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scale and map

when analysing a signal which having noise after FFT,  I need measure noise field level base on some spectrum range.  When I add some conversion table(actually measured voltage being related to the magnetic field strengthen.)into this dynamic data which is after FFT,   I use VI: scale and map directly, But It does't work. Does anyone have good idea?

 

for example:

the conversion table is drawn from one curve of the below figure:

 

 

 

conversion figure.jpg

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You can use XY graph. Then, press Ctrl+H and point your cursor to XY graph to see how to plot data on it.

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