Service Manual
AT235
VII
6.4 Survey of reference and max. hearing level Tone Audiometer
ANSI DD45
Coupler: IEC 60318-3 1998 (6ccm)
Tone Audiometer
Tone
Narrow Band Noise
PTB – DTU 2010
ISO 389-4 1994
Frequency
RETSPL
Max. HL
RETSPL
Max. HL
125
47.5
85
51.5
65
250
27.0
105
31.0
85
500
13.0
120
17.0
100
750
6.5
120
11.5
105
1000
6.0
120
12.0
105
1500
8.0
120
14.0
105
2000
8.0
120
14.0
105
3000
8.0
120
14.0
105
4000
9.0
120
14.0
105
6000
20.5
110
25.5
95
8000
12.0
105
17.0
95
White Noise
0
120
Table 2
IEC DD45
Coupler: IEC 60318-3 1998 (6ccm)
Tone Audiometer
Tone
Narrow Band Noise
PTB – DTU 2010
ISO 389-4 1994
Frequency
RETSPL
Max. HL
RETSPL Max. HL
125
47.5
85
51.5
65
250
27.0
105
31.0
85
500
13.0
120
17.0
100
750
6.5
120
11.5
105
1000
6.0
120
12.0
105
1500
8.0
120
14.0
105
2000
8.0
120
14.0
105
3000
8.0
120
14.0
105
4000
9.0
120
14.0
105
6000
20.5
110
25.5
95
8000
12.0
105
17.0
95
White Noise
0
120
Table 3
ANSI TDH39
Coupler: ANSI S3.7-1995 (NBS-9A) /
IEC 60318-3 1998 (6ccm)
Tone Audiometer
Tone
Narrow Band Noise
ANSI S3.6-2010
ANSI S3.6-2010
Frequency
RETSPL
Max. HL
RETSPL
Max. HL
125
45.0
85
49.0
70
250
25.5
105
29.5
90
500
11.5
120
15.5
105
750
8.0
120
13.0
105
1000
7.0
120
13.0
105
1500
6.5
120
12.5
105
2000
9.0
120
15.0
105
3000
10.0
120
16.0
105
4000
9.5
120
14.5
105
6000
15.5
120
20.5
100
8000
13.0
105
18.0
95
White Noise
0.0
120
Table 4
IEC TDH39
Coupler: IEC 60318-3 1998 (6ccm)
Tone Audiometer
Tone
Narrow Band Noise
ISO 389-1 1998
ISO 389-4 1994
Frequency
RETSPL
Max. HL
RETSPL
Max. HL
125
45.0
85
49.0
70
250
25.5
105
29.5
90
500
11.5
120
15.5
105
750
7.5
120
12.5
105
1000
7.0
120
13.0
105
1500
6.5
120
12.5
105
2000
9.0
120
15.0
105
3000
10.0
120
16.0
105
4000
9.5
120
14.5
105
6000
15.5
120
20.5
100
8000
13.0
105
18.0
95
White Noise
0.0
120
Table 5
ANSI EAR 3A / IP30
Coupler: ANSI S3.7-1995 (HA-2 with 5mm rigid Tube)
Tone Audiometer
Tone
Narrow Band Noise
ANSI S3.6-2010
ANSI S3.6-2010
Frequency
RETSPL
Max. HL
RETSPL
Max. HL
125
26.0
90
30.0
85
250
14.0
105
18.0
100
500
5.5
110
9.5
105
750
2.0
115
7.0
110
1000
0.0
120
6.0
110
1500
2.0
120
8.0
110
2000
3.0
120
9.0
110
3000
3.5
120
9.5
110
4000
5.5
115
10.5
105
6000
2.0
100
7.0
95
8000
0.0
90
5.0
90
White noise
0.0
110
Table 6
IEC EAR 3A / IP30
Coupler: IEC 60318-5 2006 2ccm
Tone Audiometer
Tone
Narrow Band Noise
ISO 389-2 1994
ISO 389-4 1994
Frequency
RETSPL
Max. HL
RETSPL
Max. HL
125
26.0
90
30.0
85
250
14.0
105
18.0
100
500
5.5
110
9.5
105
750
2.0
115
7.0
110
1000
0.0
120
6.0
110
1500
2.0
120
8.0
110
2000
3.0
120
9.0
110
3000
3.5
120
9.5
110
4000
5.5
115
10.5
105
6000
2.0
100
7.0
95
8000
0.0
90
5.0
90
White Noise
0.0
110
Table 7
