EEL3472C UFL Science Lab 6 Build And Measure A Capacitor

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I need someone to help me to do post lab Assignment only one page. I will upload the assignment and the lab experience with my answer and post lab template.

EEL3472C: EE SCIENCE II - EM Lab: __#___Title:__(10 pt font)_____ Date: 00/00/2017 Name: ____(10 pt font) ________ Lab Partner(s):__(10 pt font)__________ SUMMARY OF RESULTS AND DISCUSSION (PARAGRAPH STYLE , 12 PT FONT, SINGLE SPACE ) In this section, you should summarize and analyze your results. In other words, tell me what you learned and what the results mean to you. Things to avoid: • • Don’t write EVERY step you did in class (I connected the function generator to the oscilloscope, then I turned it on…etc) Do not rewrite the lab manuscript Things to include • • • • • • Knowledge about the equipment and attachments (Eg: “Channel 1 of the oscilloscope is connected across the input of the circuit and channel 2 across the capacitor. The configuration allows you to compare the output with the input.”) Understand results (what each or group of values mean to you) If there are too many results you can create a table Graphs and equations are also acceptable (reference them in your text) Guide me though the whole lab exercise using your own words and understanding Something in the lab that you did not understand or results not clear to you EXPERIMENTAL QUESTIONS (PARAGRAPH STYLE , 12 PT FONT, SINGLE SPACE ) • Answer/complete any additional questions asked during/ at the end of the lab experiment LAB IMPROVEMENTS (THIS IS OPTIONAL , BUT HELP US IMPROVE THE LABS!) • • Tell us what went wrong and what can be done to avoid those mistakes in the future Mention any lab procedures that were confusing General rules: Minimum of 1/2 page written (be creative, I don’t want to see reports less than one full page) Maximum of 1 page written (include figures/graphs/tables on extra pages) Body Format: font size - 12pt (Times New Roman), Spacing - Single This post lab report must be stapled on the front of the completed lab experience. Additionally, a copy of this report must be submitted online via canvas (you do not have to submit the completed lab experience online). Maximum grade of 50% (5/10) if signed lab experience not included.
Laboratory #6 EE Science II Laboratory #6 Build and Measure a Capacitor Laboratory Assignment Identify the model of the function generator and oscilloscope on your bench. Function Generator (Model no.): _________________ Oscilloscope (Model no.): ____________________ Problem Statement: How will you construct and measure the capacitance of a parallel plate capacitor? Solution outline: 1. Break problem statement into smaller steps a. The problem has two main questions: (1) Construct a parallel plate capacitor, and (2) measure the capacitance of the prototype. 2. What you need to find out a. For (1) we will need to identify/review the constructional features of the parallel plate capacitor. Fundamentally, a capacitor is two conductors separated by a dielectric. In the case of a parallelplate capacitor, the two conductors are oriented such that they are parallel to each other. Also, which dielectric material will we use? I.e., which material can provide sufficient capacitance, and is easy to handle – should also have known dielectric constant. b. For (2), we will need to build out a circuit – with known circuit elements, and characterize the response. In effect we will use the unknown capacitor for an application – and based on our knowledge of how this circuit should behave – calculate the capacitance. i. From previous lab – RC circuit is well understood 3. How you will obtain the data a. Circuit elements – so use an oscilloscope, multimeter. Etc -- what other equipment will we need. 4. How you will validate the test setup a. Recreate the circuit with a known capacitance and check 5. How will you know if your answers are correct? a. Compare with theoretical expectation b. What are the sources of error? Part I: Assemble and Measure a Parallel Plate Capacitor In this part of the lab, you will assemble the capacitor designed in problem 1 of the prelab, use the capacitor to build an RC circuit, measure the time constant of the RC circuit, and then calculate the capacitance from the time constant. • Complete Table I with values calculated in problem #1 in the prelab Table I: Fill in details from problem 1 of prelab. Be sure to specify all necessary units. Group number Area of the capacitor Material assigned as capacitor dielectric in Problem 1 in the Pre-lab Thickness of the dielectric Dielectric constant of the material Calculated capacitance University of South Florida 2 EE206-exp.doc Laboratory #6 • Assemble the capacitor designed in Table I 1. The laboratory kit assigned to your group consists of dielectrics clad with metal on both sides. The dielectrics can be identified by the numbers written on them and have been cut to according to the dimensions in Table I. 2. Select the dielectric assigned to your group. Create leads for your capacitor by attaching single strand wires on the metal plates using copper tape. An example for the same is shown in Figure 1. Ensure that the leads make a good electrical contact with the metal. Figure 1: Assemble your parallel plate capacitor. • Assemble an RC circuit to measure the capacitance – 1. Measure the resistance given to you using an LCR meter and write down the value below. The resistance will be close to 1 kΩ. Measured R = _________ 2. On a breadboard, assemble the RC circuit with your capacitor and the resistor measured above as shown in Figure 2. This is similar to the circuit you assembled in lab 5 so please refer to the lab experience for lab 5 for details. Figure 2: Connecting the RC circuit to the function generator and oscilloscope. University of South Florida 3 EE206-exp.doc Laboratory #6 3. You might have noticed that the capacitances designed in the prelab are very small in magnitude – on the order of nF. Measuring such small values can be challenging and you will have to account for unwanted measurement artifacts - the most prominent ones being cable capacitance and parasitic capacitance across the port of the oscilloscope. These parasitic capacitances add in parallel with your capacitor as shown in Figure 3 and increase the measured rise time (recall that τ = RC). 