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02_El_Meas_II

# 02_El_Meas_II - INDIANA UNIVERSITY DEPARTMENT OF PHYSICS...

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INDIANA UNIVERSITY, DEPARTMENT OF PHYSICS, P309 LABORATORY Laboratory #2: Electrical Measurements II Goal: Measure time-varying electrical signals; measure capacitance and inductance; complex impedance; passive low-pass and high-pass filters. Equipment: large, non-polar capacitor (1-2 µ F), inductance (large coil), sine-wave generator, digital multi-meter, and oscilloscope. (A) Measuring Capacitance If you connect a resistor R across a capacitor C that is charged to U 0 , the capacitor discharges exponentially with a time constant τ = RC (note: 1 Ωּ 1F=1s). The R could be, for instance, the internal resistance of your DMM voltmeter (of the order of 10 ° 20 M ). The capacitor in your setup is about 2 µ F. Thus, the time constant is about 20 ° 40 s, long enough to be recorded by hand while the discharge takes place. Charge the capacitor to 30 V (from the bench power supply). Connect the DMM and read the voltage every 10 s. Switch scales when appropriate and follow the decay for at least 3 decades. Plot the voltage versus time on semi logarithmic graph paper and determine the

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02_El_Meas_II - INDIANA UNIVERSITY DEPARTMENT OF PHYSICS...

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