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1.3 Video 3 Board Operation:
The Video 3 Input board accepts four video input signals from cameras via SMB electrical
connectors.
The four video signals are digitized by 10-bit analog-to-digital (ADC)
converters. The older Video 1 and 2 boards used 8-bit ADCs so the video resolution has
been improved by a factor of four. The corresponding Video 3 Output board at the other
end of the link accepts the four digitized video signals and converts them back to analog
signals via digital-to-analog (DAC) converters.
The video channels are unidirectional and the direction depends on whether the board is a
Video 3 Input or Output. Video 3 boards work in pairs of one input and one output board.
When using multiple pairs, proper board pair addressing is critical. Surface unit Video
board #1 must be configured to work with the sub-sea unit's Video board #1 and surface
unit Video board #2 must be configured to work with the sub-sea unit's Video board #2.
This is accomplished by setting the 4-position DIP switch (SW1) to "BD1" for board #1 or
"BD2" for board #2 as appropriate. There are two other positions, "BD3" and "BD4",
but these are not used and reserved for future applications. The board number ("Board 1"
or "Board 2") is imprinted on the Video 3 board extractor handle ID tag and the ID tag
should be changed to reflect the current board identification number, if board ID addresses
are changed. On Video 3 Input boards, a jumper shunt must also be placed on JP30 at
"TD19" if the board is configured for "Board 1" or on JP30 at "TD18" if configured for
"Board 2".
1.3.1 Video 3 Board Indicator and Controls:
There are two LED power indicators on the front panel of the Video 3 board labeled +5 and
-5. (+5 volts DC and -5 volts DC) The green +5 and -5 LEDs are lit whenever +5VDC
power and -5VDC power are available to the board.
Each video channel on both the Video 3 Input and the Video 3 Output board has a yellow
LED (LED2 through LED5) that lights to indicate that a video (or analog signal of sufficient
amplitude) signal is present on that channel.
Video 3 Input and Output boards have four trim pots (one for each video channel) that are
accessible through the front panel adjustment holes (labeled VR1 through VR4) and are
used to adjust gain.
1.3.2 Video 3 Board Specifications:
Number of Channels: 4 video
Video Sample Rate:
Video Bandwidth:
Video Quantizing:
1.3.3 Video 3 Board Dimensions:
VME 3-U format. 100 mm wide x 160 mm long x 20 mm thick
VIDEO 3 Input/Output Boards
12.5 Msps typically
6 MHz typically
10-bits or 1024 levels
(3.937 in x 6.299 in x 0.80 in)
Page 5 of 7
February 24, 2009
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