Contents
Bring the following tools to the Keck II Nasmyth deck in
preparation for performing the instrument reconfiguration:
- Printout of the DEIMOS reconfiguration off of the
Summit Instrument Activity Schedule (SIAS)
- Flashlight
- large flathead screwdriver (near handpaddle)
- 3/16" T-handle wrench (on leash near the handpaddle)
- 5/32 Bondhus wrench
- DEIMOS slitmasks from the instrument lab
- DEIMOS filter box (may already be on the deck beside the
instrument)
- Rotate instrument into position:
- Release the band brake at the front left of the
instrument.
- Locate the instrument handpaddle on the right side of
the instrument.
- Set the bottom switch to Manual mode.
- Set the Mode switch to 2.
- Set Position switch to 3 for
grating access.
- Press and release FWD button to rotate
instrument to the filter changeout position.
- Set the band brake at the front left-hand side of the
instrument to protect the drive box from stress during
the changeout.
- Open the access door:
- Unlock the grating access door by turning the flathead
screw 1/2 turn CCW.
- Grasp the handle and pull down to open
the access door.
- Note that the Hatch Open LED on the
handpaddle turns ON.
- Locate the grating pushbutton panel inside the access
hatch at the top right.
- Press the appropriate button (3 or 4) to bring the
desired grating to the unload position. The grating should
unclamp (producing a loud click), and the grating box should
move to the desired position. The grating will then be
rotated to the unload position, at which point you should get
a green LED lit on the pushbutton panel. The entire
process takes about two minutes. Occasionally, the move will
fail and the yellow LED will remain on. It is then necessary
to press the desired button one more time. If this
still does not produce success, contact instrument support for
assistance.
- Take a grating cover from the storage slot on the
instrument. Note that there should be two covers in the
storage slot when you start. Insert the grating cover
into the slot in the slider until it stops. Note that the
"lip" on the grating cover should point to the left.
- Unscrew the tricky captive screw on the grating mount:
- Insert the 3/16" T-handle hex wrench into the screw
head.
- Turn the screw CCW 3 turns until it spins loosely.
- The L-shaped flap onto which this screw mounts should
then flip down toward you.
- Loosen the two remaining captive screws on the grating
mount:
- Insert the 5/32 Bondhus wrench into the screw head.
- Turn screw CCW until it stops turning.
- Repeat for second screw.
- Remove the grating from the slider:
- Grasp the grating mount handle with your left hand.
- Pull the handle to your left to unseat it
from the slider.
- Carefully pull the grating toward you so that it
slides along the channel in the slider. Watch out for
the pinch point.
- Remove the grating from the instrument.
- Exchange gratings:
- Return the removed grating to the grating storage
cabinet near the elevator.
- Select the new grating to be inserted frm the
cabinet and bring it to the instrument.
- Insert the new grating into the instrument:
- Orient the grating so that the cover faces to the
left.
- Seat the grating into the slots in the slider and
push it in until it stops.
- Push the handle to the right (toward the front of the
instrument) to seat it fully.
- Attach the tricky captive screw on the grating mount:
- Insert the 3/16" T-handle hex wrench into the screw
head.
- Flip the flap up into position.
- Turn the screw CW 2-1/2 turns until it is snug.
- Tighten the two remaining captive screws on the grating
mount:
- Insert the 5/32 Bondhus wrench into the screw head.
- Turn screw CW until it it snug.
- Repeat for second screw.
- Remove the grating cover from the grating.
- Verify that the green LED is lit. If not, you'll need to
press the button again to get the grating back to the unload
position in order for the scanner to work.
- Holding the barcode scanner at the door, scan the barcode
label on the grating. Verify that the instrument responds
with a beep followed by a honk.
NOTE: if the barcode label on the grating is damaged
or unreadable, you can scan one of the grating barcode labels
on the sheet attached to the instrument. However, please scan
the label on the grating itself whenever possible in order to
ensure that the correct label is scanned.
- Repeat procedure for additional grating if needed.
- Close the hatch:
- Grasp the handle on the door and pull up to close
the access door.
