Combustion Can Band of Low/Med/High Peak Amplitude Function

Hi
The machine we used is GE 9FA there is 18 combustion can and combustion system is DLN2.0+. Each combustion have Low/Med/High peak amplitude of frequency.
I want to know the function of combustion can band frequency at different amplitude and how it is related to Exhaust Thermocouple as found Mark 6e logic.
Regards
Abby
 

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