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App-22
IM 701210-06E
• Combined Form of Exponential Window and Force Window
The DL750/DL750P applies a window function that combines the exponential window
and force window for performing computations. The data outside the force window
area are computed as an average value of the area.
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0
20
40
60
80
100
Record length (%)
A constant damping rate is applied to the data
outside the area (80% to 100% of the record length).
Damping rate: 1%
Damping rate: 20%
Damping rate: 50%
Damping rate: 90%
When the force window area is set to 80% and the data outside the area is taken into account
Weight
• Application Example on the DL750/DL750P
0
20
Source data
Computed result by
the exponential
window
Computed result by
the exponential and
force windows
40
60
80
100
0
0.5
1
1.5
2
Record length (%)
The data outside the area (80% to 100% of the
record length) is computed using an average
value of the area at a constant damping rate.
When the damping rate is set to 20% and force 1 is set to 80%
Weight
Notes When Executing the FFT Computation
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.
Appendix 5 User-Defined Computation