Operating Procedures: Microscope Control
5-7
C O N F I D E N T I A L
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User Manual
Revision A
Feb 2018
Inserting / Exchanging Specimen
1.
Click on the
Vacuum
module /
Vent
button.
The confirmation dialog appears.
After switching High Voltage off, the vacuum
system switches off the pumps and opens
appropriate valves to vent the system. After a
specified venting time, the venting valves will
close.
Note
If the venting valve closes before the chamber is
at the atmospheric pressure (it is not possible to
open the door), click on the Vent button once more to open it again.
2.
When vented, open the specimen chamber, and using lint-free gloves or tweezers, place a specimen into the
specimen holder.
3.
Close the specimen chamber door and click on the
Vacuum
module /
Pump
button.
Instructions for a sample exchange are also shown within the informational window by clicking on the
toolbar icon.
Selecting Vacuum Mode
When a specimen and appropriate detector(s) are installed correctly,
continue the procedure (see above):
4.
Check the
High Vacuum
module /
Low Vacuum
or
High Vacuum
mode radio button.
For the Low Vacuum mode select the appropriate gas from the
drop down list and the target
Chamber Pressure
to pump the
system to.
W A R N I N G !
The system can be damaged by using the Low Vacuum mode without an
appropriate PLA. Do not select a PLA Cone that is not actually being
used (see Chapter 2)!
X-Ray Cone Mounting / Dismounting Procedure
Under normal operation, the system will know the PLA cone size for
the detector installed in the LoVac mode. This will allow the system
to set automatic pressure range limits for the aperture installed,
thus avoiding vacuum errors when setting the chamber pressure.
The X-Ray cone is stored in the provided installation tool.
The large
arresting screw releases the working part so it can slide along its
skid.
