Veeco Dimension 3100, Manual, Page: 168 / 376

TappingMode AFM
Troubleshooting
148 Dimension 3100 Manual Rev. D
9.5 Troubleshooting
9.5.1 Frequency Response Plot
If a peak in the frequency response plot does not appear, perform the following steps:
1. Increase Sweep width to the maximum value.
2. Increase the Drive amplitude in intervals of 200-300mV until you have reached 2-3V.
3. If the peak still has not appeared, then increase the Sweep width by first increasing the
Center Frequency , then maximizing the Sweep width . If there is still no peak on the
response plot, check the laser alignment.
9.5.2 Engaging the Sample
If the engage aborts because the tip is still too far away from the surface, return to Stage/Focus
Surface and use the trackball to relocate the surface. After successful re-engaging, a well formed
image appears on the display monitor.
9.5.3 Cantilever Will Not Tune
If the Cantilever Tune fails, check the following:
• Ensure the laser is properly aligned at the free end of the cantilever (the end furthest
from the substrate).
• Ensure there is good physical coupling between the probe and the probe holder. Make
sure the groove the probe is held in is free of debris, and that the probe substrate is in
firm contact with the back wall of the groove and is pushed firmly against one side of
the groove.