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PROCEDURE FOR WRITING LABORATORY REPORTS: Electrical-Electronic Principles At this stage in your educational experience you are asked to prepare a technical report similar to the method that will be expected of you in industry. Therefore you are asked to use the following framework when preparing your laboratory reports: Type all reports, using a title page with the name of the report, your name, and date of experiment. This should be a single document that contains the following EET Lab number and your name. 1. All Laboratory Reports must include the following topics: a. Objective-Be specific about the theory you will prove. No more than a couple of sentences to describe what you hope to prove in the experiment. It is NOT ACCEPTABLE to say "I hope to learn how something works" or "I will study or measure..." b. List the equipment and components used in the experiment. c. Circuit Operation - Discuss how the circuit is supposed to operate. What is the theory involved? Be specific! d. Calculations - Explain what and why equations were used; show sample calculations. Indicate where the results are recorded, i.e. Table 1. Relate the theory in your text to the actual circuit. All calculations and measured data, step e below, should be placed in a Data Table. (Use a spreadsheet or word processor table function.) e. Procedure - in your own words, using English Prose, explain how you conducted the experiment, the procedure that was followed while wiring the circuit and taking measurements. Be specific. Indicate how results were obtained. Refer to results that are recorded in Table(s). REMEMBER YOU ARE NOT WRITING A COOKBOOK! THIS IS A TECHNICAL LABORATORY REPORT! (Do not copy from the lab handout) f. Draw the schematic - Use MultiSim circuit analysis software. A pictorial wiring diagram can also be included. g. Observations - discuss what you observed as measurements were conducted. Did the circuit behave as expected? If you use an oscilloscope to make a measurement it is good practice to make a sketch of the waveform. h. Graphs - if necessary include a graph to describe the results. Recording your data using a spreadsheet program facilitates creating graphs. i. Conclusion - the report is not complete without a conclusion. Relate the results of the experiment to the objective. Did you prove your objective or not. Why or why not? Did you have any problems carrying out the experiment? The conclusion is one of the most important parts of the experiment. You are making rational deductions from the data you collected in the experiment. 2. Please follow the above procedure when preparing your reports. With the majority of our experiments the reports should be no more than four typed pages plus schematics and tables and equations, unless you find reason to exceed that length. If you have any questions, please feel free to see me. Remember, these reports are an important part of your grade (20%)!!! Reports are due one week after completing the experiment. (For late reports, 5 points are deducted per week.) Grading is based on Content, Explanation of Ideas, Organization, Inclusion of Topics above and timeliness; refer to the Rubric. Need more help? See the web sites below: http://www.bu.edu/eng/departments/me/general-resources-students/current-undergraduate-students/lab-report- format//n ALDE 2 Home SysRq ELECTRICAL ELECTRONIC PRINCIPLES: LAB#1 OHM'S LAW TTU EQUIPMENT: 1-2200 2 resistor, 15k resistor 2-Digital multimeter (ammeter and voltmeter) 1-Variable DC power supply with voltage display 1-Prototype board F11 PROCEDURE: F12 Note: In this laboratory you will become better acquainted with the procedures and equipment associated with laboratory experiments, so do not rush. Do not let one individual in the lab group make all the measurements or wire all circuits. Each student must become comfortable with the process if you expect to perform your future job function in a professional manner. Read the instruments carefully. The more accurate a reading, the more accurate the results obtained. One final word of caution: Safety First! For obvious safety reasons, even though these experiments use low voltages and currents, do not End PrntScrn make circuit changes with the circuit energized. (Turn power off!!) If you have any questions about the procedure, be sure to contact your instructor. ******DO YOUR CALCULATIONS FIRST!!!****** 1. Using the circuit in figure 1, using Ohm's Law calculate the values of current, given the fixed value of resistance, for each voltage given in Table 1. Use the nominal value of the resistors. 2. Measure the value of your resistors. This will give you an indication of how much tolerance to expect in the circuit. Think about what parameters can vary in this circuit. 3. First, set up the circuit in figure 1. Use the meter on the DC power supply to measure the source voltage. Use the DMM to measure the current. Use the other DMM to measure the voltage drop across the resistor. Set the voltage to the appropriate values in Table 1, then measure the current. Continue to change the voltage and measure the current for each particular voltage value in Table 1. Note: When you wire the circuit the Ammeter must be in series and the voltmeter must be parallel with the source voltage. Red banana plug from power supply to resistor; other side of resistor to + red side of ammeter; - black side of ammeter to ground-black of power supply. 4. Substitute the 15K 2 resistor for the 2.2k and repeat the experiment. 5. Generate 2 graphs, one for measured and one for calculated amounts. Graph the value of measured current vs. voltage for the values in Table 1 using both the 2.2k and 15k resistor measurements on one graph. What can you conclude from the slope of the lines? 6. In your laboratory report think about the following: do your measurements match the calculated values? Why or why not? What contributed to the errors? What does Ohm's Law predict? Did you make any other observations about the use of equipment? Remember, writing the lab report should be an exercise to explain, thoroughly what happened and why. Insert Pause Delete Pa D F4 4 F5 E: If F6 SOURCE VOLTAGE (E) 2 4 6 8 10 2 VOLTAGE (E) 4 6 Variable Voltage Source -CALCULATED VALUES- F8 grawbd RESISTANCE* (R) 212K 2,2K 212K F9 2,2K 211918 -V1 -10 V CALCULATED VALUES- 15 K 15 к TABLE 1 (2.2K2) Color Code red, red red RESISTANCE* (R) 15 K 15k 15K F10 RK CURRENT (1) 3640 4545 CURRENT(I) F11 909.09 181862 | 4,00 2727,3 6 18 L 8.11 F12 Key = A TABLE 2 (15km) Color Code Brown, greeb, Orange -MEASURED VALUES- U1 0.000 -MEASURED VALUES- RESISTOR VOLTAGE (VR) DC 1e-0090 Ammeter 133.3 266167 4106 4000 533.33 66667 10161 10.06 RESISTANCE** (R) and color code 0.85 kredited red redredred 1177 red redred 2,84 3.74 red redred red redre 4,62 Home SysRq RESISTOR VOLTAGE (VR) 2,23 8 10 *Use the nominal value of resistance ** Remove voltage from the circuit and measure the resistors using an ohmmeter End PrntScm Power switch on DC Power Supply 2.2k and 15k resistors, separately J1 yellow >R1 RESISTANCE** (R) and color code 2.2k Insert Brb, Grb, or6 Br6,676, 06 0146 012 72 6115 Brb ₂616 ₁0th 1409 8010 Brn, 616, oro 01541 Bros Gro jord 0706 0.000 CURRENT (1) CURRENT (1) U2 DC 10M Voltmeter Note: Ammeter must be placed in series with your circuit. This requires that you 'break' the circuit and insert the ammeter. The Voltmeter can be placed 'across' in parallel with the resistor. Never place the ammeter 'across' a load; it will be permanently damaged. tek I= I 15K

Fig: 1