Dahua iDVR&iHCVR
User’s Manual
37
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.
BT TT
3.5.2 Connecting Video Output
Video output includes a
T
BNC(PAL/NTSC, 1.0VP- P
，
75Ω
）
output, a VGA output and a
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
RCA port is adopted for audio input port.
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.
3.6.2 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:
Use better sound pick-up with better directing property.
Reduce the volume of the sound box.
Using more sound-absorbing materials in decoration can reduce voice echo and
improve acoustics environment.
Adjust the layout to reduce happening of the squeaking.
3.7
Alarm Input and Output Connection
Please read the followings before connecting.
1. Alarm input
a. Please make sure alarm input mode is grounding alarm input.
b. Grounding signal is needed for alarm input.
c. Alarm input needs the low level voltage signal.
Summary of Contents for iDVR&iHCVR
Page 1: ...Dahua iDVR iHCVR User s Manual Dahua iDVR iHCVR User s Manual V1 1 0 ...
Page 126: ...Dahua iDVR iHCVR User s Manual 117 Figure 4 90 Figure 4 91 Figure 4 92 ...
Page 132: ...Dahua iDVR iHCVR User s Manual 123 Figure 4 97 Figure 4 98 ...
Page 133: ...Dahua iDVR iHCVR User s Manual 124 Figure 4 99 Figure 4 100 ...
Page 136: ...Dahua iDVR iHCVR User s Manual 127 Figure 4 104 Figure 4 105 ...
Page 202: ...Dahua iDVR iHCVR User s Manual 193 Figure 5 56 Figure 5 57 ...
Page 211: ...Dahua iDVR iHCVR User s Manual 202 Figure 5 69 Figure 5 70 Figure 5 71 ...
