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Section III-E: Detector Mounting Instructions: Mounting Focal Plane Detectors to
the SP-2300i Spectrograph
The standard mounting flange for CCDs and diode arrays accommodates detectors with two different bolt
circles. There are three (3) equally spaced #10-32 tapped holes on a 3.60” bolt circle, and three (3) equally
spaced holes on a 3.88” bolt circle designed to accept #10-32 button head screws. A baffle is mounted in the
array detector mounting flange to define the focal plane area. This baffle has two sets of mounting holes
90 degrees apart which permit the mounting to be rotated 90 degrees to accept different array detectors.
To mount an array detector to the SP-2300i, use the following procedure:
1. The array detector mounting flange has a sliding tube, which fits inside the front plate of the SP-2300i.
Note: At this point it is very important to check the focal plane distance of the array
detector. This is the distance from the front mounting surface of the array detector to
the actual CCD or diode array element. Because array detector focal distances vary,
the correct distance is crucial in order to determine if a spacer is required for proper
focus. This spacer is provided with spectrographs. If the detector focal plane distance
falls between .67” and 1.00”, then no spacer is required.
2. Using a 1/8” Allen wrench, loosen the two (2) set screws located at the top and side of the front plate.
Gently slide the array detector mounting flange all the way out of the SP-2300i housing. Make sure
that the sliding tube and O-ring are kept clean.
3. Remove the shipping cover from the sliding tube, and the spacer if not required.
4. Position the array detector mounting flange against the array detector, and match the hole patterns.
When correctly positioned, the baffle aperture orientation should match the detector array orientation.
If it does not align properly, contact Princeton Instruments.
Note: Refer to the Detector System Manual for specific instructions on how to mount the
array detector to the mounting flange. These instructions vary with the detector nose
design.
5. Fasten the array detector mounting flange to the detector, and then carefully slide this assembly back
into the SP-2300i housing.
6. Tighten the #10-32 set screw on the top of the front plate first, and then tighten the one on the side.