Stereo Scan 440 - DCU

2-6 Chapter 2. Operation '.
AItematively:-
From the menu Stage/Vac, select Specimen change
2.
A conb"Ol panel will be displayed from which the beam can be switched on
and off and the chamber vented or pumped.
When Beam On is selected, the beam conditions used when Beam Off was
selected are restored.
Before loading a specimen into the specimen chamber, the chamber must first be
brought to abnoSpheric pressure by selecting Vent in the vacuum Stanis dropdown
box in the toolbar. Safety interlocking of high voltage supplies results in
the Vent command being disabled unless the beam is fIrst switched off. To open
the chamber and change the specimen:-
Ensure that the beam is off (indicated in the toolbar). If it is not, switch it off
using the previous routine.
2. Vent the chamber using the dropodown box in the toolbar.
3, Release the chamber door catch
4. When the chamber is at atmospheric pressure, the door can be pulled open.
s. Remove the previous specimen, if there is one, by loosening the small
locating screw holding the specimen stub in position.
Anyone of a variety of specimen holders may be in use - however, they are
all held in position with a small locating screw. To loosen the screw, use the
smaller of the two ball-ended drivers provided.
I
6. Insert the new specimen and tighten the locating screw
Close the chamber door and fasten the door catch.
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8. Select Pump from the drop down box in the toolbar. The pumps should now
start.
9. Within 5 minutes. depending on the specimen and the length of time the
chamber was left open, the vacuum status should reach Ready. This is
indicated both in the toolbar and in the vacuum status panel, obtained using
keyboard key V. If vacuum is not achieved within this time. see Section 2.2.6
Getting a Vacuum.
StereO$can 440 Operator Manual
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