Ensure stable and reliable line transmission of signal:
Use high-quality, shielded video coaxial cable. Select the right type depending on the transmitting
distance. If the distance is extensive, you should consider the use of cable with twisted pairs, video signal
enhancing devices and fiber-optic cables to maintain the signal quality.
Keep the video transmitting line away from other devices and circuits that generate strong
electromagnetic interference. In particular, protect it against high voltage power surge.
Ensure secure wire connections:
Signal lines and shielded cables should have tight connections. Avoid false soldering and prevent
oxidation of the solder connection surface.
2.5.2 Selection and Connection of Video Output Devices
PAL/NTSC BNC (1.0V
P-P
, 75Ω) video output and VGA output exist （ They can operate
simultaneously）
When using a computer monitor as an alternative surveillance display, pay attention to the following:
1. In order to prolong the life of the equipment, do not leave the monitor power-on for an extended
period of time；
2. Perform demagnetizing regularly to ensure proper working status of the monitor；
3. Keep it away from devices generating strong electromagnetic interference.
TV is not a reliable alternative as the video output device. It also requires minimizing the power-on
time and tight control of interference from surrounding power source and devices. Possible electricity
leakage from low quality TV could result in damage to other devices.
2.5.3 Audio Signal Input
AV interface for audio input.
With higher impedance, active pickup is required.
As with video input, the audio transmission line should minimize interference, prevent inadequate
soldering and faulty connections. Pay special attention to protection against a high voltage power surge.
2.5.4 Audio Output:
The parameter of the DVR audio output signal is usually greater than 200mv 1kΩ (AV). It can be
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