From: Michael Traxler <M.Traxler@gsi.de>
Date: Thu, 30 Jan 2014 17:08:35 +0000 (+0100)
Subject: added Padiwa Threshold Measurements, mt
X-Git-Url: https://jspc29.x-matter.uni-frankfurt.de/git/?a=commitdiff_plain;h=f8db037cf3a5f25de93807e584cf19e683c38cd3;p=daqdocu.git

added Padiwa Threshold Measurements, mt
---

diff --git a/trb3/WasaFrontend.tex b/trb3/WasaFrontend.tex
index e41715b..16beafd 100644
--- a/trb3/WasaFrontend.tex
+++ b/trb3/WasaFrontend.tex
@@ -84,6 +84,33 @@ is measured with 1/16 degree resolution.
 This feature is not available in all design versions.
 If register 0x26 does not exist, it is not present.
 
+\subsubsection{Temperature Dependence and Compensation: Measurements}
+The uncompensated treshold voltage is affected by a thermal variation , around
+-150uV per 1°C. For a threshold of 1V and a temperature rise of 35°C (35°C to
+70°C) an offset of 5,5mV has been measured. The linear proportion of the
+thermal variation can be compensated which results in a voltage rise of only
+500uV for a temperature rise of 35°C.
+
+The compensation value of 0x02c0 was determined by measurement.
+
+To set the compensation value use the padiwa.pl script. For example
+„./padiwa.pl 0x303 0 comp  02C0“.
+
+\begin{figure}[htp]
+  \centering
+  \includegraphics[width=0.6\textwidth]{figures/padiwa_thresh_without_compensation.pdf}
+  \caption[]{Temperature dependence of the threshold without internal compensation.}
+  \label{fig:calibration}
+\end{figure}
+
+\begin{figure}[htp]
+  \centering
+  \includegraphics[width=0.6\textwidth]{figures/padiwa_thresh_with_compensation.pdf}
+  \caption[]{Temperature dependence of the threshold without internal compensation.}
+  \label{fig:calibration}
+\end{figure}
+
+
 
 \subsubsection{Some Hints for Beginners}
 
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