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Chapter 3 SCT 320 Operation 37
3. Set the slit to 10 µm at a minimum. If necessary, adjust the Exposure Time to maintain
optimum (near full-scale) signal intensity.
4. Wait until the detector locks at its default temperature. If the detector is LN-cooled, it
should have been filled after the detector was powered ON.
5. Turn on Focus mode.
6. Adjust the rotation alignment. First, use a 9/64” hex wrench to loosen the four screws at
the corners of the detector mounting plate. While watching a live display of the spectrum
displayed as a graph, select a peak to monitor and then rotate the detector (up to 4 degrees
of rotation are possible). The peak will go from broad to narrow and back to broad. Leave
the detector rotation set for the narrowest achievable peak.
Alternatively, take an image, display the horizontal and vertical cursor bars, and compare
the vertical bar to the line shape on the screen. Rotate the detector until the line shape on
the screen is parallel with the vertical bar.
Another technique is to set up three ROIs (one at the top, middle, and bottom of the
array) with 10 rows binned for each via the Experiment Setup|ROIs tab, Then change
the data display via the Display Layout dialog, so that 3d Graph is selected (General
tab), the Z Axis Endpoints (3D Layout tab) are %X = 0 and % Y = 40, and the Save as
Default check box is checked. Click on OK. While running in Focus mode, you should
see three stacked graphs. Aligning the large cursor with a prominent peak, rotate the
detector until the peak aligns with the cursor in all three ROIs.
7. After completing the rotational alignment, tighten the four mounting plate screws.
8. Remove the cover from the Micrometer Compartment.
9. Using a 3/32” hex wrench, loosen the locking set screw.
10. While continuously acquiring data, adjust the micrometer until you maximize the
intensity level and minimize the FWHM of a selected peak or peaks.
11. Tighten down the locking set screw.
12. Place the Micrometer Cover on the spectrograph. Replace and tighten all of the cover
screws.
13. Then stop acquisition.