next previous contents
Next: Guider check-list for each field
Previous: Operating the Guider

Calibration of the Guider at the Beginning of the Night

  1. Wait a few minutes after telescope power is turned on to let the autoguider cool. This takes 20 min.

  2. Step through menu, using ``adjust" to set the following values:

  3. Put the refractor mirror into ``TV" and take a dark frame.

  4. When at your first field, find a star on the refractor TV, and using the XY stage, put it precisely in the center of the grease pencil ``guider box" on the monitor.

  5. Make sure the power supply on the right of the bench is turned on. Using the switch above this supply, switch to ``guider". Press ``find and focus", and check that the brightness level is adequate but not saturated (e.g., 5-98). If it isn't, choose a different guide star or see the procedure below for changing the integration time. Move the star to , in x and y by barely tweaking the xy stage. When done, press ``interrupt" until you get the ``Hello" prompt back.

  6. Press ``calibrate". The calibrate procedure merely determines the orientation of the telescope drives with motion on the guider. It will take a minute or two, and then you will either get the ``Hello" prompt back or an error indication. If you get the error indication, you must go back to the menu and change the ``ca" to a higher value. The calibration must not have any error indication. If you make very large changes in Dec. you should do the calibrate again after you are set on a new guide star.



next previous contents
Next: Guider check-list for each field
Previous: Operating the Guider
kessel@noao.edu
Updated: 18Apr96