Reference Values For Stimulus Calibration - Interacoustics AT235 Service Manual

Service Manual
AT235
6.2

Reference values for stimulus calibration

Freq. Reference Equivalent Threshold Sound Level
(RETSPL)
[dB re. 20 µPa]
[Hz] TDH39
125 45
250 25.5
500 11.5
1000 7
1500 6.5
2000 9
3000 10
4000 9.5
6000 15.5
8000 13
WB -8
LP -6
HP -10
*All figures in bold are Interacoustics Standard values.
EARtone DD65 v2
3A / IP30
26 30,5
14 17
5.5 8
0 4,5
2 2,5
3 2,5
3.5 2
5.5 9,5
2 21
0 21
-5 -8
-7 -6
-8 -10
DD45 Probe NB
Stimulus
Correction
Values
47.5 41 4
27 24.5 4
13 9.5 4
6 6.5 6
8 5 6
8 12 6
8 11 6
9 3.5 5
20.5 3 5
12 -5 5
-8 -5
-6 -7
-10 -8
Variation of Ipsi Sound
stimulus levels attenuation
for different values for
volumes of the TDH39/DD45
ear canal earphones using
Relative to the MX41/AR or
calibration PN51 cushion
performed on an [dB]
IEC 126 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
V