ENG 100 Lab 2 Report


ENG 100, Lab 2


April 22, 2004


Thursday 1-4pm


Part A: series LC circuit:


Plot of amplitude (dB) versus frequency (Hz):


Plot of phase (degrees) versus frequency (Hz):


Calculation for pre-lab amplitude and phase results for 1600 Hz:


w = 2*p*1600 = 10053.1


Amplitude = 1/(1 + w2*L2/R2)1/2 = 1/(1 + (10053.1)2*(0.1)2/(1000)2)1/2 = 0.7052


dB = 20*log (Amplitude) = 20*log (0.7052) = -3.033


phase = -Atan(wL/R)*180/p = tan(10053.1*0.1/1000)*180/p = -45.152


Calculation for experimental amplitude and phase results for 1600 Hz:


Experimentally determined that VRMS = 0.694.


dB = 20log(VRMS) = 20*log(0.694) = -3.17


Experimentally determined that td (microsecond) = 70


Phase = -360*1600*td*10-6 = -40.32


Part B: Series RC Circuit, I:


Plot of amplitude (dB) versus frequency (Hz):


Plot of phase (degrees) versus frequency (Hz):


Results:


Configuration A is a low pass filter. (The amplitude (Vo/Vi) of the transfer function goes to 1 as omega goes to zero, and goes to zero as omega goes to infinity.) (The amplitude (dB) decreases as omega goes to infinity.)


Configuration B is a low pass filter. (The amplitude (Vo/Vi) of the transfer function goes to 1 as omega goes to zero, and goes to zero as omega goes to infinity.) (The amplitude (dB) decreases as omega goes to infinity.)


Conclusion:


The results (both amplitude (dB) and phase (degrees)) obtained in lab were similar to the prelab results for configurations A and B.