140 lines
5.0 KiB
TeX
140 lines
5.0 KiB
TeX
%! TEX root = ../thesis.tex
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\chapter{Experiments}
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<contains the experimental observations defined in th theory>
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\section{Characterization}
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\subsection{sampling time}
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The first experiment needed to run was selecting an optimal number of cycles for which the adc will probe the to it at that moment connected pin.
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The ADC Sampling works by connecting one of the internal 12bit ADCs to a given Pin and then taking a sample value and disconnecting from the Pin, this proceure repeats fo all given pins and is bound to a Timer, whose Interrupts define the number of Ticks an ADC has to process the connected Voltage on a Pin.
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In this case the uncalibrated measurement of our input voltage was taken as example, and repeated with each of the possible 8 settings of the in Firmware used value.
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The resulting errors can be seen in figures \ref{sampleticks1} and \ref{sampleticks2}
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\begin{figure}[H]
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\centering
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\hspace*{-.16\columnwidth}
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\includegraphics[width=1.3\columnwidth]{./data/m04_cycledepends/cycledepends_20180529.pdf}
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\caption{plotted difference from set input voltage, and fitted linearly, May 29th 2018, $\approx$32\si\degree C}
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\label{sampleticks1}
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\end{figure}
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Both figures \ref{sampleticks1} and \ref{sampleticks2} contain the relative error of the measured voltage compared to the theoretical , set input voltages. therefore the reference measurements (yellow), taken with an external multimeter, are not at 0.
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Also shown are the calculated gain erors which would need to be corrected for in case of all 8 settings.
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Important in figure \ref{sampleticks1} is the relative error in only the 0th case, here the cycleTime-Setting was set to 0 and therefore the smallest available sampletime. All other measurements are within errormargin of each other.
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The secondary plots confirm the
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\begin{figure}[H]
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\centering
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\hspace*{-.16\columnwidth}
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\includegraphics[width=1.3\columnwidth]{./data/m04_cycledepends/cycledepends_20180530.pdf}
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\caption{plotted difference from set input voltage, and fitted linearly, May 30th 2018, $\approx$25\si\degree C}
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\label{sampleticks2}
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\end{figure}
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\subsection{Voltages}
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\subsubsection{48V Input}
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\subsubsection{9.6V Output}
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\begin{figure}[H]
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\centering
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\hspace*{-.16\columnwidth}
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\includegraphics[width=1.3\columnwidth]{../pitstop/20180706/v10_0_nocalib.pdf}
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\caption{TODOF}
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\label{v10_precalib}
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\end{figure}
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\subsubsection{1.8V Output}
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\begin{figure}[H]
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\centering
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\hspace*{-.16\columnwidth}
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\includegraphics[width=1.3\columnwidth]{./data/m02_adccalib_48/adccalib_v18ana.pdf}
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\caption{}
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\label{1v8anabefore}
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\end{figure}
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\begin{figure}[h]
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\centering
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\hspace*{-.16\columnwidth}
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\includegraphics[width=1.3\columnwidth]{./data/m02_adccalib_48/adccalib_v18digi.pdf}
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\caption{}
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\label{1v8digibefore}
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\end{figure}
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\subsection{Currents}
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\subsubsection{48V Input}
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%TODO: 19.6 and 20.6 unusable
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% \begin{figure}[h]
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% \centering
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% \includegraphics[width=\textwidth]{../pitstop/20180619/i48.pdf}
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% \caption{Calibration of input current adcs 19.06.2018}
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% \label{}
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% \end{figure}
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% \begin{figure}[h]
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% \centering
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% \hspace*{-.16\columnwidth}
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% \includegraphics[width=1.3\columnwidth]{../pitstop/20180620/i48.pdf}
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% \caption{Calibration of input current adcs 20.06.2018}
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% \label{}
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% \end{figure}
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\begin{figure}[H]
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\centering
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\hspace*{-.16\columnwidth}
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\includegraphics[width=1.3\columnwidth]{pitstop/20180621/i48.pdf}
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\caption{Calibration of input current adcs 21.06.2018}
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\label{}
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\end{figure}
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\subsubsection{9.6V Output}
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\subsubsection{1.8V Output}
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\begin{figure}[H]
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\centering
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\hspace*{-.16\columnwidth}
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\includegraphics[width=1.3\columnwidth]{pitstop/20180702/i18ana_nocalib.pdf}
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\caption{Pre Calibration Measurement of Output Current at the 1.8V Analog Terminal (2.7.2018)}
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\label{precalib18iana}
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\end{figure}
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\section{after Calibration}
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\inputminted{yaml}{pitstop/pitdb.yaml}
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\subsection{Voltages}
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\subsubsection{48V Input}
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\subsubsection{9.6V Output}
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\subsubsection{1.8V Output}
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\subsection{Currents}
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\subsubsection{48V Input}
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\subsubsection{9.6V Output}
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\subsubsection{1.8V Output}
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\begin{figure}[H]
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\centering
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\hspace*{-.16\columnwidth}
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\includegraphics[width=1.3\columnwidth]{pitstop/20180629/i18ana_postcalib.pdf}
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\caption{Post Calibration Measurement of Output Current at the 1.8V Analog Terminal (29.06.2018}
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\label{postcalib18iana}
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\end{figure}
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\section{1.8V Regulation}
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\subsection{Characterization of Dropoff}
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\subsection{after <METHOD>-Correction}
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\section{Pitfalls}
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