108 Keysight InfiniiVision 3000T X-Series Oscilloscopes User's Guide
5 Math Waveforms
See Also • “Units for Math Waveforms" on page 101
FFT Magnitude, FFT Phase
Using the Fast Fourier Transform (FFT), the FFT (Magnitude) math function
displays the magnitudes of the frequency content that makes up the source
waveform, and the FFT (Phase) math function shows the phase relationships of the
frequency content. The FFT takes the digitized time record of the specified source
and transforms it to the frequency domain.
The source of the FFT math functions can be analog input channels or a lower
math function.
The horizontal axis of FFT math functions is frequency (Hertz). For the FFT
(Magnitude) math function, the vertical axis is in decibels when Logarithmic
vertical units are selected or V RMS when Linear vertical units are selected. For
the FFT (Phase) math function, the vertical axis is in degrees or radians.
Figure 10 Integrate With Signal Offset
Integrate
with DC offset
correction
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