Thermo Scientific Apreo User's Operation Manual page 58

5. Beam module
Stigmator 2D control
enables correcting of image astigmatism. The crosshair indicator
indicates the actual setting.
Shift + Right-clicking on an imaging display triggers astigmatism
correction. Unlike the 2D box control, this is magnification-sensitive and is therefore suited for fine corrections at
high magnifications, or for employing the Adaptive Sensitivity functionality.
Beam Shift 2D control
indicates and controls the beam shift with respect to the objective lens axis. It is useful for fine imaging shifts
without stage movement.
Shift + Clicking on an imaging display triggers the Beam Shift function. The standard mouse cursor changes to the
"hand" cursor, and the imaging can be dragged on the screen. Because of a limited Beam Shift range, this works
well only for high magnifications or when employing the Adaptive Sensitivity functionality.
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Note
Right-clicking on the 2D box opens a context menu with the following choices (for more, see
Software Interface Elements / 2D Controls):
• The Reset sets the Beam Shift value to zero and moves the stage to compensate for
the resulting imaging shift (same as the Stage menu / Beam Shift Reset function).
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6. Beam Deceleration module
In the Beam Deceleration mode (option), a negative potential
Stage Bias, is applied to the stage, which influences both primary
and detected electrons. This functionality is standard for biases
ranging from -50 V to +50 V. There is an option for biases ranging
from -4 000 V to +50 V.
7. Scan rotation module
controls and shows the Scan Rotation value.
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8. Detectors module
contains adjusters to control the actual detector Contrast
(electronic gain) and Brightness (voltage offset). The values are
remembered for each detector. The adjusters are disabled if the
detector is not available or cannot be controlled (e.g. CCD camera
or an External detector).
Contrast / Brightness / Enhance adjusters
Regardless of the detector's actual gain range, the Contrast & Brightness range is always 0 - 100 (%) and the small
/ large step size is 0.1 / 1 (the Brightness step size may differ for some detectors in order to achieve sufficient
sensitivity). A direct value can be entered by double-clicking on the Contrast / Brightness value.
Ctrl + clicking on while left-right / up-down dragging within an imaging display controls the Contrast / brightness.
The Low Vacuum detectors could have specific controls within
the Detectors module.
3-32 User Manual
Software control: Microscope Control
C O N F I D E N T I A L – limited rights
Feb 2018 Revision A