frequency of the FFT is not compatible with matlab

Hi all

Please find .jpg in the attachment. The signal is generated by a signal generator and collected by datashuttle/3000. Then I use the "FFT module" and "statistical value" to find the position max (frequency). I also downloaded the data and processed by matlab FFT function.  What I find, is that the value of the frequency of dasylab is always slightly less than matlab. For example, when the signal generator gives 10 Hz, the dasylab indicate 9,77 Hz and matlab gives 9.99 Hz I used matlab for years, so I have confidence in it. There must be something wrong with my program or dasylab.  First I have is because of the resolution, so I changed the "statistical values - mode - based block and tick (not quite sure about this) parent block and a value for every 240 blocks, which is also for the sampling of matlab."  Unfortunately, there is no change at all. Can anyone help?

Thank you very much

Alan

What is your size of rate and sample block DASYLab?

Try to make the block size an even number, for example, if you sample at 1000 Hz, made the size of the block 500 or 1000.

What is the equivalent block Matlab? The amount of data is used for the calculations.

You can also use the module block average average more than 250 blocks and then use the module of statistical values to calculate the maximum Position.

Tags: NI Products

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