4 PREPARATION FOR OBSERVATION
When the Si
3
N
4
cantilever is used in this state, the SUM value is about
−
8.00 V to
−
10.0 V. When the Si cantilever for the AC mode is used, the SUM value is about
−
5.00 V. If the SUM value is small, it is conceivable that the laser beam position on
the cantilever may have shifted from the correct position. Readjust the laser beam
position according to Section 4.2.1, "Adjusting the Laser Beam Position."
Photodiode adjustment procedure
Photodiode
1.
To roughly adjust the photodiode position, watch the laser beam spot on the
photodiode from the right side of the AFM head unit.
2.
Adjust the photodiode position using the X- and Y-axis positioning knobs so
that the center ( ) of the photodiode is positioned at the center of the laser
beam.
Look in the AFM head more than 20 cm away from the AFM
head since a Class 2 laser is provided in the AFM head.
WARNING
TMPM5200-2
4-15
