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Section IV-E: Converting the SP-500i from Monochromator to
Spectrograph, or Spectrograph to Monochromator
Monochromator to Spectrograph: This procedure requires that you have the monochromator
version, Model SP-555, plus the array detector mounting flange.
1. Loosen the two (2) set screws.
2. Remove the four (4) 8-32 socket head cap screws (SHCS) which secure the exit slit to the
SP-500i housing. Details of the slit assemblies can be found in the drawing located
in the Appendices Section.
3. Gently slide the slit assembly out of the SP-500i housing and store in a clean, dry
area. The exit slit assemblies are attached to a sliding tube which is removed along with the
slit body.
4. Slide the array detector mounting flange into the SP-500i housing so that it rests
against the housing. It may be necessary to turn the focus-stop thumb wheel counter
clockwise so that it does not interfere with the array detector mounting flange.
5. The SP-500i has now been converted from monochromator to spectrograph.
6. Refer to Sections III-E “Mounting Focal Plane Detectors...”, and IV-D “Focus and Aligning
Array Detectors” for actual mounting, alignment, and focus of array detectors.
Spectrograph to Monochromator : This procedure requires that you have the spectrograph
version, Model SP-556, plus the Model SP-716-2 exit slit assembly.
1. Loosen the two (2) set screws and gently slide the array detector mounting flange out
of the SP-500i housing.
2. Remove the array detector if attached, then store the array detector mounting flange in
a clean, dry place.
3. Locate the Model SP-716-2 exit slit assembly, then gently slide it into the SP-500i
housing until it rests against the housing. Exit slit assemblies are attached to a sliding
tube to fit the SP-500i housing.
4. Using four (4) 8-32 socket head cap screws (SHCS), secure the slit assembly against
the SP-500i housing. There are four (4) tapped holes in the SP-500i housing to
facilitate mounting the exit slit.
Note: The slit aperture is slightly offset in the slit assembly. It should be oriented so that the
aperture is on the upper side when properly mounted to the SP-500i. On the
bilateral slits, the micrometer points upward. On the fixed slit assemblies you should be
able to read the slit width marking (it will be upright). Please refer to the drawing in the
appendices section of this manual for correct orientation if necessary.
5. The SP-500i has now been converted from spectrograph to monochromator .
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