Zeiss ?IGMA VP-FE-SEM User Manual - page 15
SEM Quick Start
Revision No.2
May 2014
Page 11 of 16
Keyboard
. Once enabled, a small box will appear somewhere in the
viewing window. Any changes made to the scene will only take place
within the perimeter of this box. The location and size of the reduced
raster window can be changed by clicking and dragging around the edges
of the box as desired.
1.3.6
Brightness and Contrast
The brightness and contrast of the image displayed in the main
viewing window can independently be set either automatically or (after
some practice) manually using the
Zeiss SEM
keyboard. Beginners are
advised to ensure that the brightness and contrast levels are set
automatically by the software. To enable this feature, click the
Detectors
tab under the
SEM Control
group on the right side-panel. Find the first
dropdown menu in the
Signal Adjust
box and select
Auto BC = On
.
Different modes can be enabled per the operator’s preference using this
dropdown menu.
1.3.7
Magnification and Focus
The two primary factors that affect the characteristics of the final
image are the magnification and focus of the microscope. The current
magnification level is shown at the bottom of the main viewing window in
the textbox that reads
Mag =
Y X
. Changing the magnification of the
image is done using the dial labelled
Magnification
on the left-hand side
of the
Zeiss SEM
keyboard. It is sometimes convenient to zoom all the
way out while switching between samples (Sections 1.3.2 and 1.3.3).
The focus of the image is changed similarly by rotating the dial on
the right-hand side of the keyboard labelled
Focus
. It is often
advantageous to repetitively magnify and focus the microscope until the
quality of the produced image begins to depreciate. Once at this point the
operator should check to ensure that the electron beam is properly
stigmated and that the apertures are aligned.