Basler racer User Manual

AW00118508000 Acquisition Control
Basler racer Camera Link 67
Trigger Width Exposure Mode
When trigger width exposure mode is selected, the length of the exposure for each line acquisition
will be directly controlled by the ExLSTrig signal. If the camera is set for rising edge triggering, the
exposure time begins when the ExLSTrig signal rises and continues until the ExLSTrig signal falls.
If the camera is set for falling edge triggering, the exposure time begins when the ExLSTrig signal
falls and continues until the ExLSTrig signal rises.
Trigger width exposure is especially useful if you intend to vary the length of the exposure time for
each captured line.
The minimum allowed exposure time for each acquired line is as shown in Table 12 and there is no
limit on the maximum exposure time. Keep in mind, however, that using a very long exposure time
can lead to significant degradation of the image quality.
Fig. 20 illustrates trigger width exposure with the camera set for rising edge triggering.
When you use the trigger width exposure mode and want to monitor the Line Trigger Wait signal to
avoid overtriggering you must also set an ExposureOverlapTimeMaxAbs value. This value allows
the Line Trigger Wait signal to indicate when the camera becomes ready to receive a hardware line
start trigger.
For more information about the Line Start Trigger Wait (ExLSTrig Wait) signal, see Section 6.3.3 on
page 82.
raL2048-
80km
raL4096-
80km
raL6144-
80km
raL8192-
80km
raL12288-
66km
Min 2.0 µs 2.0 µs 2.0 µs 2.0 µs 2.0 µs
Table 12: Minimum Allowed Exposure Times
If you are using a GenICam compliant tool such as the Basler pylon Viewer and
you attempt to set the exposure time to exactly the minimum allowed or to exactly
the maximum allowed, you will see unusual error codes. This is an artifact of a
rounding error in the GenICam interface architecture. As a work around, you could
set the exposure time slightly above the minimum or below the maximum. Values
between the minimum and the maximum are not affected by the problem.
The joint use of the Line Trigger Wait signal and the
ExposureOverlapTimeMaxAbs setting is particularly useful when overlapping
exposure with sensor readout.
For more information, see Section 6.2 on page 71 and Section 6.3.3 on page 82.
ExLSTrig Signal Period
ExLSTrig Signal
Exposure
Fig. 20: Trigger Width Exposure with RisingEdge Triggering

Basler racer Specifications

General

Brand	Basler
Model	racer
Category	Digital Camera
Language	English