Hitachi HV-D30 - Manual (Page 28)

VARIABLE : The shutter speed is VARIABLE value under a line.
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a) 8 to 1/30 (1/25 : PAL) : Long-time frame store mode
4 to 1/30 (1/25 : PAL) : Long-time field store mode
The camera delivers intermittent video signal output. So, to view continuous
images, it is required to use the video memory. A clear image can be attained
even if the subject is illuminated with a faint light source. As the store time
increases, the degree of after-image becomes higher.
Note : With an increase in store time, the degree of characteristic pattern
noise, white scratch, etc. of the CCD image sensor will become higher.
b) 1/60.38 (1/50.31: PAL) to 1/100,000 : Lock scan mode
When an image of a subject display screen having a different scan frequency is
taken, a bright or dark horizontal bar appears to roll up or down the screen.
The shutter speed can be adjusted to where the horizontal bars are minimized
in the display.
Note : If the display screen scanning frequency is less than 60Hz (50Hz PAL),
the rolling horizontal bars cannot be stopped. Not settable in the Auto
CAM mode.
AES : Auto electronic shutter operates in the Limit range setting.
Optimum image level is obtained under strong light conditions.
Effectively used for special optical systems such as microscope or
fixed iris lens which do not have automatic light adjustment
functions. Limit settings can be selected from 1/500 to 1/100000
second
Note: AES cannot be used with Lens Type Video. To use AES with a manual iris
lens, set the Lens Type to DC and Iris Mode to Manual. If the iris opening is
relatively wide in comparison to the DC voltage (manual over-ride lens), set
the Lens Type to DC and the Iris Mode to Auto.
Note: In the Auto CAM mode and the Lens Type is set to DC, the shutter is set to
AES. If Lens Type is set to Video, default is to off.
EXT TRIGGER : External trigger refer to a function for picking up rapidly
moving objects by applying a trigger pulse input.
It is possible to pick up an image with various timing, by the
mode that was set in EXT TRIGGER under 1 line.
3) EXT TRIGGER : external trigger mode
For details of MODE1, MODE2, please refer to Page 27.
4) CCD MODE : CCD store mode
FLD : The field integration mode operation is performed (for ordinary purpose of
application).
FRM : Frame integration mode; although vertical resolution is improved, image
lag is slightly increased. Suggested for still images. At AES Shutter
mode, camera sensitivity is reduced by about 6 dB.
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