TappingMode AFM
Preparation Prior to Imaging
110
MultiMode SPM Instruction Manual
Rev. B
Figure 7.2e
Cantilever Tune Panels
The
Frequency Sweep
(a plot of cantilever response as a function of applied vibrational frequency)
is shown on the display monitor. The two main panels,
Sweep Controls
and
Auto Tune Controls
(see
), allow the operator to either manually or automatically tune the cantilever. For
most purposes, the
Auto Tune
function will suf
fi
ce. To tune the cantilever automatically, simply
click on the
Auto Tune
button; the computer and controller will do the rest, setting such parameters
as
Setpoint
and
Drive amplitude
automatically.
Table 7.2a
Auto Tune Default Values
At times, it may be useful to tune the cantilever manually, for example, to purposefully offset the
drive frequency above or below the resonant frequency as is often done during MFM and EFM
imaging.
Note:
More than one type of cantilever exists. Different types have different
dimensions and therefore different resonance frequencies. Check the box used
to ship the cantilever to see what its resonant frequency is, or refer to
Appendix
A
in the
Command Reference Manual
.
Parameter
Setting
Start Freq.
100kHz
End Freq.
500kHz
Target Amp.
1-2V
Peak Offset
0-10%
031
