I I. Focusing DeYice
• The rotation of the coarse focus and fine focus knobs
move the revolving nosepiece vertically. A sample
placed on the stage can be focused by rotating these
focus knobs. Figure right shows the relation between
their rotation and the nosepiece movement.
• One rotation of the fine focus knob moves the
nosepiece 0.1 mm. The minimum reading of the scale
on the fine focus knob moves the nosepiece 1 µm.
• Rotation of the coarse focus torque adjustment ring
adjusts the tension felt in the rotation of the coarse
focus knob. Rotating this adjustment ring counter
clockwise increases this tension.
Coarse focus torque
adjustment ring
►
---------------------------------,
Never rotate simultaneously the
right and left focus knobs in
opposite directions. If rotated
this way, they may cause
malfunction.
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