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Your instrument support person will do all the set-up of the spectrograph on the first afternoon of your run; if you've requested a grating change during your run in advance (when you fill out your Observing Run Preparation form, aka ``the pink sheet") someone will do the physical change for you, and help you do the final tweaking. The items described in this section should be carried out by trained Observing Support personnel to assure safety to our equipment. We simply summarize in this section the steps that are needed so that you will be up to speed when these steps are performed on the first afternoon.
There are basically three adjustments that need to be made when changing gratings: