APPENDIX 1: Align the Instrument:
If you change the
mechanical aperture, the
accelerating voltage or the probe
current
, specific alignments of the instrument must be performed.
Mechanical Alignment:
-At the desired
magnification, first turn the
X-Align knob
(Fig.A1-X)
at the
side of the aperture control
until the beam reaches its
brightest.
-Hit “ABCC” to readjust
brightness.
-Repeat using Y-Align knob
(Fig.A1-Y)
on the end of the column. BE CAREFUL! You
can lose the beam entirely if you go too far. You must now perform the following
alignments:
Begin Beam Alignment:
-Begin with a magnification of
1000x –
5000x
. Once you complete the alignment at that
zoom, repeat this whole process a second time at
twice your desired magnification.
-Apply the KV and probe current settings desired for
operation
-FIRST, perform normal focus and stigmation
operations
without opening the align window.
The system must be relatively focused before
attempting to align it.
-Now open the alignment window.
(Fig.A2)
-The functions of the “X and Y Dials”
(Fig.A3-X,Y)
on
your dial panel will change as you move down this
list of radio buttons to adjust various condensers and apertures.
Figure A1. Mechanical Alignment
-X
-Y
Figure A2. Beam Alignment
X
Y
Figure A3. Alignment Controls
