| A. Startup Checklist 1. Is the green Ready light on?
2. Turn on the nitrogen gas, large valve first.
3. Press the yellow Console button.
4. Press the orange Image button.
5. Has an image appeared on the screen?
Adjust the Brightness, if necessary.
6. Check the filament alignment.
7. Check the alignment of the final aperture.
8. Turn on the computer and the Avalon.
Logon: username:
phlab
password: electron |
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C. Shutdown Checklist
1.
Return to the TV image.
2. Turn
the magnification knob to Low.
3. Move
the Zoom lever all the way down.
4. Move
the specimen holder back to the center so
you are looking at the head of the screw.
5. Press
the green Ready button.
6. Press
the yellow Console button.
7. Turn
off the nitrogen gas, small valve first.
8. Turn
off the computer and Avalon.
9. Turn off
the lamp(s) and room lights. |
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If you have
questions call:
Nathan
Frank (309-794-3402)
Bob Frank (309-786-3209)
or Dave Renneke (309-786-5247)
Last update:
September 28, 2009
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B. Changing
Specimens
1.
Press the green Ready button to shut off
the
beam.
2. Check
to be sure the nitrogen gas is turned on.
3. Press
the brown Air button and unlatch the
chamber door.
4. When
the door opens (after about a minute),
temporarily shut off the flow of nitrogen with the
small valve.
5. Change
specimens.
6.
Close the chamber door and hold it
shut without
latching it.
7. Press
the green Pumping button. After you hear
the pumping value click open, latch the chamber
door.
8. Open
the small nitrogen valve.
9. Wait
for the green Ready light to come on before
pressing the Image button. This will take
several minutes. Watch the Pirani and high
vacuum gauges to monitor the progress. |
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Filament Operating
Conditions
LaB6
Filament
Current 1.92 A
Beam Current 20
mA
Tungsten
Filament Current 2.8 - 3.1 A
Beam Current 150
mA
A new LaB6
filament was installed in April, 2008. |
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