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SERVICE MANUAL INTERACOUSTICS
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Clinical Audiometer AC40
Part number 8100837 Rev. 2
Valid from 10/2013
Service Manual
AC40 Service Manual Page 2
Contents
Contents 1
General information 2
Survey of reference and max hearing level Tone Audiometer 3
ANSI Free Field 7
IEC Free Field 7
Survey of reference and max hearing level Speech Audiometer 8
Swedish Speech calibration 10
Norwegian Speech Calibration 11
Equivalent free field 12
General properties for earphones 12
Accessories and Parts 14
Accessories 14
Consumables and Parts 17
Schematics 19
Block Diagram 19
Disassembly 20
Open the Cabinet 20
Remove the PCA Back Board and Side Board 21
Remove the Power Supply 22
Remove the Display 23
Adjusting the knobs after reassembly 24
Calibration Procedure 26
Service, adjustment and repair 26
Phasing of headphones 27
Calibration of test equipment 27
Calibration Mode Entering 27
Checklist for calibration 28
Calibration standard for Audiometer 29
Selecting TDH39 headset 30
Selecting DD45 headset 33
Selecting HDA200 headset 36
Selecting HDA280 headset 39
Selecting EAR3A Insert phone 42
Selecting EAR5A Insert phone 45
Selecting CIR22/CIR33 Insert masking transducer 48
Selecting B71 Bone transducer 51
Calibration procedure Free Field and Custom Max 54
Select Free field setup 55
Custom max. 56
Transducer calibration 57
Update procedure - Firmware 58
Installing MHA (Master Hearing Aid) wave files: 58
AC40 Stand Alone Unit, Print Logo Update 58
Appendix A Update News 1
AC40 Service Manual Page 3
General information
Interacoustics continuously strives to improve its products and their performance, therefore the specifications can be
subject to change without notice.
The performance and specifications of the instrument can only be guaranteed if it is subject to technical maintenance
at least once a year. This should be done by a workshop authorized by Interacoustics (refer to calibration procedure on
page 26).
Questions about representatives and products may be sent to:
Interacoustics A/S Phone: +45 63713555
Drejervaenget 8 Fax: +45 63713522
DK 5610 Assens e-mail: [email protected]
Denmark http: www.interacoustics.com
AC40 Service Manual Page 4
Survey of reference and max hearing level Tone Audiometer
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 MaxHL RETSPL MaxHL
125 45.0 90 49.0 75
160 37.5 95 41.5 85
200 31.5 100 35.5 90
250 25.5 110 29.5 95
315 20.0 115 24.0 100
400 15.0 120 19.0 105
500 11.5 120 15.5 110
630 8.5 120 13.5 110
750 8.0 120 13.0 110
800 7.0 120 12.0 110
1000 7.0 120 13.0 110
1250 6.5 120 12.5 110
1500 6.5 120 12.5 110
1600 7.0 120 13.0 110
2000 9.0 120 15.0 110
2500 9.5 120 15.5 110
3000 10.0 120 16.0 110
3150 10.0 120 16.0 110
4000 9.5 120 14.5 110
5000 13.0 120 18.0 110
6000 15.5 120 20.5 110
6300 15.0 120 20.0 110
8000 13.0 110 18.0 100
WhiteNoise 0.0 120
TEN Noise 25.0 110
The RETSPL is copy from ISO389-1 1998
ANSI HDA 280
Coupler ANSI S3.7-1995 (NBS-9A) /
IEC 60318-3 1998 (6ccm)
Tone Audiometer
Tone Narrow Band Noise
PTB PTB
Frequency RETSPL MaxHL RETSPL MaxHL
125 38.5 105 42.5 75
160 33.5 110 37.5 80
200 29.5 115 33.5 85
250 25.0 120 29.0 90
315 21.0 120 25.0 95
400 17.0 120 21.0 95
500 13.0 120 17.0 100
630 10.5 120 15.5 100
750 9.0 120 14.0 105
800 8.5 120 13.5 105
