Sensoray 817 - Manual (Page 8)

8
System Requirements
Computer requirements
As already mentioned, capture with model 817 does not require a lot of CPU
attention. Usually any computer with a PCI Express slot is adequate. The
application’s requirements are a more significant factor in choosing the right system.
Different motherboards sometimes exhibit performance variations in areas of
memory and bus speeds, depending on chipsets used and other factors. Sensoray
therefore recommends testing systems/motherboards with model 817 board before
committing to large quantities.
Video source requirements
Model 817 accepts standard NTSC or PAL signals, as well as standard 60 Hz and 50
Hz monochrome TV signals. The video inputs on the 817 board are terminated with
a 75 Ohm resistor.
It is not recommended to simultaneously connect the video source to the input of the
model 817 and another 75 Ohm terminated input. This may reduce the quality of the
captured images and cause synchronization problems.
Because of the specifics of the board’s design the 817 works better with the video
sources asynchronous relative to each other, which is usually the case. It is not
recommended to synchronize the cameras used with the model 817 because it may
cause decrease in the performance (capture frame rate).
It is not recommended to switch the input signal from one TV standard to another
while the board is capturing. This may result in a lock up requiring software restart.