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4 Low-pass filter In the first step an RC-low-pass-filter using 10 K2 und 100 nF shall be analysed. The input signal shall be generated by the function generator. To measure the input signal, connect the function generator to channel 1 of the oscilloscope. The output of the RC-filter should be measured using channel 2. 2. Task (P): Draw the measurement setup including function generator and oscilloscope. 3. Task (P): Calculate corner frequency and time constant of the low pass. 4.1 Rectangular input signals (step response) In the following the circuit is analysed using rectangular input signals. Change amplitude, frequency, duty cycle and DC offset to explore the behaviour of the circuit. Configure the oscilloscope that at least one full periode of the signal is visible on the screen. Input and output signals as well as their amplitudes shall be visible as well. 4. Task: Analyse the behaviour of the circuit using the following input signal: rectangular (50% duty cycle), periode 60 t, 12 V peak-peak, O V DC-Offset (signal -6V to +6V!) Add a screen shot of the oscilloscope screen. Describe the output signal. Note characteristic properties.
EFS Screenshot (60 t): Description: 5. Task: Change the period of the input signal to 6t. Add a screen shot of the oscilloscope screen. Describe the output signal. Note characteristic properties. Screenshot (6t): Description:
6. Task: Reduce the period of the input signal to 0.6 T. Add a screen shot of the oscilloscope screen. Describe the output signal. Note characteristic properties. Screenshot (0.6T): Description: 7. Task: Determine the precise amplitude the output signal using the input of the previous task. Hint: Change resolution of the oscilloscope to get a more precise reading of the value. Theoretical/calculated Measurement results value (H) Amplitude (0.6) 8. Task: Determine the period for which the output signal has a amplitude (peak-peak) of I V? Theoretical/calculated Measurement results value (H) Period T Ratio T vst