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10-25

IM DLM6054-01EN

Analysis and Searching

Index

App

Number of FFT Points (FFT Point)

You can select one of the following options.

2.5k, 6.25k, 12.5k, 25k, 62.5k, 125k, or 250k

Note

Relationship between the Number of FFT Points and the Number of Displayed Points (Display Record

Length)

Depending on the number of displayed points in the window that you select using the analysis range (Time

Range) setting, the actual number of FFT points may be different from the number of FFT points that you

selected.

If the number of FFT points is less than the number of displayed points, the displayed points are sampled to

match the number of FFT points. The FFT may not cover the entire display range.

If the number of FFT points is greater than the number of displayed points, the number of FFT points is

adjusted to an appropriate number that is less than or equal to the number of displayed points.

Analysis Range (Time Range)

Select the analysis range from the options listed below.

• Main: The range of the entire main window

• Zoom1: The range of the entire Zoom1 window

• Zoom2: The range of the entire Zoom2 window

Scale Value (Display Setup)

Set the vertical and horizontal scale values.

Displaying the Source Waveform (VT Display)

Select whether or not to display the FFT source waveform.

• ON: The source waveform is displayed.

• OFF: The source waveform is not displayed.

Reference Position (Ref Position)

Set the reference position on the vertical axis to a value within ±4.00 divisions.

Vertical Scale (Vertical Scale)

You can select one of the following options.

• Auto: The vertical scale values are set automatically.

• Manual: Set the center (Ref Level) of the vertical axis and the value per division (Sensitivity).

Horizontal Scale (Horizontal Scale)

You can select one of the following options.

• Auto: The center point and span are set automatically.

• Center/Span: Set the center point and span manually.

• Left/Right: Set the left and right ends of the scale manually.

10.5 Performing FFT Analysis

YOKOGAWA DL6000 Series User Manual

Questions and Answers: