provided by ELVIS like the Digital Multimeter (DMM), function generator, oscilloscope and bode analyzer are explained. Passive RC high pass and active low pass filter circuits are characterized using NI-ELVIS.

List of Equipment required:

st of Equipment required:
1. NI-ELVIS benchtop workspace, incl. Digital Multimeter Soft Panel Instrument (SFP), Function Generator SFP, Oscilloscope SFP, and Bode Analyzer SFP.
2. Resistors: different values.
3. Capacitors: different values.
4. Op-amps: we will use the TL072

Introduction:

DAQ (data acquisition) systems capture, measure, and analyze physical phenomena from the real world.

Light, temperature, pressure, and torque are examples of the different types of signals that a DAQ system can measure.

Data acquisition is the process of collecting and measuring electrical signals from sensors and test probes, and sending them to a computer for processing.

Data acquisition may also include the output of analog or digital control signals.

Virtual Instrumentation is defined as the combination of measurement and control hardware and application software with industry-standard computer technology to create user-defined instrumentation systems.

Virtual Instrumentation provides an ideal platform for developing instructional curriculum and conducting scientific research.

Tools must be flexible and adaptable, both in instructional labs, where experiments combine measurement, automation, and control, but also in research environments, where the needs are unpredictable.

Modularity, and hence new functionality, and economy are important attributes.

The National Instruments Educational Laboratory Virtual Instrumentation Suite (NI ELVIS) is a LabVIEW and computer based design and prototyping environment. NI-ELVIS consists of a custom-designed bench top workstation, a prototyping board, a multifunction data acquisition device, and LabVIEW based virtual instruments. This combination provides an integrated, modular instrumentation platform that has comparable functionality to the DMM, Oscilloscope, Function Generator, and Power Supply found on the laboratory workbench. By this time, you are familiar with ELVIs, having read the files and watched the videos.

As an introduction to use the ELVIS workspace environment, we will complete the following tasks:
Part A. Using Digital Multimeter Soft Panel (SFP) to measure electronic component properties.
Part B. Using Function Generator SFP & Oscilloscope SFP for characterizing a RC high pass filter.
Part C. Using Bode Analyzer SFP for characterizing an active high pass filter. 

Part A. Measuring Component Values using NI Elvis Digital Multimeter
Complete the following steps to measure the value of a 1K? resistor using NI-ELVIS.
1. First ensure that the Power Supply to the prototype board has been switched off. (Refer to figure 2). Note that the system power is switched on. The system power switch is located at the back of the prototyping station. 

2. Insert the resistor on the prototype board.

3. Connect the two terminals of the resistor between V and COM terminals with banana jack connections (refer to figure 4) on the proto board as shown in figure 3.

4. Connect the two terminals of a 47nF capacitor between DUT+ and DUT- terminals (refer to figure 6) on the protoboard as shown in figure 5

5. Apply power to the proto board by switching the Prototype Board Power switch to the up position. The three indicator LEDs +15V, -15V and +5V should now be lit.

6. Launch the Instrument Launcher program. An interface that shows all the Virtual Soft Front Panels (SFP) available in NI-ElVIS should appear (appearance differs in the 2 versions of ELVIS).

7. Click on the Digital Multimeter(DMM). This SFP can be used for a variety of operations.

8. Click the Ohm button to use the Digital Voltmeter function (DMM-Ohm) to measure the value of the resistor. If the Function Generator is in manual mode, the resistance and capacitance buttons are disabled. In order to control these buttons using the SFP, ensure that the manual mode is turned off on the workstation. Once the measurement is successful the output should appear as shown in the figure on the right (Fig 7).

9. Click the Capacitance button to use the Digital Capacitance Meter function to measure the value of the capacitance. Once the measurement is successful the output should appear as show in figure 8 on the right.

Part B. Analog RC Filter Analysis using Function Generator and oscilloscope

This section provides an introduction to using NI-ELVIS for AC characterization of a simple RC high pass filter.

For the high-pass filter shown below, with R and C values should be the same as used in the previous part.

1. Find the transfer function ????0 ???????????? , and compute the pole location ωc.

2. Draw the Bode plot (mag and phase in matlab) Use >> bode (num,den)

1. Ensure that the Prototype Board Power is switched off.

2. Connect the RC filter circuit on the proto board as shown in figure above, but interchanging the capacitor and resistor (the figure above is for a low-pass filter, not the one we have designed.)

3. The input signal for the filter is obtained between 'FUNC OUT' & 'GROUND' pins. The input signal is also connected to Analog Channel-0 (between AI1+/AI1-) and the output signal across the capacitor is connected to Analog Channel-1 (AI0+/AI0-). Connections on the Analog Channels 0 and 1 are used for oscilloscope SFP as further explained in the below steps.

4. Apply power to the proto board by switching the Prototype Board Power switch to the up position.

5. From NI-ELVIS instrument launcher, click on "Function Generator" (FGEN). Ensure that the manual mode is turned off on the workstation so that all the buttons on the function generator window are not disabled. The initial function generator should appear as shown in figure 11 on the right.

6. As shown in the figure, FGEN SFP has the following controls which can be used to: a. Set the Frequency. b. Select the waveform type (Sine, Square or Triangular). c. Select the waveform amplitude (Peak), and d. Select the DC offset of the waveform.

7. Use these settings to obtain a 20kHz sine wave with peak amplitude of 1 V and DC offset of 0 V. Note that this signal will be applied to the RC high pass filter.

8. From the instrument launcher, click on "Scope". The oscilloscope SFP is similar to most oscilloscopes, but NI Elvis oscilloscope can automatically connect to variety of inputs.

9. Recall the input to the RC circuit is connected to FUNC_OUT port on the prototype board. This input is also connected the Analog Channel-0 (AI1+/AI1-). Hence select AI1 in the source pull down list.

10. This input signal originates from FUNC_OUT. The corresponding SYNC signal is TRIG. Hence under in TRIGGER section, select TRIG option. The output should now appear as shown in figure below (of course, your numerical values are different). This is the input signal for our RC circuit.

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