Interacoustics AT235 Instructions For Use

AT235 Instructions for Use - EN Page 46
Eustachian tube function 1
– Non perforated eardrum
Williams test
Eustachain tube function 2
- Perforated eardrum
Toynbee test
Eustachian tube function 3
- Patulous Eustachian tube
Continuous sensitive impedance measurement
Reflex Functions
Signal sources: Tone - Contra, Reflex: 250, 500, 1000, 2000, 3000, 4000, 6000, 8000 Hz,
Wide Band, High and Low pass
Tone - Ipsi, Reflex: 500, 1000, 2000, 3000, 4000 Hz wide band, high and
low pass.
NB noise – Contra, Reflex
250, 500, 1000, 2000, 3000, 4000, 6000, 8000 Hz
NB noise – Ipsi, Reflex
1000, 2000, 3000, 4000 Hz
Stimulus duration:
1.0 sec
Reflex Acceptance Adjustable between 2% and 6%, or 0.05 – 0.15 ml
change of ear canal volume.
Intensity max
90, 100, 120, dBHL.
Outputs: Contra Earphone: TDH39 earphone, DD45 earphone, CIR33 insert
and/or EARtone 3A insert for Reflex measurements.
Ipsi Earphone: Probe earphone incorporated in the probe system for
Reflex measurements.
Probe connection Connection of the electrical and air system to the
probe.
Test types:
Manual Reflex
Manual control of all functions.
Automated Reflex Single intensities
Reflex growth
Reflex Decay Automatic, 10 dB above threshold and manually
controlled with stimulus durations of 10 .
Reflex latency
Automated, first 300 ms from stimulus start.
Audiometer Functions
Signals:
Frequencies Hz:
Intensities dBHL:
125
-10 to 70
250
-10 to 90
500
-10 to 100
1000
-10 to 100
2000
-10 to 100
3000
-10 to 100
4000
-10 to 100
6000
-10 to 100
8000
-10 to 90
Test types
Auto Threshold Determination (Modified Hughson Westlake).

Interacoustics AT235 Specifications

General

Brand	Interacoustics
Model	AT235
Category	Measuring Instruments
Language	English