Internally Routing an Analog Out signal

[klynch08]

Hey everyone,

I am using an M-Series PCIe-6251 DAQ card. I am using it to send an analog signal to a speaker, and trigger a camera at the same particular frequency. Simply triggering off of the sample clock makes small errors and results in drift. I am wondering then if there is a way an analog out signal can be routed internally, so I can use it for an analog edge trigger.

Thanks!!!

[NI-Bongo]

Hi klynch08,

You cannot route these signals internally because the analog trigger circuitry is outside of the signal routing circuitry, but you could use an external connection from the analog output to an analog input or APFI line to use for the camera trigger task.

Of course, you are not really synchronizing the start of the AO and camera signal anymore as the AO task would need to start first to trigger the camera trigger.  You could use the level of the AO signal to match it to the phase you want in the signal.

In your current application, do you ensure that both tasks are starting simultaneously by putting the Start Task VIs inside a single frame of a Sequence Structure?  Also, do you share the sample clock between both tasks?

Advanced Analog Triggering and Snychronization Techniques
http://zone.ni.com/devzone/cda/tut/p/id/2989