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The differences in modes give you the possibility to define measurement designs, dependent on
the parameter which can be held constant during one measurement. For this, a basic understanding
of the working principle of the operational modes is crucial.
D-mode
In D-mode, a piezo displacement profile is defined by the user, resulting in a specific load and
corresponding indentation depth. The indentation depth depends on the displacement profile and
the ratio of cantilever and sample stiffness. Since the piezo is not receiving any feedback signal from
the sample (cantilever bending), it is working in an open loop with the sample.
To define such displacement profile of the probe for an experiment in D-mode, you need to switch
first to ‘Displacement control’ in the ‘Mode Selection’ part of the main software window (Figure 20).
By clicking the ‘Profile’ menu bu tton you enter the ‘Configure Profile’ window, where a graph
represents the displacement profile, of which the displacement (µm) and time (s) variables can be
customized. A maximum segment number of 12 can be defined, by default the segment number is
set to 5 (Figure 21).
Figure 20: Mode selection