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3.5.4 Image Brightness and Contrast Adjustment
Image brightness and contrast can be adjusted both manually and automatically.
BC Monitor mode is also available for manual adjustment.
The Beam Monitor function is provided to reduce the tip noise.
(1) Auto Adjustment (ABCC)
Click the ABCC icon
on the control panel or select the ABCC command from Operate
menu to start auto-adjustment.
If the results of ABCC are not adequate, you can change the reference brightness and
contrast on the Image tab in the Setup dialog window.
NOTICE: Beam Monitor adjustment (adjustment of a reference voltage) is activated
automatically at the start of ABCC function if Adjust Beam Monitor is checked in the
ABCC area of the Image tab in the Setup dialog window. Normally, set this to ON
(checked box). Set it OFF in special cases such as when the Beam Monitor reference
signal needs to trace the drift of the emission current; for example, during quantitative
X-ray analysis using a probe current drift cancellation function, etc..
ABCC may fail to operate if started when contrast is too high, especially in Analysis
mode where the probe current is high. In such a case, adjust the contrast manually,
and then use the ABCC function.
ABCC is also available for YAG BSE and TE detector signals. Not available for other
optional detector signals.
When the Dual Screen mode is used, ABCC is applied to the signal of the selected
screen by the Signal (A / B) selection on the control panel.
(2) Manual Adjustment
Use Brightness and Contrast knobs on the manual operation panel.
On the GUI screen, mouse operation is also available.
Move the mouse cursor to the top right quadrant of the image where the mouse cursor
changes to the B/C cursor
. Drag the mouse holding down the left button to adjust
brightness; holding down the right button to adjust contrast. Drag it to the right to increase and
to the left to decrease brightness or contrast.