C–13
Using FFT
Error Messages One of these FFT-related error messages may be displayed at
the top of the screen.
Error Messages
Message Meaning
“Incompatible input record type”
FFT power average is defined only on a function
defined as FFT.
“Horizontal units don't match” FFT of a frequency-domain waveform is not available.
“FFT source data zero filled” If there are invalid data points in the source waveform
(at the beginning or at the end of the record), these are
replaced by zeros before FFT processing.
“FFT source data
over/underflow”
The source waveform data has been clipped in
amplitude, either in the acquisition — gain too high or
inappropriate offset — or in previous processing. The
resulting FFT contains harmonic components which
would not be present in the unclipped waveform. The
settings defining the acquisition or processing should be
changed to eliminate the over/underflow condition.
“Circular computation” A function definition is circular (i.e. the function is its
own source, indirectly via another function or
expansion). One of the definitions should be changed.
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