DDF4820HDV-DN-IM/-SM
www.dallmeier.com
13
4 Requirements
4.1
General
Unfavourable local conditions may shorten the life of the products and may cause mal-
functions or damages.
Do not install/operate the devices in places
•
with a large amount of dust and dirt,
• with steam or oil vapours (e.g. kitchen),
•
with direct sunlight,
• with strong heat emissions (e.g. radiator),
•
with improper ambient temperatures,
• near sources with strong radiation (e.g. radio transmitters, magnetic fields),
• with corrosive surroundings (e.g. gases, salt water),
• with insufficient air ventilation (e.g. closed cabinet).
4.2
Power Supply
The devices can be powered via PoE (Power over Ethernet, Class 0) or supplied with
12 V DC (separate power supply unit required).
Ensure that the existing network supports the PoE standard IEEE 802.3af if you want
to supply the devices with power over Ethernet.
4.3
Earthing & Equipotential Bonding
For the safety of persons (protection against dangerous contact voltages) and devices
(protection against overvoltages) and the immunity of information and communication
technology equipment to electromagnetic interferences (EMI), all protective measures,
which are specified by the currently valid DIN, VDE and ISO standards and which provide
for a standard-compliant earthing and a correct equipotential bonding of electrical and
electronic devices, are mandatory and must be fulfilled by all means.
4.4
operation
Observe the following notes for the operation of the devices:
•
If the devices or the cables connected to the devices are located near sources with
strong radiation, the video image may be distorted.
• The devices are equipped with an automatic gain control (AGC). In low light condi
-
tions the image may be altered (e.g. noise). However, this is not a malfunction.
•
The quality of the video image depends on the lens, the lighting conditions and the
used monitor.
• The accuracy of the automatic white balance (AWB) algorithm depends on the light
-
ing used. Mixed light (consisting of artificial light and daylight) may cause colour
distortions (inaccurate colour reproduction).
•
Poor lighting can lead to a faulty white balance.
