DE LA SALLE UNIVERSITY – DASMARINAS

COLLEGE OF ENGINEERING, ARCHITECTURE AND TECHNOLOGY

EXPERIMENT NO. 1

“CHARACTERISTIC OF SINUSOIDAL VOLTAGE OR CURRENT”

SCORE:

CANIEDO, JOHN CARLO T. SUBMITTED TO:

DATE PERFORMED: 11 NOVEMBER 2014 ENGR. JUANCHO O. NATIVIDAD

DATE SUBMITTED: 25 NOVEMBER 2014

I. DISCUSSIONS AND ANALYSIS OF RESULTS

During the experiment, we are about to determine and begin to understand the

characteristics and behaviour of sinusoidal waveform of AC Voltage and Current.

We first conduct the experiment in simulation using LVSIM Software. After that, we

set up the Lab-Volt and connect the power supply and set the variac. After

connecting the wires and setting up the LVDAM, we observed using the

oscilloscope that the waveform is sinusoidal. We measured the output of the variac

using AC Voltmeter and Marked as Erms. We conducted 4 trials and observed that

the percent difference between measured Erms and the computed effective voltage

is not greater than 2 percent indicated in table 1-1, which means that the measured

voltage Erms can also be considered as effective voltage. We also measured the

peak-to-peak voltage knowing that it is 2 times the maximum voltage. We have

proven the theory that behaviour alternating current and voltages continuously

changes depending on the type of power supply. In each cycle it completes that

sine wave and that the value of one second is also measured in hertz units and it is

standardized at 60 cycles per second (60 hz) indicated in table 2-2.

II. CONCLUSION

Understanding the AC Waveform, I concluded that voltage level varies with time. I

observed that the RMS value of the waveform can also be considered as the

effective value of the input voltage. Knowing that the RMS value is given, I have

concluded that by dividing by square root of 2 the maximum voltage can be obtained.

After stabilizing the waveform and obtaining all the required measurements

pertaining to the waveform, I realized that by using the DC Voltmeter in reading the

AC Signal, likely it is really zero, but the slight variance in the measurement gets you

less than a volt it is proven and indicated in table 1-3. As provided in gathering data

by mean of simulation, actual and theoretical. Increasing the percentage reading in

Lab-Volt step down transformer can lead to a higher effective voltage and voltage

peak-to-peak. That the higher the effective voltage the higher the signal waveform

will be generated from it.

III. QUESTIONS AND PROBLEMS

1. Explain what it RMS Value?

Answer: The RMS value of a set of values (or a continuous-time waveform) is

the square root of the arithmetic mean (average) of the squares of the original

values (or the square of the function that defines the continuous waveform).

1. 2. Crest factor 2.  

Answer: is the peak amplitude of the waveform divided by the RMS value of

the waveform: The peak-to-average power ratio (PAPR) is thepeak amplitude squared

(giving the peak power) divided by the RMS value squared (giving the average power).

It is also the value where it reaches the maximum of RMS value.

3. In using Lab-Volt Powersupply, is it safe to perform the experiment while it is

turned on?

Answer: No, before turning it on, the student must first setup the configuration

before turning it on. And one precaution is to use one hand only while

performing the experiment.