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\centerline {\bf 2.5\_V2.0 BEP/DEA Power Combinations } 
\vspace{0.25in}

\normalsize
\noindent{\it Last Revised: June 27, 1999}\\

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

This activity tests the operation of the DPA Sides A and B in combination
with the DEA Side A This activity is based on the ACIS Long Form
Functional Procedure (see MIT Document 36-01301.01 Rev. E).

The activity consists of the following main steps:
\be
\item
Turn off both sides of the DPA, turn on DPA A and verify BEP A boot
\item
Power up I0,I1,I2 video boards and FEPS and perform a science run and 
check the power levels while clocking only I0,I1,I2.
\item
Power off all boards and check power, power off DPA A.
\item
Power on DPA Side B, select BEP B and boot, check power levels
\item
Power up I3,S2,S3 video boards and FEPS and perform a 2nd science run 
and check power levels while clocking only I3,S2,S3.
\item
Power off all boards and FEPs
\item
Switch back to BEP A in charge \\
\ee

The behavior of the system is verified using: engineering voltage
and current measurements; command echoes; the DEA housekeeping values
obtained at the start of each science run; and the science reports.
This procedure has been modified from the thermal vac procedure to
leave the DEA A on throughout the procedure in order to preserve the
control of the focal plane temperature.

\vspace{0.15in}
\normalsize
\noindent {\bf ASSUMED INSTRUMENT STATE:} \\
\normalsize
Assumes the instrument starts in the canonical thermal standby state.\\
%This assumes that both DPA Side A and Side B are on, with
%the Side A BEP running an unpatched version of the flight software.
%It also assumes that only DEA Side-A is on. If not consult other
%procedures. \\

%\vspace{0.25in}
\normalsize
\noindent {\bf SPECIAL INITIAL CONDITIONS:} \\
\normalsize
Spacecraft telemetry is desired to be in Format 2 during the science runs. \\

%\newpage 

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\normalsize
\noindent {\bf OPERATIONAL CONSTRAINTS/CAUTIONS:} \\
\normalsize
This procedure will remove patches in both BEPs.\\
This procedure power-cycles DPA boards and will vary the
power consumption of ACIS during the execution of the procedure. \\

\vspace{0.15in}
\normalsize
\noindent {\bf REFERENCES:} \\
\normalsize
ACIS Long Form Functional Procedure - MIT Document 36-01301.01 Rev. E

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

{\bf V1.2}
\begin{itemize}
\item removed commands which powered-down and powered-up DEA A in
previous steps 1.3,1.4, 1.11,1.12,3.3,3.4,4.3,4.4,6.3,6.4,7.3 and 7.4
\item added commands to select BEP B and then do a warm boot in steps
4.3-4.6
\item updated text description to indicate the procedure preserves
thermal control of the focal plane
\end{itemize}

{\bf V1.3}
\begin{itemize}
\item deleted commands in old step one to power down video boards and
FEPs
\item changed HW TLM verifiers for the DPA off and on in steps 1.1,
1.3 and 1.6
\item added steps 1.7, 1.8, 1.9 to verify BEP A boot
\item added commandEcho values for all the SW command packets
\item changed HW TLM verifiers in steps 3.3 and 3.4 to verify that DPA
A is off
\item changed HW TLM verifiers in steps 4.1 and 4.2 to verify that DPA
\item added steps 4.7 and 4.8 to verify that BEP B boots
\item modified step 7 to switch back to BEP A without powering down
DPA B
\end{itemize}

{\bf V2.0}
\begin{itemize}
\item ACIS Team signed-off version
\item changed expected value of ``1STAT7ST'' in steps 1.8,4.7, and 7.6
\end{itemize}


\newcommand{\tablecaptiontext}{ACIS DPA/DEA Power Combination Test}
\input{power_combo.tab}

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