labVIEW does not correctly read the data

I'm new to LabVIEW (use it for a subject in College), but I coded a short program which counts the fronts and edges of a signal (to be used with the addition of a quadrature encoder).

I tested it at low frequency using the block to simulate Signal and it works fine, but as soon as I have the pump up to anything above 4 Hz, it starts to play up (including a positive benefit as a negative benefit). 10 Hz, it is not the edges at all. Same thing with the encoder - when turning very slowly the counties to register very well, but even a moderate speed and it will start missing.

Don't know what the issue is. The code is pretty simple, so I don't know how this would have caused the problem. Here's a copy of my counter block (the entrance of true/false indicates whether to count the upwards or downwards).

Are adjust you the length of your signals simulated when you vary the frequency?

Your Subvi seems to be just looking for a transition in a waveform.

Your simulated signal Express VI is set up for the sampling frequency of 1000 Hz and 100 samples.  If the outer loop iterates at 10 Hz.  If your frequency of 5 Hz, then you will have 1 transition in the waveform section and you will be able to detect it.  You go higher in frequency, then you could have multiple transitions in your waveform, but the Subvi seeks only to the first, and he might not even have this one.  Remember when I said that you need to run your loop two times faster than the incoming wave?  Well now you see that the ratio of 2:1.

Adjust you the length of your simulated signals that you set the frequency so that you don't get multiple transitions on the waveform that you generate each iteration of the loop.

Tags: NI Software

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