User:Alexander T. J. Barron/Notebook/PHYC 307L Lab Notebook/Oscilloscope notes
I lost all of my superior notes up to now, when my browser timed out. However here are my pictures, without text:
SJK 01:09, 17 September 2008 (EDT)
Now, the rest of the lab:
I started out with edge, rising trigger @ 0.00 V. This projected the typical sin wave, with slope 1 @ t = 0. When I switched to falling trigger, my sin graph changed phase by pi, with slope -1 @ t = 0. Video trigger gave me a slowly moving double-wave - none of the options cleaned it up. Pulse triggering yielded more gibberish until I set the "when" option to ≠ instead of =. The Pulse Width was set to 1.00 ms, so the ≠ makes sense.
3) AC Coupling
I set V amplitude to ~10 V. Switching to AC Coupling raises and advances in time the whole function a very little bit.
To measure fall time:
cursor: peak = 8.28 V, end square peak = 6.68 V. time to fall (8.28-6.68) V = 4.400 ms. (8.28-6.68)/8.28 = 19.3% total. For 90% fall time: 4.400 ms x 90/19.3 = 20.5 ms.
SECOND TIME AROUND WITH 7 Hz::
Now that I can see the more pronounced fall time:
Cursor: peak = 8.60 V, fallen side = 600 mV. 10% of 8.6 is .86, so moved the second cursor to 800 mV. fall time is 62.00 ms.
By the equation V = V0(e^-t/tau), tau = 62 ms.