Adjusting trigger output from OptiHub

[msb]

Hello,

I am using Motive 1.7.5 on a 64bit system. I have 3 Flex13 cameras and the OptiHub 2. I'll be upgrading to Motive 1.9.0. soon.

I would like my OptiHub to send an output trigger each time the cameras capture an image, but only while recording a take. In the Synchronisation pane I use a "Custom Synchronisation", I set the Sync Mode to "OptiSync", and the Source to "Internal". Since I want triggers only while recording, and each time the cameras expose, my only option is to choose "Recording Pulse" in the External Sync Output. However, the device I am syncing to (which receives the triggers from the OptiHub) will only recognise a trigger if it has a duration of longer than a certain time (I am not yet sure what this duration is exactly, but I expect it to be around 10 - 15 ms), but the triggers from the OptiHub are as long as the camera exposure time (usually around 4 - 8 ms, I think), which is too short. So, my question is, is it possible to specify the duration of the output trigger from the OptiHub?

Obviously I realise that one should be careful in specifying the length of the output trigger to ensure it is not longer than the time between subsequent camera exposures, or the triggers will overlap each other.

Many thanks.

[steven.andrews]

Hi msb,

Thank you for reaching out to the community regarding your question, and for providing such a clear explanation of what you have encountered.

Unfortunately, you cannot specify the duration of the sync pulses since they must keep up with the frame rate of the cameras.

Technically, you can play with lowering the frame rate and increasing the exposure settings, on the cameras, to see if the exposure duration can be extended long enough to trigger your device. Lowering LED intensity also allows for increase in the exposure.
You would want to be careful not to adjust settings to the point that it is affecting your data quality, however.

I hope this information helps with your question. If you require any further assistance, please feel free to reach out to us at help.naturalpoint.com

Best,
Steven
--
Steven Andrews
OptiTrack | Customer Support Engineer