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\centerline {\bf 4.19\_V2.0 RADIATION BELT ENTRY PROCEDURE } 
\vspace{0.25in}

\normalsize
\noindent{\it Last Revised: June 29, 1999}\\
\noindent{\bf Filename: radbelt\_entry} \\

\noindent {\bf BRIEF FUNCTIONAL DESCRIPTION:} \\

This procedure is intended to be used during the normal science
mission to prepare the ACIS instrument for passage through the
radiation belts.  It is expected that the previous science run will
have been halted by a ``Stop Science'' command included in the daily
command load and scheduled at the appropriate time by the OFLS SW.
Nevertheless, since it is no harm to the instrument to send this
command twice, this command is sent again in this procedure.
After that the video board power is turned off to protect some
radiation sensitive components.

\normalsize
\vspace{0.25in}
\noindent The sequence of actions will be: 
\be
\item issue a Stop Science Run command
\vspace{-0.10in}
\item turn off the video board power
\ee


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\normalsize
\noindent {\bf ASSUMED INSTRUMENT STATE:} \\
\normalsize
Assumes the instrument is on and has just completed a science run. \\


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\normalsize
\noindent {\bf SPECIAL INITIAL CONDITIONS:} \\
\normalsize
None.

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\normalsize
\noindent {\bf OPERATIONAL CONSTRAINTS/CAUTIONS:} \\
\normalsize
CARD ACIS-R-007 \\


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

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

{\bf V1.2}
\begin{itemize}
\item added commandEcho for all SW command packets
\item added dumpSysConfig command in step 2.2
\end{itemize}

{\bf V2.0}
\begin{itemize}
\item ACIS Team signed-off version
\item fixed typo in ``Assumed Instrument State''
\end{itemize}



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