BRUEL & KJAER 2032 Instruction Manual page 160

The Probability Distribution function can be displayed in 512, 256, 128, 64 or 32 ampli-
tude intervals covering the input voltage range.
Similar for Ch.B.
13.2.7. Instantaneous Spectrum Ch.A or Ch.B
The 2-sided spectrum is defined as:
SA(k)
=
7 [ w(n) · a(n)]
0
~
n
~
N -1 , 0
~
k
~
N -1 , N
=
2048
w(n) is the weighting function
In zero pad measurement modes a(n)
=
0 for N/2 ~ n ~ N -1.
The 1-sided spectrum is defined as:
{
SA(k) for k
=
0
GA(k)
=
2 · SA(k) for 1
~
k
~
N/2-1
0 for N/2 ~ k ~ N -1
The displayed function is the 1-sided Instantaneous Spectrum GA(k), 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:
RMS
Power
Power spectral density
Energy spectral density
Similar for Ch.B.
13.2.8. Enhanced Spectrum Ch.A or Ch.B
GA(k):complex 1-sided spectrum of the Enhanced Time Function a(n).
Otherwise, as for Instantaneous Spectrum.
Similar for Ch.B.
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