Lab 2 (1)

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California State University, Sacramento *

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Electrical Engineering

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Dec 6, 2023

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Lab 2: Oscilloscope and Function Generator EEE 117L 09/06/2023 Instructor: Jim Quilici
Title: Oscilloscope and Function Generator Lab results: Part 1: DMM measurement 0.177 mV This is the calculation for R1 because I had a different capacitor
Part2: Table 1: Parameter Calculated Measured % difference Frequency 1 kHz 1.02 HZ 0.02% Period 1 ms 1 ms 0% Output Amplitude at Fc (when Vin =1V Peak) 0.707 V 0.720 V 1.83% Output Delay 125 µs 123 µs 1.6% Output Phase Shift 45° 44.28° 1.6% Table 2: Changing the frequency from 100 Hz to 10k Hz and finding the max table Frequency (Hz) Max (1) (V) Max (2) (V)
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100 1.15 1.11 10k 1.05 0.140 Phase = (123 µs/1 ms)*360 = 44.28° Sine wave: Square wave:
Triangle/Ramp wave: Part 3: The Offset +1 and DC wave:
Discussion Q&A: 1. What is the difference between voltage measurements made with the DMM and the oscilloscope? The oscilloscope has a 50Ω resistor inside of the plug so the measured value of the DMM would be lower. 2. Show the input/output signals found in Part 2. Are they about 45° apart? Show your phase Calculation The phase calculation is shown below table 2. It was close to 45°, the measured was 44.28°. 3. At what frequency does the output signal amplitude begin to exhibit attenuation Around the frequency 1.114k Hz is when the output signal amplitude begins to exhibit attenuation. 4. Between 0.1x Fc(100Hz) and 10xFc (10kHz), what is the attenuation difference, in units of dB?
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When it was just 100 Hz, it was only about 0.04 dB, but when it was 10k Hz, there was a difference as you can see in table 2. 5. What happened when the triggering level was changed from + to -? It should have made the waves back to the middle, so it would be like AC without the offset. 6. What happened when the coupling was changed from AC to DC in part 3? Explain the difference between DC coupling and AC coupling on the vertical channel. From AC to DC it was a huge difference, when putting the offset to +1, it didn’t change much when it was in AC. But when changing AC to DC (you can see on the image above), everything shifted upwards. DC coupling allows you to see all signals from 0 Hz up to the max bandwidth of your scope. AC coupling filters out DC components.