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AT235 Instructions for Use - EN
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
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