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TECHNOLOGICAL INSTITUTE OF THE PHILIPPINES College of Engineering Electronics and Engineering Department LABORATORY ACTIVITIES in ECE 004 (PRINCIPLES OF COMMUNICATION) Course/ Section: ECE 004 / EC42FA2 SY/Sem: 2018-2019 2 nd Semester Submitted By: 1. TABING, AZRAEL DIOMARC M. - Leader 2. LIMOS, JOONHEE T. 3. PAR, JOSHUA P. 4. REYES, FRANCHESCA KATHERINE F. 5. RICO, ULDRICK FELIP R. DECEMBER 2018
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Experiment 2: Modeling an Equation Date Conducted : November 23, 2018 Date Submitted : December 14, 2018 Group Member : (1) ___________ (2) ______________ (3) _______________ (4) ___________ (5) ______________ Objective: The activity aims to enhance and develop analytical and experimental skills in using TIMS modeling equipment Intended Learning Outcomes: The student shall be able to: 1. familiarize TIMS Modeling equipmaent Results Needed: 1. Find a sine wave on CH1-A using the oscilloscope and place it in the upper half of the screen. Find a sine wave on CH2-A and place it in the lower half of the screen. Draw the diagram. 2. Vary the coarse control of the PHASE SHIFTER, and slow that the relative phases of these two signals may be adjusted. Observe the effect of the ±180° toggle switch on the front panel of the PHASE SHIFTER. Describe what happens. The toggling of the switch leads to the shift of phase of the signal being produced at Channel 2. The toggle switch shifts the signal up to 180°, meaning that the output signal of Channel 2 is somehow symmetrical to the output signal of Channel 1. 3. Adjust the g gain control of the ADDER until the signal at the output of the ADDER, displayed on CH1-B of the oscilloscope, is about 4 volts peak-to-peak. This is V 1 Draw the diagram; see if the amplitudes of V 1 and V 2 are equal. Graph:
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NULLING of two Signals 4. Reverse the position of the PHASE SHIFTER toggle switch. Record the amplitude of y(t), which is now the absolute sum of V1 plus V2. Set the signal to fill the upper half of the screen. What happens when the 180° switch is flipped back to the null condition, with the oscilloscope gain unchanged? Graph the output. The 180° toggle switch changes the phase of the second input negating or nulling the first input, leading to the flatting out of the output. The oscilloscope gain almost becomes a straight line when the toggle switch is set to the null condition. Graph: Observation: First part of the experiment shows how the sinusoidal signal works using the TIMS. It shows the effects of manipulating the signal to achieve the desirable output for the system. Application of adder and phase shift is also shown and demonstrated. The creation of signal can be manipulated using these applications. Adder is used to amplify or control the amplitude of the system while phase shifter is to null or amplify the output signal. Assessment Tasks 1. Why was the noise nulled at the same time as 1kHz test signal?
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