Trigger Input Configuration

The trigger input of The Imaging Source USB and FireWire CCD cameras utilizes opto-coupling technology. This design allows the system to accept positive trigger pulses with any amplitude between 3.3 V and 12 V. For applications requiring higher voltage levels, users must ensure that the current remains within the range of 3 mA to 12 mA.

Exposure & Image Readout Timing Modes

The cameras are equipped with two distinct operational modes:

Free Running Mode

In free running mode, the camera generates a continuous stream of images at up to 60 frames per second (fps), depending on the selected resolution. For data reduction purposes, frame rates can be adjusted downward to 30 fps, 15 fps, 7.5 fps or 3.75 fps.

The exposure duration is software-controllable between 100 microseconds (μs) and 30 seconds (s). It’s important to note that while the camera’s internal clock generator dictates the actual moment of exposure, this timing parameter can be measured using the strobe output feature. This mode derives its name from the autonomous operation cycle.

Trigger Mode

The trigger input enables precise control over the start time of an exposure sequence. Exposure begins 4.8 microseconds (μs) after receiving a trigger pulse.

Exposure duration remains adjustable via software from 100 μs up to 30 seconds (s). The image readout period corresponds inversely with the frame rate setting. Following completion of the image transfer process, the system becomes available for accepting subsequent trigger pulses at any time.

To be continued…

Last Updated: 2025-09-05 02:12:46