Thermo Scientific Apreo User's Operation Manual page 129

Compucentric Rotation (F12)
Clicking on the Stage menu / Compucentric 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.
The readouts shown at the image window bottom provide
information about the Actual Rotation (original position) and the
Target Rotation (the selected position).
Click on & drag the triangle around the circle to choose a new
sample rotation. Releasing the mouse updates the stage position
to bring the original field of view (rotated to the Target Rotation
position) onscreen. With a sample at the eucentric position this
can be performed at any sample point irrespective of the
mechanical stage center.
Clicking on 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 on the framed + / – sign increases / decreases the rotation
angle by an incremental value.
User Units
Clicking on the Stage menu / User Units item (a tick mark appears
next to it) activates user defined units as the basis of the stage
coordination system. The UU appears in the Stage module next to
the X and Y values and the stage coordinate system activates the
last defined user units.
Define User Units Procedure
This procedure assigns user-defined points to stage points. The
stage coordination system can be anchored to either 1, 2 or 3 points, depending on the sample management or
application. For example, if you choose a (0,0) position, you can drive the stage relative to that origin using user
defined units (0,1 / 1,0 points), which may equal to some repeated sample structures, etc.
It is possible to end the procedure by clicking the Finish button when point(s) (0,0) / (1,0) / (0,1) are defined. An
overview of the point(s) just defined is shown. The Details button shows the actual coordinates with the possibility
of browsing them (Go to button) and editing their values.
1. Find a sample surface feature and view it at an appropriate magnification to check its relation to other structures.
2. Click on the Stage menu / Define User Units item. The
dialog appears to alow choosing the desired operation:
• Define new User Units – defining of new User Units
• Redefine User Units – changing or updating User Units
• Redefine User Units with shift – as above, with the use of
the Beam Shift
• Reset User Units so that they are equal to the Stage Units
3. Click on the sample user point (0,0) and its coordinates
appear in the Details module. Proceed by clicking the
Next button.
C O N F I D E N T I A L – limited rights
Revision A Feb 2018
Operating Procedures: Stage Control
User Manual 5-31