H.264 Network Digital Video Recorder User Manual
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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.
Insure the connection stable and credible
The signal and shield lines should be firm and connected credible which avoid false and joint welding and
oxidation.
2.6.2 Video output connections and options
The video output is divided into PAL/NTSC BNC(1.0V
P-P
,75Ω) 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 credible 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.
2.6.3 Audio 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 credible
which avoid false and joint welding and oxidation. The high voltage current should be avoided especially.
2.6.4 Audio output
Commonly the output parameter of DVR audio signal is greater than 200mv 1KΩ(BNC) which can connect
the low impedance earphone and active sound box or other audio output equipments through power amplifier.
If the sound box and the tone arm can not be isolated, howling phenomena is often existed. There are some
methods to deal with the above phenomena.
1
、
Adopt better directional tone arm.
2
、
Adjust the sound box volume to be under the threshold that produces the howling phenomena.
