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10-10
IM 701210-06E
Damping Rate, Force1, Force 2 (When Window Is Set to Exponential)
Damping rate:
Sets the weight of the last data point as a damping rate when taking the
weight of the first data point of the FFT computation to be 100% (= 1). Set the value in
the range of 1 to 100% (1% resolution). If the damping rate is set to 100%, the window
is equivalent to a rectangular window. The setting applies to both the input signal and
output (response).
Force1: Sets the area over which computation performed in terms of a percentage from
the first FFT point when taking the number of FFT points to be 100%. Set the
area in the range of 1 to 100% (1% resolution). If the area is set to 100%, the
window is equivalent to a rectangular window. The data outside the area is
computed as an average value of the area. The setting applies to the input
signal (first parameter) of the one-input FFT or two-input FFT.
Force2: The setting applies to the output (response) signal (second parameter) of the
two-input FFT. The setting is the same as Force1.
Number of FFT points
Damping
rate(%)
Force(%)
100%
W
eight
0
1
100%
Displaying the Overall Value (Only When Measure Is Set to ON)
If the channels (Math1 to Math8) on which power spectrum computation (PS or PSD*) is
selected are in the middle of the automated measurement of waveform parameters
(MEASURE: ON) and Rms is ON, the screen shows "Rms = overall value."
For details on the automated measurement of waveform parameters, see section 11.6.
For details on the overall value, see page App-19.
*
PSD is available only on models with the user-defined computation option (see section 10.5).
Note
If Window is set to Exponential, the overall value is not displayed.
Linear Scaling
When performing computation on a channel that has linear scaling set, the computation
is performed on the scaled value.
Notes When Displaying Power Spectrums
• The power spectrum cannot be computed, if the displayed record length is less than
number of computation points (Point).
• The number of computed points, time window, Start Point, and End Point are common
to all computation channels.
• You cannot expand the FFT waveforms horizontally that would cause the number of
points to be 50 or less. In such case, cursor measurement is not possible.
Notes When Performing Computation
• Computation is not performed again when you change Start Point or End Point while
computation is stopped. Be sure to press the Exec soft key to perform the
computation again. Otherwise, the waveform will not be displayed correctly when the
screen is redrawn.
• Normally, computation is performed on the sampled data stored in the acquisition
memory. However, for waveforms that have been acquired in envelope mode,
computation is performed on the maximum/minimum values per acquisition interval.
Note
While computation is in execution,
is displayed at the upper left corner of the screen.
10.3 Displaying the Power Spectrum