Instruction manual

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 Table 7.2a), allow the operator to either manually or automatically tune the cantilever. For
most purposes, the Auto Tune function will suffice. 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%
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