FEI Quanta FEG 250, User'S Operation Manual

Page: 132 / 228

Stages: Stage Related Functions
7-18
SCAN ROTATION (SHIFT + F12)
This function activates the onscreen tool to rotate the scan and align
the image. Because it is solely a scan coil function, it has no effect on
the stage movements. It is used to orient the image relative to
mechanical rotation and detector direction.
Clicking the Scan menu / Scan Rotation places a green circle in the
image window. The green triangle on its perimeter denotes, by its
position, the sample rotation relative to its original position when
mounted on the stage. Initially, this is in the 12 o’clock position. Drag it
around the circle to choose a new sample rotation.
The readouts displayed at the image window bottom provide
information about the
Actual Rotation (original position) and the
Target Rotation (the selected position).
Clicking the written angles around the circle perimeter (0° / 90° / 180°
/ 270°) or the perimeter anywhere drives the stage to that rotation
position and the green triangle updates onscreen. Clicking the framed
+ / – sign increases / decreases the rotation angle by an incremental
value.
FIGURE 7-13 SCAN ROTATION
Once selected, the compucentric rotation control disappears
automatically after 10 seconds of no use (see the
Preferences… /
General tab).
The smaller circle in the top right of an optical quad remains onscreen
when the Scan Rotation angle is different from 0°.