Continuous acquisition and two digitizers synchronization

[salomiva]

Hi!

I am using two high speed digitizers NI PXI 5124. I am running a continuous acquisition as in the attached example. I have two questions:

1) Is it possible to realize the continuous acquisition using some other trigger source instead of software trigger?

2) Depending on the answer on the first question - how to synchronize the two digitizers? In the attached example the digitizers have the same clock source and they receive the same clock synchronization pulse so the sampling frequencies are the same, but there is a random phase shift every time I start the acquisition.

Thank you!

Iva

[stockson]

Dear Iva,

if you are using just a software trigger, your measurements will always have a phase shift. They are using the same sample clock, but start at different times.

Did you have a look at the examples available in LabVIEW? If you go to Help>>Find Examples you will see a few projects that can be helpful:

BR,

[salomiva]

Hello, Mateusz!

I have been looking at these examples but I still don’t know how to run a continuous acquisition without a software trigger.

In the exapmle niScope EX Multi-Device Configured Acquisition (TClk).vi the acquisition resets in every loop (although the digitizers are synchronized), as I understood.

Iva

[stockson]

Hi,

what do you mean by saying, that it resets?

In the niScope EX MultiDevice Generic Sync (TClk) example you can see a simple implementation of synchronization - the only thing you need to do, is to modify it for continuous acquisition.

BR,

[salomiva · Accepted solution]

Hello, Mateusz!

I did just apply the idea from the examples, along with the ideas from here, and here is solution that works.

Thank you!

Iva