NightWatcher 8 channel D1 Realtime DVR User Manual page 13

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.
The video output is divided into PAL/NTSC BNC (1.0V
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.
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.
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.
3. Use fitment materials that absorb the sound to reduce reflection of the sound.
4. Adjust the layout of the sound box and the tone arm.
Connect the 485 lines of the speed dome with the DVR 485 interface.
Connect the video line with the DVR video input.
Electrify the speed dome.
12
Video output connections and options
Audio input connections
Audio output connections
Speed dome connections
,75Ω) and VGA output (selective
P-P