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10. 10Appendix - 10.4. FFT Analysis
132
1WMPD4004444
Transfer Function (Two Signal Analysis)
The transfer function indicates the frequency characteristics of the input and output of the transfer
system.
It is derived as the ratio of the cross power spectrum Gyx and input (reference) power spectrum Gxx.
Transfer function = Hyx = Gyx/ Gxx
Real number part
Lin-Rel
HRyx
Imaginary number part
Lin-Img
HIyx
Amplitude
Lin-Amp
�𝐻𝐻𝑅𝑅𝑅𝑅𝑅𝑅
2
+
𝐻𝐻𝐼𝐼𝑅𝑅𝑅𝑅
2
Logarithmic amplitude
Log-Amp
10 × log(HRyx
2
+ HIyx
2
)
Phase
Phase
tan
−1
(HIyx/HRyx)
Coherence Function (Two Signal Analysis)
Expresses a comparison of the power caused by the input signal of the transfer system and the total
output power.
It is derived from the cross power spectrum Gyx, input (reference) power spectrum Gxx,
and output (comparison) power spectrum Gyy.
Amplitude
Lin-Amp
|
𝐺𝐺𝑅𝑅𝑅𝑅
|
2
/(Gxx × Gyy)
NOTE
The coherence function equals 1 across the entire frequency with a single measurement. Make sure to
perform averaging of the frequency axis.
Octave Analysis
1/1 octave band or 1/3 octave band analysis can be performed.
This product derives the power spectrum first and then adds the data in each band range.
Amplitude
Lin-Amp
Oct x k1
Logarithmic amplitude
Log-Amp
10 x log(Oct x k1)
k1: Window function BW compensation coefficient
Rectangular
1
Hanning
0.666
Hamming
0.731
Содержание RA3100 Omniace
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Страница 173: ...13 Optional Parts 13 2 List of Probes Clamp Meters 1WMPD4004444 173 MEMO...
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