User's Manual

51
REFERENCE EQUIVALENT THRESHOLD LEVELS
FF
ISO 389
-7
(ANSI S3.6)
[dB]
re 20 µPa]
22.1
11.4
4.4
2.4
2.4
2.4
-1.3
-5.8
-5.4
4.3
12.6
(*) The calibration of the bone vibrator (B71) refers to positioning on the mastoid bone.
Reference standards: ISO 389
-1, ISO 389
-2, ISO 389
-3, ISO 389
-5, ISO 389
-7, ISO 389
-8 and ANSI S3.6
.
B71
*
ISO 389
-3
(ANSI S3.6)
[dB]
re 1 µPa]
-
67
58
48.5
42.5
36.5
31
30
35.5
40
40
ER 3C
ISO 389
-2
(ANSI S3.6)
[dB]
re 20 µPa]
26
14
5.5
2
0
2
3
3.5
5.5
2
0
DD45
ISO 389
-1
[dB]
re 20 µPa]
47.5
27
13
6.5
6
8
8
8
9
20.5
12
TDH 39
ISO 389
-1
(ANSI S3.6)
[dB]
re 20 µPa]
45
25.5
11.5
7.5 (8)
7
6.5
9
10
9.5
15.5
13
Freq
[Hz]
125
250
500
750
1000
1500
2000
3000
4000
6000
8000