Samsung SCC-B2311 Manuel D'utilisation page 22

camera in the internal sync mode occurs a skip every time
it moves to other scene. However, this can be solved by
positioning the L/L switch to ON and using the level bar to
adjust the vertical sync phasing.
E
- If your camera uses DC 12V for power source, it operates
in the internal mode regardless of the position (On/Off) of
the L/L switch.
2) SW2(ELC) :
Use this for the manual iris lens. If set to ON, the electronic
shutter speed varies between 1/60 and 1/120,000 second
to keep the screen brightness proper. However, you must
position this switch to OFF if you are using the auto iris
lens (DC or Video control type). Because, in this mode, the
camera can show the color rolling effect when operating
under the mechanical fluorescent lightning. If this happens,
apply the AC power and set the SW1 (L/L) to ON. (NTSC:
60Hz, PAL: 50Hz)
3) SW3 (FL) :
It is an anti-flicker system in 50Hz areas for NTSC and,
in 60Hz areas for PAL that prevents the flickering of the
image due to mismatch between the vertical sync frequency
and the on-off frequency of the lightning. If set to ON, the
electronic shutter speed stays at either 1/100sec (NTSC) or
1/120sec (PAL).
※Note : If SW2 (ELC) is set to ON, the anti-flicker system
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does not work even if SW3 is positioned to ON.
User's guide