Tip Approach; Z Parameters; Xyz Calibration - AFM Workshop LS-AFM User Manual

3.2.3.1 Tip Approach

This sub-window controls the step used for the stepper motor in tip approach. These func-
tions are very useful for high resolution imaging (see section 6). The Tip Approach motor jog
value automatically adjusts to changes in the Z HV Gain (reduces by a factor of 1/3). When
the advanced tip approach options are not selected on the Pre-Scan tab, the Tip Approach
motor jog function moves to the Other Controls sub-window.

3.2.3.2 Z Parameters

The high-voltage amplifier that drives the Z ceramic in the
XYZ scanner has 15 gain settings. This function allows reduc-
tion of the Z gain of the high-voltage amplifier. Reducing the
gain reduces the dynamic range of the ceramic, which also
reduces the noise floor of the instrument.
NOTE: A new high voltage gain value is entered into the system when tip
approach is being undertaken. Without enabling tip approach, the Z setting
will not change.

3.2.3.3 XYZ Calibration

The calibration values in this sub-window can be adjusted when scanning a standard refer-
ence sample. Appendix C explains how to calibrate the TT-2 AFM in detail.
NOTE: Changing the calibration values
will change the scale on images mea-
sured with the TT-2 AFM. Only change
the values when calibrating with a refer-
ence sample.
NOTE: The Save button will turn green
when pushed. However, the new values
will not be saved in the Scanner configu-
ration file until the Exit button is pushed
in the Topo Scan window. The user must
have administrator rights in order to save
the calibration values.
V 1.1 / LS-AFM Users Guide
Vibrating mode values
Non-Vibrating mode values
Section 3-11