Dahua Technology LE-A - Manual (Page 23)

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After completing HDD installation, please check connection of data ribbon and power cord.
3.4 Connecting Power Supply
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. See
X283H283H283H287H
Figure 3-1.
X
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
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
7. Connect the HDD cable and
power cable.
8. Place the upper cover back
and screw firmly.