Initial Alignment

Condenser Astigmatism Correction

See the Interactive Alignment Demo in JEOL JEM-4000FX TEM.

1. Set the SPOT SIZE=1, MAG=~50 kX.
2. Condense the beam to the smallest spot using the BRIGHTNESS knob.	VIEW	Click VIEW again to hide. Click image to open a large version in a new window.
3. Engage the COND LENS STIGMATOR.	VIEW	Click VIEW again to hide. Click image to open a large version in a new window.
4. Turn on the X 10 button in the right-hand drawer.	VIEW	Click VIEW again to hide. Click image to open a large version in a new window.
5. Focus the filament image (cross) using the DEF X,Y knobs in the right drawer. The image will appear out of focus and oval-shaped as you focus/defocus the illumination. The astigmatism is corrected when the filament image (cross) is in sharp focus inside a round spot of illumination.	VIEW	Click VIEW again to hide. Click image to open a large version in a new window.
6. Repeat steps 2-5 until the filament image is in sharp focus.
7. Disengage the COND LENS STIGMATOR button.	VIEW	Click VIEW again to hide. Click image to open a large version in a new window.