Initial Alignment
Gun Alignment
See the Interactive Alignment Demo in JEOL JEM-4000FX TEM.
WARNING USE CAUTION. THE BEAM MAY BE COMPLETELY LOST IF YOU ARE NOT CAREFUL.
| 1. Set the SPOT SIZE=1, MAG=~50 kX. Condense the beam to the smallest spot using the BRIGHTNESS knob. | VIEW | |||||
| 2. Undersaturate the FILAMENT (slowly and slightly) until a cross inside a central bright spot is observed. | VIEW | |||||
| 3. Engage the GUN button in right drawer. Disengage the X 10 button in the right drawer. | VIEW | |||||
4. Using the DEF X,Y knobs in the right drawer, adjust the illumination so a perfect, symmetrical cross is centered in the bright spot. Readjust the brightness to "focus" the cross. |
VIEW | |||||
| 5. Center the illumination using the GUN SHIFT X,Y in the drawer with reference spot on the fluorescent screen. | VIEW | |||||
6. Repeat steps 4-5 if necessary. |
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| 7. Disengage the GUN button. | VIEW | |||||
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