Before we began working with the oscilloscope on Wednesday, we experimented a bit with a function generator that was hooked up to a small speaker. We initially had the function generator set to provide a sinusoidal output at 96 Hz which caused the speaker to emit a low buzz. We then noted that a square wave created a louder buzz and that a triangle wave created a lower buzz. We also noticed that changing the frequency altered the pitch and that increasing the amplitude created a louder, more intense sound.
The first thing we did with this rather ancient oscilloscope was connect a battery in series with a tap key in order to measure the voltage of the battery. We had the VOLTS/DIV knob set to 1 Volt per division and observed that the voltage of the battery was roughly 1.5 Volts as it should be.
This is a picture of what the oscilloscope displayed when we connected it to a DC power supply set at 4.5 Volts. This picture shows that the quality of the power supply is not all that great because of all the noise it produces. We were supposed to determine the amplitude of the noise, but this task turned out to be next to impossible with this particular oscilloscope.
Another task that proved to be difficult to carry out with this oscilloscope was to create lissajous figures when the oscilloscope was hooked up to both an AC transformer and the function generator. The picture above and the two below are examples of such figures when the function generator is set provide frequencies of 60 Hz and multiples of 60 Hz.
This is a picture of the diagram we constructed from our experiment with the "Mystery Box" we were provided in lab. There were a total of ten possible combinations that we could measure the output from using the oscilloscope. We could not determine exactly what was in the box, but it appears that there were some batteries of some kind and also perhaps a transistor that was producing a square wave.
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