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FFT analysing in log does not look like the FFT in wiki

Hello,

This is my log: https://drive.google.com/file/d/1-ywN02faqGy-eojEAYSV9jMKr8v5WIwB/view?usp=sharing
I am trying plot some information (following this wiki https://ardupilot.org/copter/docs/common-imu-fft.html) FTN1.BwAvg, FTN2[N].PkX, FTN2[N].PkY, FTN2[N].PkZ… but they are nothing but the flat line like this, except the FTN1.PkAvg

Could anyone please have a look and let me know if I did something wrong?
Thanks.

That’s really strange. Looks like you have done everything right. Maybe a logging issue? Check your bitmask and card speed. I also note a couple parameters listed twice which also seems really strange.

This is my LOG_ anf FFT_ parameters:

image

pardon me, what do you mean by “card speed”, It is new to me.
Thanks.

How fast your sdcard is

My test tool said around 8Mb/s - 10Mb/s (Read by cheap PC SD card reader). This is the original SD card coming with Cube Orange.

Servers by jDrones