Why labview programmers use 10.1 the default frequency instead of a same 10.0 Hz?

It was an issue that was raised during the lab class and no one has an answer for.  Any ideas?

I call it the wagon wheel effect.

In the old westerns, whenever a wagon with a Ferris wheel to rays rode by the camera, sometimes the wheel would look like it rolls slowly forward, sometimes slowly propagated backwards, sometimes it would look as if it was stopped.

It is a function of the frame rate of the camera over the period of the cycle of the spokes of the wheel.  If we spoke (or more) offers exactly the right distance between a frame of the movie and the next, it would look like the wheel had not moved at all.  If he moved a little further than the distance from rotation of we talked, it would look like it rolls slowly forward.  If the cart is a little slower, then it would move only less than the distance of a spoke and he would look like the wheel rolls backward.

Same thing with having a periodic waveform (every bump of the sine wave is a spoke of the wheel) and a number of acquisition of samples and data rate equal to a whole number of this period (essentially the frame rate of the camera.)  Wagon wheel always rolls forward.  The sine wave is still oscillating.  But according to the rate of acquisition compared to the wave sinusoidal frequency gives a different appearance to the appearance of this sine wave on the chart.

Experiment and give it a 9.9 Hz sinusoid, you will see that it seems to move backward.

So I think (and this is only a guess) is that whoever designed the express VI gave it a default value of 10.1 Hz to visually simulate on the graph of the sine wave motion.

It doesn't really matter what they chose by default as it is to you that the programmer LabVIEW to change this default setting (whether in the express VI or the wiring in a value) to something that makes sense for your application.

Tags: NI Software

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