6 Camera Control for the pco.edge
12
pco.edge User Manual V1.03 © PCO AG, Germany
6.2 The “Timing” tab
Trigger Mode
[Auto Sequence] The camera will optimize the image recording depending
on the adjusted exposure time and the required readout time to achieve the
best possible frame rate (“free running”).
[Soft Trigger] Single images can be recorded with Camware control. A
single image can be acquired by pressing the "Single Trigger" button (7.2).
Other signals cannot influence this operating mode - for test purposes only.
[External Exp. Start] The image acquisition is triggered by an external
signal. It is also possible to force a software trigger for a test image with the
"Single Trigger" button.
In the [External Exp. Start] exposure control mode, single image
recording is started by the falling or rising edge of the voltage signal at
the BNC input #1 (6.6). The frame rate cannot be set, as the frame rate is
defined by the frequency of the external signal. However the predefined
exposure time and ROI settings affect the maximum possible frame rate.
The Busy Status signal at BNC #3 (6.6) will indicate if a new trigger is
accepted.
The maximum achievable frame rate in external trigger mode is
negligibly less (about 0.1%) than operating the camera in [Auto
Sequence] mode.
Note: If the trigger rate of the external signal is quite near the maximum
possible frame rate (difference < 1/1000), then it will be random, whether
or not a trigger is accepted!
If the trigger rate of the external signal is higher than the maximum
possible frame rate, then every second trigger pulse is ignored.
Therefore the actual frame rate drops to ½ of the external trigger rate. If
the trigger rate is increased further, then only every 3rd, every 4th etc.
trigger edge will be accepted.
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