AA222 Instructions for Use – US Page 69
The pressure accuracy is: ±10 daPa or 10%, whichever is greater.
To minimize the influence of temperature, barometer pressure, humidity and
height above sea level, it always recommended to calibrate the unit in the local
positions.
The temperature have no theoretic impact on the impedance calculation, but the
temperature has influence on the electronic circuits. This temperature influence for
the standard specified temperature range (15-35 °C) is inside:
Admittance can
vary inside: ± 5%, ± 0.1 cm
3
, ±10
-9
m
3
/Pa·s, whichever is greater.
Reflex Calibration Standards and Spectral Properties:
Specifications for stimulus and audiometer signals are made to follow IEC 60645-5
ISO 389-1 for TDH39 and ISO 389-2 for CIR.
Spectral properties:
As “Broad band noise” specified in IEC 60645-5, but
with 500 Hz as lower cut-off frequency.
Spectral properties:
Uniform from 500 Hz to 1600 Hz, 5 dB re. 1000 Hz
Spectral properties:
Uniform from 1600 Hz to 10KHz, 5 dB re. 1000 Hz
Spectral properties:
As “Broad band noise” specified in IEC 60645-5, but
with 500 Hz as lower cut-off frequency.
Spectral properties:
Uniform from 500 Hz to 1600 Hz, 10 dB re. 1000 Hz
Spectral properties:
Uniform from 1600 Hz to 4000 Hz, 10 dB re. 1000 Hz
The actual sound pressure level at the eardrum will
depend on the volume of the ear.
The risk of artifacts at higher stimulus levels in reflex measurements are minor and will not activate the
reflex detection system
To Next Page
Loading...
Need help?
General
