Lab 7 Hints
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Transcript of Lab 7 Hints
![Page 1: Lab 7 Hints](https://reader036.fdocuments.us/reader036/viewer/2022062721/5681360a550346895d9d815a/html5/thumbnails/1.jpg)
Lab 7 Hints
![Page 2: Lab 7 Hints](https://reader036.fdocuments.us/reader036/viewer/2022062721/5681360a550346895d9d815a/html5/thumbnails/2.jpg)
Activity 1C, 1B
![Page 3: Lab 7 Hints](https://reader036.fdocuments.us/reader036/viewer/2022062721/5681360a550346895d9d815a/html5/thumbnails/3.jpg)
Activity 1A
Battery or power supply (in previous picture)
![Page 4: Lab 7 Hints](https://reader036.fdocuments.us/reader036/viewer/2022062721/5681360a550346895d9d815a/html5/thumbnails/4.jpg)
Activity 2Oscilloscope lets you see the voltage across capacitor as a function of time
Function generator mimics a battery that switches sign
Capacitor
Resistor
![Page 5: Lab 7 Hints](https://reader036.fdocuments.us/reader036/viewer/2022062721/5681360a550346895d9d815a/html5/thumbnails/5.jpg)
Circuit
Wires from function generator
Capacitor
Resistor
![Page 6: Lab 7 Hints](https://reader036.fdocuments.us/reader036/viewer/2022062721/5681360a550346895d9d815a/html5/thumbnails/6.jpg)
Connect oscilloscope
Capacitor
Oscilloscope leads
![Page 7: Lab 7 Hints](https://reader036.fdocuments.us/reader036/viewer/2022062721/5681360a550346895d9d815a/html5/thumbnails/7.jpg)
Set up the function generator to mimic a battery that switches
polarity“Square wave” mimics a battery that switches back and forth
![Page 8: Lab 7 Hints](https://reader036.fdocuments.us/reader036/viewer/2022062721/5681360a550346895d9d815a/html5/thumbnails/8.jpg)
Adjusting the oscilloscope
1) Set to “Auto”
2) Set to “Gnd”
3) Adjust until line is in middle of screen. This is the zero voltage line.
4) Set to “DC”
![Page 9: Lab 7 Hints](https://reader036.fdocuments.us/reader036/viewer/2022062721/5681360a550346895d9d815a/html5/thumbnails/9.jpg)
You should see this
Adjust voltage scale (vertical) here.
Adjust time scale (horizontal) here
![Page 10: Lab 7 Hints](https://reader036.fdocuments.us/reader036/viewer/2022062721/5681360a550346895d9d815a/html5/thumbnails/10.jpg)
Adjust the vertical scale (pull center) and trigger level until you get this….
![Page 11: Lab 7 Hints](https://reader036.fdocuments.us/reader036/viewer/2022062721/5681360a550346895d9d815a/html5/thumbnails/11.jpg)
Measure the time constant
• Time that it takes rising curve to reach 5/8 of the maximum
Time constant
![Page 12: Lab 7 Hints](https://reader036.fdocuments.us/reader036/viewer/2022062721/5681360a550346895d9d815a/html5/thumbnails/12.jpg)
Measure the time constant
• Time that it takes falling curve to reach 3/8 of the maximum
Time constant