Experiment 2 - Phase Determination Using The Lissajous Polar
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This document provides instructions for an experiment on measuring phase angle between two signals using a Lissajous polar display on an oscilloscope. Students are asked to construct a simple RC circuit with a function generator and measure the phase angle at different frequencies, recording the Lissajous and theoretical values in a table. They are then asked to write a report comparing the measured and calculated phase angles, and explaining the techniques of frequency and phase measurement using an oscilloscope. The objective is for students to learn how to determine phase using Lissajous patterns by varying frequency.
Experiment 2 - Phase Determination Using The Lissajous Polar
- 1. EEEC6430312 Measurements and Instrumentation Faculty of Engineering and Computer Technology Laboratory Manual Lecturer: Ravandran Muttiah BEng (Hons) MSc MIET Year/Semester: Year 2 / Semester 1 Academic Session: 2020/2021 The information in this documentis important and should be noted by all students undertaking the Bachelor of Engineering (Honours) in Electrical and Electronic Engineering Approved by Coordinator: Endorsed By Dean: ------------------------------------------ __________________
- 2. AIMST University Faculty of Engineering and Computer Technology BEng (Hons) in Electrical and Electronic Engineering Measurements and Instrumentation 1 Experiment 2 - Phase DeterminationUsing The Lissajous Polar Objective This experiment is to learn on how to measure the phase angle between two signals in oscilloscope by applying the theory of Lissajous polar by varying the frequency. Then the measured signals has to be compared with the theoretically calculated using the following formula, sin ? = ?2 ?1 Materials and Apparatus (1) Oscilloscope (2) Function Generator (3) Variable Resistor 4.7 K? (4) Capacitor 1 ¦ÌF (5) Breadboard ?2 ?1 Figure 1
- 3. AIMST University Faculty of Engineering and Computer Technology BEng (Hons) in Electrical and Electronic Engineering Measurements and Instrumentation 2 Procedure Construct the circuit shown in figure 2. Y X 4.7 K¦¸ ?in 1 ¦ÌF Figure 2 Compare the phase angle obtained from the Lissajous diagram with the one calculated theoretically. Vary the frequency of the input signal to five different values. Record your findings in Table 1. Table 1 ? Input ?2 ?1 ? (Lissajous) ? (Theoretical) The phase angle can be calculated theoretically by using the expression below, tan ? = ? ?c ?c = 1 2¦Ð??
- 4. AIMST University Faculty of Engineering and Computer Technology BEng (Hons) in Electrical and Electronic Engineering Measurements and Instrumentation 3 Report Write a laboratory report on this experiment. (1) Explain in detail about the techniques of frequency and phase measurement using oscilloscope. (2) Discuss the results that obtained for both the Lissajous and theoretical values.