# Oscilliscope and RC Circuit

The biggest problem is that I have no knowledge about the math for oscilliscopes. This is a post lab but all we actually did was push a few buttons to record measurements, we did not go into any detail about the methods, just what an oscilliscope was supposed to measure.

1. The problem statement, all variables and given/known data
1) You place an AC voltage signal of amplitude 1.7 V and with a frequency of 1200.0 Hz, into the input of an oscilloscope.
(a) Find the distance displayed on the screen of the oscilloscope for a full wave, if the sweep speed is adjusted to 104 µsec/DIV.

(b) If the vertical gain is set to 0.34 V/DIV, how many divisions will the wave span from peak-to-peak of the wave?

2) Consider a series RC circuit with a R = 3.0 Ω and a capacitance of 14 µF being charged to a voltage of 8.0 V.
(a) If you wished the charging of this capacitor to have a vertical displacement of 4.0 DIV from 0 charge to fully charged, what value must you set the vertical gain on the oscilloscope to achieve this?

(b) What is the value of the horizontal sweep that you would need to use if you wished the characteristic time constant of this circuit to span 2.0 DIV on the oscilloscope screen?
2. Relevant equations
I’m afraid I don’t know. I have been going off units to get the answers I have.

3. The attempt at a solution
I have 1a and 2a. For 1a I simply took 1/1200 Hz and divided it by the 104E-6 seconds/DIV to get 8.01 divisions. For 2a I divided the voltage by the divisions to get 2 V/DIV.

1b is looking for units of divisions and I tried 1.7 V divided by 0.34 V/DIV but the answer I got (5 divisions) was wrong.
2b is looking for units of microseconds/division and I’m afraid I’m not sure where to start, I think it has to do with the current but I’m not sure

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