FEI Quanta FEG 250, User'S Operation Manual

Page: 110 / 228

Alignments: 3 - Stage Rotation Centre
6-8
3 - Stage Rotation Centre
The stage rotation has a mechanical center and it can be controlled by
changing the
Stage module / Coordinates tab / R value. This moves
the stage around its mechanical center. In some circumstances this is
not desired because a rotation around the field of view center would
be more useful.
The following correction is the alignment procedure for the
Compucentric Rotation function. The X / Y offset is calculated so that
the Compucentric Rotation is correct from that point on.
1. The magnification should be from 500× to 2000×, and the sample
should have a recognizable feature close to the center of the stub,
which is mounted in the stage center. Make sure the tilt is zero.
2. The stage automatically rotates the view 180º.