Stereo Scan 440 - DCU

3. The most frequent cause of leaks is dust or fibres on !O' rings. '0' rings may
be cleaned with a fluff free tissue. '0' ring grease should never be used.
Grease traps fibres and may cause leaks.
4. Do not use any metal tools to remove '0' rings from their grooves. A small
scratch in the bottom of a groove causes a big leak.
s. If the pump down is slow, check the air admittance drier and renew the
desiccant before looking for a leak.
If none of the above point to the cause of the leak. refer to Section 5.4 Looking
for Vacuum Leaks.
2.2.7. Initialising the Stage
If a motorised stage is fitted it must be initialised before it can be used with the
absolute stage movement function (or with any of the stage options). Stage
initialisation is the process by which the system finds out the actual position of
the stage relative to its limits. There are two ways of performing stage
initialisation: -
Manual
The stage initialisation panel is selected from the Stage/Vac menu. It contains
fields for X, Y and Z stage positions.
The field on the stage initialisation panel which reports the initialisation
status cannot guarantee that the stage position is correct (it cannot detect
the fact that the stage might have been manually moved while the system
was switched oft). The test to see if the stage is correctly initialised is to
compare the actual stage position (read off the stage motors) to the stage
position displayed in the status window. If they are the same then the
stage is correctly initialised.
To initialise the stage:-
1.
2.
3,
Read the stage X position from the stage X motor.
Select stage set X and enter the X position.
Repeat for Y and Z.
Select Stage: set position to send the new position values to the stage
controller.
This last action will cause the stage position in the status window to update (if it
is being displayed).
Stereoscan 440 Overator Manual