Doering_5_4S

Doering_5_4S - changing pulse pushes the bandwidth limits...

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5.4 – Response of the RL Circuit, Section 5-5 Summary Comparison: Results: v switch closed (V) peak (V) tau (s) Analysis 1.249 9.43 42.9 Simulation 1.25 9.174 43.06 Measurement 1.046 4.84 43 Relative Differences: Simulation -- Analysis 0.1% -2.8% 0.4% Measurement -- Analysis -16.3% -48.7% 0.2% NOTE: The large discrepancy on the myDAQ-measured peak voltage is discussed in the myDAQ section below.

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Analytical Solution:
myDAQ Results: Measure the voltage v while the switch is closed for a long time: DMM voltage is 1.046 volts (Vbatt adjusted to 1.249 volts).

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Setup to display switch voltage and voltage v(t): Function Generator setup:
Oscilloscope measurement of peak voltage and time constant: Peak magnitude is 4.84 volts. NOTE: This measurement is about 2x different than Multisim result. The rapidly-
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Unformatted text preview: changing pulse pushes the bandwidth limits and sampling time resolution of myDAQ which is sampling with a time step of 5 microseconds (200 kS/s). The maximum peak is probably missed by the oscilloscope. The half-life time is 30 microseconds, equivalent to a time constant of 43 microseconds . Further Exploration: The measured on-resistance of the DG413 Switch 2 is 17.3 ohms. The measured winding resistance of the 33-mH inductor is 88.7 ohms. The theoretical time constant with these values is 33e-3 / (88.7 + 680) = 42.9 microseconds; this value agrees with the measured value to within 0.2% ....
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This note was uploaded on 12/16/2011 for the course EECS 215 taught by Professor Phillips during the Fall '08 term at University of Michigan.

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Doering_5_4S - changing pulse pushes the bandwidth limits...

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