Contact AFM Mode
Preparation Prior to Imaging
88
MultiMode SPM Instruction Manual
Rev. B
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6.1
Preparation Prior to Imaging
6.1.1 Adjust the Detector Offsets
Verify that the MultiMode head has been
fi
tted with a Contact Mode probe tip per instructions
provided in
of this manual. The laser beam should already be positioned on the back of
the cantilever. This will provide a starting point for adjusting the laser sum value.
To adjust the detector setting,
fi
rst review the operation of the various adjustment screws (see
). The detector adjustment screws are at the left side of the head.
Figure 6.1a
Photodetector Mirror Adjustments—Rear View
Refer to
. For laser aligning screws atop the SPM head, the right-front screw moves the
laser spot left-to-right (horizontally or along the X-axis). Turning this screw clockwise moves the
laser spot to the right. The left-rear laser aligning screw moves the laser spot top-to-bottom
(vertically along the Y-axis). Turning this screw clockwise moves the laser spot rearward.
Note:
Use of the laser aligning screws to adjust the laser sum signal is NOT advised;
users should adjust the laser sum signal from the photodetector adjustments
only.
For initial adjustment, center the spot on the cantilever as described in
Photodetector Vertical Adjustment Knob
(A - B)
Photodetector Horizontal Adjustment Knob
(C-D)
Tilt Mirror Lever
