Loop timing crio vs. roborio.

[wt200999]

The difference could be from quite a number of factors. The most obvious one would be the difference in the loop times. Another big factor is the difference in what is running in the background and how it is being scheduled.

You should expect jitter from using the "Wait Until Next ms Multiple", this is similar to the problem of using Thread.sleep() in Java. If you need more accurate timing you need to use a timed loop structure, which will also tell you if the loop runs too long and a couple of other useful things.

Along with the paper from 358 link, this paper from NI has some useful info on the wait functions in LabVIEW RT.