Data Acquisition 2 analog in with 20KHz (myRIO)

[GerdW]

Hi L,

see this list to find the error explanation…

[LVelozo]

Hi GerdW,

First of all, I appreciated a lot your help. I understood my problem. I have used the Analog Input (N Samples) due to the rate of acquisition that I need (20KHz with 10,000 samples). But according to table below the myRIO 1900 using High Throughput have only one channel, so it is not possible to add two channel. I have tried to use Analog Input (1 sample) for two channels. It is working but I did not reach in the sample rate and samples that I need. I read some topics about to use FPGA analog input, but I am not familiar with kind of language, and I have heard that sample rate won’t be 20 KHz. Do you have any idea or example how to fix it?

https://www.ni.com/docs/en-US/bundle/labview-myrio-toolkit/page/myriohelp/myrio_one_sample_n_samples...

https://www.ni.com/docs/en-US/bundle/labview-myrio-toolkit/page/myriohelp/myrio_fpga_personalities.h...

Best Regards

LVelozo

[JÞB]

Reading through the device specifications for the 1900 you will see that the AI bandwidth is >300kHz and it supports 500kS/sec AGGREGATE sample rate.  So, for only 2 Channels you could easily reach 20kS/sec using the "Default" personality and an "n Sample n Ch" hardware timed acquisition.  The "High Throughput" personality is simply the wrong choice for your specific needs.