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13.2.9. Autospectrum Ch.A or Ch.B
The Autospectrum is defined as the 1-sided real-valued ensemble average of the
squared magnitude of the 1-sided instantaneous complex spectrum:
The displayed function is
GAA (k)
for
0
~
k
~
800,
and can be scaled as:
RMS
Power
Power spectral density
Energy spectral density
The spectrum can be A-weighted
Similar for Ch.B.
13.2.10. Cross Spectrum
The Cross Spectrum is defined as the complex ensemble average of the complex
product of the complex conjugated 1-sided Instantaneous Spectrum
G!(k)
and the 1-
sided Instantaneous Spectrum G
8
(k):
GAB (k) = G!(k) G
8
(k)
The displayed function is
GA
8
(k)
for
0
~
k
~
800.
It can be displayed in terms of:
Real part
Imaginary part
Magnitude
Phase
Nyquist plot
Nichols plot
The magnitude can be scaled as:
Power
Power spectral density
Energy spectral density
In Dual Spectrum Averaging mode,
H
1
is defined as:
151
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