Math Waveforms
6
Keysight InfiniiVision 1200 X-Series and EDUX1052A/G Oscilloscopes User's Guide
71
The horizontal axis of FFT math functions is frequency (Hertz). For the FFT
(Magnitude) math function, the vertical axis is in decibels or V RMS. For the FFT
(Phase) math function, the vertical axis is in degrees or radians.
Use the FFT (Magnitude) function to find crosstalk problems, to find distortion
problems in analog waveforms caused by amplifier non-linearity, or for adjusting
analog filters.
To display a FFT waveform:
1
Press the
[Math]
key, press the
Function
softkey and select
f(t)
, press the
Operator
softkey and select
FFT (Magnitude)
or
FFT (Phase)
.
•
More
— displays the FFT settings menu.
•
Auto Setup
— sets the frequency Span and Center to values
that will cause the entire available spectrum to be
displayed. The maximum available frequency is half the
FFT sample rate, which is a function of the time per
division setting. The FFT resolution is the quotient of the
sampling rate and the number of FFT points (f
S
/N). The
current FFT Resolution is displayed.
