Lab 15

Oscilloscope, an engineer's best friend

a simulation of what is happening inside an oscilloscope

The device

This function generator reminds me of my MOOG synthesizer! except is much more primitive and obviously not designed as a musical instrument.

Using this battery connected to this switch, we wanted to measure the results on the Oscilloscope.

The signal as it it not connected. Same as the ground.

with the switch engaged we can observed what kind of Voltage output the battery has. From the looks of it, it is around 1.2V.

Because we were extremely experimental and did not trust the initial value, we wanted to get a more precise reading. We switched the increments to .2V per Bar

Looking at the graph, we can see that the output voltage is 1.24V.

We were feeling satisfied.

Running the Function Generator into the Oscilloscope. Using a sine wave. As you can see in the picture the data is junk, because our "var sweep" knob is fully engaged, totally altering the input signal.. smh

Using a square wave into the not calibrated device. Because this was solely for observational purposes, the lack of calibration did not haunt us, and we quickly fixed it after.

Testing a phone charger:

I dont have a picture of the charger we tested, but it was the highly sought after name brand "Buddy"...

Here we can see the amount of noise of the AC signal coming from it. Pretty decent

Checking the DC signal on the other hand gave a terrible signal. Compared to the high quality DC power supplies we have in class (which put out a straight line 

Things got really interesting once we introduced this second function generator into the mix.

We were able to get really interesting results, where one FG was assigned to the x-axis, and the other to the y-axis. 

Got carried away

If we put both Generators to the same frequency we were able to get a nice circle with minimal motion.

Mystery Box Experiment:

We were able to get an AC signal with the red and black connection

A similar signal was archived using the green and black. We are pretty sure that there is a square wave inside the mystery box, although the ends of the squares are pretty curved. Jason was suggesting that that is because the device is not calibrated. I'm not quite sure. It could be because there is some blend between a square and sine wave maybe.

A strange slope appeared

Alright, this thing is truly a mystery box. What we know for sure is that there are only AC current coming from it.

A little description of what we observed and the frequency and amplitude of each setting.