Quick notes for PaDiWa

diff --git a/trb3/WasaFrontend.tex b/trb3/WasaFrontend.tex
index 5b5253cf5331a2c79cdead28ff7f3bef55186ef8..0efa56c2918f7ab3837c0b3549de2c53e17a28f4 100644 (file)
--- a/trb3/WasaFrontend.tex
+++ b/trb3/WasaFrontend.tex
@@ -10,7 +10,8 @@ The device contains:
  \item on-chip Flash to store configuration data
 \end{itemize*}
 
- 
+
+
 \subsubsection{Configuration}
 All configuration is done via a single-device SPI bus. The interface is kept similar to the LTC2600 to use the same SPI master code.
 Note that up to 16 commands can be sent to a board with one trbnet access: Load all commands to registers 0xd400 - 0xd40f, set the correct amount in 0xd411 plus Bit 7 to select the multi-write mode.
@@ -44,4 +45,23 @@ Note that up to 16 commands can be sent to a board with one trbnet access: Load
  \end{tabularx} 
 \caption{SPI component selection}
 \label{tab:spiselect}
-\end{table} 
\ No newline at end of file
+\end{table}
+
+\subsubsection{Some Hints for Beginners}
+
+Just some quick notes from a first user perspectives, also very bad
+Latex formatting, sorry.
+\begin{itemize}
+\item The thresholds can either be set by the padiwa.pl script in the
+  daqtools repository or via the web frontend (choose Padiwa SPI and
+  set the reference to 3300 mV). There's also some script which sets
+  the thresholds automagically.
+\item Due to the somewhat special design, it is expected behaviour
+  that you see no counts for very low thresholds, then some noise at
+  about the bias voltage (approx. 1.7 V) and then again no counts at
+  very high thresholds. The Board is designed for negative input
+  peaks, but positive could also work.
+\item Maybe you need to set the invert feature of the Padiwa board
+  such that the TDC in the peripheral accepts the events (only events
+  which are green highlighted in the Webinterface seem to be read out).
+\end{itemize}
\ No newline at end of file