MAE 334 – LAB 5 5 Hence the output is simply the input delayed by a time φ ( f0 )/2 π f0 and multiplied by | H(f0 ) |. Therefore by taking the ratio of output to input peak voltages we can easily determine | H(f0 ) |. By using different frequencies we can get | H(f) | for all of these frequencies. By measuring the time delay between the two signals (input and output) and setting the delay equal to ( f0 )/2 π f0 , we can find the phase angle function ( f ) for all of these frequencies as well. Do to the limitations of our ADC hardware it is very difficult to determine the phase lag accurately so we will not record this information. Given a high speed simultaneous sampling ADC or oscilloscope, this time delay can be easily measured. Procedure In this lab we will obtain the frequency response function of a passive single pole filter in a couple of different methods. The first method will involve inputting a number of different frequency sine waves, F(f0 ), into the filter and measuring the output,
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