Interacoustics AT235 Service Manual page 39

Service Manual
AT235
Outputs:
Test types:
Audiometer functions
Signals:
Test types
NB noise – Ipsi, Reflex:
Stimulus duration:
Reflex acceptance:
Intervals:
Intensity max:
Contra Earphone:
Ipsi Earphone:
Probe connection:
Manual reflex:
Automated Reflex
Reflex decay:
Reflex latency:
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
Auto threshold determination (Modified Hughson Westlake)
Auto testing: duration 1-2 s adjusted in 0.1 s intervals
1000, 2000, 3000, 4000 Hz
750 ms
Adjustable between 2% and 6%, or 0.05 – 0.15 ml change
of ear canal volume
Down to 1 dB step size.
90, 100, 120 dBHL.
TDH39 earphone, DD45 earphone, CIR insert and/or
EARtone 3A insert for Reflex measurements.
Probe earphone incorporated in the probe system for
Reflex measurements
Connection of the electrical and air system to the probe
Manual control of all functions.
Single intensities
Reflex growth
Automatic, 10 dB above threshold and manually controlled
with stimulus durations of 10
Automated, first 300 ms from stimulus start
II