Using The Frame Trigger Wait Signal To Avoid Overtriggering The Camera; The Causes Of Overtriggering - Basler GIGE VISION ace acA640-100gm/gc Manual

Image Acquisition Control
6.10 Using the Frame Trigger Wait Signal to

6.10.1 The Causes of Overtriggering

When you are using a hardware trigger to control frame acquisition, there are two situations that will
result in an overtrigger condition:
Situation 1 -You have the camera set for the timed exposure mode and you attempt to start a new
exposure while a previously triggered exposure is still in progress. This situation is illustrated in
Figure 41 for a rising edge frame start trigger signal. (The figure illustrates the situation with
overlapped exposure and readout, but this type of overtrigger would still happen even if there was
no overlap.)
ExFSTrig
Signal
Exposure
(exposure duration
determined by the
exposure time
parameter)
Fig. 41: Overtriggering in Timed Exposure Mode
90
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Avoid Overtriggering the Camera
Frame Acquisition N
Readout
Frame Acquisition N+1
Exposure
Because the exposure for acquisition N+2
is currently in progress, this rise in the
trigger signal will be ignored, and a Frame
Start Overtrigger event will be generated.
Readout
Frame Acquisition N+2
Exposure Readout
Exposure
Time
Frame Acquisition N+3
Readout
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