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How to take Inclinometry Data
How to take Inclinometry Data
The short version: to do a combined CW + CCW run
- Logon to palila as OPERATOR
- drama_nuke
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Turn off the SMU Crown amplifiers in the software (follow this link for instructions)
- tcs
- Turn on all the drives - carousel at the Bradley and the azimuth and elevation drives at the AEC
- Set the AEC to remote control
- Inform personnel to remain off the antenna for about 6 hours.
- Put out the 'Inclinometry in progress' board on the carousel floor
- incline load
- incline init
- incline centre 10:00:00.0 88:46:30
- Wait 15-20 minutes
- incline az_file azFileCwCcw.dat
- incline run filename 4 2 - supply filename in
format incyyyymmdd
- incline kill - when finished
Notes
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These instructions apply particularly to the taking of full-circle
inclinometry, but may be adopted and adjusted for other inclinometry work.
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A method for producing customized az_files is described
here .
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Ensure the switches on the inclinometers are set to FILTER=OFF,
GAIN=LOW.
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Having trouble?
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Doing remote work? IMPORTANT - read these...
Complete Instructions
- Start the software from scratch !
- Logon to palila as OPERATOR
- Open a terminal window on palila and enter the following commands at
the unix prompt:
- Wait for the LST on the GUI to begin updating
before proceeding to next step.
- Turn on all the drives and engage computer control
- Inform personnel to remain off the antenna for about 3 hours.
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- Start up the inclinometry software
- incline load
- incline init (repeat if initialise.xml is
changed during the session)
- Position the antenna:
- incline centre deg:mm:ss.s 88:46:30 where
- deg:mm:ss.s is 10:00:00.0 for CW runs or 440:00:00.0 for CCW runs
- EN-coder coordinates are assumed
- Wait 15-20 minutes - this allows the TMU inclinometer to recover
from the shake-up it received from the elevation slew.
- Test the system before embarking upon 3 hours of data-taking :
- incline log test.log 1
- incline log_cancel
- more /jcmtdata/raw/incline/{HSTdate}/test.log
- if channels 1 2 4 5 7 8 show readings less than 1000 in modulus,
and show sensible noise variations, then proceed to the next step.
If channel 2 (TY)
is +9999 the antenna elevation is too low; if TY is -9999 it is
too high - adjust elevation in the appropriate direction by 10
arcminutes. Otherwise divide the
reading by 20 and adjust the elevation by this number of arcseconds.
Repeat the centre, log and more commands.
Other channels showing excessively non-zero readings may need
zero-point adjustments which will require technical assistance.
- (T) If channel 1 (TX) is greater than 1000 in
modulus you should adjust
x_pos by -1 unit for every +400mV error in TX. However, it may be
best to avoid attempting to perfectly level the inclinometer in the
X-axis via the TMU task : such move_to commands will force an
initialization of the Y-axis, costing further settling time.
- (T) If channel 2 (TY) is greater than 1000 in
modulus you could adjust
y_pos by -1 unit for every +600mV error in TY.
- Repeat the 3 commands in bold above - watch for zero-point
drifts, especially in Channel 2.
- It may take 10-15 mins after last slew before all channels are
stable.
- Define the azimuths to be used during the run . . . and execute the
run :
- incline az_file azFileCw.dat - or azFileCcw.dat for CCW runs,
or azFileCwCcw.dat for both together.
- incline run incdata 4 2
- you can replace the filename incdata by
(e.g.) inc20060823
(i.e. today's (HST) date) - that would be useful
for bookkeeping purposes.
- the 4 and the 2 are the wait time and sample (integration) time
(seconds)
- The command to cancel the run is incline run_cancel.
- please e-mail me that you've taken some new data.
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Shutdown the inclinometry system
- Kill the TCS software - this is important
- From the TCS window press Enter , and type exit
- Logout of all windows
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