Veeco Dimension 3100, Manual

Page: 161 / 376

TappingMode AFM
Basic TappingMode AFM Operation
Rev. D Dimension 3100 Manual 141
Feedback Controls Panel
• Set the Integral gain to 0.5 and the Proportional gain to 0.7 (see Figure 9.2h ).
• Set the Look Ahead gain to zero.
Figure 9.2h Suggested Feedback Controls Settings
Note: The Drive frequency and Drive amplitude values were determined during the
Cantilever Tune procedure. It is not necessary to enter a value for the
Amplitude setpoint ; this will be determined automatically during the engage
process.
9.2.10 Engage
1. Select Motor > Engage . A pre-engage check begins, followed by Z-stage motor motion.
2. To move to another area of the sample, execute a Withdraw command to avoid damaging
the tip and scanner.
3. Move the stage using the trackball to the next area of interest on the sample.
4. Select Motor > Engage .
Note: After the tip engages, adjust the control panel values to provide the desired scan
parameters. Refer to
Section 9.4.4 for scan parameter optimization.
5. After engaging, it may be necessary to recheck the Cantilever Tune parameters. Select View
> Sweep > Cantilever Tune . In the Tip Offset box, enter 200nm and click OK . Adjust the
Drive frequency if necessary.