otometrics Madsen ZODIAC 901, Руководство пользователя

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fortably on the headset for clinical testing, or used as a hand-held probe
for fast screening purposes. A smaller headband is available for testing
children.
Remote indication
·
Colored lights on the probe indicate when a measurement is in prog-
ress, and also give warning in the event of air leakage, instability in the
measured ear cavity volume, or measurement interruption owing to
air leakage.
Remote Control
·
The start/stop button on the probe permits remote operation of the
ZODIAC 901.
Built-In Calibration
Data
·
Each probe supplied by Madsen Electronics has its calibration parame-
ters and serial number stored electronically in the probe, permitting
exchange of probe and/or cable without recalibration.
Calibration For Both
Types Of Phone
·
The probe can be calibrated to both TDH39 and insert phone, and will
automatically change from one set of phone calibration data to the
other when one changes phone.
Precision Cavity
·
The built-in Madsen Electronics 2 cc (2 ml) Precision Cavity enables the
ZODIAC 901 to be calibrated on a daily basis to take account of baro-
metric pressure, altitude, etc. The cavity incorporates a built-in rubber
seal, enabling calibration to be performed without the use of a separate
eartip.
Ear Simulator
·
Built-in Madsen Electronics’ Ear Simulator allows trouble-free training
and checking of the capabilities of the ZODIAC 901.
Headset
·
The comfortable, lightweight headset features a single integral cable
with specially developed connectors, which carry both the electrical
signals and the air-line from the pump. The stainless steel spring band
and genuine leather headband enable the headset to be adjusted
quickly and easily for each patient. A smaller headset for children is
also available as an optional accessory. The standard TDH 39 earphone
supplied may easily be replaced by an optional insert phone or bone
conductor.
1.2 APPLICATIONS OF THE ZODIAC 901
The ZODIAC 901 is designed for acoustic impedance and static pressure
measurements on the ear canal. These measurements (by themselves, or
in combination with pure tone audiometry) enable a variety of middle
ear and other disorders to be diagnosed.
The measurement techniques embodied in the ZODIAC 901 have the ad-
vantage of being
objective . Unlike pure tone audiometry, they depend
only on passive co-operation from the patient, not on the patient’s sub-
jective judgement. They can be performed more reliably than pure tone
audiometry measurements on children and other patients whose ability
to co-operate may be limited.
Operation Manual 3
GN Otometrics INTRODUCTION Chap. 1
ZODIAC 901 Middle-Ear Analyzer
APPLICATIONS OF THE ZODIAC 901
1.2