otometrics Madsen ZODIAC 901, Руководство пользователя

Страница: 64 / 100

This last function is not applicable for Manual Tymp.
and may be over-ridden by
Ext. Range .
Measurement
Direction Measurement
Direction: You may select between negative or positive (and
positive/negative in Manual Tymp.).
Leak Detect On/Off Leak Detect: On or Off
NOTE NOTE: These Setup parameters do not apply to the ETF Perforated
Eardrum test.
5.2.2 REFLEX TESTING
Stimulus SPL
Increments Stimulus SPL
Increments: The following settings are available: 1, 2, 5, 10 dB.
Scaling Y -axis Scaling
(Compliance):
Together with the Y -axis parameter, it is possible to
select numerous different reflex threshold
configurations. Here, it is possible to select 75, 150,
225, 300, 375
m
l of volume, or Auto.
If Auto is selected, the instrument will automatically
select the volume which displays the measured curve
in the greatest detail.
Sweep Speed Speed: Display filter speed may be selected as fast or slow:
the latter setting gives less noise but is less accurate
when measuring reflex latency.
Y–Axis Y –Axis: It is possible to select between Pos(itive), Neg(ative),
Pos/Neg and Auto.
If Auto is selected, the instrument will automatically
select whichever Y–axis displays the measured curve
in the greatest detail.
Use MEP
Use MEP
(Press.C.):
Selects whether automatic adjustment of MEP
(middle-ear pressure) is on or off. In Version 3.
x ,
Pressure Control includes: Manual, Auto, MEP+5,
+10, +15, +20, +25, –25, —20, –15, –10, –5 daPa. When
Auto is selected, an automatic offset to MEP is
calculated on the basis of Gradient and TW.
Threshold Level Use THL: In the setup for reflex decay, pressing Softkey 2
enables you to select THL (Threshold Level) Off or to
present stimulus at a level of 0, 5, 10, 15 or 20 dB above
the previously found reflex threshold at any given
frequency.
If you have measured reflex thresholds using both
Reflex Threshold and Fast Screening, the value found
58 Operation Manual
SUPPLEMENTARY FUNCTIONS Chap. 5 GN Otometrics
SETUP
5.2 ZODIAC 901 Middle-Ear Analyzer