JVC VN-C655U - Manual (Page 6)

6
Introduction
Operating Precautions (continued)
Ⅵ The camera incorporates an AGC circuit. As a re-
sult, when it is used under low light conditions, the
camera gain may increase automatically. This
makes the picture appear uneven , however this is
not a malfunction
Ⅵ When equipment that generates strong magne-
tism such as a transceiver is used near to the unit
while the AGC circuit is ON, beat noise, etc may
interfere with the picture. If a transceiver or similar
equipment is used, keep it at a distance of at least
3 metres (10 feet) away.
Ⅵ If VN-C655 and the cables connected to VN-C655
are installed at a location where strong electrical
or magnetic waves are generated, near a radio,
TV set, transformer, motor etc., the quality of im-
age and color may be affected.
Ⅵ In auto iris mode, when the AGC circuit is ON, vary-
ing the iris with the iris control button may not
change the picture brightness. This is due to the
automatic gain boost by the V.Networks Control-
ler. In this case, set AGC to OFF or use the manual
iris mode.
Ⅵ In auto iris mode, the V.Networks Controller may
not function under certain brightness conditions
(i.e. when a sufficient amount of light cannot be
obtained). In this case, set the iris mode to manual.
Ⅵ When the camera is used in ATW (Auto White bal-
ance) mode, the colors captured by the camera
may differ from the actual colors being shot due to
the mechanics of the auto-tracking operation within
the white balance circuit. However, this is not a
malfunction.
Ⅵ If a very bright object (such as a lamp) is being
monitored, the picture may contain vertical lines
(smear) above and below the bright object in the
picture. This is a normal phenomenon for solid-
state image pickup devices (CCD) and is not a
malfunction.
Ⅵ When the camera is used to monitor the same
position over many hours ( e.g. continuously for 24
hours a day) the contact resistance of the panning
mechanism may increase. This may cause the
picture to be affected by noise interference or the
V.Networks Controller operation becoming un-
stable. To prevent this happening, once a week,
turn the system off and on in order to initialize the
camera and to clean the contacts.
Ⅵ Do not touch the lens on the dome cover directly
by hand. Contamination of the cover will lead to
deterioration of the picture quality.
Ⅵ Since the dome cover is of a hemispherical shape,
the picture tends to become distorted at the edges
of the hemisphere. When the camera is tilted and
pointed in the horizontal-direction, the picture may
be out of focus because the camera will then cap-
ture the edges of the hemisphere.
Ⅵ When an object is located near a light source or
contains a large difference in brightness, ghosting
may occur. This phenomenon is due to the char-
acteristics of the dome cover and the built-in lens
and is not a malfunction.
Ⅵ Make sure to use the supplied AC adaptor.
Ⅵ Certain hubs and switches equipped with SNMP
functions have a broadcast or multicast control func-
tion. If the function is enabled, multicast images
created by this product may not be viewed prop-
erly.
Ⅵ Do not connect cameras other than VN-C655 to
the ceiling-mounting bracket. This may cause the
equipment to malfunction.
VN-C655(reed me)_p2-29 04.9.22, 8:18 PM 6