13.3 Setting FFT Analysis Conditions
221
13
Chapter 13 FFT Function
3
When [Parameter] setting contents are displayed
Set the parameter.
Move the cursor to the
[Parameter] column of the Analysis No.
to set.
4
Select the channel for analysis.
Move the cursor to the [Ch1] item.
Select which channel number to use.
5
Set the horizontal and vertical axes displaying the calcu-
lation results.
Move the cursor to the
[X Axis] or [Y Axis].
Set the contents of the calculation results to be displayed on
the horizontal and vertical axes.
(Selectable display contents vary by analysis mode.)
See: "Analysis Modes and X/Y Axis Display" ( p.222)
Y-axis display
X-axis display
Analyze Parameter Setting Contents
1/1 Octave,
1/3 Octave
Filter: Normal
nables the octave filter.
See: "Octave Filter Setting" (
p.222)
Filter: Sharp
Phase Spectrum
1ch FFT Calculates the phase of [Ch1].
2ch FFT Calculates the phase difference between [Ch1] and
[Ch2].
LPC (dencity)
Order :2 to 64 Larger numerical values make finer spectrum compo-
nents visible.
Lin-Mag Analysis results are displayed as amplitude values.
Log-Mag Analysis results are displayed as dB values.
The dB reference is 1 eu. (As a voltage example, 1 V is
0 dB.)
Lin-Real The real-number component of analysis results are dis-
played.
Lin-Imag The imaginary component of analysis results are dis-
played.
Linear Frequency-axis is displayed linearly.
Log Frequency-axis is displayed logarithmically.
This is convenient when the data of interest is at the lower end
of the frequency range, such as for sound and vibration.
Analysis channel setting
For any of the following analysis modes,
set both channels 1 and 2.
Transfer Function, Impulse Response,
Cross-correlation Function, Cross Power
Spectrum, Coherence Function, Phase
Spectrum (2ch FFT)
To analyze using external sampling
The horizontal axis ( x-axis) displays the
number of data points.
How do I copy settings to other calculation No.?
See: "8.9 Copying settings to other channels (calculation No.) (Copy function)" (
p.139)
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