objective current center
objective current center
When fluctuations are added to the excitation current of the objective lens, a TEM image spirally enlarges and shrinks. The center of this enlargement and shrinkage is called "objective current center." Alignment of the objective current center is carried out to bring the objective current center to the center of the fluorescent screen for viewing the image by the use of a double-deflection coil system. Since the fluctuations of objective-lens current are small, normally the alignment of the objective current center is not performed, but the alignment of the accelerating voltage center is carried out.
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