Plotting spectrum in Signal Analyzer app

Hi!

I am trying to plot the FFT of the captured oscillation data (light emitted from led bulb) using the Signal Analyzer app. Most frequencies are supposed to stand out from a frequency of 0 to 500Hz, but in this range the Signal Analyzer only plots a curve. How can I fix this?

Sampling rate: 1 MHz

0 to 500 Hz is just a curve

0 to 500 kHz looks ok

[Maadhav Akula]

Did you try modifying the sampling rate?

[Matic Markovic]

Yes, I lowered it to 25 kHz and it works. Thank you.