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particularly in the central field of view at low magnifications. In such a case, use
Low Mag mode for observation at low magnifications.
Turning Specimen Bias Voltage ON and OFF may cause change of focus,
astigmatism and aperture alignment and need adjustment.
(1-7) Magnetic Sample
Astigmatism correction range is enlarged when the box is checked. Use it for
observation of ferromagnetic specimens such as iron that make astigmatism
correction difficult.
(1-8) Degauss button
The Degauss operation eliminates hysteresis of the magnetic field in the objective
lens.
When focus is changed greatly, accuracy of magnification or alignment of the
electron optical axis may degrade due to hysteresis of the focusing magnetic field.
Click Degauss button under the following conditions:
After changing focus widely.
Before making the electron optical axis alignment.
Degaussing is automatically effected when WD is changed in the Column Condition
raea, when the accelerating voltage is changed, or when a new Probe Current mode
is selected.
(2) LOW MAG MODE block
Probe Current mode and Cond Lens1 are set as same manner as in the HIGH MAG MODE
area.
These are selectable independently to High mag mode because in general the Low mag
mode brings less bright image if operated with the same column condition.
(3) ABCC Link
When the ABCC Link check box has been checked, ABCC will start automatically when some
of the column conditions are changed. Image brightness will be adjusted to adequate value.