Transcript LectureHx
PHYS3330: Lab Report * The purpose of the record of an experiment is to explain clearly and concisely what you are trying to do, what you actually did, what you actually observed, and what you concluded from your observations. *You lab report should be understood by someone who is not taking this courses. *Explain variables you introduce. Use the consistent symbols and variables throughout your lab reports including figures, tables and plots. *Your lab report must contain the followings: - Title - Objective - Idea/Apparatus/Theory - Procedure - Result and Data analysis - Conclusion Lab Reports: Details of Contents and Examples Title: Title of the lab name, Partner name, section etc Objective/Goal: One or two Sentences of Basic intent of the experiment Ideas/Theory/Apparatus: Describe the main ideas or equations that will be used in the lab. You can include the circuit diagram or schematics here. Ideas/Apparatus: Describe the main ideas or key equations that will be used in the lab. You can include the circuit diagram or schematics here. Procedure: Summary of process you followed while carrying out the experiment. no more than ½-1 pages. Voltage divider Wheatstone Bridge Copper wire resistivity measurement Result and Data Analysis: -The complete data set : Uses of table is strongly recommended - Calculation of results: Detailed numerical sample of each type with unit and conversion. - Relevant Plots (including axis label, unit, title) - If you have not reached the desirable results, explain how you troubleshoot and the result. Voltage divider Result and Data Analysis Wheatstone Bridge when the bridged is “balanced” (ΔV =0) When Rx changed by 5% by adding 50 Ω, ΔRx = 50Ω, ΔVmeausred = 0.184V ΔV_calc = 0.190 V. There was 3% discrepancy. ****Add PLOTS in this section if it is needed -Check axes labels, units and title. AND fitting equation!!! Fig.4 Bode plot for high Pass filter Result and Data Analysis Copper resistivity measurement Thus resistivity from DMM (ρDMM) and 4-terminal measurements (ρ4tc) is ρDMM = 1.5 μΩ cm and ρ4tc = 1.72 μΩ cm Each values has corresponding error coming from the reading of voltmeter. They are ...... These values is compared to the known value from the pre-lab 1.69μΩ cm has ***% of error. Conclusion: -Summarize your results and compare them to accepted or calculated values. (if you did this in analysis section, say again in brief form!) -If you have suspicions and/or large discrepancy in your result, discuss here with reasonable quantitative estimates -You lose points by simply unsubstantiated or incorrect guess -Stick to scientific conclusions! Not opinions, no personal comments! k Ω k Ω (Bad example) ... This lab was fun and I learned a lot. It is really sad that we did not get the right result in the end. Please vote for the time slot during which you are planning to attend the office hours on Monday. If you do not plan to make use of these office hours, please abstain from the vote! Monday: A) 9 - 10:30 B) 10:30 – 12 C) 12 – 1:30 D) 1:30 – 3 E) 3 – 4:30 Current schedule Please vote for the time slot during which you are planning to attend the office hours on Wednesday. If you do not plan to make use of these office hours, please abstain from the vote! Wednesday: A) 9:30 - 11 B) 11 – 12:30 C) 12:30 – 2 D) 2 – 3:30 Current schedule E) 5:30 – 7pm How many times have you read the lecture notes we post on the course web-page? A) Never B) 1 time C) 2-4 times D) >4 times E) every time How many times have consulted other text books than “The Electronics Companion” (such as H&H) A) Never B) 1 time C) 2-3 times D) >3 times Have you read the data sheet for the LF356? (pdf file available on web-page) A) Yes, and I did get something out of it B) Yes, but I didn’t understand it C) No Vin = –2 V. No load is attached to the circuit. Vout is: A) 1 V B) 4 V C) 6 V D) 7 V E) None of the above 17 What is Vout? 1k + +2 V Vout 2k +1 V 1k 1k A) +3 V B) +4.5 V C) +6 V D) +9 V E) None of the above 18 The open loop gain of this op-amp is 105 and the open loop bandwidth is 10 Hz. What is the bandwidth of a voltage follower made with this op-amp? A) B) C) D) E) 10 kHz 100 kHz 1 MHz 10 MHz Can not be determined Vin Vout The unity gain frequency of this op-amp is 5 MHz. What is the 3 db frequency of this circuit? A) B) C) D) E) 50 kHz 500 kHz 5 MHz 50 MHz Can not be determined 100k Vin 10k Vout I want to have a circuit with a bandwidth of at least 500 kHz and the largest possible gain. What feedback resistor should I choose ? Rf A) B) C) D) E) 1 kW 2.5 kW 5 kW 10 kW Can not be determined Vin 1k Vout fT = 2.5 MHz For identical positive constant Vin , rank VA–VD according to absolute value. Vin + VA Vin + VB 2k A) A > C > B > D Vin + VC B) D > A = B > C = 0 1k C) D > A = B = C D) D > B > C > A E) None of the above Vin + VD 2k 1k 24 For identical positive constant Vin , rank VA …VC according to absolute value. Vin 10k + 20k 5k A) B) C) D) E) VA Vin + VB Vin A=B=C B>A=C B>C>A C>B>A None of the above VC 20k 20k 5k 10k + 5k 25 H1 A) B) C) What is the voltage at the non-inverting input, VB? R VB V2 Rf VB Rf R Rf V2 V1 R VB V2 Rf R D) VB Rf Rf R V2 V2 R A R B Rf Vout H2 What is the voltage at the inverting input, VA? A) VA B) VA C) VA Rf V1R f Vout R R V1 R f Vout R V1 V2 Rf A R B Rf V1 R f Vout R D) VA R R Rf Rf Rf R V1 E) R VA V1 Rf R Vout H4 A) B) C) D) E) The open loop gain of this op-amp is 105 and the bandwidth is 10 Hz. What is the bandwidth of a voltage follower made with this op-amp? 10 kHz 100 kHz 1 MHz 10 MHz Can not be determined Vin Vout