Variable frame rate
<Notes>
In this unit, the frame rate is set by changing the storage time of the optical signals sensed by the CCD. Depending on the frame rate setting, the following problems may arise.
1White streaks
The dark current of the photodiode that configures the CCD’s pixels causes defective pixels to arise, and this results in the appearance of white streaks on the screen. This current increases in direct proportion to the rise in the CCD’s temperature and storage time in the photodiode.
In short, the white streaks increase in inverse proportion to the frame rate setting.
When a lower frame rate setting is desired, reduce the master gain setting and, where possible, avoid direct sunlight and use the unit in a cool environment.
2Delayed response time in automatic processing When the frame rate setting has been lowered, it takes longer for the unit to perform the automatic processing (such as auto white balance, flare compensation, auto knee and auto iris), possibly giving the user the impression that something is odd or wrong.
The response time for automatic processes is particularly slow at a frame rate of 20 fps and below.
When the frame rate has been set to 20 fps or below, it is recommended that the unit be operated with the automatic processing released.
3Disturbed images
The images may be disturbed for a moment if
The disturbed images are not recorded on the tape but they will affect the signals which are output from the HD SDI OUT connector.
Furthermore, if the time code is allowed to advance in the free run mode when the frame rate is set to 24 fps or 30 fps, at that instant when the time code is preset or the time code is locked to the external signal, the images may be disturbed for a moment.
63 (E)
