Ensayo



Ubaldo Quintero
Lab report 6
May 4, 2009
TA: Derek Nielson

Tables, datasheet, and Graphs.

Part 1:
Initial V0 = .999 Vac
Measured Value of fc= 129Hz

Frequency
Phase shiftCalculation
0.1 fc
-5.73
Arcsin(2.5/2.5)
Fc
-37.57
Arcsin(1.25/2.0)
10 fc
-61.045
Arcsin(.35/.4)

Part 2:
Ft = 26KHz

Effect of removing inductors?

Volts peak to peak zero as theinductors are moved farther away, more centered creates higher voltage, highest when coils are in parallel(see picture on data sheet)

Part 3:
Frequency
V0
V0 in dB
100
1
0
200
.96
-.35458
500.86
-1.31
1k
.64
-3.8764
2k
.38
-8.4043
5k
.16
-15.9176
10k
.08
-21.9382
15k
.054
-25.3521
20k
.041
-27.774

Question 1:
Used components had different tolerances. Capacitors hada tolerance of 10% and resistors were 5%. Fc was calculated using the formula fc = 1/2piRC. In the initial prelab the theoretical fc was calculated to 159Hz. For an upper boundary the cutoff frequencywould be fc=1/2pi *1k*1*10^-6 = 159.154, and 1.1 x e-6 to create a cut off frequency of 144.68Hz. The measured value falls into this range, with a difference from the initial value. This would meantthe used components had larger values. Error was probable in the measuring of A, and B in the formula: phase shift = arcsin(A/B). Where A and B were measurement of the plotted lissajous pattern. Thiserror was related to the volts/division indicated on the oscilloscope. Each division is split into 5 sections, and can be further observed to guesstimate if it was on the high, middle, or low end ofeach tick mark. This increased the accuracy by about a factor of 10 compared with the volts/division.
Question 2:
This circuit performed similar to a radio frequency tuner. Ft is the peak resonantfrequency for the circuit. If this circuit were a radio receiver it would only let measurable levels of 26 kHz pass through the circuit. All other frequencies would be filtered out. The other...