Cheetah KAC Camera User Manual | Camera Link (CLF) Interface
October 1, 2019
Page
95
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135
Rev 7.2
Figure 55: Global shutter with 8.33 ms exposure time.
With an external trigger, exposure times and read-out times do not overlap, and the
effective frame time is the sum of both values.
Figure 56: Global shutter with a long exposure time (integration time).
5.7.2 External Exposure Control
When using the external trigger (whether with the internal exposure timer or with trigger
pulse width), the exposure and readout are not overlapped.
When using the internal exposure timer and external trigger, the following sequence
occurs:
1.
The camera waits for the trigger signal.
2.
Upon trigger, there is a delay of ~45 microseconds plus 1 to 2 line times.
3.
Then the exposure time begins followed by readout.
4.
The camera then idles and awaits the next trigger.
The camera can control exposure using an external pulse; the pulse duration determines
the exposure. In global shutter mode, the minimum exposure time is about 6
microseconds. In rolling shutter mode, the minimum exposure time is equal to the frame
time, because the exposure must occur during the read-out time. Refer to the Camera
Triggering section and the I/O Control section.
