Basler raL2048-48gm User Manual Page 99

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AW00118302000 Acquisition Control
Basler racer GigE 89
Exposure Time Control with Line Start Trigger Mode On
When the Line Start Trigger Mode parameter is set to on, there are three modes available to control
the exposure time for each acquired line: trigger width control, timed control, and control off. You
can set the camera’s Exposure Mode parameter to select one of the exposure time control modes.
The modes are explained in detail below.
If you have the Line Start Trigger Source parameter set to Line 1, Line 2, or Line 3, any one of the
two exposure time control modes will work well. You should select the mode that is most appropriate
for your application.
If you have the Line Start Trigger Source parameter set to Shaft Encoder Module out, we
recommend that you select the timed control mode. The trigger width mode should not be used in
this case.
Trigger Width Exposure Time Control Mode
When the trigger width exposure time control mode is selected, the exposure time for each line
acquisition will be directly controlled by the source signal for the line start trigger. If the camera is
set for rising edge triggering, the exposure time begins when the signal rises and continues until the
signal falls. If the camera is set for falling edge triggering, the exposure time begins when the signal
falls and continues until the signal rises. Fig. 26 illustrates trigger width exposure with the camera
set for rising edge line start triggering.
Trigger width exposure is especially useful if you intend to vary the length of the exposure time for
each acquired line.
Fig. 26: Trigger Width Exposure with Rising Edge Line Start Triggering
In all cases, the exposure time for each line must be within the minimum and the
maximum stated in Table 10 on page 93. This is true regardless of the method
used to control exposure.
Source Signal Period
Source
Signal
Exposure
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