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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 µm

100 µm

1.00 µm

3000 µm

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Dell 3100 Spezifikationen Seite 138