Why is FFT not available for Calculated Channel in Flexlogger

Updated Jun 16, 2026

Reported In

Hardware

  • NI-9234
  • cDAQ-9174

Software

  • FlexLogger

Driver

  • NI-DAQmx 18.6

Issue Details

I acquire vibration signals using NI 9234 with FlexLogger. I would like to perform Fast Fourier Transform(FFT) for calculated channels but I find no option to do so.
 

Solution

Formulas for calculated channels only contain standard math operators, functions, and constants. Refer to the Calculation Formula Options to check all formulas you are able to use.

For ordinary I/O channels, you can easily perform FFT, just use the FFT Graph in the Screen section.

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