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3.5.3
3 - 43
(3) Slow Scanning:
Slow1 and Slow2 are relatively fast slow scans.
These two speeds are asynchronous to AC line frequency. It may cause some field
magnetic disturbance at high magnification and/or low kV condition.
Use for a field search of the specimen, coarse focus, etc.
Slow 1: About 1 s/frame (Full screen) About 0.5 s/frame (Small screen)
Slow 2: About 4 s/frame (Full screen) About 2 s/frame (Small screen)
(4) Slow Scanning:
Use these for observation, fine focus, and astigmatism correction. Finest image quality
may be attainable.
Slow 3: 19 s/frame (Full screen) 10 s/frame (Small screen)
Slow 4: 38 s/frame (Full screen) 19 s/frame (Small screen)
Slow 5: 77 s/frame (Full screen) 38 s/frame (Small screen)
(5) Reduce Area Scanning:
Three reduced area scanning speeds are available.
(a) Reduce 1:
The scan speed is approximately equal to the TV scanning rate. It is, therefore,
suitable for searching the field, focus and astigmatism correction.
To move the scanning area box, place the mouse cursor over the border of the reduced
area window. While the mouse cursor is changed to the Move indicator (intersecting
arrows), press the left button and drag the scanning area box to a desired place.
(b) Reduce 2:
Scanning speed is the same as Slow3 while the frame speed is 4 times faster.
It is suitable for final focus and astigmatism correction. The scanning area can be
moved with the same operation as mentioned above.
(c) Reduce 3:
Image size is the same as Reduce1 and a slower horizontal scanning speed is utilized.
It is useful for optional detector signals having low frequency bandwidth such as BSE
detector or ESED.