Cypher SPM
User Guide
16.
17.
Prepare to land the tip:
l
Click the Move to Pre-Engage button. Motors automatically bring the tip to 50μm from the sur-
face.
WARNING:
If you set a bad sample height and/or tip position you may ram your cantilever into the sample
and break it. A firmware safety feature immediately cuts motor power when the optical detector
fails to measure reflected light from the broken lever. This prevents the cantilever holder from
ramming the sample.
18.
Fine tune spot position:
l
At this point you should adjust the spot position so that it is near the end of the cantilever using
the controls in the upper left hand corner of the video panel. Note that a decrease in Sum Signal
indicates that light is spilling off the cantilever. The latter is undesirable and should be avoided.
HINT
For fine positioning hold down the SHIFT key on your keyboard while clicking the onscreen but-
tons which move the cantilever under the laser spot (See
).
19.
Center the laser on the photo detector:
l
Hit the red button at the center of the video window motion controls and watch the Deflection
Signal go to zero. This action causes small motors to steer the laser beam to the optimum pos-
ition on Cypher's photo detector.
Page 164 of 243
24 Engaging the cantilever on the sample