1000 7.5 120 13.5 105
1250 8.5 120 14.5 105
1500 9.5 120 15.5 105
1600 9.0 120 15.0 105
2000 8.0 120 14.0 105
2500 7.0 120 13.0 105
3000 6.5 120 12.5 105
3150 7.0 120 13.0 105
4000 9.5 120 14.5 105
5000 12.0 120 17.0 105
6000 19.0 115 24.0 95
6300 19.0 115 24.0 95
8000 18.0 105 23.0 90
WhiteNoise 0.0 120
This value is interpolated on Interacoustics
IEC TDH39
Coupler: IEC 60318-3 1998 (6ccm)
Tone Audiometer
Tone Narrow Band Noise
ISO 389-1 1998 ISO 389-4 1994
Frequency RETSPL MaxHL RETSPL MaxHL
125 45.0 90 49.0 75
160 37.5 95 41.5 85
200 31.5 100 35.5 90
250 25.5 110 29.5 95
315 20.0 115 24.0 100
400 15.0 120 19.0 105
500 11.5 120 15.5 110
630 8.5 120 13.5 110
750 7.5 120 12.5 110
800 7.0 120 12.0 110
1000 7.0 120 13.0 110
1250 6.5 120 12.5 110
1500 6.5 120 12.5 110
1600 7.0 120 13.0 110
2000 9.0 120 15.0 110
2500 9.5 120 15.5 110
3000 10.0 120 16.0 110
3150 10.0 120 16.0 110
4000 9.5 120 14.5 110
5000 13.0 120 18.0 110
6000 15.5 120 20.5 110
6300 15.0 120 20.0 110
8000 13.0 110 18.0 100
WhiteNoise 0.0 120
TEN Noise 25.0 110
IEC HDA 280
Coupler IEC 60318-3 1998 (6ccm)
Tone Audiometer
Tone Narrow Band Noise
PTB ISO 389-4 1994
Frequency RETSPL MaxHL RETSPL MaxHL
125 38.5 105 42.5 75
160 33.5 110 37.5 80
200 29.5 115 33.5 85
250 25.0 120 29.0 90
315 21.0 120 25.0 95
400 17.0 120 21.0 95
500 13.0 120 17.0 100
630 10.5 120 15.5 100
750 9.0 120 14.0 105
800 8.5 120 13.5 105
1000 7.5 120 13.5 105
1250 8.5 120 14.5 105
1500 9.5 120 15.5 105
1600 9.0 120 15.0 105
2000 8.0 120 14.0 105
2500 7.0 120 13.0 105
3000 6.5 120 12.5 105
3150 7.0 120 13.0 105
4000 9.5 120 14.5 105
5000 12.0 120 17.0 105
6000 19.0 115 24.0 95
6300 19.0 115 24.0 95
8000 18.0 105 23.0 90
AC40 Service Manual Page 5
WhiteNoise 0.0 120
This value is interpolated on Interacoustics
IEC EAR 3A
Coupler: IEC 60318-5 2006 2ccm
Tone Audiometer
Tone Narrow Band Noise
ISO 389-2 1994 ISO 389-4 1994
Frequency RETSPL MaxH
L
RETSPL MaxHL
125 26.0 90 30.0 90
160 22.0 95 26.0 95
200 18.0 100 22.0 100
250 14.0 105 18.0 105
315 12.0 105 16.0 105
400 9.0 110 13.0 105
500 5.5 110 9.5 110
630 4.0 115 9.0 110
750 2.0 115 7.0 110
800 1.5 115 6.5 110
1000 0.0 120 6.0 110
1250 2.0 120 8.0 110
1500 2.0 120 8.0 110
1600 2.0 120 8.0 110
2000 3.0 120 9.0 110
2500 5.0 120 11.0 110
3000 3.5 120 9.5 110
3150 4.0 120 10.0 110
4000 5.5 115 10.5 110
5000 5.0 105 10.0 105
6000 2.0 100 7.0 100
6300 2.0 100 7.0 100
8000 0.0 95 5.0 95
WhiteNoise 0.0 110
AC40 Service Manual Page 6
ANSI HDA 200
Coupler: IEC60318-2 with type 1 adaptor
Tone Audiometer
Tone Narrow Band Noise
ANSI S3.6-2010 ANSI S3.6-2010
Frequency RETSPL MaxHL RETSPL 1/3 MaxHL
125 30.5 100 34.5 75
160 26.0 105 30.0 80
200 22.0 105 26.0 80
250 18.0 110 22.0 85
315 15.5 115 19.5 90
400 13.5 115 17.5 95
500 11.0 115 15.0 95
630 8.0 120 13.0 95
750 6.0 120 11.0 100
800 6.0 120 11.0 100
1000 5.5 120 11.5 100
1250 6.0 110 12.0 95
1500 5.5 115 11.5 100
1600 5.5 115 11.5 100
2000 4.5 115 10.5 100
2500 3.0 115 9.0 100
3000 2.5 115 8.5 100
3150 4.0 115 10.0 100
4000 9.5 115 14.5 100
5000 14.0 105 19.0 95
6000 17.0 105 22.0 90
6300 17.5 105 22.5 90
8000 17.5 105 22.5 90
9000 19.0 100 24.0 85
10000 22.0 100 27.0 85
11200 23.0 95 28.0 80
12500 27.5 90 32.5 75
14000 35.0 80 40.0 70
16000 56.0 60 61.0 50
18000 83.0 30 88.0 20
20000 105.0 15 110.0 0
WhiteNoise 0.0 115
The RETSPL is copy from ISO389-8 2001.
