User guide
ELI
O
S
ECH001XN111-A4 – 07/2022
70
Handheld mode measurement
4.6 Shift-OAE
4.6.3.1
Advanced analysis tools
ELI
O
S
includes a high-performance tool palette that giving you the opportunity of analyzing directly on the touch
screen (without any computer support), all the data you have collected.
Click on one of the points of the curve. A window including a data analysis table appears. It contains several items of
information concerning the investigated signal.
Point spectral analysis
To run spectral analysis of the signal by a Fast Fourier
Transform (FFT) click on the "
Freq
" button.
The power distribution graph (abscissa) with respect to
the frequency (ordinate) appears. The effective spectral
energy zone is indicated by a vertical white line.
In the opposite example, 3 other spectral rays can be
identified with high power levels to the right of the ef-
fective spectral energy zone. From left to right, stimula-
tion frequency F1, followed by F2 and finally secondary
distortion product (2 *
F
2 –
F
1).
Point time analysis
To start the time analysis of the signal, click on the
“
Temp
” button. The cursor enables you to adjust the
maximum time value of the display window.
For this type of measurement, the general form of the
time signal can easily be identified. It represents the
modulation of stimulation frequencies F1 and F2
The column in green represents the distortion products investigated in the previous phase graph. This value
can be modified. Refer to paragraph
Erreur ! Source du renvoi introuvable.
.
2
∗
F
1
−
F
2
Main distortion product
F
1
Stimulation frequency F1
F
2
Stimulation frequency F2
2
∗
F
2
−
F
1
Secondary distortion product
FREQ
Frequency in Hz
POWER
Power in dB
PHASE
Phase shift in degrees
S/N
𝑆𝑖𝑔𝑛𝑎𝑙
𝑁𝑜𝑖𝑠𝑒
ratio in dB
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