ECE210 Laboratory
Lab Report #1
Fall 2020
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Lab section:
2 Laboratory exercise
2.1 Objective
• Building a simple RC
... [Show More] circuit and explore capacitor characteristics
• Determining RC time constants
• Using the Network analyzer of Scopy to examine frequency response for a RC circuit
• Building a simple envelope detector and understanding the mechanism of the envelope detector
2.2 Capacitor Characteristics
Figure 3: RC circuit for laboratory exercises.
In this section, you will study the characteristics of the capacitor in the network of 3. Once you have built the network
on the breadboard, connect the circuit with M2K as shown in Figure 4, and complete these steps in Scopy :
Figure 4: RC circuit on breadboard.
1. Apply a 800 Hz sine wave vin(t) measuring 5 V amplitude to the RC circuit as shown in Figure 3. (go to
Signal Generator module in Scopy and select “Sine” and input 5 V for “Amplitude” and 800 Hz for “Frequency”).
Display voltage vin(t) and vC (t) using Channels 1 and 2 of the oscilloscope, respectively.
(a) What is the phase difference in degrees between vin(t) and vC (t)? This can be approximated from inspection, but obtain an accurate measurement using Cursor tool in the Oscilloscope module. (In Oscilloscope
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module, look for in the bottom right of the UI. Enable/disable the cursor by clicking the
square)
Time difference= ( /2)
Phase difference (in degrees) =Time difference Period ⇥ 360o = ( /2)
(b) Repeat step 1a with a 1 kHz sine wave input:
Time difference= ( /2)
Phase difference (in degrees) =Time difference Period ⇥ 360o = ( /2)
(c) Is vC (t) leading or lagging vin(t)? Hint: If one waveform is leading another, “it happens” earlier in time.
vC (t) is vin(t). ( /2)
2. Set the input frequency to 4 kHz for this part. Determine the amplitude of current i(t) in the circuit by
first measuring the voltage vR(t) across the 2.2k⌦ resistor. You can measure vR(t) without moving your M2K
connection—instead, subtract Channel 2 from Channel 1. By KVL, vin = vR + vC , so vR = vin vC . This
subtraction can be displayed on the Oscilloscope using the math panel
• Go to Oscilloscope module in Scopy, look for next to the Channel 2 setting in the bottom of
the UI and click it.
• In the math setting panel, input “t0-t1” for f(t) as shown in Figure 5 (“t0” and “t1” represent the
time series for channel 1 and channel 2)
Figure 5: math panel in Sco [Show Less]