04-27-2015 05:08 AM
Hi all,I am trying to acquire the analog voltage of a signal and I'm wondering how I can use the source input of the DAQmx Timing (Sample clock) VI to get a high sample rate considering that the maximum sampling rate of the NI-USRP 6351 is 1.25 MHz. In my application I need to have more samples/bit
I'm also wondering how (if possible) I can generate a differential signal using this DAQ. I know it is possible to acquire a differential signal but not sure if the generation can also be done.
Thanks a lot in advance
04-27-2015 08:53 AM
04-29-2015 07:08 AM
Hi Dennis_Knutson
Sorry, I meant USB instead of USRP.
It was purchased for another application
How could I do it with external circuitry? Could you give me some ideas or references in which I can read how to do it?
Thank you
04-29-2015 08:07 AM
04-29-2015 09:28 AM - edited 04-29-2015 09:29 AM
With regards to your sample rate question, the spec is only 1.25 MHz. In practice you might be able to go a little faster than this (even using the internal sample clock), though if you're looking for a significant increase in sample rate you'll need to select a different product that meets your specifications.
When the rate exceeds a certain threshold you will encounter an ADC conversion error (-200019), which happens if the sample clock edge occurs before the previous ADC conversion has completed. You'll have to experiment to find the absolute max rate, I don't know off the top of my head.
Best Regards,
04-29-2015 09:38 AM
Hi Dennis_Knutson and Dennis_Knutson,
Thanks for your responses.
I'd also like to know how I can generate a differential signal from the DAQ. Do you have any idea? Dennis_Knutson you suggested using external circuitry. Could you elaborate a little bit more your answer, please?
Thank you!
04-29-2015 10:22 AM