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<html>
<body>
<hr size=4 width="66%">
<h2>Special POLDI scan command</h2>
<p>
Additionally a special POLDI scan command was programmed which offers the
possibility to scan variables (motor) against detector count rate. For this
purpose the 400 detector cells are divided into 4 groups (5-100, 101-200,
201-300, 301-395) where the count rates (stored in the histogram memory)
are added.
</p>
<p>
The command syntax for the POLDI specific scanning is like this:
<BLOCKQUOTE>
scanhm <i>var start delta np preset</i>
</BLOCKQUOTE>
All parameters must be specified. The parameters and their meanings:
<UL>
<LI><b>var start delta</b> This is how the variables to scan are specified. For
each variable scanned the name of the variable, the start value and the step wide must be given.
<LI><b>np</b> is the number of points to scan.
<LI><b>preset</b> is the preset to use for the counter. As the counter mode,
the mode <i>timer</i> is predefined.
</UL>
</p>
<p>
The scan data are saved in ASC-format in the directory /home/POLDI/scan.
Additionally the typical NeXus-files are available for each step of the scan.
The NeXus files are saved in the directory /home/POLDI/data/2002.
</p>
</body>
</html>