ERNITEC BVT-65, Руководство пользователя

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1. Introduction to the Series 65
The Series 65 is designed for the transmission of colour and black & white
composite video signals on twisted pair lines up to a distance of 1000 meters.
The balanced output line driver on the BVT-65 twisted pair video transmitter is
equipped with a galvanic separation circuit in order to eliminate mains ground loop
problems. The Series 65 is fully compatible with other Ernitec twisted pair products,
stand-alone units as well as built-in versions.
2.
Installation
2.1. Box installation
Choose a plane surface to prevent the box from being twisted and thereby becoming
leaky while mounted. When mounted out-door, the box should be oriented with the
cable glands pointing downwards. Screws and plugs are supplied in the mounting kit.
Drilling dimensions is shown on the figure.
2.2. Cable connections
Connect the cables exactly as described on the figure.
Make sure to earth connect the equipment; otherwise the over voltage protection is
inoperative!
2.3. Mains installation
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Terminals marked with hazardous live symbol requires installation by an instructed
person.
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If permanently connected to mains, a readily accessible disconnect device
shall be incorporated in the building installation wiring.
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If pluggable connection to
mains, the socket-outlet shall be installed near the equipment and shall be easily
accessible.
Warning : Do not in any way connect the twisted pair shield to the BVT-65!
If the shield is connected to the transmitter the galvanic separation is inoperative.
3. Adjustment
The best performance is obtained by connecting a video generator to video in on the
BVT-65 and an oscilloscope to video out on the BVR-65 receiver. Check that H2 line
status indication (green LED) is quickly flashing.
If a negative or turned over picture is displayed the twisted pair cable should be
reversed at the receiver Input terminal X1.
1. Set RV1 (gain) to centre position. Set jumper on W1 to position S for cable length
below Approximately 100 meters, position M for 100-300 m cable lengths, and
position L for 300+ m.
2. Adjust RV2 (LF/MF), S1 (MF/HF) and RV3 (HF) for best possible signal response.
3. Adjust RV1 (gain) to 1 Vpp output signal at 75 ohm load.
If a video generator and an oscilloscope are unavailable adjustments should be
carried out in the order shown on the figure.
For optimum picture quality, the use of a video generator and an oscilloscope is
necessary.