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Operation
21
RM/TM-2040GE Series
Figure 12.
External Trigger Timing.
3.5.3
Asynchronous Programmable Exposure Mode
In Asynchronous Programmable Exposure Mode, when an external trigger is applied, the exposure starts after
one discharge signal (Vsub), which happens after the trigger’s active edge is off. Because the discharge signal
(Vsub) synchronizes with LDV in this mode, there is a maximum one video line of jitter between the trigger
active edges to discharge signals (Vsub) off. In this mode, the exposure time from 0 video lines to 2079 video
lines can be controlled through serial communication commands in one video line steps. In this mode, the
minimum exposure time is equal to 0 video lines plus overhead: the maximum exposure time is equal to 2079
video lines plus overhead. Where the specified exposure time is n video lines, the real exposure time is equal
to:
•
If the exposure time is less than one frame time (n < 1219), the maximum trigger frequency is equal to
1/1 frame time.
•
If the exposure time is longer than one frame time (n > 1219), the maximum trigger frequency is equal to
1/ exposure time.
•
The minimum active period of the external trigger is 5
μ
s.
Содержание RM-2040GE Series
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