LabIIIreport - Name: Mohamed Kanaan Student no.: 208131765...

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Name: Mohamed Kanaan Student no.: 208131765 Lab III – Filters: Filters are signal-processing circuits used to modify the frequency spectrum of an electrical signal. They may be used to amplify, soothe, or decline a certain range of frequencies of their input signals. But for the case of this lab we will be dealing with low-pass filters in an RC circuit. Low-pass filters are filters that passes low-frequency signals but reduce the amplitude of signals with frequencies higher than the cut-off frequency. Filters are extremely useful in electronics, and are very helpful when it comes to applications that include noise reduction in communications, improving the sound quality of audio systems. Therefore the purpose of this lab we will construct to help us understand and analyze the properties of low-pass filters. We learned from our first lab that the oscilloscope is in great importance in electronics, and this is especially the case for this lab since it will show us the waves and signals which will help us understand and analyze our data clearly and easily. A certain feature on the Tektronix TDS200 Digital Storage Oscilloscope (DSO) is of great use to us. It is the Fast Fourier Transform (FFT), it can provide us with the frequency domain as well as it can provide us with a different view on the quality of the signal. Having mentioned and introduced everything to do this; we can begin the experiment by connecting the function generator to the oscilloscope, and allow it to generate a 50 KHz sinusoidal signal with the amplitude being 500 mV. From the oscilloscope, if we go to the MATH menu and make sure that the operation on the DSO is set to FFT , and that our Window option is Henning . Adjusting the SEC/DIV knob to set the x-scale to a reasonable value then on the screen of the oscilloscope would show the FFT or the Power Spectrum for the AC signal, the figure below represents the FFT of a sinusoidal signal with the frequency and amplitude as mentioned above, and the SEC/DIV is set to 25.0 KHz.
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Figure 1: FFT for a sinusoidal signal. This is an expected result, since this is an AC signal and the frequency is set to 50 KHz,
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LabIIIreport - Name: Mohamed Kanaan Student no.: 208131765...

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