- Lock the grating access door by turning the flathead
screw 1/2 turn CW.
- Note that the Hatch Open LED on the
handpaddle turns OFF.
- Verify that there are still two grating covers in the
storage slot! If not, you may have forgotten to remove one
from a grating.
- Rotate instrument into position:
- Release the band brake at the front left of the
instrument.
- Locate the instrument handpaddle on the right side of
the instrument.
- Set the bottom switch to Manual mode.
- Set the Mode switch to 2.
- Set Position switch to 5 for
filter access.
- Press and release the FWD button to rotate
instrument to the filter changeout position.
- Set the band brake at the front left-hand side of the
instrument.
- On the filter access door, unclip the latch, and slide
the door up. Note that the Hatch Open LED on the
handpaddle turns on.
- Consult the SIAS printout and determine the first filter
to change.
- On the filter wheel button panel to your left, press the
number of the filter position to change out.
- Remove a filter handle from the right side of the filter
box and attach it to the filter to be removed from the
filter wheel by screwing the thumbscrews by hand. Do not
overtighten!
- Grasp the handle and pull carefully but firmly to
disengage the filter from its detent and slide it out of the
wheel.
- Place the filter into the filter box, leaving a gap
between it an any adjacent filters if possible. Unscrew the
handle from the filter.
- In the filter box, locate the filter to be inserted into
the filter wheel.
- Attach the handle to the filter and carefully remove the
filter from the filter box.
- Insert the filter into the open slot in the filter wheel,
making sure that the arrow on the filter holder points to your
left (i.e., in the direction the photons would travel
to reach the detector).
- Push the filter into the wheel until it clicks into the
detent. Verify that the filter frame is flush with the
wheel and does not protrude.
- Remove the handle from the filter frame.
- Press the position switch to re-select the current
position.
- Wait for the position switch on the button panel
to turn green.
- Take the bar code scanner and scan the barcode label on
the filter you just inserted into the filter wheel. Verify
that the instrument responds with a beep followed
by a single, long honk.
- NOTE: if you get a beep followed by
three short honks, an error has occured. The most
likely problem is that the filter wheel is not centered on
the desired position. In this case, the green light on
the filter wheel is not lit; press the appropriate button
on the filter selector panel to return the desired
position.
- NOTE: if the barcode label on the filter is
damaged or unreadable, you can scan one of the filter
barcode labels on the sheet attached to the instrument.
However, please scan the label on the grating itself
whenever possible in order to ensure that the correct
label is scanned.
- Repeat these steps for additional filters to be changed.
- Close and latch the access door. Note that the
Hatch Open LED on the handpaddle turns OFF.
- Inspect all masks to ensure that they are acceptable for
installation. In particular, check that the masks:
- have the same shape (by laying them on top of
each other);
- have the notch cut out along the bottom edge;
- have the circle cut out along the bottom edge;
- are reasonably straight, with no more than once inch
of warp from side to side
If a mask does not meet these criteria it may jam or
otherwise cause problems during mask loading.
- Rotate instrument into position:
- Release the band brake at the front left of the
instrument.
- Locate the instrument handpaddle on the right side of
the instrument.
- Set the bottom switch to Manual mode.
- Set the Mode switch to 2.
- Set Position switch to 4 for
slitmask access.
- Press and release the FWD button to rotate
instrument to the slitmask changeout position.
- Set the band brake at the front left-hand side of the
instrument to protect the drive box from stress during
the changeout.
- Open the access door:
- Unlock the slitmask access door by turning the flathead
screw 1/2 turn CCW.
- Grasp the handle and pull down to open
the access door.
- Note that the Hatch Open LED on the
handpaddle turns ON.
- Move the slitmask cassette to the load position by
pressing the POSN 1 button on the cassette.
- Loosen the 2 thumbscrews on the cassette door and flip
the door down towards you to allow access to the masks.
- Consult the SIAS printout to determine which masks to
remove. (Note that the first occupied slot is position 2, not
1!) Remove all of the masks marked for replacement and set
them aside on a cart.
