otometrics Madsen ZODIAC 901, Руководство пользователя

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4.3.3 AIR CONDUCTION
Air Conduction
Thresholds This test mode enables the operator to use TDH 39 contra headphones
for determining air conduction thresholds. It also allows a bone-
conductor to be used for performing Gellé’s test, to investigate the mo-
bility of the ossicles, and especially of the stapes.
Softkey 3 Press Main Menu and use Softkey 5 to select Advanced Mode. Press
Threshold to display the Threshold Menu. Press Softkey 3 from the
Threshold Menu to access the screen shown in Fig.4.22.
Tone Switch Press the Tone Switch to present the stimulus.
Softkeys 1 / 3 The threshold values may be plotted on an audiogram on the dis-
play—just select frequency using
Softkey 1 and Sound Pressure Level in
dB using Softkey 3 or the Rotary Knob .
Ext. Range The range 0–100 dB may be extended by pressing the Ext. Range button
to 120 dB.
Softkey 2 Press Softkey 2 to plot each threshold on the audiogram. Any values
may be entered; Fig.4.23 shows an example.
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
.
Operation Manual 51
GN Otometrics MANUAL MODE Chap. 4
ZODIAC 901 Middle-Ear Analyzer
THRESHOLD TESTING
4.3
Fig.4.22
Air ConductionThreshold before
measurement
Fig.4.23
Air ConductionThreshold after
measurement