13.9 FFT Analysis Modes
240
Waveform Example
Power Spectrum
Displays input signal power as the amplitude component.
Main uses:
• To inspect the peak frequency contents of a waveform
• To inspect the power level at each frequency
See: About the Functions"13.9.2 Analysis Mode Functions" ( p.254)
Axis Display Type Description
X axis
Linear Frequency is displayed with equal spacing
Log Frequency display of logarithm interval
Y axis
Lin-Mag
Analysis data is displayed linearly as squared values. Indicates the power com-
ponent.
Log-Mag(logarithm)
Analysis values are displayed as dB values. (0 dB reference value: 1eu
2
)*
* eu: engineering units that are currently set are the standard (e.g., when the unit settings is volts, 0 dB = 1 V
2
)
Normal display
X axis: Log
Y axis: Lin-Mag
Normal display
X axis: Log
Y axis: Log-Mag
If the cursor is displayed, the total harmonic distortion (THD), which sets the fun-
damental wave as the cursor position, is displayed. When 2 cursors appear, the
one with the low frequency becomes the fundamental. When results cannot be
obtained, [---%] is displayed.
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