User Manual

3.10 FFT Analysis Modes
95
Waveform Example
Emphasizing only a Specific Portion (Highlighted Display) ____________
A specific portion of a phase spectrum can be emphasized and displayed.
See "3.4.7 Emphasizing Analysis Results (phase spectra only)" (⇒ p. 61)
Phase Spectrum PHA
Shows the phase characteristics of the input signal.
Main uses:
• To inspect the phase spectrum of channel 1. Displays the phase of a cosine waveform as a reference (0º).
• To inspect the phase difference between channels 1 and 2.
See About the Functions "3.10.2 Analysis Mode Functions" (⇒ p. 102)
1 Ch FFT: Displays the phase of the signal on channel 1. Displays the phase of a cosine waveform as a ref-
erence (0º). Unless the waveform is synchronous, phase values are unstable.
2 Ch FFT: Displays the phase difference between channels 1 and 2. Positive values indicate that the phase
of channel 2 is leading.
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 values are displayed linearly.
1chFFT
X axis: Log
Y axis: Lin-Mag
2chFFT
X axis: Log
Y axis: Log-Mag