PHY 134 Lab 2 Oscilloscope PDF

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Stony Brook University Department of Physics and Astronomy

PHY 134 Room: A116

Oscilloscope

Ahmad N. Chowdhury Lab Partner: TA: John Pederson Experiment Date: 14 September, 2020 Report Date: 23 September, 2020

Introduction: The purpose of this lab is to familiarize ourselves with the use of a cathode-ray oscilloscope. The oscilloscope is a fundamental technological innovation that provides us an opportunity to interrelate voltage and time through a graph that has certain shapes which will allow us to analyze certain waveform properties such as frequency, amplitude, time intervals, distortion, etc. Considering that the second sequence of physics pursues a better perception of electricity, it is vital that students familiarize themselves with how the mechanization works, in order to gain a full comprehensive perception of certain apparatus when performing experiments. This lab procedure will give us the opportunity to familiarize ourselves with the structure of the oscilloscope , how the oscilloscope depicts different data as a result of change in knobs, and how to effectively read and analyze the data through the graphs that are provided.

Materials: ● 1 Oscilloscope (2 Banana/BNC Adaptor) ● 2 Function Generator (2 Banana/BNC Adaptor, 1 each) ● 4 Banana cables, 1 Alligator Clip

Procedure:

1. First, we must first familiarize ourselves with all the knobs including: VAR knobs, signal type, Volts/div, Time/div, vert mode, trigger, trig slope, and position. 2. Switch the input mode to for CH 1 to DC and then adjust the focus, intensity, and position of the signal without an external output. 3. Once we created a stable line, we plugged in the wave generator into the oscilloscope. We confirmed the stability with the line on the screen by adjusting the calibration through the utilization of the line trigger. After, we recorded the Volts/div and measured the voltage and its error 4. We set the function generator to make a 3 kHz sine wave, measured the period and its error of the sine wave from time/div and estimated the frequency and error from its period. 5. Accordingly, adjust the 3 kHz sine wave so that it will also make a triangle and square waves. 6. For the last exercise, we used a second function generator in input 2, adjusting one generator to 400 Hz and the other to 500 Hz. 7. We turned on the x-y mode and adjusted the frequencies as necessary in order to create a stable Lissaiou figure.

Data and Calculations:

Fig. 1 Square Wave

Fig. 2 Sine Wave

Fig. 3 Overlapping Sine Waves

Fig. 4 Lissajous Figures

https://docs.google.com/spreadsheets/d/1AI6KMJD4shZ-QXNbxuNORHJbgrbgusywk_SqWfEC JYk/edit?usp=sharing

I know my data table is very blurry. I have tried taking many pictures but this is the best i could get. I have attached the link to my data sheet. For this lab, I struggled to find the uncertainty in some boxes and it’s incomplete. I didn’t want to fill it in with wrong numbers. Hopefully you understand and I will stop by your office to understand uncertainty more. Thank you.

Discussion and Conclusion:

This lab experiment focused on implementing the significance of the oscilloscope to students through the familiarization of the controls and analyzation of the electrical measurements of the powerful tool. There are several components of the oscilloscope that are used to generate various depictions of electrical power. The VARS knob is solely utilized to calibrate the oscilloscope in order to efficiently gather a signal from an external source. The volts/div and time/div establish a scale that is applied to the wave, allowing measurement of the wave through volts and seconds. The trigger determines voltage magnitude for the signal being received so it can have a stable appearance on the screen. The input signal type such as AC, GND, and DC describe the source and type of the signal. The vert mode is comprised of CH1 and CH2, which describe the channel in which the waves are received. If two signals are being transmitted to the oscilloscope, then the vert mode is set to ‘duel’ to receive the signals at CH1 and CH2. All in all, the purpose of this laboratory experiment is to comprehend the uses and functions of the cathode-ray oscilloscope. However, there are areas where errors might stem from using the oscilloscope. For example, the uncertainty in reading the voltage of the battery stems from the intensity (thickness) of the line shown. In order to create better results and more efficient use of such a valuable tool, we should perform another experiment that solidifies the fundamentals that were implicated through this simple yet effective experiment....