dallmeier DF4900HD, Руководство по установке и настройке

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DF4900HD / DF4500HD
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6.2 Installation and Commissioning
The camera has a ¼" tripod socket located on the top and bottom side.
Notice
Damage to the device by inappropriate mounting equipment

Use the correct type of of mounting equipment:
• ¼" tripod screw (max. length 7 mm) for ceiling/wall bracket
• Weather-proof housing for outdoor installations

Mount the camera with an appropriate tripod screw on the ceiling/wall bracket.

Connect the required cables to the connectors on the camera back side.

Connect a CVBS monitor to the video preview output.

If PoE (Power over Ethernet) is not available, connect the camera to a suitable power
supply unit and then connect the power supply unit to the mains socket.

Align the camera and set the focal length and focus.

Disconnect the CVBS monitor.
6.3 Back Focus
The back focus (focal flange length) is the distance between the rear lens element and the
image sensor. Optimum focus is only possible if the correct distance is set.
It may be necessary to adjust the back focus in individual cases due to production toler-
ances of the lens.
To adjust the back focus, the iris of the lens must be open as wide as possible (smallest
iris value). For lenses with automatic iris control, you will require a ND filter (gray filter) to
prevent the iris from closing in bright light.
6.3.1 Adjustment for Lenses with Fixed Focal Length
If the focus cannot be set exactly with the focus ring of the lens, proceed as follows:

Point the camera at an object with sufficient contrast.

The distance to the object should be greater than 1000× the focal length.

Open the iris of the lens.

Set the distance at the lens to infinity (∞).

Loosen the locking screw of the back focus adjustment ring.

Set the optimum focus with the back focus adjustment ring.

Tighten the locking screw of the back focus adjustment ring
6.3.2 Adjustment for Lenses with Variable Focal Length (Zoom Lens)
If the focus changes as the focal distance changes, proceed as follows:

Point the camera at an object with sufficient contrast at a distance of approx. 2 m.

Open the iris of the lens.

Set the maximum focal length (tele end) at the lens.

Set the optimum focus with the focus ring of the lens.

Set the smallest focal length (wide end) at the lens.