PIC search returns an incorrect value

I use advanced research VI for the tendency of a power spectrum amplitudes. Advanced VI research is not showing the correct amplitudes.  They are off by a little bit every time.  I watched the berries from the exit of the power spectrum, and I checked the cutting-edge research is get good input data but out something unexpected. I have advanced research for: 1) Single Max Peak, threshold = 0, start = 57.8 Hz, Stop = 59 Hz and 2) Single Max Peak, threshold = 0, Start = 61 Hz, Stop = 62.2 Hz. Or a poster of the correct value.  I'll post my code, but the file I open is a .dat so I can't post that.

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Research of spectrum VI made an adjustment to identify the peaks of the curve. Advanced search algorithm is described in the help:

Details of the spectrum SVFA cutting-edge research

The Spectrum Peak Search VI SVFA finds all of the peaks in the spectrum and makes an estimate amplitude/frequency or amplitude/order on each individual pic. The VI works on the ghosts of greatness and power.

Usually, the spectrum is calculated based on an input with windows signal. The closed shape of any COS, such as Hanning, Hamming, Blackman-Harris window and so on, is known. The presence of three dominant bins indicates a local maximum on power spectrum. So, when the Spectrum Peak Search VI SVFA locates the three dominant bins, a curve maps algorithm the shape of window on three bins and believes that the true frequency and amplitude of this particular tone. The following illustration of the diagrams of the concept of the algorithm.

==================

If you want the local maxima of the spectra, you can use the following code:

Tags: NI Software

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