4. One method to eliminate the errors is to use specialized oscilloscope probes that contain tunable series capacitances to compensate for the parasitic capacitance. The other method is to measure the capacitance of the cable and the oscilloscope and subtract them from your measurement value. In this lab, you will use the latter. 5. We are going to perform the following steps in this experiment – ▪ Measure the cable and oscilloscope capacitance without your capacitor – The objective of this step is to find cable and oscilloscope capacitance so that you can remove their effects from the final measurement. Removing C in figure 3 results in Ccable + Coscilloscope forming a series RC circuit with R and the net capacitance can be found by measuring the time constant. ▪ Replace C in your circuit and calculate the total capacitance by measuring the time constant. ▪ Subtract the parasitic capacitance from the total capacitance to obtain the capacitance of your capacitor. ▪ Compare your answer with calculations from the prelab. Figure 3: Cable and oscilloscope capacitance add in parallel and affects the measurement of time constant. • Check your circuit to confirm that the function generator and oscilloscope are connected as shown in Figure 2. Before proceeding to the next part of the laboratory, ask your TA to check your circuit and obtain his/her signature on the first page • Set up the input waveform – 1. Select the output port on the function generator by pressing the button marked “Channel”. Select “Output Load” and set “CH1 Output Load” to “HighZ”. University of South Florida 4 EE206-exp.doc Laboratory #6 • 2. Press “Waveforms” and select “Square Wave” 3. Press “Parameters” and set Frequency = 100 Hz, Voltage = 1Vpp, DC offset = 500mV 4. Ensure that the output is turned off by selecting “Channel” → “Output off” Measure the capacitance – 1. Remove your parallel plate capacitor from the setup. The resistor, R now forms an RC circuit with Ccable + Coscope (refer to Figure 3). 2. Turn on the function generator by selecting “Channel” → “Output on” 3. Display the signal on the oscilloscope (Refer to WAMI Lab Oscilloscopes Operation Guide for detailed steps) – i. Display channels 1 and 2 on the oscilloscope screen and ensure that the impedance of both channels is 1 MΩ. ii. If the signals are not stable on the screen, change the trigger source to channel 1 – • Under “Trigger”, select “Menu” and change source to “1” iii. Align a rising edge of the square wave on channel 1 with the y axis at the center of the screen. You will notice that channel 2 also aligns with the y axis during this process. iv. Change the vertical scales of BOTH channels to 200mV per division and adjust the vertical position so that both the waveforms are clearly displayed on the screen. Ensure that the x axis of both the channels are aligned to lie on top of each other. Turn on averaging (see oscilloscope manual). v. Adjust the horizontal scale such that you zoom in on the rising edge of channel 2. vi. Use the Measure option and add peak-to-peak voltage and minimum voltage measurements for channel 2. Note down these values in Table II. Also, calculate V63.2% in the first column of Table II. vii. Turn on the cursors and measure the signal on channel 2 – press “Cursors” and then press “2” (the button corresponding to channel 2). The color of the cursors will change to the color of the waveform on channel 2. viii. Move one cursor to the start of the rising edge. Move the other cursor such that the voltage difference between the two cursors reads the value calculated for V63.2%. The corresponding value of time is the time constant of the circuit. Note down this value as τ1 in Table II. ix. 4. Using the measured value of R, calculate the capacitance, C1. Replace your parallel plate capacitance in the circuit and measure the time constant, τ2 using the steps outlined above. Fill in the second column of Table II with your measurements. Table II: Measure a simple parallel plate capacitor. Without the capacitor With the capacitor Peak-to- voltage, Vpp = _______ Peak-to- voltage, Vpp = _______ Minimum voltage, Vmin = _______ Minimum voltage, Vmin = _______ V63.2% = Vmin + 0.632 Vpp = _________ V63.2% = Vmin + 0.632 Vpp = _________ Measured time constant, τ1 = ________ Measured time constant, τ2 = ________ University of South Florida 5 EE206-exp.doc Laboratory #6 Measured capacitance, C1 = • 1 R = _______ Measured capacitance, C2 = 2 R = _______ Calculate the capacitance the capacitance of your capacitor from your measurements. Observations Calculated capacitance = C2 – C1 = ____________ How does this value compare with your theoretical calculations in Table I? Calculate the error percentage between