Hi all,
I use 2 NI-9512 modules for analog measurements in a cRIO9074 in FPGA mode.
Right now, I use the uncalibrated raw data from the module, and stream it in a FIFO to the host, where I calibrate using the LBS ans offset value, which I also take from the IO node. I did read the NI article on how to do the calibration, and I use the "binary to nominal"-VI.
However, I noticed, that some of the channels (AI1, AI2 and AI3) give the wrong voltage values with an error of around 90 mV. AI0 is precisely correct, which is why I doubt I did a mistake in the calibration process.
I notice, that when I use the calibrated fixed point data from the FPGA, there is no error!
First, I wonder why using the raw data gives me wrong values.
secondly, and my main question is how to stream the fixed point data in my code without losing synchronization:
The reason I used the raw data is that my FPGA codes reads some analog data and some counter data that needs to me sync! Obviously, the counter data are integers. I wanted to use the same FIFO to stream the data to make sure they are in sync, thats why I used the raw-type for the analog data - to have all integers.
Now, when I use 2 FIFOS, one with integers for the counter data, one with fixed point data to stream the calibrated analog values - can I be sure that they are in sync?
Thank you very much for any help.
Greeting,
Jack
