Interacoustics AT235 Instructions For Use Manual page 53

Reference Values for Stimulus Calibration
Freq. Ref erence Equivalent Threshold Sound Level
(RETSPL)
[dB re. 20 µPa]
[Hz] TDH39 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 f igures in bold are Interacoustics Standard values.
D-0128073-C – 2022/05
AT23 5 - Instructions for Use - US
DD65 v2 DD45 Probe NB
30,5 47.5 41
17 27 24.5
8 13 9.5
4,5 6 6.5
2,5 8 5
2,5 8 12
2 8 11
9,5 9 3.5
21 20.5 3
21 12 -5
-8 -8 -5
-6 -6 -7
-10 -10 -8
Variation of Ipsi
stimulus levels
f or dif ferent
volumes of the
ear canal
Relative to the
calibration
perf ormed 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
Sound
attenuation
values f or
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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