11-6
IM WT3001E-51EN
Explanation
A display example is shown below. The vertical axis is in logarithmic scale. The words
<log Scale> is displayed to the right of the upper limit of the power spectrum.
Indicator that signify the presence
of data with negative values
Label of the displayed power
spectrum and the upper limit
Label of the displayed power
spectrum and the lower limit
<log Scale>
Frequency at the left end of
the screen of the displayed
power spectrum
Frequency at the right end of
the screen of the displayed
power spectrum
Number of data points
displayed in the range from
the left to the right end of the
screen
When “P-P” is displayed, the
power spectrum is displayed
using P-P compression
•
•
You can select the display format of the FFT data (power spectrum waveform) from the
list below.
• Displaying the Power Spectrum Waveform on the Entire Screen.
If you select FFT, the power spectrum waveform is displayed on the entire screen.
• Displaying the Power Spectrum Waveform by Dividing the Screen into
Halves (Split Screen)
• Numeric+FFT
The numeric data and power spectrum waveform are displayed separately in the
top and bottom windows.
• Wave+FFT
The waveform and power spectrum waveform are displayed separately in the top
and bottom windows.
For waveform display settings, see the User’s Manual IM WT3001E-01EN.
The measurement period of the waveform data and that of the FFT may not be
synchronized.
Note
The display update interval in FFT mode is the data update interval + computing time. The
computing time is approximately 10 s when the number of computed points (see section 11.4)
is 200 k. Therefore, it may take more than 10 s for the power spectrum to be displayed when
the FFT mode is enabled.
11.3 Setting the FFT Mode
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