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11-15
IM WT3001E-51EN
FFT (Option)
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Index
Explanation
• Display Type of the Power Spectrum
Select either of the two types below.
• Line: The FFT data is connected with lines. The display is a line graph.
• Bar: The FFT data is displayed on a bar graph.
• Display of Data with Negative Values
Data whose value is negative is displayed as follows:
• Line
The data is not displayed. If there is data with negative values, an exclamation
point is displayed at the left of the screen To display the negative data, change the
display type of the power spectrum to Bar.
• Bar
The absolute value of the negative data is displayed with a red bar graph. For
example, if the 0-Hz (DC) component is negative, it is displayed as shown below.
However, if the absolute value of the data is small with respect to the Y-axis scale,
it may not appear on the screen.
Indicator that signify
the presence of data
with negative values
When the power spectrum display type is set to Line
Displays data with negative
values with a red bar graph
When the power spectrum display type is set to Bar
11.7 Selecting the Display Type of the Power Spectrum