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3.4.2
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(3) Performing a mechanical axial alignment on the objective lens movable aperture
• Set the objective lens movable aperture to the number to be used (normally 2 or 3).
Aperture diameters: 1: 100 µm
2: 80 µm
3: 50 µm
4: 30 µm
• If the image becomes dark, adjust the contrast.
• Use relatively low magnification.
• Adjust the aperture hole adjustment X, Y knobs so that the brightness of the image is
maximized.
X direction Y direction
Fig. 3.4-7 Mechanical Axial Alignment on the Objective Lens Movable Aperture
NOTICE: In some cases, the Beam Alignment shifts after the position of the objective lens
movable aperture is changed. In such a case, a Beam Alignment should be
performed again.
NOTICE: For normal observation, axial alignments should be performed using the
Electromagnetic Alignment. If the objective lens movable aperture is moved, reset
the aperture alignment to a mid-point. After that, adjust mechanically the objective
lens movable aperture to adjust the image so that its brightness will be at a maximum.