E. Place a reflecting sample, such as a silicon wafer, on the sample stage, under the lens
assembly. You should now see a trace on the screen. Turn the tilt adjustment screws to max-
imize the signal. If the signal saturates, reduce the integration time (see step b).
F. Optimize the focus to maximize the measured signal by adjusting the fiber-optic cable posi-
tion in the lens assembly. Focus the light beam on the sample by sliding the fiber-optic cable
inside the lens tube. To see the beam, it may be necessary to place a diffuse surface, such as a
business card, over the sample. Ideally, the best focus adjustment is when the beam is just
under focused. To achieve this, focus the beam on the reflecting sample, and then move the
fiber-optic cable slightly down in the lens tube until maximum signal is obtained. When fin-
ished, tighten the socket head set screw that secures the fiber. Once again, if saturation occurs,
it may be necessary to reduce the integration time.
G. Repeat steps e) and f) to make certain the adjustments are optimal.
H. The set up is now complete. Close the Set Up>Raw Signal… dialog box.
SS-3 in Small Spot Position
If the SS-3 stage is not already in Small Spot position, it can be repositioned by removing the hex-
socket bolt accessed on the backside of the stage arm. Next connect the fiber-optic cable between
the F20 and the stage as shown below. If the fiber does not have a white label indicating “Light
Source”, then the two fiber ends are identical and can each be attached to either the light source or
spectrometer. Focusing will be required before making measurements, please see Focusing your
fiber-optic.
SS-3 in Standard Position
Connect the fiber-optic cable to the F20 as shown below. Fully insert the fiber-optic cable into the
lens tube. Focusing may be required depending on the height of your sample, please see Focusing
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