Introduction to Laboratory Equipment - Experiment 1 | ECE 2274, Lab Reports of Electrical and Electronics Engineering

Download Introduction to Laboratory Equipment - Experiment 1 | ECE 2274 and more Lab Reports Electrical and Electronics Engineering in PDF only on Docsity! EE 2274 Pre-Lab Experiment # 1 Introduction to Laboratory Equipment Completed Prior to Coming to Lab Lab Use Whittemore 251, 253, and 219 are similarly equipped. You may use the labs M-F from 8am to 4:30pm or anytime your instructor allows to use the lab, (as long as the lab instructor is with you and it does not interfere with other labs). These times can be used to make-up labs or to become more familiar with the lab experiments/equipment. Friday is normally the best day to make-up a lab because no scheduled labs are going on Friday. If you can’t find your regular TA, come by 234 Whittemore and someone will help you. We would prefer your regular lab instructor sign you a lab use form if possible however, we understand sometimes it’s hard to locate people. In those cases come by 234 Whittemore, and we will get you in the lab. Once in the lab, you are not to let anyone else in the lab. Folks in 234 will be glad to help you with the lab. Your grade for the make-up lab is up to your regular lab instructor. Please observe the lab schedule posted on the door so as to not interfere with other scheduled labs. You must vacate the lab by 4:30pm M-F, unless an instructor is present. Any violations of these procedures will result in access being denied except during your regularly scheduled lab sessions. Personal Safety The following safety comments apply to all laboratory courses: 1. If more than 50V are to be used in the work, at least two other people must be present in the lab, including an instructor. 2. Always wire a circuit completely before connecting it to the power source. This will avoid the handling of energized wires. Review the wiring to avoid damage to components due to accidentally misplacing the wire in the circuit. Furthermore, always disconnect the source end of a wire before disconnecting a wire from a circuit. 3. Provide a switch within easy access with which the circuit can be de-energized. Turning off a power supply while the circuit is still connected to it can damage components as current and/or voltage spikes can occur as the supply turns off. Equipment Protection The electronics labs in Whittemore are some of the most sophisticated labs available at any university. Therefore, a great deal of care should be used while handling the equipment. 1. At the end of a lab session, turn off all pieces of equipment. Turn off the bench power. Be sure that any battery-powered equipment, such as the resistance and capacitance meters, are turned off. 2. Hang leads properly and leave your bench area in neat order. Return full connector boxes to the storage cabinet. 3. Do not remove any equipment from a bench. Faulty equipment will be replaced by the Lab Repair Service within minutes. 4. Do not write on or mark the instrument panels. 5. No food or drink is allowed in the labs. The appearance of the labs is very important. During time of inclement weather make sure that your shoes and apparel are free of mud and snow before entering one of the labs. Do not prop feet or place wet articles on benches or equipment. Coats and book bags should be placed on tables used for this purpose and not on the bench tops. Exercises 1. Read “XYZ’s of Oscilloscope” Primer (omit pages 20,23,24,25,26,32,44,45,46, and 47)(omit Probes p.33 thru p.36) Do problems 1 through 17 from “XYZ’s of Oscilloscope” Primer page 51 Written Exercise. Also, do the Exercise 1 through 6 on page 52. Familiarize yourself with the front panel and display of the oscilloscope using the figures below. 3. What is the color code of a 47kΩ resistor? You may use the resistor color code guide shown below. 4. Familiarize yourself with the protoboard layout as shown below. Protoboard Bus Layout Pre-Lab Answer Sheet For exercises from “XYZ of Oscilloscope” Experiment # 1 Introduction to Laboratory Equipment 1. Acquisition ____________ 2. Analog ____________ 3. Bandwidth ____________ 4. Digital Phosphor ____________ 5. Frequency ____________ 6. Glitch ____________ 7. Period ____________ 8. Phase ____________ 9. Pulse ____________ 10. Waveform Point ____________ 11. Rise Time ____________ 12. Sample Point ____________ 13. Digital Storage ____________ 14. Time Base ____________ 15. Transient ____________ 16. ADC Resolution ____________ 17. Volt ____________ 1. ____________ 2. ____________ 3. ____________ 4. ____________ 5. ____________ 6. ____________ 9. Connect the Fluke 45 digital multimeter, set on DC milliamps, in series with the circuit of Step 2. Measure the current through this circuit and compare it to the calculated value of Step 2. Note: You must move the meter leads to the current sense input. Also, keep in mind that the high and low current sense inputs are not the same. Part III – DC versus AC coupling 10. Connect leads from the positive 25V terminals of the Agilent E3631A to channel 1 of the oscilloscope. The banana-jack to coax adapter has a tab to indicate which side is common. Set the supply on the Agilent to read 5V. a. Using the “1” key and the softkeys, make sure the coupling on channel 1 of the oscilloscope is set on DC coupling. What is the amplitude of the signal on the scope? b. Change the coupling from DC to AC. What happens to the signal? Why? 11. Using the Agilent 33120A function generator, generate a 1kHz sine wave with a peak-to-peak amplitude of 4V and a DC offset of +1V. Connect the output of the function generator to the scope and observe the waveform. The scope should still be on AC coupling. a. Now change the amplitude of the DC offset to 2V. What happens to the signal? Why? b. Now change the scope to DC coupling. What happened to the signal? What happens when you vary the DC offset? Why? Part IV – Capturing the Scopes Waveform 12. Performing the waveform capture procedure. a. Display a 2VPP, 1 kHz sinusoid on Channel 1 of the scope using 500mV/div and 200µs/div. b. In the Lab Workbench software, go to the oscilloscope selection. Select the Capture Settings option under the Control Method menu item. Then click on the acquired waveform button. The waveform should appear on the screen. If the waveform is acceptable, save it to the buffer. The buffer is a feature that allows you to save waveforms temporarily. Remember to title your graphs and label the X and Y axes. When you are given the option save to disk now or later, choose later. Saving now results in the graph being saved as a text file with raw data instead of as a jpeg with the picture of the graph. c. After saving the waveform to the buffer, click on the Return to Main Menu button and then go to the buffer utility. The waveform you just acquired should be available in the list of file names on the left side of the screen. You can select up to three waveforms to display using the menu bars next to the displays. If the graph is acceptable, then save it to disk using the File Options menu bar. Saving the file as text file will result in the information being stored as raw data. Saving the file as a jpeg creates a picture of the graph in jpeg format. 13. Repeat this procedure for a 4VPP, 5 kHz triangular wave on Channel 2 and a 5VPP, 10 kHz square wave on Channel 1. Adjust the oscilloscope’s horizontal and vertical controls as needed to obtain a waveform between 1 and 2 periods long. 14. Measure and validate the frequency and peak-to-peak amplitude of the three waveforms from the screen graph. Find the error introduced in the frequency measurement and the error measurement. To determine how much error is introduced by the measurement, use the percent error formula: Data Sheet Experiment # 1 Introduction to Laboratory Equipment Part I – Basic operation of the Agilent digital storage oscilloscope 1. Configure the scope 2. Type: ____________ Frequency ____________ Amplitude: ____________ 3. Do they agree? 4. Amplitude: ____________ Frequency: ____________ 5. Amplitude ____________ Frequency ____________ Part II – Using the DC Voltage Supply and the Agilent and Fluke Multimeters 6. Rmeasured = ____________ 7. Vmeasured = ____________ 8. Icalculated = ____________ 9. Imeasured= ____________ Part III – DC versus AC coupling 10. Output signal of scope: What happens to the signal when changed from DC to AC coupling? Why? 11. What happens to the signal when changing the DC offset? Why?