the calculated and measured results. Before proceeding to the next part of the laboratory, ask your TA to check your circuit and obtain his/her signature on the first page Part II: Assemble and Measure the Capacitors Designed in Problem 2 and 3 of the Prelab • Complete Table III with results from problems 2 and 3 of the prelab. Table III: Data from problems 2 and 3 of the prelab Problem 2 of the prelab Dielectric 1 Dielectric 2 Dielectric 3 Calculated capacitance Problem 3 of prelab Assigned capacitance Dielectric 1 Dielectric 2 • In the prelab, you calculated the capacitance of a capacitor comprising of three dielectrics arranged in series. This is the same capacitance that you would obtain if you arranged three capacitors in series, where each capacitor is made up of one of the three dielectrics. Therefore, you will build your capacitor by stacking up metal clad substrates. • Assemble and measure the capacitor in problem 2 – a. Using the materials provided to you, assemble the capacitor as shown in Figure 4. Use plastic binder clips to hold the three substrates together and connect the wires using copper tape to create capacitor University of South Florida 6 EE206-exp.doc Laboratory #6 leads. Ensure that the wires make good electrical contact with the metal – use fresh copper tape if you need to! Figure 4: Assembling the capacitor in problem 2 of the prelab. b. Follow the procedures PART I and complete Table IV. c. Calculate the capacitance the capacitance of your capacitor from your measurements. Table IV: Measure the capacitor in problem 2. Without the capacitor With the capacitor Peak-to- voltage, Vpp = _______ Peak-to- voltage, Vpp = _______ Minimum voltage, Vmin = _______ Minimum voltage, Vmin = _______ V63.2% = Vmin + 0.632 Vpp = _________ V63.2% = Vmin + 0.632 Vpp = _________ Measured time constant, τ12 = ________ Measured time constant, τ22 = ________ Measured capacitance, C12 = 12 R = _______ Measured capacitance, C22 = 22 R = _______ Observations Calculated capacitance for Problem 2 = C22 – C12 = ____________ How does this value compare with your theoretical calculations in Table III? Calculate the error percentage between the calculated and measured results. Before proceeding to the next part of the laboratory, ask your TA to check your circuit and obtain his/her signature on the first page • Assemble and measure the capacitor in problem 3 – assemble and measure the capacitor in problem 3. Fill-in Table V with your measurements. Table V: Measure the capacitor in problem 3. University of South Florida 7 EE206-exp.doc Laboratory #6 Without the capacitor With the capacitor Peak-to- voltage, Vpp = _______ Peak-to- voltage, Vpp = _______ Minimum voltage, Vmin = _______ Minimum voltage, Vmin = _______ V63.2% = Vmin + 0.632 Vpp = _________ V63.2% = Vmin + 0.632 Vpp = _________ Measured time constant, τ13 = ________ Measured time constant, τ23 = ________ Measured capacitance, C13 = 13 R = _______ Measured capacitance, C23 = 23 R = _______ Observations Calculated capacitance for Problem 3 = C23 – C13 = ____________ How does this value compare with your theoretical calculations in Table III? Calculate the error percentage between the calculated and measured results. Before proceeding to the next part of the laboratory, ask your TA to check your circuit and obtain his/her signature on the first page Laboratory Report 1 2 3 4 A one-paragraph summary of the laboratory assignment. 5 pt Comment on why a square wave was used as the input waveform. What factors would you consider while deciding the amplitude and frequency of the square wave? Show mathematically that the capacitance of a capacitor consisting of three dielectrics stacked in a series fashion is the same as the equivalent capacitance of three capacitors connected in series, where each capacitor is made up of one the three dielectrics. Comment on the accuracy of your measurements and possible sources of errors. 8 2 pt 1 pt {Optional} – Suggestions to improve the laboratory experience. University of South Florida 2 pt EE206-exp.doc
Laboratory #6 EE Science II Laboratory #6 Build and Measure a Capacitor Summary Parallel plate capacitors are commonly used in microelectronic circuits, electro-optical circuits etc. In this laboratory you will design, assemble and measure parallel plate capacitors. You will be given pre-cut dielectrics of specified dimensions and dielectric constants. In the pre-laboratory exercise each group will calculate the capacitance of a capacitor formed by a single substrate and a stack of three substrates, after which each group will design a capacitor by stacking two substrates. The capacitors designed in the pre-lab will be assembled and tested during the lab session. During the course of this lab you will a) perform an initial design using theoretical design equations, b) fabricate the capacitor, c) use the fabricated capacitor in an RC circuit and determine the time constant, and d) calculate the capacitance from the time constant and compare with the desired value. For this lab, you will need to review the procedures followed in labs 2 and 3. Objectives • Gain an understanding of parallel plate capacitor design with single and multiple dielectrics • Assemble the designed parallel plate capacitor • Use an RC circuit to measure the capacitance of the capacitor and compare with the desired value Equipment and Software • Function generator • Oscilloscope • Materials for assembly – substrates, copper tape, clips, jumper wires, breadboard, resistors University of South Florida 1 EE206-sum.docx

