ISG Allegro LightWise USB 3.0 Technical Manual Version 1.3.1
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External Trigger Timing
The time from the external trigger firing to the start of shutter is shown below:
1. Trigger Pulse
2. Propagation Delay
3. Exposure Time
4. Sensor Readout
5. Data Transfer
Figure 7.4: External trigger timing characteristics
Asynchronous Software Triggering
Shutter integration can be initiated by a software trigger by setting the Trigger Source to Software in the
GenICam features.
The time from a software trigger initiation to the start of shutter is shown below:
1. Software Trigger
2. Trigger Latency
3. Exposure Time
4. Sensor Readout
5. Data Transfer
Figure 7.6: Software trigger timing
The time from when the software trigger is written on the camera to when the start of integration occurs can
only be approximated. We then add the trigger latency (time from the trigger pulse to the start of integration) to
this.
This timing is solely from the camera perspective. It is virtually impossible to predict timing
from the user perspective due to latencies in the processing of commands on the host PC
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