Photron FASTCAM-PCI R2, Hardware Manual

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FASTCAM-PCI R2 Hardware Manual
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3.4.4. Delay of EXT OUT Signals
For 2-camera operation, the vertical sync and trigger signals are connected with BNC cables as
shown in below. It is known that the BNC cable causes considerable delay of signals between the
PCI boards, the delay being proportional to the length of the cable.
In addition to the delay, the quality of signal also deteriorates proportionally, which may cause the
the slave camera to malfunction.
For stable, synchronized operation of cameras, it is recommended that the cable length is reduced
as much as possible when designing a simultaneous recording system.
The below table shows actual signal delays measured using type 3C2VS BNC cables.
Cable Length
(Meters)
Delay
(nsec)
5 25
10 50
20 100
30 150
40 200
50 250
Master Board
Slave Board
TRIG OUT
SYNC OUT
SYNC IN
T-TTL IN