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{\bf 2.14\_V2.0 UNFILTERED CCD ORBITAL BACKGROUND MEASUREMENT}
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\normalsize
\noindent{\it Last Revised: August 8, 1999}\\
\noindent{\bf Filename: bkg\_unfiltered} \\

\noindent {\bf BRIEF FUNCTIONAL DESCRIPTION:} \\
\normalsize
This procedure is executed after the ACIS door has been opened, but
while the HRMA sunshade and aft contamination cover are still closed.
It is designed to acquire the necessary data to characterize the ACIS
particle-induced background as a function of orbital position.
Consequently, {\em Chandra} must be in nearly its final orbit (apogee
$>120,000$~km) before this procedure is run.  This procedure uses
windows to reject all events in CCDs I0-I3 and the leftmost 2.5
quadrants of S2.  It telemeters all events in S3 and the rightmost 1.5
quadrants of S2.


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\noindent The sequence of actions will be: 
\be
\item warm boot and start DEA HKP if necessary
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\item configure the instrument to collect imaging array data
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\item execute the science run with the ACIS-I array, including a dump
of the complete configuration information
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\item return to thermal standby mode
\ee


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\normalsize
\noindent {\bf ASSUMED INSTRUMENT STATE:} \\
\normalsize
Assumes the ACIS door is open. \\
Assumes the standard patches are loaded. \\
Assumes ACIS is in the canonical thermal standby mode. \\


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\normalsize
\noindent {\bf SPECIAL INITIAL CONDITIONS:} \\
\normalsize
Assumes the HRMA sunshade and aft contamination cover are closed. \\
Assumes {\em Chandra} is in nearly its final orbit (apogee $>120,000$~km). \\

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\normalsize
\noindent {\bf OPERATIONAL CONSTRAINTS/CAUTIONS:} \\
\normalsize


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\normalsize
\noindent {\bf REFERENCES:} \\
\normalsize

\normalsize
\noindent {\bf CHANGE HISTORY:} \\
\normalsize

{\bf V1.0}
\begin{itemize}
\item Initial version, copied from procedure 2.11\_v2.0, ``CCD ORBITAL 
BACKGROUND MEASUREMENT WITH THE ACIS DOOR OPEN''.
\item Changed filenames from ``bkg\_doorop'' to ``bkg\_unfiltered''
\item Changed command mnemonic from ``WT000BE014'' to ``????'' and
command Id from ``729'' to ``????'' in step 3.1.
\item Inserted new step 3.2 to load window block ``????'' with command
Id ``????'' to filter all events from I0-I3 and the leftmost 1.5 quadrants
of S2.
\item Changed time required field in step 3.15 to 180 min.
\item Changed telemetry format field to format 2 in step 3.15.
\item Deleted steps 4, 5, and 6.
\item Renumbered old step 7 to step 4.
\end{itemize}

{\bf V2.0}
\begin{itemize}
\item added command mnemonics and IDs in steps 3.1 and 3.2
\end{itemize}

\newcommand{\tablecaptiontext}{CCD Orbital Background Measurement
Unfiltered}
\input{bkg_unfiltered.tab}

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