numbers have been established and accepted in the industry
ANSI EAR 3A
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 MaxHL RETSPL MaxHL
125 26.0 90 30.0 90
160 22.0 95 26.0 95
200 18.0 100 22.0 100
250 14.0 105 18.0 105
315 12.0 105 16.0 105
400 9.0 110 13.0 105
500 5.5 110 9.5 110
630 4.0 115 9.0 110
750 2.0 115 7.0 110
800 1.5 115 6.5 110
1000 0.0 120 6.0 110
1250 2.0 120 8.0 110
1500 2.0 120 8.0 110
1600 2.0 120 8.0 110
2000 3.0 120 9.0 110
2500 5.0 120 11.0 110
3000 3.5 120 9.5 110
3150 4.0 120 10.0 110
4000 5.5 115 10.5 110
5000 5.0 105 10.0 105
6000 2.0 100 7.0 100
6300 2.0 100 7.0 100
8000 0.0 95 5.0 95
WhiteNoise 0.0 110
IEC HDA 200
Coupler: IEC60318-1 with type 1 adaptor
Tone Audiometer
Tone Narrow Band Noise
ISO 389-8 2004 ISO 389-4 1994
Frequency RETSPL MaxHL RETSPL 1/3 MaxHL
125 30.5 100 34.5 75
160 26.0 105 30.0 80
200 22.0 105 26.0 80
250 18.0 110 22.0 85
315 15.5 115 19.5 90
400 13.5 115 17.5 95
500 11.0 115 15.0 95
630 8.0 120 13.0 95
750 6.0 120 11.0 100
800 6.0 120 11.0 100
1000 5.5 120 11.5 100
1250 6.0 110 12.0 95
1500 5.5 115 11.5 100
1600 5.5 115 11.5 100
2000 4.5 115 10.5 100
2500 3.0 115 9.0 100
3000 2.5 115 8.5 100
3150 4.0 115 10.0 100
4000 9.5 115 14.5 100
5000 14.0 105 19.0 95
6000 17.0 105 22.0 90
6300 17.5 105 22.5 90
8000 17.5 105 22.5 90
ISO 389-5 2006 ISO 389-5 2006 + 5 dB
8000 17.5 105 22.5 90
9000 19.0 100 24.0 85
10000 22.0 100 27.0 85
11200 23.0 95 28.0 80
12500 27.5 90 32.5 75
14000 35.0 80 40.0 70
16000 56.0 60 61.0 50
18000 83.0 30 88.0 20
20000 105.0 15 110.0 0
WhiteNoise 0.0 115
numbers have been established and accepted in the industry
AC40 Service Manual Page 7
ANSI Ear 5A
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 MaxHL RETSPL MaxHL
125 26.0 95 30.0 85
160 22.0 95 26.0 90
200 18.0 100 22.0 95
250 14.0 100 18.0 100
315 12.0 105 16.0 100
400 9.0 105 13.0 105
500 5.5 110 9.5 110
630 4.0 115 9.0 110
750 2.0 120 7.0 110
800 1.5 120 6.5 110
1000 0.0 120 6.0 110
1250 2.0 120 8.0 110
1500 2.0 120 8.0 110
1600 2.0 120 8.0 110
2000 3.0 120 9.0 110
2500 5.0 120 11.0 110
3000 3.5 120 9.5 110
3150 4.0 120 10.0 110
4000 5.5 120 10.5 110
5000 5.0 110 10.0 110
6000 2.0 105 7.0 105
6300 2.0 105 7.0 105
8000 0.0 100 5.0 100
WhiteNoise 0.0 110
ANSI CIR 22/CIR33
Coupler ANSI S3.7-1995 (HA-2)
Tone Audiometer
Tone Narrow Band Noise
ANSI S3.6-2010 ANSI S3.6-2010
Frequency RETSPL MaxHL RETSPL MaxHL
125 26.0 90 30.0 90
160 22.0 95 26.0 95
200 18.0 100 22.0 100
250 14.0 105 18.0 105
315 12.0 105 16.0 105
400 9.0 110 13.0 105
500 5.5 110 9.5 110
630 4.0 115 9.0 110
750 2.0 115 7.0 110
800 1.5 115 6.5 110
