HV-HD201 Op Manual - Hitachi Kokusai Electric America, Ltd.

2) SHUTTER : Electronic shutter mode
Shutter adjusts the light receiving time of CCD. It is used to adjust too bright subject and to reduce
the after-image of the moving object. Using SHUTTER makes the image darker.
Note: If a blinking light source such as a fluorescent lamp is used, flicker occurs. The inverter
fluorescent lamps of high blinking frequency are not like to give influence although the flicker
occurs in case of inverter fluorescent lamps which include low blinking frequency
components.
• OFF : Electronic shutter does not operate.
• PRESET : Shutter operates at the shutter speed set from the following shutter preset speed. It is
selected from 1/100 (59.94Hz mode), 1/60 (50Hz mode), 1/250, 1/500, 1/1000, 1/2000,
1/4000 and 1/10000 second.
• VARIABLE : Shutter operates at the shutter speed set from the following shutter variable speed.
1/59.94 to 1/10087s : (59.94Hz mode)
1/50 to 1/8414s : (50Hz mode)
• AES
: Auto Electronic Shutter
Electronic shutter is automatically controlled according to the brightness of the subject.
Appropriate image level is output even when the amount of light is excessively high.
This function can be used effectively with a microscope having no automatic light
adjustment or a system with a fixed lens iris.
Its shutter speed is limited by the following AES LIMIT setting.
LIMIT can be set in the range below. (AES OFFSET : OFF)
[59.94Hz mode] 1/59.94 to 1/10087s
[50Hz mode] 1/50 to 1/8414s
AES OFFSET
Where fluorescent lamps are driven at 50 Hz, it is sometimes possible to improve
17