Lab 4: Introduction to ELVIS II+ Introduction to ELVIS II+

Transcription

1 Page 1 of 12 Laboratory Goals Introduction to ELVIS Lab 4: Introduction to ELVIS Familiarize students with the National Instruments hardware ELVIS Identify the capabilities of ELVIS Make use of the built in variable power supply Make use of the built in function generator Record results in the laboratory notebook Pre-lab / lab reading ELVIS instruction manual Course Textbook Manual for ELVIS : or 14BA0 See for ELVIS resources. Review the Tutorials, Getting Started Guide for NI ELVIS II/, Top 10 Instruments for NI ELVIS II Series and NI mydaq, Lesson 1 NI ELVIS II Workspace Environment From the link: Equipment needed Lab notebook, pen Latest version of NI ELVIS and ELVIS Drivers loaded on lab computers Dell Computer with Windows 7 Enterprise and LabVIEW 2012 Parts needed Jumper wires Lab safety concerns Do not make voltage measurements while the multimeter is set for current measurements-you will blow the current limiting fuse! Do not turn on the power supply until you have rechecked your circuit for correct wiring Do not allow the test leads connected to the power supply to touch each other National Instruments ELVIS Series Hardware NI ELVIS II Series combines hardware and software into one complete laboratory suite. The system consists of an independent computer running a version of Microsoft Windows XP (or later), an USB cable to the ELVIS Workstation equipped with the ELVIS II series prototyping board, and an AC/DC power supply. See Figure 1, Typical System and Figure 2, Prototyping Board below:

2 Page 2 of 12 Lab 4: Introduction to ELVIS Fig 1(above): Typical ELVIS System Fig 2(below) Prototyping Board

3 Page 3 of 12 Lab 4: Introduction to ELVIS Fig 3(above): View of ELVIS Fig 4 (below) Controls & Functions

4 Page 4 of 12 Lab 4: Introduction to ELVIS Goal These exercises introduce the NI ELVIS workstation and demonstrate how you can measure electronic component properties. You can build circuits on the prototyping board and later analyze them with the NI ELVIS software instruments or independent instruments. General The circuit development process begins with a need for a product or service. This need is recorded as a concept in a concept document. The concept is then formalized into an accomplishable set of requirements. The requirements document is used to develop the design that will meet the requirements. The design is first tested using circuit simulation. The simulations help with understanding the interaction of the various parts used in the design. The electronic parts values and tolerances can be estimated. Once the simulation is complete, the circuit can be constructed with actual, physical devices on a prototyping board were measurements can be made to verify the simulations and determine if any issues arise that the simulation models didn t illustrate. The Educational Laboratory Virtual Instrumentation Suite, ELVIS, is a system that delivers hands-on lab experience with an integrated suite of more than 12 of the most commonly used instruments in one compact form factor. It includes a two channel, 100 Ms/S oscilloscope; digital multimeter; function generator; dual output(+12v & -12V), variable power supply; three output (+15V, -15V, +5), fixed power supply; and a Bode analyzer. Software Front Panels Used in this Lab This lab exercise requires the following SFP (Software Instruments) 1. Digital Ohmmeter on the DMM [Ω 2. Digital Capacitance Meter on the DMM [C] 3. Digital Inductance Meter on the DMM [C] 4. Digital Voltmeter on the DMM [V] Components Used in this Lab This lab exercise requires the following components: kω resistor, R1 (brown, black, red) or closest available kΩ resistor, R2 (red, red, red) or closest available MΩ resistor, R3 (brown, black, green) or closest available 4. 1 μf capacitor, C or closest available 5. 5 unknown resistors 6. 1 inductor of any milli-henrys value Exercise 1: Measuring Component Values Complete the following steps to measure component s electrical values: 1. Turn on the ELVIS power switch. See Fig 5.

5 Page 5 of 12 Lab 4: Introduction to ELVIS Figure 5: Power Switch Location. When the power switch (1) is turned on, the computer should recognize the ELVIS and produce this message in the lower right of the screen. See Figure 6: Figure 6: ELVIS Detection Message. Clicking the message produces the following window. See Figure 7. Figure 7: ELVIS Start Message With the highlighted task selected, click OK. This action will produce the following window, Figure 8a & b: Newer Version or Figure 8c: Older Versions.

