Head, Probe, & Sample Preparation
Advanced AFM Operation
118
Dimension 3100 Manual
Rev. D
Figure 7.3a
Default SPM Stage Parameters
Definitions of
Stage
>
SPM Parameters
fields are as follows:
Sample Clearance
Defines the height of the probe tip over the sample prior to
Engage
(set up by performing the
Locate
Tip
and
Focus Surface
routines). You may change the sample clearance parameter once
you are experienced with the system. The default parameter is 1000µm. This parameter also sets
the distance that the tip is raised above the sample each time
Withdraw
is executed.
SPM Safety
Defines the height of the probe tip over the sample where the fast approach changes over to the
slow approach. The default parameter is 100µm. You may reduce to 50-75µm once you are
experienced with the system. Reducing this number speeds up the approach sequence, but it
increases the risk of the tip reaching the surface during the fast engage if the
Locate Tip
and
Focus
Surface
focal points are not properly set. If this happens, the tip has “crashed” and may need
replacing.
SPM Engage Step
Defines the step size of the Z-stage during engage. The default parameter is 1µm. Increasing this
increases the speed of the approach.
Load/Unload Height
This parameter defines how high the tip moves above the sample when
Stage
>
Load New Sample
is executed. After the Z-stage is raised, the sample stage moves as far forward in the Y direction
(towards you) as possible.
CAUTION:
Do not change this parameter by more than 0.5-1 µm because the
step size must be some modest fraction of the total Z range of the
scanner (i.e. 6-7µm).
SPM Parameters
Sample clearance:
SPM safety:
SPM engage step:
Load/Unload height:
1000.0
µ
m
100
µ
m
1.00
µ
m
3000
µ
m
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