02-25-2016 03:40 PM
Hi all,
I am currently working on acquiring a 40kHz frequency through A/AI0 channel of the myRio board. With LabVIEW, I am able to acquire half of the waveform. Only the positive side of the waveform is shown for some reason. I was wondering if there is a setting in LabVIEW to change this problem or in myRio. I should be getting a -1V to +1V peak-to-peak waveform. Instead, I am getting only the waveform from 0 to +1V and it is clipped at 0.
Thank you for your help!
02-25-2016 03:52 PM
Hi pier2593,
That is expected behavior, because the AI inputs on the MXP A Connector is uni-polar. This is documented in the specifications for your device (Table 1 on page 5 of the link below)
http://www.ni.com/pdf/manuals/376047a.pdf
Here is a screenshot for convenience:
In summary: The channel you selected can only measure 0-5V.
If you need to measure a -1V to 1V signal, you will need to use the AI0/AI1 on the MSP (Connector C) on the myRIO. These two AI inputs support +-10V.
I hope this helps and good luck!
Regards,
Nathan P.
02-25-2016 05:05 PM
How would you go about using the +/- differential analog input channels? For the moment, I am simply sending a 40kHz signal to the analog input C/AI0+ and C/AI0-. Then I am trying to get both side of the analog signal without any good results.
02-26-2016 03:37 PM
you will need to be more specific. I don't know what "without any good results" mean. If you can provide screenshots and examples, that would be ideal.