- Insert the new masks, verifying that the barcode number
on the mask matches that on the SIAS printout.
- Important notes:
- Verify that all masks are reasonably straight. Masks
which curve more than 1 inch to the left or right must be
manually "uncurled" or they will probably jam and cause a
major headache.
- Verify that masks are not cross-threaded; i.e., that
no mask crosses over into an adjacent slot.
- Flip the cassette door up and verify that slits align to
the comb. Verify that slots 1 and 13 are not occupied!
Tighten the 2 thumbscrews on the cassette door.
- Close the access door:
- Grasp the handle and pull up to open
the access door.
- Lock the slitmask access door by turning the flathead
screw 1/2 turn CW.
- Note that the Hatch Open LED on the
handpaddle turns OFF.
- Initiate slitmask scanning by picking up the barcode
scanner and scanning the SCAN MASKS item on the
COMMAND sheet.
- If no new slitmasks are to be scanned, scan the
COMMIT barcode with the scanner to
update the instrument configuration. NOTE: doing
so will cause the motor control software to be stopped and
restarted; hence, do not attempt any motor moves for at
least 2
minutes after scanning COMMIT!
- Release the band brake.
- Set the switch on the handpaddle to Computer
mode.
- Return to the control room and bring up the DEIMOS
Dashboard GUI by logging in as dmoseng and
selecting the pulldown menu option
DEIMOS Engineering > Run Dashboard GUI
- If new slitmasks were installed, complete the slitmask
scanning process as described below:
- In the Dashboard window, double-click on the
SLITMASK box to view
the slitmask panel.
- Click on dremel to launch the dremel
monitor panel.
- If slitmask scanning is required and was not already
initiated at the Nasmyth deck, click Count/Scan to count and scan masks.
- Wait while the software makes an initial pass to test
all slitmasks by inserting each one in turn, and then a
second pass (in the reverse direction) to read
barcodes. The process should take about 13 minutes.
- When scanning is completed, DREMSCAN will
read, for example:
Done at Fri Sep 06 14:18:42 HST 2002
- Compare the list of scanned barcodes
(DREMBARS field) to the expected list on the
SIAS printout to verify that the proper filters were
installed.
- Verify that the DREMJAMS field is empty,
indicating that no slitmasks jammed during the count
phase. If jams occurred, ask summit tech to
investigate whether slitmasks were cross-loaded in the
cassette.
- If scanning succeeded, the software will then
generate the FITS database files. When completed,
DREMFITS will read, for example:
Completed around Fri Sep 06 14:25:12 HST 2002
- Click Review Config to
launch a tkremel popup window which shows the
configuration which will be registered when you
commit the changes. NOTE: this GUI occasionally
lies on the first attempt; if the configuration does not
seem to have changed, kill the tkremel popup by
clicking its Quit button, then
click Review Config once more.
If the pending configuration changes shown this new
tkremel popup window are correct, then click
its Quit button and continue to
the next step. If not, you have a problem and need to
investigate further.
- When you are convinced that the pending changes are
correct, effect the change by clicking on COMMIT!. This will cause the
database to be updated and the dispatchers to be
restarted, and takes about one minute to complete.
When finished, DREMCMIT will read, for example:
Completed around Fri Sep 06 14:42:51 HST 2002
- Shutdown and restart the Dashboard GUI.
- Double-click on the SLITMASK box to view the
slitmask panel. Verify that the slitmask names (which are
displayed in reverse order match the observer's
request on the SIAS printout. If any names are
UNKNOWN, see instructions below.
- Double-click on the GRATING box to view the
grating panel. Verify that the gratings in positions 3 and
4 match the observer's request on the SIAS printout.
- Double-click on the FILTER box to view the
filter panel. Verify that the filters match the observer's
request on the SIAS printout.
- When to COMMIT. Scan or click on COMMIT
only after all filters, gratings, and slitmasks have been
changed out, scanned, and DREMELED. Running
COMMIT takes several minutes and causes the motor
control software to be stopped and restarted, so it should
only be done at the end of a session. Specifically, if you
COMMIT while DREMEL is scanning masks,
the slitmask cassette will stop moving and DREMEL
will fail! In this case, you may need to call for help in
order to get DREMEL restarted.
