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Force Imaging
Force Modulation
Rev. D Dimension 3100 Manual 237
Figure 13.6c Auto Tune Controls Panel
d. Set the Drive frequency to 15kHz and the Sweep width to 30kHz.
e. Set the Drive amplitude at 1V to start. You can readjust this value later.
Note: A series of peaks display on the Frequency Sweep plot. A typical Frequency
Sweep plot is shown in Figure 13.6d.
Figure 13.6d Typical Frequency Sweep Plot
Note: The large drive amplitude is necessary because peaks are smaller than normally
seen during TappingMode operation. This is due to the cantilever not at
resonance; therefore, its motion is mostly vertical. Vertical motion is not
amplified by the beam deflection detection technique which is sensitive
primarily to changes in cantilever angle.
019
Peaks due to bimorph Peaks due to cantilever
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