Smartwares 10.001.40 Manuel D’Utilisation
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2. Perform demagnetizing regularly to ensure proper working status of the monitor
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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
directly connected to low impedance headphones, powered speakers or drive other audio output devices
through an amplifier. If spatial isolation cannot be established between external speakers and pickups, it
could result in a whistling sound. In the event, you may:
1
、 Use pickups with better directivity;
2
、 Adjust speaker volume to the level below whistle threshold;
3
、 Use sound-absorbing materials in the working environment to reduce sound reflection and
improve room acoustics;
4
、 Adjust the layouts of pickups and speakers to reduce the occurrence of whistling.
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３.Connections to PTZ
A.
The PTZ decoder must share a common ground with the DVR or possible presence of
common-mode voltage may cause you to lose control of the PTZ.
We recommend shielded twisted pair cable with its overall shield being used for common
ground;
B. Prevent against high-voltage power surge. Wire cables must be able to protect equipment from
lightning
C. Connect a 120 Ohm resistor in parallel at the far-end to reduce reflection and guarantee the
signal quality;