Subject: Re: [sloan-25mlog 6864] 2.5m obslog 20231005 (SJD 60223)
From: Conor Sayres
Date: Fri, 6 Oct 2023 10:12:46 -0400
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Again, I=E2=80=99d prefer you just leave collimation on, and use the tcc =
set foc=3DX.  Keeps the headers cleaner for analysis, and I think =
collimation on should be fine if you pick a low airmass for the test.
> On Oct 6, 2023, at 10:08 AM, Kaike  wrote:
>=20
> Dan is right. =E2=80=9CTcc set foc=3Dx=E2=80=9D command will be sent =
but will not be execute if collimate process is disabled. One can adjust =
focus from telnet session to M2 or tcc talk command.
>=20
>> On Oct 6, 2023, at 7:43 AM, Daniel Oravetz > wrote:
>>=20
>>> - Conor ordered a test tonight, other than the full rotator scan.
>>> Results of the test are puzzling. In the course of its execution
>>> we were unable to obtain donuts even with +/- 1600 focus steps from =
the
>>> best focus! The actual piston move and focus change was confirmed
>>> via MCP. More exactly: M2 A,B,C are somewhere in the middle of their
>>> range
>>> (some 4.8M out of [0, 7.5M]). The axes were tracking. The focus was
>>> changing in the STUI "Secondary Focus" widget.
>>> I pushed the +/- 500 steps range to +/-1600. Afraid to apply a =
bigger
>>> range
>>> to not let the focus drive to Mexico or Canada - I don't have right
>>> customs papers for it.
>>> See log for details and for the guider exposures.
>>=20
>> I think this is a result of the Collimate process being disabled =
before
>> the focus sweep. Here's a note from the optical collimation procedure
>> where we run into the same kind of thing (i.e., we need to enable
>> Collimate to adjust M2 focus in the normal way with the TCC, but then =
turn
>> Collimate off when we want to resume with tilts):
>>=20
>> "The telescope needs to be in the "Collimate enabled" state in order =
to
>> change the secondary focus (although using a telnet session connected =
to
>> the M2 controller and adjusting piston with an M2 'move' command =
should be
>> possible irrespective of the Collimate status)."
>>=20
>> Dan
>>=20
>> ____________________________________________________________
>> Logs of Nightly APO Activities
>> =
https://trac.sdss.org/tracmailman/browser/private/sloan-25mlog/index.html
>=20
> ____________________________________________________________
> Logs of Nightly APO Activities >
> =
https://trac.sdss.org/tracmailman/browser/private/sloan-25mlog/index.html
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Again, I=E2=80=99=
d prefer you just leave collimation on, and use the tcc set foc=3DX. =
 Keeps the headers cleaner for analysis, and I think collimation on =
should be fine if you pick a low airmass for the =
test.On Oct 6, 2023, at =
10:08 AM, Kaike <kpan@apo.nmsu.edu> wrote:Dan is right. =E2=80=9CTcc set foc=3Dx=E2=80=9D=
 command will be sent but will not be execute if collimate process is =
disabled. One can adjust focus from telnet session to M2 or tcc talk =
command.On Oct 6, 2023, at 7:43 AM, Daniel Oravetz =
<doravetz@apo.nmsu.edu>=
 wrote:- Conor ordered a test tonight, =
other than the full rotator scan.Results of the test are puzzling. =
In the course of its executionwe were unable to obtain donuts even =
with +/- 1600 focus steps from thebest focus! The actual piston move =
and focus change was confirmedvia MCP. More exactly: M2 A,B,C are =
somewhere in the middle of theirrange(some 4.8M out of [0, =
7.5M]). The axes were tracking. The focus waschanging in the STUI =
"Secondary Focus" widget.I pushed the +/- 500 steps range to =
+/-1600. Afraid to apply a biggerrangeto not let the focus drive =
to Mexico or Canada - I don't have rightcustoms papers for =
it.See log for details and for the guider =
exposures.I think this is a result of the Collimate =
process being disabled beforethe focus sweep. Here's a note from the =
optical collimation procedurewhere we run into the same kind of =
thing (i.e., we need to enableCollimate to adjust M2 focus in the =
normal way with the TCC, but then turnCollimate off when we want to =
resume with tilts):"The telescope needs to be in the "Collimate =
enabled" state in order tochange the secondary focus (although using =
a telnet session connected tothe M2 controller and adjusting piston =
with an M2 'move' command should bepossible irrespective of the =
Collimate =
status)."Dan______________________________________________=
______________Logs of Nightly APO Activities =
<sloan-25mlog@sdss.org>https://trac.sdss.org/tracmailman/browser/private/sloan-25mlog/in=
dex.html____________________________________________________________Logs of Nightly APO =
Activities <sloan-25mlog@sdss.org>https://trac.sdss.org/tracmailman/browser/private/sloan-25mlog/index=
.html=
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