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TappingMode AFM
Basic TappingMode AFM Operation
Rev. D Dimension 3100 Manual 137
Note: The Offset command sets the center frequency equal to the cursor position to
shift the plot. The Zoom In command decreases the sweep width and shifts the
center frequency value to stretch the plot.
8. Increase the Setpoint until the peak appears.
9. Continue to Zoom In and center the peak until the peak coincides with the vertical center
line within 10 Hz. The value displayed for center frequency is now used as the resonant
frequency of the cantilever.
Note: The system works well in TappingMode if the center frequency is at, or below,
the peak in the resonance plot. The center frequency can decrease to the point
where the oscillation amplitude reaches 90 percent of the maximum value.
Operate at a frequency lower than the resonant frequency to avoid shifting the
resonant frequency upon approach of the tip to the surface (see Figure 9.2c).
Figure 9.2b Cantilever Tune Control Panels for Main Controls
10. Specify the RMS amplitude after tuning the cantilever to its resonant frequency. The desired
operating amplitude depends on the sample and other scanning conditions.
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