Changes

- unplug Unplug the USB cable from the rear-of-slit camera - undo Undo the bolts to remove the shield that protects the rear-of-slit camera - remove Remove the 4 M5 bolts that secure the south cover to the interface plate - undo Undo the toggle clamps that hold the covers together - partially Partially retract the south cover of the instrument (it need not be fully removed, just opened enough to be able to access the brake) - before Before changing the grating angle, slack off the 4 black M3 bolts on the grating brake (inside the instrument) to release the brake - in In the software, go to the ''Config'' tab, click the ''Unlock'' button, and enter the password - still Still on the ''Config'' tab, click the ''Deactivate Grating Brake'' button (this will change to say ''Apply Grating Brake'') - after After the grating brake has been released in software, the initialise grating angle and the grating angle ''Go'' buttons will be enabled - initialise Initialise the grating on the ''Advanced'' tab - in In the ''Main View'' tab, enter the required grating angle and click the ''Go'' button - the The observer will need to take arcs and compare them to arc maps in the old spectrograph manual, or in the table above - they They will adjust the angle until they are happy with the set of arc lines landing on the CCD - once the desired angle has been set, click ''Apply Grating Brake'' in the ''Config'' tab - lock the grating on the ''Config'' tab - enable Enable the physical brake on the grating (inside the instrument) by tightening the 4 black bolts - tighten Tighten the bolts ''carefully'' to avoid disrupting the grating (one could slightly change the angle and the process will need to be repeated) - close Take an arc to make sure that the lines did not move significantly - Once the desired angle has been set and the arc still looks good, click ''Apply Grating Brake'' in the ''Config'' tab - Then apply the software lock (to disable grating angle changes) on the ''Config'' tab - Close up the south cover of the instrument and fasten the toggle clamps - replace Replace the 4 M5 bolts through the interface plate to secure the cover - reRe-attach the shield for the rear-of-slit camera - plug Plug in the USB cable for the rear-of-slit camera - restart Restart the lodestar camera interface to check that the camera is operational