[evlatests] Holography Phase Oddities

[Ken Sowinski]

On Fri, 12 Oct 2007, Rick Perley wrote:

>    1)  All looks normal for the calibration scans (except that the last
> calibration scan wasn't observed -- see the explanation later).   There
> are no 'global' phase jumps between the EVLA and VLA.
>    2) For every holographic scan, every EVLA antenna (both the
> 'reference' and 'moving') had its phase jump, on all IFs, on the second
> ten-second observation.  This is not a 'global' jump between the two
> arrays (EVLA and VLA) -- the phase jump on each EVLA antenna is
> different than on any other.  The jump is the same between IFs A and C,
> and between IFs B and D.  The phase jump on IF1 is different than on IF
> 2.  The phase returns to the correct value on the third ten-second
> record.  No other jumps are seen.

This sounds like an L302 command is sneaking out with a wrong
effective time.  Barry may have a better idea.

>          The executor ignored all my commanded stop and start times.
> On its own accord, it decided not to honor my requested extra time for
> each holographic scan, and essentially made up a new file with no padded
> time added -- it executed each holography scan in the minimum time
> possible (10 seconds per requested point).  However, this override did
> not happen for the calibration scan -- the full duration was given, even
> though the scan was not at the time requested.  Because of the removal
> of the extra times, the file ended 4 minutes and 40 seconds early.

I believe this is the expected behavior.  The system goes
on to the next scan at the earlier of the LST stop time or
the finish of the execution of the requested holography scan.