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:
   • EA=3.0 [Exposure adjust]
   • b=1 [Gain boost] (default)
   • bA=A [Star brightness adjust (Average or Faint)] (default)
   • SA=3 [Scintillation adjust]
   • FL=L [Focal length of telescope (Long or Short)]
   • C1=15 [Calibration time x axis]
   • C2=15 [Calibration time y axis]
   • H1=3 [Hysterysis X axis in tenths]
   • H2=3 [Hysterysis y axis in tenths]
   • AA=2 [Averaging adjust (number of cycles to average)
   • AL=2 [Number of cycles between alarm beeps]

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.