otometrics Madsen ZODIAC 901, Руководство пользователя

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Tone Switch Alternatively, press the Tone Switch to start the test and only one reflex
measurement will be made. If required, change frequency or intensity
and press the
Tone Switch again; another reflex measurement will be
made.
Softkey 3
Softkey 3 increases the Sound Pressure Level in increments of 5 dB (in-
crements of 1, 2 and 10 dB are available via Setup ); alternatively, use the
Rotary Knob to increase or reduce intensity level.
Ext. Range
The range of 50 to 105 dB may be extended by pressing the Ext. Range
button to 115 dB in Ipsi and to 120 dB in Contra.
Softkey 4 Softkey 4 allows the selection of either Ipsi or Contra.
Softkey 5 Pressing Softkey 5 displays the pump position graphically at the top of
the screen and allows you to adjust the pressure with the Rotary K nob
as long as Softkey 5 is kept pressed. The graphic scale shows how much
of the pump capacity is used to obtain the pressure shown. When Soft-
key 5 is released, the scale is removed and turning the Rotary Knob re-
verts to controlling intensity. Note that, if the MEP function has been
selected in Measurement Setup, the pressure will be automatically
changed by the selected level before the reflex measurement is started.
The ear canal pressure may also be set to be automatically equal to the
previously measured value of Middle Ear Pressure (MEP), using Setup
(§5.2.3.2).
L/R Shift When starting to test the patient’s other ear, remember to register the
change-over on the ZODIAC 901, otherwise the data for the first ear will
be overwritten. To change to the other ear, press
Alt. Select and then
Softkey 4 .
Setup Parameters Setup parameters available in Fast Screening Threshold Mode (see also
§5.2.3.2) are:
Stimulus increment: 1, 2, 5 or 10 dB
TH Step: 1, 2, 5, 10, 20, –20, –10, –5, –2, –1 dB
Max. no. of Measurements: 1 to 16
Y -Axis: Auto, negative, positive, positive/negative
Use Middle Ear Pressure: on or off*
Leak Detect: On/Off.
*In Version 3. x and later, this function is called Press.C. (Pressure Con-
trol) and is extended to: Manual, Auto, MEP +0, +5, +10, +15, +20, +25,
–25, –20, –15, –10, –5 daPa.
50 Operation Manual
MANUAL MODE Chap. 4 GN Otometrics
THRESHOLD TESTING
4.3 ZODIAC 901 Middle-Ear Analyzer