How to take Inclinometry Data

The short version: to do a combined CW + CCW run

• Logon to palila as OPERATOR
• drama_nuke
• Explicity turn off the SMU Crown amplifiers
• tcs
• Turn on all the drives and engage computer control
• Inform personnel to remain off the antenna for about 6 hours.
• incline load
• incline init
• incline centre   10:00:00.0   88:46:30
• wait 10-15 minutes
• incline az_file azFileCwCcw.dat
• incline run filename 4 2 - supply filename in format incyyyymmdd
• incline kill - when finished

Notes :

• These instructions apply particularly to the taking of full-circle inclinometry, but may be adopted and adjusted for other inclinometry work.
• A method for producing customized az_files is described here .
• Use of the 'fixed' TMU inclinometer (mounted beneath the TMU platform) is assumed.
  Instructions for using a TMU-tiltable inclinometer are prefaced by (T) (ignorable for now : imc/20060717).
• Ensure the correct TMU inclinometer is plugged into the A/D circuitry box located to the right of the TMU micro.
  Ensure the switches on the inclinometers are set to FILTER=OFF, GAIN=LOW.

• Having trouble ?
  • see trouble-shooting guide.
• Doing remote work ?
  • read the
    • Safety Notice
    • protocols
    • remote-specific 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:
  • drama_nuke (although this is done automatically anyhow)
  • tcs
• 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.
• Start up the inclinometry software
  • incline load
  • incline init     (repeat if initialise.xml is changed during the session)
• (T) From another terminal window start the TMU GUI : tmuDisp
  The levelling of the inclinometer is achieved using the following :

  elevation (EN coords)	xxxx	yyyy
  10	19594	01063
  20	19591	02061
  30	19588	03063
  40	19586	04063
  50	19586	05063
  60	19587	06065
  80	19618	08073

  
  i.e. TMU units are approx 0.01^o.
  For AZ coordinates : add 3 steps to y-pos
  Updated 2002 03 06 : (-45,+83) from earlier values

   

• 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
    • (T) when using the tiltable inclinometer the choice of elevation should match y_pos (yyyy) chosen above.
• wait 10-15 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.
• (T) Following a normal completion, shutdown the TMU GUI by clicking on the medm icon on the toolbar and 'exit'.
• Shutdown the inclinometry system
  • incline kill
• Kill the TCS software - this is important
  • From the TCS window press Enter , and type exit
  • Logout of all windows