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2.5 Audio and video input and output connections
2.5.1 Video input connections
The video input port is a BNC connector plug. The type of input signal is PAL/
NTSC BNC(1.0VP-P,75Ω).
The video signal must be of the correct standard and have a high signal to noise
ratio, low aberration and low interference. The image must be clear and have
natural color and brightness in the environment in which it is to operate.
Insure the vidicon signal is stable and credible
The vidicon should be installed in a suitable location where is away from
backlighting and low illumination or uses backlighting and low illumination
compensation.
The earth and power supply of the vidicon and the DVR should be shared and
stable.
Insure the transmission line is stable
The video transmission line should be a high quality coaxial pair which is suitable
for the transmission distance. If the transmission distance is too great, you should
use shielded twisted pair, video compensation equipment or transmit by fiber
optics to insure the signal quality.
The video signal line should be away from all electro magnetic Interference and
other signal line equipment. High voltage current should be especially avoided.
Insure the connection is stable
The signal and shield lines should be connected with a tight connection which
will help avoid false signals, joint welding and oxidation.
2.5.2 Video output connections and options
The video output is divided into PAL/NTSC BNC(1.0VP-P,75Ω) and VGA output
(selective configuration).
If you replace your Qvis monitor with a computer display, there are some issues
to take note of.
1). Do not leave the display turned on for a long time.
2). To ensure normal working demagnetize regularly.
3). Keep the display away from electro magnetic Interference.
A TV is not a suitable replacement for a video output. It can only be used for a
short period of time and is particuarly suseptabler to nearby interferance. The TV
can also damage other equipment.
2.5.3 Audio signal input
The audio port is a BNC connection.
As the input impedance is high, the tone arm must be active.
The audio signal line should be strong and away from any electro magnetic
Interference and with a credible connection which should avoid false signals and
joint welding and oxidation. High voltage current should be especially avoided.
