9-13
IM 701450-01E
9
Waveform Computation
Explanation
This section describes the procedures for setting the power spectrum computation (FFT)
in normal computation mode. If the user-defined computation option is installed, you
must first enter normal computation mode as described in section 9.1. For a description
of the setup procedure of user-defined computation, see section 9.9.
Note
An asterisk is displayed at the upper left corner of the screen while power spectrum
computation is in progress.
Turning ON/OFF the Computed Waveform Display and Computed Waveform Label
See section 9.1.
Operator
Select the power spectrum computation operator PS as the operator of Math1 and
Math2. The power spectrum of the waveform to be computed can be determined by
taking the FFT (Fast Fourier Transform).
Waveform to Be Computed
The waveforms on which computation can be performed are as follows:
Computation Name Source
Math1 One channel from CH1 to CH4
Math2 One channel from CH1 to CH4 and Math1
• On the menu, CH1 to CH4 may be indicated as C1 to C4 and Math1 as M1.
• To perform computation on CH5 to CH8 on the DL7480, the optional user-defined
computation function is required.
Scaling
The operation is the same as for addition, subtraction, and multiplication. See section
9.2.
Unit of Computed Waveforms
The operation is the same as for addition, subtraction, and multiplication. See section
9.2.
Computation Start Point
You can set the point where power spectrum computation is to start. The selectable
range is ±5 divisions, and the resolution is 10 divisions÷the display record length. For a
description of the display record length, see appendix 1.
Number of Computed Points
You can select 1 kW or 10 kW.
9.6 Performing Power Spectrum Computation (FFT)
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