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7. ALC LEVEL ADJUSTMENT POTENTIOMETER FOR DC DRIVE LENS
This potentiometer is used only if the camera is fitted with a DC drive autoiris lens. It is used to control
the amount of light striking the CCD image sensor.
LENS-IRIS level control
Monitor Screen
To increase the brightness
To decrease the brightness
8. POWER IN (24 VAC)
This terminal accepts 24 VAC power source. Recommended power supply is minimum 9 W (when not
using PoE).
Caution: To prevent fire or shock hazard, UL Listed wire VW-1, style 1007 should be used for the
cable for 24 VAC input terminal.
9. POWER INDICATOR LED
This LED turns ON only when power is supplied and the DC-DC converter (or the regulator) inside the
camera works properly or PoE is functioning.
10. CCD DUST PROTECTIVE CAP
Remove this cap before installing the lens. Do not handle or leave the camera with cap off.
12. BACKFOCUS ADJUSTMENT
This is used to position the CCD image sensor at the precise point of focus the lens.
Backfocusing Fixed-Focal-Length Lenses
1. Install a lens and connect the camera to a monitor and power supply.
2. Open the iris completely. If an autoiris lens used, reduce the room lighting to allow the lens to open
completely. This gives the most accurate results.
3. Adjust the screw slowly until the sharpest picture is obtained. This completes the adjustment. The
backfocus adjustment screw is held in place by friction, so there is no locking screw.
Backfocusing Zoom Lenses
1. Install a lens and connect the camera to a monitor and power supply. If the lens is motorized, it must
also be connected to a lens control.
2. Position the camera 25~50 feet (8~16 meters) from a flat vertical surface suitable for focusing. A
newspaper works well as a focusing target.
7
LEVEL Control Direction
Counterclockwise
XX181-02-00 Rev 1107 VN-855 Ver 3 IP Camera
Clockwise
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