Lab 3 TF EIM

RC Low-pass filter

1-50 kHz filter (20 pnts)

1. Design a low-pass RC filter with a break point between 1-50 kHz. The break point is the frequency at which the filter starts to attenuate the AC signal. For a Low pass filter, AC signals with a frequency above 1-50 kHz will start to be attenuated (not passed).
2. Now construct the circuit using a non-polar capacitor.
3. use a sinusoidal variable frequency oscillator to provide an input voltage to your filter.
4. Measure the input and output voltages for at least 8 different frequencies which span the frequency range from 1 Hz to 1 MHz.
5. Graph the -vs-

phase shift (10 pnts)

1. measure the phase shift between and

Questions

1. compare the theoretical and experimentally measured break frequencies. (5 pnts)
2. Calculate and expression for as a function of , , and .(5 pnts)
3. Compare the theoretical and experimental value for the phase shift . (5 pnts)
4. Sketch the phasor diagram for ,, , and . Put the current along the real voltage axis. (30 pnts)
5. what is the phase shift for a DC input and a very-high frequency input?(5 pnts)
6. calculate and expression for the phase shift as a function of , , and graph -vs . (20 pnts)