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5.3 Set-up Checklist

Observers are usually assisted with the setup of the instrument during the first afternoon and evening of a run. Below is a list to serve as a reminder of possible things to do:

  1. Bring up the TCS computer and the comparison window (see above).

  2. Log out of the ICE windows, do an obsinit at the UNIX level, log out and then back in.

  3. Type detpars and reformat the detector to 1-3072 columns, and 130-330 rows.

  4. Type instrpars and set dispaxis = 1.

  5. Type obspars and set up wanted parameters.

  6. Have an assistant install the grating and set the tilt. AVOID ALLOWING EXCESSIVE AMOUNTS OF LIGHT ON THE CHIP BY TURNING OUT THE SPOT LIGHTS AND DOME LIGHTS. Visiting observers are discouraged from changing gratings themselves.

  7. Select/install the proper order blocking filter

  8. Set the slit width to 50 for initial focusing, select the decker, and check that the collimator is in the range 600-700.

  9. On the telescope control computer (TCS), turn on the HeNeA lamp from the comparison window by clicking on HeNeA. This will position the guider optics for the HeNeA comparison source.

  10. Using the TCS mouse, first index the ND attenuator (click on the menu box and select 'index nd wheel'). Then set to an initial value of 100 by holding the middle mouse button and sliding cursor in the intensity box until 100 is displayed.

  11. From the CCD computer take a ten second test exposure with comp.

  12. Inspect the ximtool window and adjust the parameters to suit the data.

  13. Plot the spectrum using implot filename and determine if the correct wavelength is centered. Pay particular attention to the ends of the spectrum. The areas of high vignetting and poor images are below column 400 and above column 2500.

  14. Adjust the neutral density and repeat if necessary.

  15. Do a collimator focus run by starting at high numbers and move down in steps of 20. Past experience found best focus at 2.7-3.0 pixels, see below.

  16. Return to the comparison lamp and check the spectral focus.

  17. Adjust the rotation so that a spectral line runs exactly along columns, or if using the quartz lamp, along rows. See the section below on rotation adjustment.

  18. Set the slit width for observing, the final grating tilt and on-chip binning (or format).



next previous contents
Next: Focusing the Spectrograph and Telescope
Previous: Software Control - ICE and X-Windows

kessel@noao.edu
Wed Aug 2 13:05:25 MST 1995