Multiple DAQ synchronization

[bp28]

Hello all,

I am trying to acquire acoustic emission signals through NI USB 6361, vibration signals through NI USB 6210, and pressure signals through NI USB 6009 at different sampling frequencies. Is it possible to time synchronise these devices?

I found that USB-6009 and USB-6210 use internal clocks and do not support external clock inputs or direct synchronisation between devices, whereas USB-6361 can use an external reference clock for its timing operations.

I would be grateful for a clarification on this issue.

[Kevin_Price]

When multi-device sync matters, USB is an unfortunate choice.   There are probably some options available with enough careful screwdriver-and-physical-wire work, combined with the corresponding low-level DAQmx config work.   But I don't know your USB devices well enough to promise that for sure.

How many total AI channels of each type do you have?  If at all possible, I'd be inclined to suggest you try to capture them all with a single task on the 6361 at the highest sample rate, then do software resampling for the lower sample rate channels.  If too much I/O for that, I'd suspect that the 6210 is the next best device to add to the mix.

Basically, fewer USB devices == fewer hassles establishing and maintaining sync, with 1 device as the optimal goal.

-Kevin P

[ZYOng]

USB-6009 does not support signal routing.

For USB-6210, if you check the signal routing in NI MAX, you can route the signal from PFI to AI Sample Clock and Sample Clock Timebase.

For the programming, see Example for Synchronizing two DAQ devices Using LabVIEW with DAQmx

[bp28]

Thank you for the information.

[bp28]

Thanks a lot for the information. I am trying these options to find the best solution.