Hi
I'm seeing repeated values in my measurements and trying to determine the cause
I'm reading a single analog channel from an NI 9201 module. In order to remove noise I'm averaging several samples using the DC and RMS Measurements VI (shown in 'FPGA Code.png')
An example of repeated values is shown in 'Comparison of Signals.png' for both the original and averaged signal
The sample rate of the NI 9201 module for a single channel is 500 kS/s, which I have also verified by measuring the sample rate (the code for this is also shown in 'FPGA Code.png')
On the RT cRIO target I am recording these values in a timed loop running at 500us using the 1 MHz clock of the cRio
For the DC and RMS Measurements VI I have tried several options, for example:
- 500 us measurement time, sample rate 500 kS/s
- 450 us measurement time, sample rate 450 kS/s
- 400 us measurement time, sample rate 400 kS/s
- 300 us measurement time, sample rate 300 kS/s
All of them give measurements that have repeating values in varying degrees, for both the original and averaged signals
Any suggestions?