acquisition with USB-6259

[AlexAG]

Hello everybody,

I use the example here with NI USB-6259 BNC.
It has intermal clock working at 80MHz.

1)Do I understand that right and it should provide a time accuracy up to 12.5ps?

I want to use external digital signal at 500kHz to trigger acquisition into 2 analig channels (voltage).

Channel 1 should sample with a delay after trigger, adjustable within 0.5us-1.5us.

Channel 2 should sample with a different delay after trigger, adjustable within 1.5-2us.

2) Is that doable with  NI USB-6259 and standart DAQmx functions?

3) Can someone suggest a link to an example?

Thank you in advance,

Alex 

[JK1]

You are trying to acheive a triggered acquisition with strict timing constraints.

It can be acheived by Daqmx

Have a look into : Cont Acq Sample-Timed Loop-Analog Start.vi in the examples shipping with LabVIEW and post back for queries.

[AlexAG]

Dear JK1,

I have tried the example and can not get it running. Error msg attached.

What I do:

1.In this example sampe clock rate is 1kHz. I leave it unchanged just to try, but I would like to go up to 1MHz 🙂

2. I connect trigger voltage (0-5V, 250kHz)  to  PFI0 and  APFI0 on  NI-USB6259

3. I connect sync 0-1V 250kHz signal to ai0

4. I make corresponding changes to channels in the example and try different trigger and timing parameters.

Nothing helps. What do I do wrong?

thanks