- When to use alternate barcodes. Each filter and
grating has a barcode on it which uniquely identifies it. In
case these are damaged or lost, a laminated sheet taped to the
instrument provides substitute barcodes that can be used.
Use these only if the original barcodes are not
usable. If a barcode is damaged, then do the following:
- Open the access hatch (filter or grating) as if you
were going to scan the barcode on the filter or grating.
- Scan the appropriate substitute barcode.
- Verify that a beep/bonk sequence is received.
Note that the substitute barcodes will not work if the
appropriate access hatch is closed. This is a safety
feature to prevent accidental scanning of barcodes.
- Jammed slitmasks.
TBD.
- Unknown masks.
If a reported slitmask name is of the
form UNKNOWNn, then the database does
not have knowledge of the barcode number. It is first
necessary to contact De Clarke at UCO/Lick to sync up the
databases. Then one must select the dremel command
readDB to re-read configuation information, then
commit, restart dispatchers, restart Dashboard,
etc.
Here is a detailed description of a typical DREMEL session in
which slitmasks are scanned and the resulting configuration is
committed.
- The starting state for DREMEL. This is what the
screen should look like when you begin a DREMEL session.
- Verifying comminication. Click on the
Hello? button (at bottom) to verify that DREMEL is
responsive. If you get the Hello! response back at
the top, DREMEL is active and you can proceed. If not,
contact support.
- Launch Count/Scan. Click on the
Count/Scan button to start the slitmask process.
The following should happen on the GUI:
- Top message changes to Counting Masks.
The software will now start cycling through all slitmask
positions, attempting to insert and retract each mask. This
verifies which mask slots are occupied and which are empty,
and also tests whether slitmasks jam.
- Verify counting. When the count is completed, the
software reports it progress:
- DREMPTYS lists any slots
which don't have masks.
- DREMPOPS lists all slots
populated with masks.
- DREMJAMS lists any slots in which slitmasks
jammed. See troubleshooting notes above if any masks jam!
- Start scanning. If you scanned SCAN
MASKS at the instrument or clicked Count/Scan
on the GUI, DREMEL will start scanning barcodes
automatically as soon as counting is done (assuming no errors
were encountered). If you clicked Just Count, then
you need to click on Just Scan to initiate the
scanning process. DREMEL will turn on the
barcode scanner and begin reading mask barcodes.
- Verify scanning. After all barcodes have been
scanned, the normal result is:
- Top message reads Ready
- DREMSCAN reads Done at (date)
- DREMESAG reads Completed
command 'scan' (scanMasks)
- DREMBARS contains the list of scanned
barcodes, which should contains the same number of
items as the DREMPOPS list.
You may also notice messages about the FITS writer being
started; this is normal.
- Review configuration. Before committing changes,
verify that what you put in is what was called for on the
SIAS. Click on Review Config to pop up the
tkremel tool which you will use to review the
list.
- Check the filters, which are listed on the top menu.
- Click on the Gratings tab and check the
gratings.
- Click on the Mask/kbd> tab and check the
slitmasks.
Note: you will usually get old information on the
first attempt. If so, simply click on the Quit
at the bottom of the tkremel popup to dismiss the
tkremel window, and click Review
Config again on the dremel panel to
bring it up again. If information still doesn't match,
then something went wrong in the DREMELing
process.
- Commit changes. Complete the reconfiguration by
clicking on COMMIT. This will cause the new
configuration to be written into a log file, and the motor
control software to be restarted so that it re-reads the
logfile and knows which elements are in which positions.
The GUI gives the following feedback:
- DREMEVNT reads "Forked off confio (COMMIT)
process".
- DREMESAG reads "Completed command 'commit'
(commitCfg)"
- DREMCMIT reads "in progress" and then goes
to "completed around (date/time)".
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Last modified: Tue Apr 11 14:13:52 HST 2006
