A histogram\footnote{Study performed during the previous test beam period (June 2010).} of the time intervals occurring between the scintillators trigger and the VFAT2 \textit{Fast-OR} signal provides further information about the time resolution of the whole DAQ system\footnote{DAQ stands for Data Acquisition. In this case the DAQ system consists of a large GEM detector with pad readout, and VFAT2 front-end chips.}. The narrower this distribution is, the higher is the time resolution, which indeed is the \textit{RMS} of the plot in \figurename~\vref{tdc}.\\
\begin{figure}
	\centering
	\includegraphics[width=12cm]{Images/TDC}
	\caption{Distribution of elapsed time between scintillators and VFAT2 \textit{S-Bit}s}
	\label{tdc}
\end{figure}

The same \figurename~\ref{tdc} also shows that:
$$
\dfrac{<TDC>}{1clk \: (25ns)} = \Delta t_{\left( SC_{trigger} \rightarrow FastOR_{trigger} \right)} \simeq 15clk
$$
which is only relevant if we are unable to set the right DAQ latency, for which $\Delta t$ can be used as an upper bound ($lat \leq \Delta t$).\\
