JEOL JSPM-5200 Instructions Manual page 93

５ MEASUREMENT OPERATION
■ Adjusti
ng a cantilever re
1.
Select either AC or FMD from the AFM Mode selection box in the AC Mode
window.
2.
C lick on the Adjust PD button to open the Display Window. A caret symbol (^)
appears and a message window opens,
adjustment is complete.
3.
A djust the photodiode position adjustment knobs so that the red spot enters
the blue zone at the center (
4.
Click
Autotune dialog box.
a.
AC mode
Select the approach conditions (Reference value) to be used after impl
a djustment of the cantilever resonance point. When the Light Approach radio button
from the AC
may be set, causing the distance between the probe and
than is the case in selecting the Normal Approach radio button. But
Approach radio button is selected, the distance becomes longer. The selection
should be made in accordance with the softness of the specimen, absorption, or any
surface condition of the specimen.
b.
FMD mode
When FMD mode is selected, the FMD Autotune dialog box appears. Select the
amplitude (RMS value) and the width of FM detection (dynamic range) to be used
after adjusting the cantilever resonance point. Doing this determines the resolution
and the width of the detectable dynamic range. T
specimen, like an image of atoms, you may also select Range1 or Range2. When the
scan size is large and the surface of the specimen is rough, choose Range3 or
Range4.
5-30
sonance point
Either of the detection modes, AC (amplitude detection) or FMD (frequency
detection) can be used
suited for high-resolution o
higher sensitivity under vacuum, as compared with AC, in detecting
topographical change in the specimen.
on the Tune button in the AC Mode window to open the AC/FMD
Autotune dialog box is selected, a comparatively large reference value
under atmospheric pressure. However, FMD is better
bservation under vacuum. In general, FMD provides
asking whether or not PD
Sect. 5.4.1d). Then click on the OK button.
the specimen to be longer
when the Heavy
o resolve a finer topographical
ementing
TMPM5200-2