7
ratio, low aberration and low interference. The image must be clear and has natural color in the
appropriate brightness.
Make sure the video signal stable and in good condition
The video should be installed in the appropriate location where is away from backlighting and low
illumination or adopts the better backlighting and low illumination compensation.
The ground and power supply of the video and the DVR should be shared and stable.
Make sure the transmission line stable and in good condition
The video transmission line should adopt high quality coaxial pair which is chosen by the
transmission distance. If the transmission distance is too far, it should adopt shielded twisted pair,
video compensation equipment and transmit by fiber to insure the signal quality.
The video signal line should be away from the electro magnetic Interference and other
equipments signal lines. The high voltage current should be avoided especially.
Make sure the connection stable and in good condition
The signal and shield lines should be firm and connected in good condition which avoid false and
joint welding and oxidation.
1.8.2 Video output connections and options
The video output is divided into PAL/NTSC BNC(1.0V
P-P
,75
Ω
) and VGA output(selective
configuration).
When replace the monitor by the computer display, there are some issues to notice.
1, Do not stay in the turn-on state for a long time.
2, Keep the computer display normal working by demagnetizing regularly.
3, Stay away from the electro-magnetic Interference.
TV is not a good replacement as a video output. It demands reducing the use time and control
the power supply and the interference introduced by the nearby equipments strictly. The creepage of
low quality TV can lead to the damage of other equipments.
1.8.3 Audio signal input
Audio port is RCA connection.
The input impedance is high so the tone arm must be active.
The audio signal line should be firm and away from the electro magnetic Interference and
connected in good condition which avoid false and joint welding and oxidation. The high voltage
current should be avoided especially.
1.8.4 Audio signal output
Commonly the output parameter of DVR audio signal is greater than 200mv 1K
Ω
(BNC) which
