Silicon Imaging SI-2K User Manual page 28

The frequency of having to SET BLACK will depend on the shooting environ-
ment and the subject matter. Typically after approximately five minutes from a
cold boot, the camera will reach a temperature stabilization point where any
further deviation will be insignificant compared to that which occured in the
first five minutes.
Another black recalibration may not be necessary for hours thereafter, espcially
if one is shooting complex scenery or brighter scenery that is not against dimly
lit flat white subject matter (where fixed pattern noise, if it's apparent will typi-
cally be the most visible). If one is shooting in hot environment, or is changing
the environment rapidly, black recalibrations may be necessary.
Also for dark scenes where the shadows are gained up higher, black recalibra-
tion may be required more often to make sure that there are no inconsistencies
in the blacks with fixed pattern noise that gain may result from temperature
variations within the camera as it runs.
SiliconDVR and Operating System
SiliconDVR Software is a Windows Application. The SI-2K Digital Recording
Unit runs an embedded Windows Version.
SiliconDVR Interface has been designed to record and playback files and to
embed metadata such as non-destructive colour information or timecode.
The Interface is mainly designed for touchscreen use for smooth and quick
operation. However it is also possible to control it via mouse or touchpad sys-
tems.

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 SI 2K Manual