Lab Report 9
A. Procedure
In Lab 9: AC Power Measurements and Resonance, the students will apply AC
power concepts to the measurements of real and reactive power and the impedance of
RLC circuits. By varying the frequency of the input signal, the students will be able to
see that a series RLC circuit exhibits resonance behavior. These same techniques will be
applied for power measurements in AC circuits. Finally, the concepts of power factor and
methods of power factor corrections will be introduced to the students.
The students were first required to build a circuit with a 10 μF capacitor, a 120
mH inductor, and a 100 Ω resistor. These components would all be in series with an
ammeter and an oscillating function generator. Also, the oscilloscope should generate a
graph across the oscillating function generator and across the resistor. The students
should adjust the HP function generator to have a maximum output voltage of 20 Volts
peaktopeak and a frequency of 100 Hz. At this point, the students will record the
readings of the ammeter, the RMS voltage for channel one and the phase shift between
channel one and channel two. The phase shift will be equal to the time difference
between the two crossings multiplied by 360 degrees and divided by the period. These
measurements will be repeated for frequencies ranging from 100 Hz to 1000 Hz.
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 Fall '08
 SU
 Alternating Current, Frequency, Impedance, RLC, Electric power, Fluke Meter

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