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Ansi Free Field; Iec Free Field - Interacoustics AC40 Service Manual

Clinical audiometer
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AC40 Service Manual

ANSI Free Field

ANSI S3.6-2010
Binaural
0°
45°
Frequency
RETSPL RETSPL RETSPL RETSPL RETSPL RETSPL Max SPL
125
22.0
21.5
160
18.0
17.0
200
14.5
13.5
250
11.5
10.5
315
8.5
7.0
400
6.0
3.5
500
4.5
1.5
630
3.0
-0.5
750
2.5
-1.0
800
2.0
-1.5
1000
2.5
-1.5
1250
3.5
-0.5
1500
2.5
-1.0
1600
1.5
-2.0
2000
-1.5
-4.5
2500
-4.0
-7.5
3000
-6.0
-11.0
3150
-6.0
-11.0
4000
-5.5
-9.5
5000
-1.5
-7.5
6000
4.5
-3.0
6300
6.0
-1.5
8000
12.5
7.0
WhiteNoise
0.0
0.0

IEC Free Field

ISO 389-7 2005
Binaural
0°
45°
Frequency
RETSPL RETSPL RETSPL RETSPL RETSPL RETSPL Max SPL
125
22.0
21.5
160
18.0
17.0
200
14.5
13.5
250
11.5
10.5
315
8.5
7.0
400
6.0
3.5
500
4.5
1.5
630
3.0
-0.5
750
2.5
-1.0
800
2.0
-1.5
1000
2.5
-1.5
1250
3.5
-0.5
1500
2.5
-1.0
1600
1.5
-2.0
2000
-1.5
-4.5
2500
-4.0
-7.5
3000
-6.0
-11.0
3150
-6.0
-11.0
4000
-5.5
-9.5
5000
-1.5
-7.5
6000
4.5
-3.0
6300
6.0
-1.5
8000
12.5
7.0
WhiteNoise
0.0
0.0
¹The Binaural to Monaural correction on +2dB come from ANSI S3.6 -2004
The difference between 0° - 45° - 90° come from ISO 8253-2 1998.
The maximum free field levels depend on the amplifier, speaker and the acoustic conditions of the room. The actual maximum levels are found
using the Custom Max function in the calibration software.
ANSI Free Field
Monaural
90°
0°
45°
21.0
24.0
23.5
16.5
20.0
19.0
13.0
16.5
15.5
9.5
13.5
12.5
6.0
10.5
9.0
2.5
8.0
5.5
0.0
6.5
3.5
-2.0
5.0
1.5
-2.5
4.5
1.0
-3.0
4.0
0.5
-3.0
4.5
0.5
-2.5
5.5
1.5
-2.5
4.5
1.0
-3.0
3.5
0.0
-3.5
0.5
-2.5
-6.0
-2.0
-5.5
-8.5
-4.0
-9.0
-8.0
-4.0
-9.0
-5.0
-3.5
-7.5
-5.5
0.5
-5.5
-5.0
6.5
-1.0
-4.0
8.0
0.5
4.0
14.5
9.0
0.0
0.0
0.0
IEC
Monaural
90°
0°
45°
21.0
24.0
23.5
16.5
20.0
19.0
13.0
16.5
15.5
9.5
13.5
12.5
6.0
10.5
9.0
2.5
8.0
5.5
0.0
6.5
3.5
-2.0
5.0
1.5
-2.5
4.5
1.0
-3.0
4.0
0.5
-3.0
4.5
0.5
-2.5
5.5
1.5
-2.5
4.5
1.0
-3.0
3.5
0.0
-3.5
0.5
-2.5
-6.0
-2.0
-5.5
-8.5
-4.0
-9.0
-8.0
-4.0
-9.0
-5.0
-3.5
-7.5
-5.5
0.5
-5.5
-5.0
6.5
-1.0
-4.0
8.0
0.5
4.0
14.5
9.0
0.0
0.0
0.0
Free Field max HL is found by subtracting the selected RETSPL value
Free Field Power
90°
Tone
Max SPL
23.0
97
18.5
93
15.0
94.5
84.5
11.5
96.5
86.5
8.0
93.5
83.5
4.5
96
2.0
94.5
84.5
0.0
93
-0.5
92.5
82.5
-1.0
92
-1.0
92.5
82.5
-0.5
93.5
83.5
-0.5
92.5
82.5
-1.0
96.5
86.5
-1.5
93.5
83.5
-4.0
91
-6.5
94
-6.0
94
-3.0
94.5
84.5
-3.5
93.5
83.5
-3.0
94.5
84.5
-2.0
96
6.0
87.5
72.5
0.0
Free Field
Free Field max HL is found by subtracting the selected RETSPL value
Free Field Power
90°
Tone
Max SPL
23.0
97
18.5
93
15.0
94.5
84.5
11.5
96.5
86.5
8.0
93.5
83.5
4.5
96
2.0
94.5
84.5
0.0
93
-0.5
92.5
82.5
-1.0
92
-1.0
92.5
82.5
-0.5
93.5
83.5
-0.5
92.5
82.5
-1.0
96.5
86.5
-1.5
93.5
83.5
-4.0
91
-6.5
94
-6.0
94
-3.0
94.5
84.5
-3.5
93.5
83.5
-3.0
94.5
84.5
-2.0
96
6.0
87.5
72.5
0.0
Free Field max SPL
Free Field Line
NB
Tone
Max SPL
82
102
83
98
104.5
106.5
103.5
86
106
104.5
83
103
102.5
87
107
102.5
103.5
102.5
106.5
103.5
81
101
84
104
84
104
104.5
108.5
104.5
86
106
92.5
90
Free Field max SPL
Free Field Line
NB
Tone
Max SPL
82
102
83
98
104.5
106.5
103.5
86
106
104.5
83
103
102.5
87
107
102.5
103.5
102.5
106.5
103.5
81
101
84
104
84
104
104.5
108.5
104.5
86
106
92.5
90
Page 9
NB
Max SPL
97
93
99.5
101.5
98.5
101
99.5
98
97.5
102
97.5
98.5
97.5
101.5
98.5
96
94
94
99.5
98.5
99.5
96
87.5
100
NB
Max SPL
97
93
99.5
101.5
98.5
101
99.5
98
97.5
102
97.5
98.5
97.5
101.5
98.5
96
94
94
99.5
98.5
99.5
96
87.5
100
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