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%\input dspace12.tex
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\large
%\vspace*{-0.5in}
\centerline {\bf 1.27\_V2.1 RAW MODE DATA FOR BIAS ALGORITHM OPTIMIZATION }
\vspace{0.25in}

\normalsize
\noindent{\it Last Revised: July 29, 1999}\\
\noindent{\bf Filename: raw\_bias} \\

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

ACIS allows raw pixel data (without bias subtraction or event
recognition) to be telemetered from the instrument.  Unfortunately,
these data consume a large amount of telemetry.  For example, one full
frame of raw data takes $\sim9$ minutes to telemeter with no
compression at 24~kbs and $\sim4$ minutes to telemeter with a
compression factor of 2.5 at 24~kbs.  Therefore, these data will be
collected infrequently.  This procedure collects at least 26 raw
frames each from CCDs S2 and S3 late in the OAC transfer orbit phase.
These data will be used on the ground to optimize the bias algorithm
to exclude charge produced by cosmic rays and X-rays from the bias
maps.  These data are essential since the predominant cosmic-ray
species on orbit (protons) is much more massive and energetic than at
ground level (muons), and the on-orbit flux is much higher.

\vspace{0.25in}
\noindent The sequence of actions will be: 
\be
\item start a DEA HKP run if necessary
\vspace{-0.10in}
\item configure the instrument to collect imaging array data with 6 video
boards up
\vspace{-0.10in}
\item execute the science run, collect 26 or more raw frames each from CCDs S2 and S3, including a dump of all the configuration information
\vspace{-0.10in}
\item reconfigure back to the thermal standby state if necessary
\vspace{-0.10in}
\ee


\vspace{0.15in}
\normalsize
\noindent {\bf ASSUMED INSTRUMENT STATE:} \\
\normalsize
Assumes the focal plane temperature is -120~C.\\
Assumes the instrument is in the canonical thermal standby state.\\
%except for an elevated focal plane temperature.\\
Assumes the standard patches are loaded.\\
Assumes the sw\_teignore optional patch is loaded, sw version = 28.\\
Assumes no other optional patches are loaded.\\

%\vspace{0.25in}
\normalsize
\noindent {\bf SPECIAL INITIAL CONDITIONS:} \\
\normalsize
Procedure 1.26\_V2.0 must have been executed prior to running this procedure to reset the patch list and then load the ``Standard'' and ``TE Ignore Initial Frames'' patches.\\
Assumes the spacecraft is in TLM FMT 2 throughout the procedure to telemeter the raw frames in a reasonable amount of time.\\

%\newpage 

%\vspace{0.25in}
\normalsize
\noindent {\bf OPERATIONAL CONSTRAINTS/CAUTIONS:} \\
\normalsize

\vspace{0.25in}
\normalsize
\noindent {\bf SPECIAL FINAL CONDITIONS:} \\
\normalsize
Procedure 1.12\_V2.0 should be executed after this procedure to remove the ``TE Ignore Initial Frames'' patch and to reload the ``Standard'', ``Event Histogram'', and ``CC 3x3 '' patches.\\


%\vspace{0.15in}
\normalsize
\noindent {\bf REFERENCES:} \\
\normalsize
\be
\item MIT 36-58010, Standard Patch Release, Rev. A
\item MIT 36-58020, Optional Patch Release, Rev. A
\ee


\vspace{0.15in}
\normalsize
\noindent {\bf CHANGE HISTORY:} \\
\normalsize

{\bf V1.0}
\begin{itemize}
\item Initial version, copied from the procedure ``Raw Data from Each CCD'' (raw\_data), 1.14\_V2.0
\item Revised the procedure title, date, and filename
\item Revised the brief functional description
\item Revised the sequence of actions
\item Revised the assumed instrument state
\item Added a special initial condition specifying that the procedure ``Flight Software TE Ignore Initial Frames'' patch (sw\_teignore), 1.26\_V2.0 must have been executed prior to running this procedure
\item Added a special initial condition that the spacecraft must be in TLM FMT 2 throughout this procedure
\item Added a special final condition specifying that the procedure ``Flight Software Event Histogram and CC 3x3 Patch'' (sw\_evhcc3x3), 1.12\_V2.0 must be
executed immediately after this procedure
\item Added two references
\item Deleted the old steps 2, 3, 6--9
\item Renumbered the old steps 4, 5, \& 10 to 2, 3, \& 4, respectively
\item Edited step 2 to power up all FEPs and the imaging array video boards
\item Revised the command mnemonics, command echos, and description fields in steps 3.1 and 3.2
\item Revised the time estimates in steps 3.15 and 3.17
\item Revised the description and set Real-Time Contact to ``Y'' in step 3.15
\item Revised step 4 to return to thermal standby mode only if necessary
\item Changed the ``DEA Input V A'' mnemonic in step 4.3 from ``1DEP3AVO'' to ``1DE28AVO''
\item Revised the table caption
\item Changed the Latex command \\input\{raw\_data.tab\} to \\input\{raw\_bias.tab\}
\end{itemize}

{\bf V1.1}
\begin{itemize}
\item Updated the version number and revision date
\item Changed text ``must be executed immediately after'' to ``should be executed after'' in the special final condition
\item Changed time delays to 0.1 min in steps 3.1, 3.2, 3.3, and 4.1
\item Changed TLM Criterion from ``A'' to ``B'' in steps 3.1, 3.2, 3.3, 3.16, and 4.1
\end{itemize}

{\bf V2.0}
\begin{itemize}
\item ACIS team signed-off version
\end{itemize}

{\bf V2.1}
\begin{itemize}
\item changed command ID in step 3.1 from ``1192'' to ``1212''
\end{itemize}

\newcommand{\tablecaptiontext}{Collect Raw Mode Data for Bias Algorithm Optimization Procedure}
\input{raw_bias.tab}

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