IC Realtime 4 Channel Forensic Network Video Recorder - Manual (Page 24)

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The camera and the NVR should have the same grounding to ensure the normal operation of the
camera.
Guarantee stability and reliability of the transmission line
BTTTB
Please use high quality, sound shielded BNC. Please select suitable BNC model according to the
transmission distance.
If the distance is too long, you should use twisted pair cable, and you can add video
compensation devices or use optical fiber to ensure video quality.
You should keep the video signal away from the strong electromagnetic interference, especially
the high tension current.
Keep connection lugs in well contact
BTTTB
The signal line and shielded wire should be fixed firmly and in well connection. Avoid dry joint,
lap welding and oxidation.
BTTTB
3.6.2 Connecting Video Output
Video output includes a BNC(PAL/NTSC1.0V
P-P
， 75Ω）output ,a VGA output and HDMI output.
System supports BNC, VGA and HDMI output at the same time.
When you are using pc-type monitor to replace the monitor, please pay attention to the following
points:
z
To defer aging, do not allow the pc monitor to run for a long time.
z Regular demagnetization will keep device maintain proper status.
z Keep it away from strong electromagnetic interference devices.
Using TV as video output device is not a reliable substitution method. You also need to reduce
the working hour and control the interference from power supply and other devices. The low
quality TV may result in device damage.
3.7 Connecting Audio Input & Output, Bidirectional Audio
3.7.1 Audio Input
These series products audio input port adopt BNC port and video compression card.
Due to high impedance of audio input, please use active sound pick-up.
Audio transmission is similar to video transmission. Try to avoid interference, dry joint, loose
contact and it shall be away from high tension current.
3.7.2 Audio Output
The audio output signal parameter is usually over 200mv 1KΩ (BNC). It can directly connect to
low impedance earphone, active sound box or amplifier-drive audio output device.
If the sound box and the pick-up cannot be separated spatially, it is easy to arouse squeaking. In
this case you can adopt the following measures:
z
Use better sound pick-up with better directing property.
z Reduce the volume of the sound box.
z Using more sound-absorbing materials in decoration can reduce voice echo and improve
acoustics environment.
z Adjust the layout to reduce happening of the squeaking.
3.8 Alarm Input and Output Connection