User guide
ELI
O
S
ECH001XN111-A4 – 07/2022
53
Handheld mode measurement
4.3 ECochG
4.3
ECochG
Erreur ! Source du renvoi introuvable.
to obtain the necessary instructions about the needed
equipment and the setup.
4.3.1
Setting up measurement parameters
Once the clinical
ECochG
diagnosis type has been se-
lected its configuration window appears. It is a way of
adjusting the parameters appearing in the following ta-
ble.
Power (dBHL)
Adjust intensity of the acoustic stimulation
Click / Second (Hz)
Number of clicks made per second
Advised: 11 clicks per second
Connected stimulator
To see which stimulator is connected and switch between the two audio
output
Tube
This option must be checked if you use a tube between the acoustic
stimulator and the subject's ear in order to automatically correct the de-
lay and the power loss induced by this tube.
Number of stims
Defined the number of averages (number of clicks) needed to obtain a
measurement.
Advised: at least 1000 averages
Left/Right
Used for selecting the
ear or ears
to be tested (if both ears are selected,
the test start on the left ear).
After selecting the ear and connecting the E
CHO
-
DIF
, the "
Start
" and "
Rejection
" buttons are activated. The central
rectangle displays the impedance value measured on the electrodes:
V+
V+
and
V-
in reference to
REF
.
The impedance values must be as small and well bal-
anced as possible to guarantee measurement quality.
As soon as the impedances are correct, calibrate rejection. This is an essential stage which must be carried out with
the greatest care possible. The purpose is to define the average muscular activity level of the patient at rest. Click on
"
Rejection
" to open the configuration window for this parameter.
The icon of a floppy disk at the bottom right of the screen is used for recording the parameters defined above.
They then become the default parameters for this type of measurement.
If value
V-
is greater than 7kΩ, wipe the patient’s forehead again and reattach new electrodes.
If value
V+
is greater than
7kΩ, check that the gold-plated electrode is inserted properly into the patient's ear
and add 1 or 2 drops of physiological serum to the ear canal.
If the
V+
and
V-
values are greater than 7kΩ, check that the clips and electrophysiology cable are properly con-
nected. If these 2 values are less than 10kΩ but are balanced (deviation < ±2k
), measurement is possible.
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