ME 455 Lab 1

docx

School

Metropolitan Community College, Kansas City *

*We aren’t endorsed by this school

Course

455

Subject

Mechanical Engineering

Date

Feb 20, 2024

Type

docx

Pages

Uploaded by CountSparrow1077

FALL2021. ME 455. Mechanical Engineering Measurements and Experiments Experiment #1. Basic Instrumentation Name: Brandan Herrera Lab Section: Wednesday 10:00-11:50 Group Members: Hal Vieyra, Seth Harper Section 1. Experiment summary (15 Points) (~250 words) Using the different measuring devices (Oscilloscope, Function Generator, Digital Multi Meter, DC Voltage Power Supply) know how to produce different and read results. Using the function generator, generate different signals and change parameters of the signal. Using the oscilloscope, know how to read a signal by adjusting the vertical, horizontal and trigger to adjust the bounds of the wave. Using the digital multi meter, know how to read and select the appropriate results. With the DC voltage power supply, know how to supply and measure the voltage being produced. Using resistors, be able to decipher the amount of resistance they offer through the color of the stripes on the resistor. As well as be able to combine all these different machines to be able to read multiple outputs by a single input. Section 2. Recorded data (40 Points) Table 1: Measurement of a signal output from FG using OS and DMM Signal Waveform Amplitude set V pk-pk [V] Frequency set [Hz] Amplitude RMS [V] Frequency measured [Hz] OS DMM OS DMM Sine ~2 100 2.1 0.681 100 100.2 Sine ~0.8 10 0.8 7.56 10 10.7 Sine ~4 9k 4 0.9 8.99k 8.99k Sine ~0.4 9k 0.4 0.08 8.99k 0.00 Sine ~ 10 5M 10.2 0.023 5.00M 0.00 Sine ~ 0.5 5M 0.503 0.00 5.04M 0.00 Square ~ 0.8 10 0.79 0.384 10.36 10.36 Square ~ 2 9k 2.05 0.545 9.03k 9.003k Square ~ 10 5M 10.1 0.021 5.03M 0.00 Triangle ~ 10 5M 10.1 0.000 5.04M 0.00 Triangle ~ 2 9k 2.01 0.366 9.08k 9.002k Triangle ~0.8 10 0.81 0.219 10.015 10.01 Table 2: Comparison of measuring a signal RMS voltage using OS and DMM Method Voltage [v] % Error Expected RMS Voltage 1.41 0 OS Measured RMS Voltage 2.01 30 DMM reading 0.688 51.2 Table 3: Resistor Measurements Resistor Value from DMM (with units) Color Band Resistor 1: 148 OHMS B,G,B,S Resistor 2: 272.4 OHMS R,P,B,S

Resistor 3: 152M OHMS B,G,Y,S Table 4: Measuring a Signal in Air Antenna length OS Sampling rate Signal frequency Signal amplitude Sinusoidal wave? 8 ft 500M samples/s 178 kHz 1.3 V Yes 3 ft 10 in 2G samples/s 92.8 Mhz 6.9 mV Yes Section 3. Plots and analysis (0 Points)  N/A Section 4. Questions (30 Points) Question 1 : Check your RMS and Frequency measurements using OS and DMM in Table 1. Are they always very close in value? Explain your result. Answer 1: They are pretty close in value because there is not a resistor in a DMM which would throw the values off due to KVL. The only ones that differ are the ones where the Hz was in the mega or 10^6 Hz because the largest value that the DMM could read was in the kHz. The OS was a lot more accurate because it could withstand the voltages and Hz the function generator was throwing at it in comparison to the DMM. Question 2 : Set OS input terminal to DC coupling, what happens to the signal shown on OS when the DC OFFSET button on FG is pressed in and adjusted off-center? Answer 2: The DC coupling does not have any visual effects on the OS because DC coupling still has both AC and DC components. In other words, DC coupling does nothing because nothing is being added or removed from the trigger circuit. Question 3 : Set OS input terminal to AC coupling, what happens to the same signal shown on OS when the DC OFFSET button on FG is pressed in and adjusted off-center?? Answer 3: AC coupling changed by “blocking” certain or slow varying voltages that travel through the OS after it passes through the trigger circuit. In other words, it would remove the DC components while keeping the AC coupled outputs. Question 4: What happens to the square, triangle, and sine waves when the DUTY CYCLE is rotated clockwise and counterclockwise? (Hint: make a chart that describes changes, if any, in the frequency, RMS voltage, rise time, fall time and overall appearance for the signals.) Answer 4: 2 | P a g e

Electrical Device Power Supply + - D C Question 5: Describe in detail, how to measure the current in the following circuit using the DMM. Draw this connection on the schematic. Place an X through any connection(s) that need to be disconnected, if necessary. Section 5. Conclusions (15 Points) (~100 words)  Did the group complete the goal of the lab? Stating yes or no is insufficient for labs with more data driven goals. In this exercise’s case the goal is get “hands on” experience with the data analysis of wave functions and gain an understanding of the types of errors that can occur when sampling incorrectly.  What would you change about this lab? What data (if any) could you not obtain? Be specific as to the reason you would change the lab. If you feel that you didn’t meet the criteria for success on this lab how might you change that? 3 | P a g e

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version