Nanosurf easyScan 2 AFM, Operating Instructions Manual

Page: 54 / 164

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EASUREMENT
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Now check that the set point and the feedback speed are set properly:
- Click in the Navigator to open the Z-Controller panel.
For Dynamic Force mode:
- Set ‘Set point’ to 50-70%.
For Static Force mode:
- Set ‘Set point’ to 10-20nN.
- Set ‘Loop gain’ to 1000-1500.
Now you can start the approach:
- Click in the Approach panel.
The cantilever is moved towards the sample using the approach stage, with
the Z-Controller turned on. The motion continues until the Z-Controller
error becomes zero. From now on the distance between sample and tip is
controlled automatically by the electronics. A message ‘Approach done’
appears when the approach has been completed.
Starting a measurement
Now that the tip-sample interaction defined by Set point is flowing
between tip and sample you can start measuring:
- Click to open the Imaging window.
The instrument was set to automatically start measuring after the automatic
approach. Two representations of the ongoing measurement are drawn in
the Imaging panel. One representation is a color coded height image, called
a Color map, the other is a plot of height as a function of X* position called
a Line graph. Watch the displays for a while until about a quarter of the
measurement has been measured. With the current setting, the software
automatically adjusts the contrast of the Color map, and height range of the
Line graph to the data that have been measured.