Oscilloscope Report - Grade: B+ PDF

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Summary

Today in class I talked a little bit about how knowledge of conservation of momentum led to the discovery of a particle called the Neutrino. These are very interesting particles, very difficult to detect because they do not have any electric charge...

Description

Oscilloscope Report

Cover Date

April 17, 2018

Title of the experiment

Oscilloscope

The name of the lab instructor

Xinlei

The name of all group members

Gihyeok Kim

Students ID number

1719172

Introduction This experiment was about oscilloscope which is a device that outputs a screen with a variation in input voltage over time. The purpose of this experiment was to comprehend the fundamental operating concepts of the oscilloscope, types of measurement, and to investigate how the observed signal varies with respect to time. An oscilloscope is composed basically of cathode ray tube, called CRT that contains an electron gun, a couple of set of deflection plates, and a fluorescent screen. The roles of the electron gun and the deflection plates were to produce electronic beams, and to deflect electronic beams made from the electron gun respectively, to represent a pattern on the fluorescent screen. A waveform generator is a circuit that produces a waveform of the desired frequency and shape. If high frequency of voltage signal is applied to the deflection plates, the time interval between two adjoining electrons bump is shorter than that of fluorescence lacking in, then a straight vertical or horizontal line will be presented on the screen. Furthermore, the signals transmitted on the vertical plate are represented as a function of time and in the horizontal direction can be analyzed with its period obtained by X/K where X is the displacement and K is a value. In addition, if frequencies of two sinusoidal signal one from the X input and the other one from the Y input are in precisely integral ration, it will be possible to observe stable figures called Lissajous Patterns on the screen.

Experimental Setup and Procedure In this experiment, Oscilloscope, function generator, and coaxial wires were basically used as apparatus. The sequence of preparations for the experiment was as follows: firstly, the oscilloscope signal was connected to CH1 or both of CH1 and CH2 to observe the waveform, and the values of period, frequency and peak-to-peak voltage according to different sine waveforms were recorded. Additionally, the patterns on the screen had to be centered under X-Y mode.

Results and Discussion 1. The voltage, period and frequency of the oscilloscope internal calibration signal Calibration Signal 1

1kHz; 3V

V

T

f

3.04V

1.000kHz

1.000ms

2. The voltage, period and frequency according to different sine waveforms AC Signal

Vp-p

Vp

V

T

F

1

100Hz; 8V

18.16V

4.08V

2.88V

10.00ms

100.0Hz

2

500Hz; 10V

10.2V

5.12V

3.56V

2.000ms

500.0Hz

3

1kHz; 12V

12.2V

6.08V

4.28V

1.000ms

1.000kHz

4

5kHz; 15V

15.2V

7.6V

5.34V

200.0us

5.000kHz

3. Plot Lissajous Patterns corresponding to each ratio of frequency fx : fy = 1:1

fx : fy = 1:2

fx : fy = 1:3

fx : fy = 2:1

fx : fy = 2:3

fx : fy = 3:1

fx : fy = 3:2

fx : fy = 3:4

Based on the results, as the frequency and voltage increased, the figures of Vp, V and f rose whereas of Vp-p and T decreased. As each ration of frequency grew from 1:1 to 3:4, Lissajous

Patterns were on the screen became more complicated. As is shown in the first graph, when Frequency and Voltage were 1kHz and 3V respectively, V=3.04, T=1.000kHz, and f=1.000ms. The second graph illustrated that when Frequency and Voltage were 100Hz and 8V, Vp-p=18.16, Vp=4.08, V=2.88, T=10.00ms, and f=100.0Hz, when these were 500Hz and 10V, Vp-p=10.2, Vp=5.12, V=3.56, T=2.000ms, and f=500.0Hz, when these were 1kHz and 12V, Vp-p=12.2, Vp=6.08, V=4.28, T=1.000ms, and f=1.000kHz, and when these were 5kHz and 15V, Vp-p=15.2, Vp=7.6, V=5.34, T=200.0us, and f=5.000kHz respectively. Moreover, the above test results showed that the formula was formed when applied to the formulas Vp-p=2Vp, V=Vp/2^(0.5), T=1/f. As the values were either very similar or precise to the formulas. However, since the number of each signal changed continuously rather than remaining at a stable value, there might be an error in the result. To get a near perfect answer to the experiment, I would suggest a better environment , experimental tools and a better understanding of the experiment for improved experiment. Conclusions As a conclusion, this experiment was about the oscilloscope and how it operated with particular ratio of frequency. The results showed that as the frequency and voltage increased, Vp, V, and f increased whereas Vp-p and T decreased. In addition, the higher the ratio, the more complicated the patterns. This experiment would be more successful in a improved condition with better experimental tools and a high degree of understanding of experiment....