Interacoustics AT235 Mode D'emploi page 230

AT235 Instructions for Use - US
Reference Values for Stimulus Calibration
Freq. Reference Equivalent Threshold Sound Level
(RETSPL)
[dB re. 20 µPa]
[Hz] TDH39 EARtone
3A / IP30
125 45 26
250 25.5 14
500 11.5 5.5
1000 7 0
1500 6.5 2
2000 9 3
3000 10 3.5
4000 9.5 5.5
6000 15.5 2
8000 13 0
WB -8 -5
LP -6 -7
HP -10 -8
*All figures in bold are Interacoustics Standard values.
CIR DD45 Probe NB
26 47.5 41
14 27 24.5
5.5 13 9.5
0 6 6.5
2 8 5
3 8 12
3.5 8 11
5.5 9 3.5
2 20.5 3
0 12 -5
-5 -8 -5
-7 -6 -7
-8 -10 -8
Variation of Ipsi
stimulus levels
for different
volumes of the
ear canal
Relative to the
calibration
performed on
an IEC 126
coupler
[dB]
0.5 ml
Stimulus
Correction
Values
4
4
4 9.7
6 9.7
6
6 11.7
6 -0.8
5 -1.6
5
5
7.5
8.0
3.9
Page 49
Sound
attenuation
values for
TDH39/DD45
earphones
using MX41/AR
or PN51
cushion
[dB]
1 ml
3
5
5.3 7
5.3 15
21 (1600 Hz)
3.9 26
-0.5 31 (3150 Hz)
-0.8 32
26 (6300 Hz)
24
3.2
3.6
1.4