Basler acA2000-165, User Manual

Page: 147 / 272

AW00123402000 Image Acquisition Control
Basler ace USB 3.0 137
When the camera is set for the trigger width exposure mode, the rise of the Frame Trigger Wait
signal is based on the Exposure Overlap Time Max parameter setting and on when readout of the
current frame will end. This functionality is illustrated in Figure 66.
If you are operating the camera in the trigger width exposure mode, you can avoid overtriggering
the camera by always doing the following:

Setting the camera’s Exposure Overlap Time Max parameter so that it represents the smallest
exposure time you intend to use.

Making sure that your exposure time is always equal to or greater than the setting for the
Exposure Overlap Time Max parameter.

Monitoring the camera’s Frame Trigger Wait signal and only using the ExFSTrig signal to start
exposure when the Frame Trigger Wait signal is high.
You should set the Exposure Overlap Time Max parameter value to represent the shortest exposure
time you intend to use. For example, assume that you will be using trigger width exposure mode
and that you intend to use the ExFSTrig signal to vary the exposure time in a range from 3000 µs
to 5500 µs. In this case you would set the camera’s Exposure Overlap Time Max parameter to
3000 µs.
Frame Acquisition N
Exposure Readout
Time
Frame Trig
Wait Signal
Frame Acquisition N+1
Exposure
Frame Acquisition N+2
Exposure
ExFSTrig
Signal
Exp. Overlap Time
Max Setting
Exp. Overlap Time
Max Setting
The rise of the Frame Trigger
Wait signal is based on the end
of frame readout and on the
current Exposure Overlap Time
Max parameter setting
= Camera is in a "waiting for
frame start trigger" status
Fig. 66: Frame Trigger Wait Signal with the Trigger Width Exposure Mode
Sensor Readout
Sensor Readout