Engineering lab 4 03.08.09

# Engineering lab 4 03.08.09 - Yes the time delay was exactly...

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ENGR 111B: Foundations of Electrical & Computer Engineering Lab 4: RC Timing Team Members: Joseph Hamidi David Montemayor Section Number: 508 Team Number: 4 This Lab is due by the Beginning of the Next Lab Session. Written By: Dr. Hank Walker Lorne Liechty

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Reference voltages for time delays Battery Voltage (V) 8.13 V 0.63 * Battery Voltage (V) 5.12 V 0.63 Voltage Time Delay (s) 10 s 0.39 * Battery Voltage (V) 3.17 V 0.39 Voltage Time Delay (s) 5 s Theoretical voltage for 15 s delay (V) 6.32 V Actual voltage for 15 s delay (V) 5.35 V Table R1 Timing to 4.5V Including Tolerances 20% Cap Tolerance 10% Cap Tolerance Min Max Min Max 95 kΩ 5.50 ~ 7.74 6.06 ~ 7.18 100 kΩ 5.73 ~ 8.10 6.32 ~ 7.51 105 kΩ 5.97 ~ 8.45 6.59 ~ 7.83 Table R2 Answer the following questions: 1. When you set the reference to 0.63 times the supply voltage, was the time delay close to 10 seconds? If not, what are possible explanations for the error?

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Unformatted text preview: Yes, the time delay was exactly 10 seconds when the reference was set to 0.63 times the supply voltage. 2. Did your measurements fall in the ranges in Table R2? No the measurements did not fall in the ranges in table R2. 3. Explain any error between theoretical and actual resistance in the 15 second delay in Table R1. When we applied the theoretical voltage, the wheel never spun. The actual voltage needed to cause the 15 second delay was lower than the theoretical voltage. 4. Was there any difference in time delays for “go and spin” compared to “spin and go”? If so, what are possible explanations? Very Different. The go and spin is slower biased off of the internal resistance of both motors running. With only one running, the resistance is lower and the car gets to the specified voltage faster....
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Engineering lab 4 03.08.09 - Yes the time delay was exactly...

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