6 Page 6 of 12 Lab 4: Introduction to ELVIS Figure 8a: ELVIS Instrument Launcher (New Version) Figure 8b: ELVIS Instrument Launcher (New Version) Manual Link Figure 8c: ELVIS Instrument Launcher (Older Version)

7 Page 7 of 12 Lab 4: Introduction to ELVIS Figure 8a shows the Instruments Tab with icons for the various instruments available utilizing the hardware and software of the ELVIS. Within the ELVIS, there are A/Ds, Analog to Digital Converters; D/A, Digital to Analog Converters; Digital Inputs, Digital Outputs, and Power Supplies. The software within the PC requests the data needed for the selected measurement from the ELVIS. It then properly formats this data for presentation to the user. Figure 8b has a link to display the ELVIS User s Manual on the Resources Tab. Figure 8c is the Instrument Launcher used in older versions of the ELVIS software. It is always good to review an instrument s user manual to gain insight into how to most efficiently and effectively to use the instrument. This should be done for all the instruments and equipment we use in this course. Most, if not all manuals can be found online at the manufacturer s website. 2. Connect two banana-type leads (black lines) to the DMM current inputs on the workstation front panel. See item 3 of Figure The other end of the banana-type leads are connected to the Banana A and Banana B connectors by printed circuit lands (indicated by white lines) on the prototyping board. See item 11 of Figure 2. These connections are shown here in Figure 9. Figure 9: Connections of Banana Leads to DMM

8 Page 8 of 12 Lab 4: Introduction to ELVIS The black lines indicate where the banana leads connect and the white lines indicate which places on the prototype board are connected to the banana leads. The ends of the resistor should be connected with one lead in row 38 and the other end in row Launch the ELVIS DMM by clicking on the Digital Multimeter on the ELVIS Instrument Launcher (Figure 8a). This will open the DMM window, Figure 10. a. Click button marked Ω, Ohms (#5) b. Select Auto for the Mode (#11) c. Leave Null Offset unchecked (#13) d. Leave Device on Dev 1 (#15) e. Leave Acquisition Mode on Run Continuously (#16) Figure 10 ELVIS Digital Multimeter 5. Measure the resistors R1, R2, and R3 by a. inserting one of the resistor s lead into row 38 and the other lead into row 39 and b. click Run (#17) and after a reading appears in the display click Stop (#18) c. Record the values in your lab notebooks. i. R1 Ω (1.0 kω nominal) ii. R2 Ω (2.2 kω nominal) iii. R3 Ω (1.0 MΩ nominal) 6. Take the five unknown resistors and tape them to a sheet of paper with your name at the top and measure them as follows: a. Determine the nominal value with the color code and write this next to the resistor. (Black=0, Brown=1, Red=2, Orange=3, Yellow=4, Green=5, Blue=6, Violet=7, Gray=8, White9 and Silver=10%, Gold=5%.) b. Remove the Banana Leads from the Banana Jacks on the Prototype board c. Leave the other ends connected to the DMM

9 Lab 4: Introduction to ELVIS Page 9 of 12 d. Click Run e. Touch the banana lead connected to the red DMM jack to one resistor lead and the banana lead connected to the black DMM jack to the other resistor lead. f. Read the resistance measurement from the display and record it next to the resistor and record in your lab notebook. g. Repeat for each unknown resistor. h. To the T/A, give the paper on which the resistors are taped. 7. Next we will measure the actual capacitance of the 1 μf Capacitor. a. Click the Capacitance measurement button - #6, Figure 10 b. Note that the connection diagram (#14, Figure 10) now indicates that the capacitor must be connected between Row 29, DUT+, and Row 30, DUT-, of the Lower P2 Terminal Strips on the Prototype Board, just up from the banana lead terminals see Figure 11. Figure 11 Capacitor/Inductor Test Connections c. Turn ON the Prototyping board power supply with the switch in the upper right of the ELVIS (#8 of Figure 4). d. Connect the Capacitor with the positive lead in Row 29, DUT+ and the negative lead in Row 30, DUT-. Note the polarity of the Capacitor, Figure 11b: Polarized Capacitor. Figure 11b: Polarized Capacitor with negative lead marked with Minus Sign and being the shorter lead e. Set the Acquisition Mode to Run Once f. Record the reading from the display in your lab notebook. i. C μf (1 μf nominal) g. Turn OFF the Prototyping board power supply with the switch in the upper right of the ELVIS (#8 of Figure 4). h. i. Remove the capacitor from the Prototype board. 8. Now we will measure an Inductor a. Click the inductor measurement button (#7 on Figure 10).

