Stereo Scan 440 - DCU

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Running the Filament Up
Standard run-up macros for Denka and Kimball LaB6 filaments are provided by
Leica. These will set the EHT to 5kV and the filament current to a value
normally below the saturation point for the appropriate filament type. It is
recommended that these are used initially when running with LaB6 and then
when the desired operating conditions are achieved that additional run-up macros
are created for future use.
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Kimball
To select the appropriate macro select File from the top menu line followed by
Load state. This produced a list of application macros from which the
appropriate run-up macro can be selected. Select DenkaS.app for Denka M3
filaments and KimbS.app for Kimball Physics filaments.
filaments run with a much lower heating current so the selection of
an incorrect macro could result in the filament being destroyed.
Once Open has been selected the macro will be loaded and run up of the filament
will commence. If there is a conflict between the conditions in the macro and
those currently set on the system then the macro will halt and a warning will be
given and the Operator will be asked whether or not to proceed. It is advisable to
select No and to investigate the reason for the conflict. Once this has been
corrected then the macro can be loaded and run again.
Once the run up sequence is completed it is advisable to check for correct
filament saturation and beam alignment. Use the Gun Align panel to select
Emiaion Image mode and adjust the filament cuuent to produce the desired
emission image (see Figures 9,10,11,12).
Stereoscan 440 Operator Manual