Synchronous acquisitions with two PXI-5122

[janex]

Hello,

I have two NI PXI-5122 in a PXI chassis. I need to use the total of 4 channel in 2 modules like a 4 channel digitizer.
I need synchronous acquisitions. I want to use a single trigger coming from an external function generator.

I'm new to PXI and LabVIEW, I read something about TClk synchronization, Star trigger, PXI trigger lines,...  and I am a little confused..
I think that I need to synchronize the clock of the two PXI-5122 and share an external trigger...which is the best method to do this?

And just for curiosity...if the cards were PXIexpress could I have better performance in terms of synchronization?

Thank you very much,

Best Regards

[DFGray]

The 5122 uses the TClk API to synchronize multiple devices.  Using PXIe vs PXI will not give better synchronization, since the synchronization occurs over the dedicated signal lines that both types of chassis share.  Search in the LabVIEW example finder for "TClk" and you will get several examples, four of which are for NI-SCOPE.  niScope EX Multi-Device Generic Sync (TClk).vi is probably the one you should look at first, since it does exaclty what you are asking for.

[Tatjana Daudrich]

Dear janex,

I found a Dokument in a Develeper Zone, which could help you.

National Instruments T-Clock Technology for Timing and Synchronization of Modular Instruments

http://zone.ni.com/devzone/cda/tut/p/id/3675

Let me know, when it helped you or when you need more support.

Best regards,

Tatjana

[janex]

Dear Tatjana and DFGray,  

thank you for the very usefull informations!

The National Instruments T-Clock Technology for Timing and Synchronization of Modular Instruments

is very well written and helps a lot.

I'll try to experiment with LabVIEW TClk examples...and then I have also found

"NI-TCLK Synchronize AWG and High-Speed Digitizer in C" that is perfect for my requirements.

Best Regards

[Tatjana Daudrich]

Dear janex,

you are welcome!

Thank you for your answer.

Wish you a great day!

Best wishes,

Tatjana