This document describes the procedures for locating and preparing slitmasks for installation in LRIS.

Locating Slitmasks

1.      Check the shelf above the desk in the instrument lab.

2.      Check the 'to be installed' file in the top large desk drawer in the instrument lab.

3.      Check the file of the night's observer in the top large drawer in the instrument lab.

4.      If the mask is not mounted, put it in a frame as per instructions and put the mounted mask in the slitmask case in the numerical position it is to be installed in.

Installing Slitmasks

1.      Clean the mask with compressed air.

2.      Verify that the slits are clean by holding the mask up to the light and examining the edges of the slits with the lamp magnifying glass.

3.      Insert the mask in the holder and screw it in using the screws and allen head or ball driver (1/16") located in the box on the desktop.

4.      Tape the top and bottom edges of the slitmask to the frame.

5.      Install a pickoff mirror if it has a 'pm' label and the filename in the instrument web schedule ends in a '/pm', using the pickoff mirrors, screws and ball driver in the box on the desktop.

6.      Ensure any pickoff mirrors are covering the registration hole, flush with the crossbar and not broken or smudged.

7.      Ensure both frame screws are secure and flush.

8.      Put the mounted mask in the slitmask case in the numerical position it is to be installed in.