How to Attain Better Images, Auto Black BAR

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.

ξ When using the camera first after purchasing it.

ξ When using the camera after it has been unused for a long time.

ξ 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	BAR	Turn off the color bar.
AUTO BLACK	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