User Manual

3.10 FFT Analysis Modes
88
Waveform Example
Power Spectrum PSP
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 "3.10.2 Analysis Mode Functions" (⇒ p. 102)
Axis Display Type Description
X axis
Linear
Frequency is displayed with equal spacing
Display Range: DC to the top of the frequency range
Log
Frequency is displayed logarithmically
Display Range: 1/400
th
to 1/4000
th
(depending on the number of analysis
points) to the top of the frequency range
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