DoE
Design of Experiment
Design of Experiment
Intro
Our group's DoE task was to design and conduct an experiment to extract the actual values of a selected component in our parts kit. Our TA provided us with a mystery capacitor to measure. The experiment can only use the signal generator and oscilloscope available at the work station , but you may also use your multi-meter to verify resistor values.
Data Collection
Our TA gave us two unknown capacitors with the same value that had its code scratched out. In order to make sure our experiment was running smoothly we tested our design on capacitors in our parts-kit. We were able to find the values of the 1uF and ceramic capacitors but had trouble with the 47 uF and 1000 uF. When testing the two capacitors we measured two different values so we averaged them to obtain the value of 203.5 nF.
DoE Brainstorming
At the beginning of the DoE we had an idea of measuring the time constant of the capacitor to find the value of the capacitor. After the rough draft we decided to change our approach due to the fact we thought we could find an easier way. We put a known value resistor in series with a capacitor hooked up to the function generator.
Results
We thought our results were going to be very accurate due to the fact our design was working with the ceramic capacitors in our parts kit. Unfortunately we were pretty far off because the actual value was 0.47 uF.
Pictures
DoE
Calculations
This is the work for our DoE that shows the two values that we measured but eventually averaged.
Pic 1
In this figure we are measuring the Vr value when measuring the capacitors value to be 217Â nF.
Pic 2
In this figure we are measuring Vc when measuring the capacitors value to be 217 nF.
Pic 3
In this figure we are measuring Vc when measuring the capacitors value to be 190 nF.
Pic 4
In this figure we are measuring the Vr value when measuring the capacitors value to be 190Â nF.
Design of Experiment
In this figure it shows the set up of our design and how we calculated the unknown capacitor with a known resistor.
Reflective Writing
After doing this experiment I was pretty disappointed because I thought we were going to come out with the correct value. Even though we did not come close it was a good experience designing an experiment.