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Feb 20, 2024
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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) In this laboratory, familiarity and proficiency with common instruments are essential for future laboratories in the class. Four primary instruments that will be used through the semester include the function generator, oscilloscope, DC power supply, and digital multimeter, each serving distinct purposes in experimental setups and evaluations. The function generator generates various waveforms like sine, square, or triangular waves at different frequencies and amplitudes. By using the function generator, it can be connected to the oscilloscope which visually displays electrical signals, helping in waveform observation, measurement, and troubleshooting. As well as the function generator, a DC power supply can be used as well with the oscilloscope by producing a constant voltage and can be viewed on the oscilloscope. The digital multimeter serves as a versatile tool for measuring voltage, current, resistance, and continuity in circuits. By selecting appropriate measurement ranges, one can interpret readings accurately to assess circuit parameters. To master these instruments, hands-on practice and comprehension of their functionalities are ideal. Groups were tasked to set desired waveforms on the function generator, interpret signal behavior on the oscilloscope, regulate voltage and current on the DC power supply, and measure various parameters using the digital multimeter. By gaining proficiency with these instruments, execute experiments accurately, troubleshoot circuit issues that should arise in future experiments. As well as being able to see how different lengths of cord from the DC power supply can affect the sample rate, signal frequency and signal amplitude to demonstrate how choosing different wire lengths may effect the results you are looking for versus the result that you received from the experiment. 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 2.01 30
2 | P a g e
RMS Voltage 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:
Some of the values are pretty spot on because they are within the range of both machines. On the parts that not close to each other can either be instrument set up, user error or there were not enough significant figures to produce a Mega Hertz when it could produce a kilo Hertz.If the DMM was able to read megahertz then the values would match up pretty close to the values from the oscilliscope. 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:
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