There are 2 ways to perform a "coma free" pointing offset moving the AdSec hexapod:
  1. using the TCS GUI
  2. using the ARGOS terminal

How to perform a pointing offset using the TCS GUI

  1. Login on obs[x] as LBTO. See UsefulLoginInfo
  2. Start OSSGUI right (or left)
  3. Click on the icon of the M2 (right or left) to open the hexapod command window
  4. Write now the 6 numbers in the Absolute position line: this is where you need to move back in case you get lost
  5. Write zero in the 6 fields of Move Relative line.
  6. To perform a tip=10'' of X pointing offset write X=+0.505mm and RY=+98" (values calibrated from Zemax model). Click on Set Reference and then on Move Relative.
  7. To perform a tilt=10'' of Y pointing offset write Y=-0.505mm and RX=+98". Click on Set Reference and then on Move Relative.
Note: a 1" Rx or Ry movement corresponds to 0.22" movement on-sky

Always click on Set Reference first and then on Move Relative

How to perform a pointing offset using the ARGOS terminal

  1. Open an ARGOS terminal and type:
from argos.arbitrator.tcs.hexapod_controller import Pointing
offset= Pointing.fromNumPyArray(np.array([xxx, yyy]))
Remember that the xxx and yyy offsets are expressed in arcsec on-sky.

-- LorenzoBusoni - 04 Nov 2014

This topic: ARGOS > WebHome > HowToDoComaFreePointingOffset
Topic revision: 10 Mar 2016, MarcoBonaglia
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