How to Attain Better Images
Black Balance Adjustment
Adjust black balance to provide proper color tone at a dark part of video image. In the
following cases, be sure to carry out black balance adjustment.
When using the camera first after purchasing it.
x
x
x
When using the camera after it has been unused for a long time.
When the camera operating environment is changed (e.g., when the ambient
temperature varies significantly).
Under normal condition, it is not required to make black balance adjustment at power-
on.
1. In the menu mode, carry out automatic black balance adjustment. At the end of
successful adjustment AUTO BLACK:OK appears.
Notes: 1) Where the lens having the auto iris function is used, the iris is closed
automatically during adjustment.
2) In combinational use with the manual iris lens or microscope, a full-black
screen image is provided from the CCD image sensor during adjustment.
When picturing after adjustment, a white screen image appears
momentarily. This phenomenon is not a symptom of trouble, however.
3) In case that the manual iris lens is used, do not attempt auto black balance
adjustment while taking an image of subject having extremely high
luminance such as the sun. This may deteriorate black balance accuracy.
2.
If black balance adjustment cannot be made, any one of the following messages will
appear. Take a proper procedure according to the error message, and then try
black balance adjustment again.
Error message
Procedure
AUTO BLACK
㧦
BAR
Turn off the color bar.
AUTO BLACK
㧦
NG
Close the lens iris.
Avoid taking an image of subject having high luminance
such as the sun, or decrease illumination on the
microscope.
Carry out AUTO BLACK again. If this message appears
in repeated attempts, it is necessary to inspect the inside of
the camera. In this case, notify your local Hitachi Denshi
sales agent or Hitachi Denshi service office
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