Stereo Scan 440 - DCU

2-22 Chapter 1. Operation
If the word 1..0W' is entered in the mag tab. the magnification will be set to the
lowest value achievable when that entry is selected.
Low Mag
If the word "LOW" is placed in a mag table entry, selection of that entry will
cause the magnification to be set to the lowest achievable value. Subsequent
changes to other electron optic parameters may cause this low value to change,
Adjusting Beam Shift
Beam shift appears as an option on the Stigmation panel. Selecting it allows the
beam shift to be conb"olled from the navigation box on the panel. The beam shift
function allows a small amount of move~nt across the speci~n and can be
used at high magnifications where it is impossible to position the specimen with
the stage.
The beam shifts are also used in the Centre Point Function on the Image menu.
Centre point can be used to bring any point of interest to the centre of the screen
(if it is within the range of the beam shifts). Select image->Centre Point and
the click on the image feature required.
The beam shifts can be zeroed by selecting the Home key on the keyboard.
Blanking the Beam
The beam can be blanked by selecting the Beam Blanked check box on the Gun
Align panel.
Blanking the beam while scanning is not required will reduce electron beam
damage to sensitive specimens.
2.4. Imaging and Image Processing
Adjusting Signal Level
Signal level can be adjusted manually or automatically. Automatic signal
adjustment is controlled from the Signal Adjust panel (right mouse button on the
Signal Level icon).
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Stereoscan 440 Operator Manual