Interacoustics AT235 Instructions For Use Manual page 58

AT235 Instructions for Use - EN
Table 3: 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.
CIR55 DD45 Probe NB
Stimulus
Correction
Values
26 47.5 41 4
14 27 24.5 4
5.5 13 9.5 4
0 6 6.5 6
2 8 5 6
3 8 12 6
3.5 8 11 6
5.5 9 3.5 5
2 20.5 3 5
0 12 -5 5
-5 -8 -5
-7 -6 -7
-8 -10 -8
Variation of Ipsi Sound
stimulus levels attenuation
for different values for
volumes of the TDH39/DD45
ear canal earphones
using MX41/AR
Relative to the
or PN51
calibration
cushion
performed on
an IEC 126 [dB]
coupler
[dB]
0.5 ml 1 ml
3
5
9.7 5.3 7
9.7 5.3 15
21 (1600 Hz)
11.7 3.9 26
-0.8 -0.5 31 (3150 Hz)
-1.6 -0.8 32
26 (6300 Hz)
24
7.5 3.2
8.0 3.6
3.9 1.4
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