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\large
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\centerline {\bf 1.14\_V2.0 RAW DATA FROM EACH CCD } 
\vspace{0.25in}

\normalsize
\noindent{\it Last Revised: June 27,1999}\\
\noindent{\bf Filename: raw\_data} \\

\noindent {\bf BRIEF FUNCTIONAL DESCRIPTION:} \\
\normalsize
ACIS allows raw pixel data (without bias subtraction or event
recognition) to be telemetered from the instrument.  These data are
a highly useful diagnostic.  Unfortunately, these data consume a large
amount of telemetry.  For example, one full frame of raw data takes
$\sim8$ minutes to telemeter with no compresion at 24~kbs and $\sim3$
minutes to telemeter with a compression factor of 2.5 at 24~kbs.  
Therefore, these data will be
collected infrequently.  We plan to collect two raw frames from each
CCD early in the OAC phase.  These data will immediately alert us to any
serious problems with the instrument performance and will be used
as the baseline to which future data will be compared.
This procedure also includes two short science runs with all 10 video
boards powered-up so that accurate values of the clock bias voltages
may be obtained.

\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 all video
boards up to check the clock biases
\vspace{-0.10in}
\item execute a short science run to get the clock biases
\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 2 raw frames per CCD, including
a dump of all the configuration information
\vspace{-0.10in}
\item configure the instrument to collect spectroscopy array data with
all video boards up
\vspace{-0.10in}
\item execute a short science run to get the clock biases
\vspace{-0.10in}
\item configure the instrument to collect spectroscopy array data with
6 video boards up
\vspace{-0.10in}
\item execute the science run, collect 2 raw frames per CCD, including
a dump of all the configuration information
\vspace{-0.10in}
\item reconfigure back to the thermal standy state if necessary
\vspace{-0.10in}
\ee


\vspace{0.15in}
\normalsize
\noindent {\bf ASSUMED INSTRUMENT STATE:} \\
\normalsize
Assumes the focal plane temperature is -90~C (or thereabouts).\\
Assumes that the instrument is in the canonical thermal standby state
except for an elevated focal plane temperature.\\
Assumes the standard patches are loaded.\\


%\vspace{0.25in}
\normalsize
\noindent {\bf SPECIAL INITIAL CONDITIONS:} \\
\normalsize


%\newpage 

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


\vspace{0.15in}
\normalsize
\noindent {\bf REFERENCES:} \\
\normalsize


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

{\bf V1.2}
\begin{itemize}
\item changed filenames from ``ccd\_raw'' to ``raw\_data''
\end{itemize}

{\bf V1.3}
\begin{itemize}
\item changed step 1 to load a DEA HKP PB and start a DEA HKP run if
necessary
\item added a new step 2 which powers up all 10 video boards so that
calibrated DEA HKP data may be collected with the imaging array
\item added the HW TLM verifiers for the expected DEA and DPA power
consumption in step 2
\item added a short science run in step 3 to measure the video offsets
\item added a command to power-up only imaging array video boards in
step 4
\item put the dump of the configuration information after the start
science run command in step 5
\item added a new step 6 which powers up all 10 video boards so that
calibrated DEA HKP data may be collected with the spectroscopy array
\item added a short science run in step 7 to measure the video offsets
\item added a command to power-up only spectroscopy array video boards in
step 8
\item put the dump of the configuration information after the start
science run command in step 9
\item added a step 10 to reconfigure the instrument into a thermal
standby state if necesary
\item added commandEcho values for all SW command packets
\item added filename identification at top of procedure
\end{itemize}

{\bf V1.4}
\begin{itemize}
\item changed expected values of the DPA A \& B and DEA A input
voltages to 28.0--34.0~V in steps 2.1, 2.2, 10.4 and the DPA A \& B
and DEA A input currents in the same steps
\item added command echo value in step 2.1
\item added comment in steps 3.2 and 7.2 to wait for at least one
exposure record before terminating the science run
\item changed duration of science run in step 7.2 to 10 minutes
\item changed comments in steps 2, 3, 3.4, 6, 7, 7.4 to say ``clock
biases'' instead of video offsets
\item edited Brief Functional Description to be consistent with the
table of commands
\item changed PB mnemonics in steps 3.2,5.2,7.2,9.2
\item added new steps 5.3 and 9.3 to load a 2D window PB
\end{itemize}

{\bf V2.0}
\begin{itemize}
\item ACIS Team signed-off version
\item added comment in step 10.3 to verify that FEPs and video boards
are off
\end{itemize}

\newcommand{\tablecaptiontext}{Collect Raw Mode Data Procedure}
\input{raw_data.tab}

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