Interacoustics AT235 Instructions For Use Manual page 56

AT235 Instructions for Use - EN
Calibration Properties
Calibrated Transducers: Contralateral Earphone:
Probe system:
Accuracy: General
Reflex Frequencies:
Contralateral Reflex and
Audiometer Tone Levels:
Ipsilateral Reflex Tone
Levels:
Pressure measurement :
Compliance measurement:
Stimulus Presentation Reflexes:
Control:
Impedance Calibration Properties
Probe tone Frequencies:
Level:
Distortion:
Compliance Range:
Temperature
dependence:
Pressure dependence:
Reflex sensitivity:
Reflex artifact level:
Temporal reflex
characteristics:
Telephonics TDH39/DD45 with a static force of 4.5N
0.5N and/or EARtone 3A and/or CIR33 insert phone
Ipsilateral Earphone: is integrated in the probe system
Probe frequency transmitter and receiver and
pressure transducer is integrated in the probe system
Generally the instrument is made and calibrated to be
within and better than the tolerances required in the
specified standards:
1%
3 dB for 250 to 4000Hz and 5 dB for 6000 to 8000Hz
5 dB for 500 to 2000Hz and +5/-10 dB for 3000 to
4000Hz
5% or 10 daPa, whichever is greater
5% or 0.1 ml, whichever is greater
ON-OFF ratio = ≥ 70 dB
Rise time = 20 ms
Fall time = 20 ms
A weighted SPL in Off = 31 dB
226 Hz 1%, 678 Hz 1%, 800 Hz 1%, 1000 Hz 1%
85 dB SPL 1.5 dB measured in an IEC 60318-5
acoustic coupler. The level is constant for all volumes
in the measurement range.
Max 1% THD
0.1 to 8.0 ml
-0.003 ml/C
-0.00020 ml/daPa
0.001 ml is the lowest detectable volume change
≥95 dB SPL (measured in the 711 coupler, 0.2 ml, 0.5
ml, 2.0 ml & 5.0 ml hardwalled cavities).
Initial latency = 35 ms (5 ms)
Rise time = 42 ms (5 ms)
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