Reference Trigger

[Giulia]

I have read Data Acquisition and Signal Conditioning Manual and I have found that my goal is realizing a Reference Trigger. I have got a NI PXI 4472 device, good for Traditional DAQ, not good for DAQmx. The problem is that all the examples and exercise in the manual are suitable for DAQmx applications. Can you suggest me a Data Acquisition manual to solve my problem, or the correct example to look at in Traditional DAQ?

[Jack_A.]

Giulia -

You are correct. The NI-4472 is not supported in DAQmx 7.1 so you will have to use Traditional DAQ. There is a shipping example called Acquire N Scans Digital Trig.VI. If you open this VI and designate some pre trigger samples, your trigger is now a reference trigger instead of a start trigger since you will acquire data before the trigger arrives. This is the same for an analog trigger as well.

If you are using something other than LabVIEW, look ate one of the shipping example for Traditional DAQ which uses triggering and just specify your pre trigger samples. Hope this helps.

Jack
Application Engineer
National Instruments

[Giulia]

Thank you for attention. I have already tried to use the example you suggested. The problem is I need not only a reference trigger, but a continuous acquisition, too. I have read somewhere in the on-line user manuals that continuous acquisition is not suitable with reference trigger. Is it true? Do I really have no possibility of doing what I need and solve my problem with my PXI-4472? You can look at my other recently posted questions to get an idea of my problem. Thank you and hope to hear of you soon. Giulia