Calibration Properties - Interacoustics AT235 Instructions For Use Manual

5.1 Calibration Properties

Calibrated Transducers: Contralateral
Accuracy:
Stimulus Presentation
Control:
Impedance Calibration Properties
Probe tone
Compliance
Pressure
Barometric pressure
D-0128073-C – 2022/05
AT23 5 - Instructions for Use - US
Earphone:
Probe system:
General
Ref lex Frequencies:
Contralateral Ref lex
and Audiometer Tone
Levels:
Ipsilateral Ref lex Tone
Levels:
Pressure
measurement:
Compliance
measurement:
Ref lexes:
Frequencies:
Level:
Distortion:
Range:
Temperature
dependence:
Pressure dependence:
Ref lex sensitivity:
Ref lex artif act level:
Temporal ref lex
characteristics:
(IEC60645-5 clause
5.1.6)
Range:
Saf ety limits:
The barometer
pressure chances
inf luence on the
impedance
measurement in the
specif ied range (97300
– 105300 Pascal).
Telephonics TDH39/DD45 with a static f orce of 4.5N
±0.5N
Ipsilateral Earphone: is integrated in the probe system
Probe f requency 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
specif ied standards:
±1%
3 dB f or 250 to 4000Hz and 5 dB f or 6000 to 8000Hz
5 dB f or 500 to 2000Hz and +5/-10 dB f or 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 Of f = 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 f or 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)
Terminal latency = 23 ms (5 ms)
Fall time = 44 ms (5 ms)
Overshoot = max. 1%
Undershoot = max. 1%
Values between -600 to +400 daPa can be selected in
the setup.
-750 daPa and +550 daPa, 50 daPa
Admittance can vary inside: ± 4%
The pressure accuracy is: ±10 daPa or 10%, whichever
is greater.
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