Dahua HCVR21**HS-S2 Series, User Manual

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HDCVI Series DVR User
’s Manual
97
Please check input voltage and device power button match or not.
We recommend you use UPS to guarantee steady operation, DVR life span, and other peripheral
equipments operation such as cameras.
3.5 Connecting Video Input and Output Devices
3.5.1 Connecting Video Input
The video input interface is BNC. The input video format includes: PAL/NTSC BNC
（
1.0V
B
P- P ，
B
75Ω.
）
The video signal should comply with your national standards.
The input video signal shall have high SNR, low distortion; low interference, natural color and suitable
lightness.
Guarantee the stability and reliability of the camera signal:
The camera shall be installed in a cool, dry place away from direct sunlight, inflammable, explosive
substances and etc.
The camera and the DVR should have the same grounding to ensure the normal operation of the
camera.
Guarantee stability and reliability of the transmission line
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
The signal line and shielded wire should be fixed firmly and in well connection. Avoid dry joint, lap
welding and oxidation.
3.5.2 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:

To defer aging, do not allow the pc monitor to run for a long time.

Regular demagnetization will keep device maintain proper status.

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.
3.6 Connecting Audio Input & Output, Bidirectional Audio
3.6.1 Audio Input
These series products audio input port adopt BNC port.
Due to high impedance of audio input, please use active sound pick-up.