This machine has 3 rotating assembles that run at 13.6 Hz, 17 Hz and 19.7 Hz. I am seeing a very strong 3.4 Hz signal which translates into a very large displacement. I can't figure out the source. It only exists when the machine is running other nearby operations don't contribute. The closest thing I found is a bearing FTF at 5.5 Hz.
I'm at a loss, any ideas?
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