Hitachi HV-F31CL Operation Manual page 58

(2) Pulse width control exposure mode: Mode 1
When external trigger signal is high active,
light pulse begins at the rising edge of the
trigger signal and ends at the falling edge.
At the trigger signal falling edge, the internal
VD signal is reset and the video data are
transmitted.
The flash pulse output that synchronizes to
external trigger is not used in this mode.
Trigger pulse width > 65us
External Trigger
(High active)
minimum period = 1V
Exposure
A
Internal VD
Internal Video
VD : 3H = 186us
blank : 26 to 27H = 1678us
DATA transfer
External Trigger
1H(cam)=
62us
Internal HD
6 to 7H(cam) = 373 to 435us
Internal VD
Exposure
4.0us
21us
Internal Video
DATA transfer
1 Frame = 66.7ms
15FPS
A B C
A
Frame reset
3H(cam) = 186us
20H(cam) = 1243us
DATA transfer START: 1.75ms
D
A
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