How can I write file to a discrete time step?

I am writing some variables to output to a binary file in time real (PosX, Posy, elapsed time) with a while loop (see blockdiag.png).  I use the time achieved by LabVIEW with a clock from external devices to interpolate the position values, before ask you, I do not have access to the external clock interpolation is so needed after the data were collected.  Currently, the while loop is relentlessly and as fast he let the CPU. After I'm done collecting my data, I traced upward time spent in MATLAB and noticed a very strange, negative time behavior (see clocks.png). Black data here is my clock to external devices and the Red data represents the time elapsed, written by LabVIEW.  There are two instances of the vector that indicate a big negative step in time.  This is not always the case and seems to occur somewhat spontaneously in the vector of elapsed time.

Issues related to the:

(1) anyone seen this behavior before?

(2) would be to put a Wait.vi in the while loop help? (I thought it would be at least to regularize the time step).

(3) Please help.

Well thank you, please do not judge my LabVIEW code (I'm sure there are better ways to do it, but it works, and that's how I want).

Adam


Tags: NI Software

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