User Manual

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8.7 Analysis Function
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8
.7.4 Power Spectrum [PSP]
Functio
n
Gaa = Fa*
･
Fa
=｛Re
2
(Fa) + Im
2
(Fa)｝
= |Fa|
DC component:
Gaa = Fa*･Fa
=｛Re
2
(Fa) + Im
2
(Fa)｝
= |Fa|
2
Fa*：complex conjugate of Fa
Re（Fa）：real number component of Fa
Im（Fa）：imaginary number component of Fa
Horizonta
l
curso
r
Vertica
l
curso
r
Vertical axis Display
LIN-REAL (real-number part) −
LIN-IMAG (imaginary-number part) −
LIN-MAG (amplitude) Gaa
LOG-MAG (logarithmic amplitude) 10 log |Gaa|
PHASE (phase) −
NOTE
Displays the energy spectrum of the input signal, consisting of only magnitude
information.
Major applications include:
・Determining the peaks of waveform frequency components
・Determining the energy levels of high and low harmonics
LIN-Hz Frequency spectrum display as linear units. The range is from
DC to the maximum frequency range value.
LOG Hz Frequency spectrum display as logarithmic units. The range is
from 1/400 to 1/4000 the maximum frequency range value to the
maximum frequency range value.
LIN-MAG Linear display of analysis data as binary exponential voltage
This expresses the energy component.
LOG-MAG Logarithmic display of analysis data as dB
(0dB reference value: 1 V
2
rms)
The LOG-MAG display and the RMS spectrum display express the same
processing result.