Service Manual
AT235
II
NB noise – Ipsi, Reflex:
1000, 2000, 3000, 4000 Hz
Stimulus duration:
750 ms
Reflex acceptance:
Adjustable between 2% and 6%, or 0.05 – 0.15 ml change
of ear canal volume
Intervals:
Down to 1 dB step size.
Intensity max:
90, 100, 120 dBHL.
Outputs:
Contra Earphone:
TDH39 earphone, DD45 earphone, CIR 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 dB HL:
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)
Auto testing: duration 1-2 s adjusted in 0.1 s intervals
