Possible bug in sv_Harmonic distortion and Noise.vi

Hello

I ran into what seems to be a bug in distortion and Noise.vi sv_Harmonic

I call this VI into a higher level VI which is part of the box sound & Vibration tool (SVT SNR without harmonic (time) (1ch) .vi)

What is happening is that I sometimes get error 0xFFFFB1A3 (-20061):

Error-20061 occurred at NI_MABase.lvlibine Waveform.vi:22 > NI_MABase.lvlib:ma_Trap Fgen parameter Errors.vi:1
frequency must be<= sampling="">

Possible reasons:

Analysis: The selection is not valid.

This error is actually produced in distortion and Noise.vi sv_Harmonic by one of his subVIs (your unique information (complex) .vi svc_Extract) although I'm not able to activate debugging for this VI so I can't dig deeper.

What seems to be the case, it is for certain fundamental frequencies that result in higher order harmonic which is located very close to Fs/2, you get the error.  I have attached a waveform and a simple VI that generates the error.  My debugging, it seems that the error occurred when the code attempts to extract the harmonic at 5119,53 Hz.  FS/2 is 5120Hz, so it must be valid, but generates an error.

Thank you

-mat

Hey Matt,

I spoke with R & D and the source of this problem is we're detects peaking at exactly the Nyquist frequency for the 127th harmonic, while it should work, we get the false error. To work around the problem, you can specify the frequency range of 0-126 harmonics as seen in the image below.  Have one less harmonic should not be a big problem as the harmonic 127th is anyway in the noise.  R & D is now aware of the issue and look forward to it.   Thank you!

Tags: NI Software

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