10 Lab 4: Introduction to ELVIS Page 10 of 12 b. The highlighted inductor button will be the only change in the DMM window. c. Connect the inductor with one lead in Row 29, DUT+ and one lead in Row 30, DUTd. Turn ON the Prototyping board power supply with the switch in the upper right of the ELVIS (#8 of Figure 4). DO NOT remove the inductor while this power supply is ON. e. Click the Run button and Record the measurement in your lab notebook. f. Record the value marked on the inductor case in your lab notebook. g. Turn OFF the Prototyping board power supply with the switch in the upper right of the ELVIS (#8 of Figure 4). End of Exercise 1 Exercise 2: Voltage Measurements 1. On the Prototype board, locate a clear area and connect R1 (1kΩ) and R2 (2.2 kω) in series. See Figure 12. Figure 12: Series Resistor Network connected to DMM 2. Connect the top of R1 to the ELVIS s +5 Volts Power Supply in the lower left of the Prototype Board. See Items 7 & 8 on Figure Connect the bottom lead of R1 to the top lead of R2 and the bottom of R2 to the ground of the ELVIS s +5 Volt Power Supply see Items 7 & 8 of Figure Double check all connections for correctness and when correct. 5. Turn ON the Prototyping board power supply with the switch in the upper right of the ELVIS (#8 of Figure 4). 6. Calculate the expected V1 voltage from the voltage divider equation: V1 = Vs ( R2/(R1 + R2)) The measured values of Vs, R1, & R2 should be used since the measurements are on the actual components and not ideal components. (This should always be done) 7. Set the DMM Acquisition Mode to Run Continuously

11 Lab 4: Introduction to ELVIS Page 11 of Measure the voltages at Vs and V1. a. Click the DC Voltage button on the DMM window (#1, Figure 10) b. Connect the other end of the banana lead from the black DMM jack to the circuit ground and the other end of the banana lead from the red DMM jack to Vs and record the reading in your lab notebook. i. Vs = VDC. c. Leave the banana lead connected to the ground in place and move the banana lead on Vs to V1. d. Record the V1 voltage in your lab notebook. i. V1 = VDC. 9. Turn OFF the Prototyping board power supply with the switch in the upper right of the ELVIS (#8 of Figure 4). End of Exercise 2 Exercise 3 Current Measurement 1. Calculate the expected Current for the two resistor, series circuit of Figure 12 using the equation: I = V/Rt where Rt = R1 + R2 and record the expected value in your lab notebook. 2. Using the circuit from the previous exercise 2, remove the wire connecting bottom of R2 to the Ground of the +5 Volt power supply. 3. Click the Amps DC button on the DMM (#3 of Fig 10) and note the change in the Banana Jack Connections illustrated in the DMM window (#14 of Fig 10). See Figure 13, and make the Acquisition Mode Run Continuously. Figure 13 DMM Current Measurement Connections 4. Connect the DMM to the bottom of R2 to the DMM red A jack. 5. Connect the Ground of the Power Supply (Row 53) to the DMM black COM jack. 6. Triple check the connections. If the connections are incorrect you may damage the power supply or blow (melt) the DMM fuse. 10. When sure the connections are correct, turn ON the Prototyping board power supply with the switch in the upper right of the ELVIS (#8 of Figure 4). 11. Click the Run button on the DMM window and read the current from the display. Record the reading in your lab notebook next to the calculated value. a. I (Calculated) ma b. I (measured) ma 12. Turn OFF the Prototyping board power supply with the switch in the upper right of the ELVIS (#8 of Figure 4). 13. Turn OFF the ELVIS Power Supply with the power switch #1 of figure 5.

12 Lab 4: Introduction to ELVIS Page 12 of Return all leads to their proper place in the cabinets. 15. Give Sheet of paper with name and 5 unknown resistor (now properly classified and measured) to the Instructor or TA. 16. Return all components to their proper drawer in the component drawers. End of Exercise 3 Report Tips: 1. Explain how to use the ELVIS DMM and how the connection points change depending on the type of measurements. 2. Always measure all circuit components for their actual values 3. Always measure all power sources for their actual values 4. Always use the measured component and source values to calculate expected values. 5. Compare the expected results to the measured results, give the error in both absolute and percentage error, and explain any errors larger than 5 to 10 %. 7. Try to say something nice about the help from the TA of the Lab ;-) Lab Procedure was written/updated by David Modisette on to reflect changing from the ELVIS to the ELVIS and added inductance measurement.