# Problem about Fourier analysis

**URL:** <https://forum.plexim.com/t/problem-about-fourier-analysis/874>\
**Category:** PLECS\
**Tags:** fourier\
**Created:** [October 10, 2020, 10:47pm UTC](https://forum.plexim.com/t/problem-about-fourier-analysis/874 "2020-10-10T22:47:59Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![htl842755](https://avatars.discourse-cdn.com/v4/letter/h/b3f665/32.png) [@htl842755](https://forum.plexim.com/u/htl842755)\
**Post date:** [October 10, 2020, 10:47pm UTC](https://forum.plexim.com/t/problem-about-fourier-analysis/874/1 "2020-10-10T22:47:59Z")

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I want to get the magnitude of harmonic at 720kHz, and the base frequency is set as 50 Hz. But it seems that the maximum number of Fourier coefficients(N) in the scope can be only set to 10 000 ?

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**Author:** ![Bryan\_Lieblick](https://dub1.discourse-cdn.com/flex006/user_avatar/forum.plexim.com/bryan_lieblick/32/10_2.png) [@Bryan\_Lieblick](https://forum.plexim.com/u/Bryan_Lieblick)\
**Post date:** [October 13, 2020, 1:33pm UTC](https://forum.plexim.com/t/problem-about-fourier-analysis/874/2 "2020-10-13T13:33:30Z")

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Potential workarounds include setting a higher base frequency (e.g. 100 Hz results in a spectra up to 1 MHz) or using the Fourier Transform block to analyze the specific frequencies of interest. You can also use a simulation script to export the data and analyze it in Octave/Matlab.