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Unformatted text preview: Objective: To gain familiarity with with PSPICE, and to review in greater detail the ac voltage dividers studied in Experiment 4. Procedure: 1. Connect the circuit in figure 1, choosing values of the resistor and the capacitor so that the reactance of the capacitor, 1/2fC, is equal to the resistance at a frequency of 4 to 5kHz. The reactance will, of course, be different at different frequencies. (all circuit diagrams are on the last page) We chose a frequency of 4.6kHz and a capacitor value of .01uF. Applying these values to the formula f = 1/(2*pi*R*.01uF), R equaled 3.459. Since 3.459 is not a standard value for a resistor 3.3k was substituted in. Reapplying to the equation above and now solving for f, we obtained the frequency to be 4.8kHz. Apply approximately a ten volt peak to peak sine wave from the function generator at frequencies 2 – 10kHz at 2kHz intervals to the input. Measure the input voltages with the DMM and with the scope. You will observe that the digital meter does not read ten volts.  Why does it not read 10 volts? o The DMM does not read 10 volts because it takes the RMS value of the AC voltage. Readings taken from step two applied to figure 1. Frequency Vin (Scope) Vin (Meter) Vout (Scope) Vout (Meter) Phase Shift 2 kHz 10V pp sin 3.38V 8.79 pp 2.76V22 4 kHz 10V pp sin 3.30V 7.46 pp 2.34V40 4.8 kHz 10V pp sin 3.29 7.11 pp 2.47V45 6 kHz 10V pp sin 3.28V 6.09 pp 1.88V51 8 kHz 10V pp sin 3.28V 5.05 pp 1.53V59 10 kHz 10V pp sin 3.27V 4.25 pp 1.26V64 What is the output voltage where the resistor and capacitor have the same impedance? o At 4.8kHz Vout is equal to 6.8V What is the output with a DC input? o If the input was 10V DC. The capacitor, at steady state, opens up and allows a connection directly to the output. Therefore the output is equal to the input of 10V with no phase shift. 1 What is the output voltage at 100 kHz? o Vout is equal to 0.467V which can be assumed 0V. X Y 600Hz 1200Hz 1800Hz 2400Hz 3000Hz 3600Hz 4200Hz 4800Hz 5400Hz 6000Hz 6600Hz 7200Hz 7800Hz 8400Hz 9000Hz 9600Hz10200Hz10800Hz 0.25V 0.5V 0.75V 1V 1.25V 1.5V 1.75V 2V 2.25V 2.5V 2.75V 3V 3.25V 3.5V 3.75V 4V 4.25V 4.5V 4.75V 5V Output Voltage Output Voltage as a Funtion of Frequency Frequency Phase Shift 2 kHz22 4.8 kHz40 4 kHz45 6 kHz51 8 kHz59 10 kHz64 2 X Y 550Hz 1100Hz1650Hz2200Hz 2750Hz3300Hz3850Hz4400Hz 4950Hz 5500Hz6050Hz6600Hz7150Hz7700Hz8250Hz8800Hz9350Hz9900Hz10450Hz11000Hz...
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This note was uploaded on 02/21/2012 for the course EE 3232 taught by Professor Feldman during the Fall '10 term at LSU.
 Fall '10
 Feldman
 Volt

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