Image Acquisition Control AW00123409000
130 Basler ace USB 3.0
Note that, if you attempt to trigger a new exposure start while the previous exposure is still in
progress, the trigger signal will be ignored, and a Frame Start Overtrigger event will be generated.
This situation is illustrated in Figure 57 for rising edge triggering.
For more information about the Frame Start Overtrigger event, see Section 7.17 on page 314.
For more information about the camera’s ExposureTime parameter, see Section 6.5 on page 139.
Trigger Width Exposure Mode (acA640-90, acA640-120, acA1300-30, and
acA1600-20)
When trigger width exposure mode is selected, the length of the exposure for each frame
acquisition will be directly controlled by the ExFSTrig signal. If the camera is set for rising edge
triggering, the exposure time begins when the ExFSTrig signal rises and continues until the
ExFSTrig signal falls. If the camera is set for falling edge triggering, the exposure time begins when
the ExFSTrig signal falls and continues until the ExFSTrig signal rises. Figure 58 illustrates trigger
width exposure with the camera set for rising edge triggering.
Trigger width exposure is especially useful, if you intend to vary the length of the exposure time for
each captured frame.
To avoid overtriggering, use of the Frame Trigger Wait signal is strongly recommended. To use the
Frame Trigger Wait signal, you must set the ExposureOverlapTimeMax parameter. Its parameter
setting is used to operate the Frame Trigger Wait signal.
You should set the ExposureOverlapTimeMax parameter value to represent the shortest exposure
time you intend to use. For example, assume that you will be using trigger width exposure mode
This rise in the trigger signal will be
ignored, and a Frame Start Overtrigger
event will be generated
Exposure
(duration determined by the
ExposureTime parameter)
ExFSTrig Signal
Fig. 57: Overtriggering with Timed Exposure
ExFSTrig Signal Period
ExFSTrig Signal
Exposure
Fig. 58: Trigger Width Exposure with Rising Edge Triggering
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