Hitachi SK-HD1800 Operating Instructions Manual page 38

White and black balance adjustment
Black balance adjustment
Black balance requires adjustment in the following situations.
Equipment being used for the first time
Equipment idle for an extended period
Large change of ambient temperature
Gamma setting changed
1. Set the AUTO W/B BAL switch to ABB for automatic black balance adjustment.
2. The viewfinder displays the following messages during adjustment.
The lens iris is automatically closed.
3. Adjustment is completed in several seconds and automatically stored in memory.
ＡＵＴＯ ＢＬＡＣＫ：
Adjustment in progress
AUTO W / B BAL switch
ＡＵＴＯ ＢＬＡＣＫ：ＯＫ
Adjustment complete
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