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School: Rice University

Your delivery is enclosed. If there are any problems, please let me know. I'll get back to you as soon as I can.I am an experienced, self-driven, motivated and ambitious full-time writer, researcher and tutor with vast experience in engineering, mathematics, architecture,physics, lab reports, engineering drawings, writing, research projects etc.Please contact me if you or your friends need help.I can also handle online courses to get you A+ gradeThanks again and have a great day! :)

EE SCIENCE II

Lab: #6Title: Build and Measure a Capacitor

Date: 18th Feb 2019

Name: ____(10 pt font) ________

Lab Partner(s):__(10 pt font)__________

SUMMARY OF RESULTS AND DISCUSSION
In this lab, parallel plate capacitors were designed, assembled and measured with the main
objective of understanding the design of the single and multiple dielectrics in capacitors. The RC
circuit was used in this experiment to measure the capacitance of capacitors and a comparison
made between the measured and calculated values.
The experimental results clearly portray that the capacitance in circuits depends on the charge
and the potential difference between the two plates. In specific terms, the potential difference
between plates of the capacitor is directly related to the charge on the capacitor and inversely
related to the capacitance.
EXPERIMENTAL QUESTIONS
The sum of sine waves at a particular frequency has been proven to be mathematically equivalent
to the square wave. For this, the square sine was applied as the input waveform in this laboratory
exercise. The factors to consider while determining the frequency and amplitude of the square
wave are the span of the function and the offset.
The percentage of error of less than 10% in both cases was in agreement with the range of
experimental uncertainty (see Table 1 – 3). Probable sources of error may be attributed by wrong
experimental setup or mistakes while taking measurements.
The total capacitance is given as, C =
negative plates given as, E =

...

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Anonymous
awesome work thanks

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