FEI Quanta FEG 250, User'S Operation Manual

Page: 59 / 228

Software Control: xT microscope Control Software
4-31
The Scanning Tab
allows the user to change the dwell-times (scanning speeds) table
and to set-up the Slow scan / Fast scan / Snapshot / Photo function.
FIGURE 4-17 SCANNING PREFERENCES
On the left side of the module there is a dwell-time preset list with the
fixed number of entries. Selected
Preset values can be changed in
the Property Editor on the right side of the module. The following
properties are editable (depending on the kind of the preset):
• Dwell Time: one point beam duration time
• Line Integrate: no. of line scanning repetition
• Resolution: no. of points, Width × Height (imaging resolution)
• Integrate (1, 2, 4, 8, 16, 32, 64, 128, 256): no. of integrated frames
• Acquisition: (8 bits / 16 bits) sets the captured image bit depth
• Drift Correction (Yes / No): corrects imaging drifting when
averaging filter is active. When activated, the text below the
blinking quad pause icon notifies an user.
• Continuous Scan (Yes / No): when starting up a Snapshot / Photo
function, scan in progress is finished before image grabbing starts.
This functionality is convenient for charging samples but it requires
same scanning conditions for scan in progress and Snapshot /
Photo function preset.
• Action activated at the end of Photo / Snapshot function :
Save saves the image using an automatic file name and format,
Save As… opens the Save As dialogue to save the image,
None just pauses imaging.
• Post Processing (None / Image enhancement): enables to start
Image Post Processing after an image acquisition.
Following properties are informative and non-editable:
• Line Time: line scan duration time,
• Frame Time: quad scan duration time,
• Refresh Rate: imaging refresh frequency.