lastfuckinlab - on the volts/div scale. F= (1/(length of the

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The Oscilloscope and AC Circuits Name: Jordon Weber Date: 4/20/2010 Name: ____________________________ Lab Sect.: 02 Name: ____________________________ Lab Instructor: ______________________ Lab Activity 1: Using the oscilloscope as a DC voltmenter Q1. Write down the readings you obtained above. Single battery volts/div 1 volts/div vertical deflection [cm] 1.6 cm voltage [V] 1.6 V Two batteries in series volts/div 1 volts/div vertical deflection [cm] 3.2 cm voltage [V] 3.2 V Lab Activity 2: Using the scope to measure the amplitude and frequency of a periodic voltage signal Q2. Suppose you want to measure the frequency of a periodic input signal using the scope. Describe how you would go about doing this, i.e. , write down a relationship between the frequency f of the signal, the setting on the "sec/div" scale, and the size of the pattern on the scope’s grid. The frequency is directly related to the amount of periods per unit length (2*pi). The sec/div is the sampling rate for the oscilloscope and the size of the pattern is the amplitude of the voltage
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Unformatted text preview: on the volts/div scale. F= (1/(length of the period*(sec/div))) Lab Activity 3: Using the oscilloscope to analyze a series RLC circuit Q3. Using an Excel spreadsheet, plot the voltage amplitude versus frequency. Include a printout of the graph with your lab report. Q4. At approximately what frequency is the voltage amplitude a maximum? (Again, this is known as the "resonant frequency" of the circuit.) Resonant frequency : 90 Hz Q5. We saw in the introduction that the impedance Z is a minimum at this particular "resonant" frequency. Based on the expression for the impedance Z in Eq. 3 and the condition described above, derive a relationship between the resonant angular frequency ω , the capacitance C, and the inductance L . Be sure to show how you arrived at your result. Impedance at a minimum means that X 1 = X c wL= 1/wc w = 1/sqrt(Lc) Use this relationship and the value of C = 100 μF to deduce the value of the inductance L . W=2piF=1/sqrt(100E-6*L) L= .03127 H...
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This note was uploaded on 05/01/2010 for the course EMCH 211 taught by Professor Ventsel during the Spring '06 term at Pennsylvania State University, University Park.

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lastfuckinlab - on the volts/div scale. F= (1/(length of the

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