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10. 10Appendix - 10.4. FFT Analysis
134
1WMPD4004444
Exponentially Weighted Average
The averaging process for the frequency component of the analysis results, which performs averaging
by exponentially weighting each element to average.
(Example) When the number of additions N = 3
E1 = Y1
E2 = (1 -
α
) E1 +
α
Y2
E3 = (1 -
α
) E2 +
α
Y3
α
: Weighted average constant
α
= 1 / N
Frequency Axis Peak Hold
Retains the maximum value of each frequency component.
10.4.3. Units of Analysis Results
The units of the analysis results are indicated below.
Analysis
X axis
Unit
Time scale waveform
Time
s
Other analysis
Frequency
Hz
Analysis
Y axis
Unit
Time scale waveform
Amplitude
Linear
eu
Linear spectrum
Real number part
Lin-Rel
eu
Imaginary number part
Lin-Img
eu
Amplitude
Lin-Amp
eu
Logarithmic amplitude
Log-Amp
db
Phase
Phase
deg
RMS spectrum
Real number part
Lin-Rel
eu
Imaginary number part
Lin-Img
eu
Amplitude
Lin-Amp
eu
Logarithmic amplitude
Log-Amp
db
Phase
Phase
deg
Power spectrum
Amplitude
Lin-Amp
eu
2
Logarithmic amplitude
Log-Amp
db
Power spectrum density
Amplitude
Lin-Amp
eu
2
/Hz
Logarithmic amplitude
Log-Amp
db
Cross power spectrum
Real number part
Lin-Rel
eu
2
Imaginary number part
Lin-Img
eu
2
Amplitude
Lin-Amp
eu
2
Logarithmic amplitude
Log-Amp
db
Phase
Phase
deg
Transfer function
Real number part
Lin-Rel
No unit
Imaginary number part
Lin-Img
No unit
Amplitude
Lin-Amp
No unit
Logarithmic amplitude
Log-Amp
db
Phase
Phase
deg
Coherence function
Amplitude
Lin-Amp
No unit
1/1 octave analysis
Amplitude
Lin-Amp
eu
Logarithmic amplitude
Log-Amp
db
1/3 octave analysis
Amplitude
Lin-Amp
eu
Logarithmic amplitude
Log-Amp
db
Summary of Contents for RA3100 Omniace
Page 1: ...RA3100 Omniace Instruction Manual 1WMPD4004444...
Page 173: ...13 Optional Parts 13 2 List of Probes Clamp Meters 1WMPD4004444 173 MEMO...
Page 174: ...13 Optional Parts 13 4 List of Spare Parts 174 1WMPD4004444 MEMO...
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