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Capacitor Lab

# Capacitor Lab - PHYS 2300 Capacitor Lab RC Circuits...

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PHYS 2300 – Capacitor Lab RC Circuits Construct the circuit above. Use a mylar capacitor. Drive the circuit with a 500 Hz square wave, and look at the output (be sure to use the scope’s DC input setting). Measure the time constant by determining the time for the output to drop to 37%. Doe it equal the product RC ? SUGGESTION: some scopes have percent markings on the left edge of the scope’s display. These are perfect for this type of measurement. Just place the foot of the square wave on the 0%, the top at 100%. Then crank up the sweep rate so that you use most of the screen for the fall from 100% to 37%. Measure the time to climb from 0% to 63%. Is it the same as the time to fall to 37%? (If not, something is amiss in your way of taking these measurements) Try varying the frequency of the square wave. Differentiator Construct the RC differentiator shown above. Drive it with a square wave at 100kHz. Does the output make sense? Try a sine wave.

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2 Input Impedance Here’s your first chance to try getting used to quick worst-case impedance calculations, rather than exact and frequency-dependent calculations (which are often useless). What is the impedance presented to the signal generator by the circuit (assume no load at the circuit’s output) at f = 0?
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