From: stephanie snedden
Subject: Re: 2.5m obslog 20080201 (MJD 54498)
Date: Sat, 2 Feb 2008 11:30:22 -0700
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This is a pretty strange behavior. I'm guessing the problem lies with
the MCP interpreting the TCC commands to slew. This afternoon, please
reboot the MCP first thing as part of afternoon checkout. If you have
trouble with the MCP coming up properly, call Jon.
> 01:03Z - On Dmitry's initial gotoField, the telescope didn't
> actually begin
> slewing to the field until after about a five minute delay.  After
> about a
> minute or so, the SOP window finally began replying that it thought
> the slew
> had started when in fact the telescope was not moving.  After
> another few
> minutes the telescope actually began to slew.  A TCC connection had
> been
> established prior to issuing the gotoField command.  We experienced
> a similar
> problem yesterday evening on the initial gotoField slew where the
> slew was
> delayed and a TCC connection had already been established.  The TCC
> didn't
> time out yesterday (nor today), there was just a waiting period
> before the
> telescope began to move.
>
Getting just a couple of guide stars is usually related to a large
rotator offset. That could easily have happened with the strangeness
of the slewing. Keep an eye in the murmur log for dsc_E_trcErr
messages in the murmur log, which indicate problems between the MCP
and MEI fiducial crossing interpretation.
> After it stopped slewing and began tracking, we did not see
> guide stars.  We re-issued the loadCartridge and gotoField commands
> and still
> did not find guide stars, but the subsequent fk5 was found in fiber
> 10.  We
> centered the fk5 star and went back to the field only to find two
> guide stars,
> at the edges of fibers 10 and 11.  Starting the guider centered
> these stars
> and brought all of the guide stars into the centers of their
> respective guide
> fibers.  Usually a centered fk5 star will produce more than just
> two guide
> stars on the return-to-field gcam exposure, so it seems as though
> there is an
> offset between the guide stars and the centered fk5 in fiber 10 for
> this
> plate.  Is this perhaps because this plate formally expired just
> over two
> weeks ago?
>
Steph
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This is a pretty strange behavior. I'm =
guessing the problem lies with the MCP interpreting the TCC commands to =
slew. This afternoon, please reboot the MCP first thing as part of =
afternoon checkout. If you have trouble with the MCP coming up properly, =
call Jon.01:03Z - On Dmitry's initial gotoField, the =
telescope didn't actually begin=A0slewing =
to the field until after about a five minute delay.=A0 After about a=A0minute =
or so, the SOP window finally began replying that it thought the =
slew=A0had started when in fact the telescope was not =
moving.=A0 After another =
few=A0minutes the telescope actually began to slew.=A0 A TCC connection had =
been=A0established prior to issuing the gotoField =
command.=A0 We experienced =
a similar=A0problem yesterday evening on the initial gotoField =
slew where the slew was=A0delayed =
and a TCC connection had already been established.=A0 The TCC didn't=A0time out =
yesterday (nor today), there was just a waiting period before the=A0telescope began to move.Getting just a couple of guide stars is usually =
related to a large rotator offset. That could easily have happened with =
the strangeness of the slewing. Keep an eye in the murmur log =
for=A0dsc_E_trcErr messages in the murmur log, which =
indicate problems between the MCP and MEI fiducial crossing =
interpretation.After it stopped slewing and began tracking, we did =
not see=A0guide stars.=A0 =
We re-issued the loadCartridge and gotoField commands and =
still=A0did not find guide stars, but the subsequent fk5 was =
found in fiber 10.=A0 =
We=A0centered the fk5 star and went back to the field =
only to find two guide stars,=A0at the =
edges of fibers 10 and 11.=A0 =
Starting the guider centered these stars=A0and =
brought all of the guide stars into the centers of their respective =
guide=A0fibers.=A0 =
Usually a centered fk5 star will produce more than just two =
guide=A0stars on the return-to-field gcam exposure, so it =
seems as though there is an=A0offset =
between the guide stars and the centered fk5 in fiber 10 for this=A0plate.=A0 Is this perhaps =
because this plate formally expired just over two=A0weeks =
ago?Steph=
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