1000 0.0 120 6.0 110
1250 2.0 120 8.0 110
1500 2.0 120 8.0 110
1600 2.0 120 8.0 110
2000 3.0 120 9.0 110
2500 5.0 120 11.0 110
3000 3.5 120 9.5 110
3150 4.0 120 10.0 110
4000 5.5 115 10.5 105
5000 5.0 105 10.0 95
6000 2.0 100 7.0 95
6300 2.0 100 7.0 95
8000 0.0 90 5.0 90
WhiteNoise 0.0 110
IEC Ear 5A
Coupler IEC 60318-5 2006 2ccm
Tone Audiometer
Tone Narrow Band Noise
ISO 389-2 1994 ISO 389-4 1994
Frequency RETSPL MaxHL RETSPL MaxHL
125 26.0 95 30.0 85
160 22.0 95 26.0 90
200 18.0 100 22.0 95
250 14.0 100 18.0 100
315 12.0 105 16.0 100
400 9.0 105 13.0 105
500 5.5 110 9.5 110
630 4.0 115 9.0 110
750 2.0 120 7.0 110
800 1.5 120 6.5 110
1000 0.0 120 6.0 110
1250 2.0 120 8.0 110
1500 2.0 120 8.0 110
1600 2.0 120 8.0 110
2000 3.0 120 9.0 110
2500 5.0 120 11.0 110
3000 3.5 120 9.5 110
3150 4.0 120 10.0 110
4000 5.5 120 10.5 110
5000 5.0 110 10.0 110
6000 2.0 105 7.0 105
6300 2.0 105 7.0 105
8000 0.0 100 5.0 100
WhiteNoise 0.0 110
IEC CIR 22/CIR33
Coupler IEC 60318-5 2006 2ccm
Tone Audiometer
Tone Narrow Band Noise
ISO 389-2 1994 ISO 389-4 1994
Frequency RETSPL MaxHL RETSPL MaxHL
125 26.0 90 30.0 90
160 22.0 95 26.0 95
200 18.0 100 22.0 100
250 14.0 105 18.0 105
315 12.0 105 16.0 105
400 9.0 110 13.0 105
500 5.5 110 9.5 110
630 4.0 115 9.0 110
750 2.0 115 7.0 110
800 1.5 115 6.5 110
1000 0.0 120 6.0 110
1250 2.0 120 8.0 110
1500 2.0 120 8.0 110
1600 2.0 120 8.0 110
2000 3.0 120 9.0 110
2500 5.0 120 11.0 110
3000 3.5 120 9.5 110
3150 4.0 120 10.0 110
4000 5.5 115 10.5 105
5000 5.0 105 10.0 95
6000 2.0 100 7.0 95
6300 2.0 100 7.0 95
8000 0.0 90 5.0 90
WhiteNoise 0.0 110
AC40 Service Manual Page 8
ANSI B71
Coupler ANSI S3.13
Tone Audiometer
Tone Narrow Band Noise
ANSI S3.6 -2010 ANSI S3.6 - 2010
Frequency RETSPL MaxHL RETSPL MaxHL
125 - - - -
160 - - - -
200 - - - -
250 67.0 45 71.0 35
315 64.0 50 68.0 40
400 61.0 65 65.0 55
500 58.0 65 62.0 55
630 52.5 70 57.5 60
750 48.5 70 53.5 60
800 47.0 70 52.0 60
1000 42.5 70 48.5 60
1250 39.0 70 45.0 60
1500 36.5 70 42.5 60
1600 35.5 70 41.5 60
2000 31.0 75 37.0 65
2500 29.5 80 35.5 65
3000 30.0 80 36.0 65
3150 31.0 80 37.0 65
4000 35.5 80 40.5 65
5000 40.0 60 45.0 50
6000 40.0 50 45.0 45
6300 40.0 50 45.0 40
8000 40.0 50 45.0 40
WhiteNoise 42.5 70
ANSI DD45
Coupler: IEC 60318-3 1998 (6ccm)
Tone Audiometer
Tone Narrow Band Noise
PTB DTU 2010 ISO 389-4 1994
Frequency RETSPL MaxHL RETSPL MaxHL
125 47.5 90 51.5 75
160 40.5 95 44.5 80
200 33.5 100 37.5 90
250 27.0 110 31.0 95
315 22.5 115 26.5 100
400 17.5 120 21.5 105
500 13.0 120 17.0 110
630 9.0 120 14.0 110
750 6.5 120 11.5 110
800 6.5 120 11.5 110
1000 6.0 120 12.0 110
1250 7.0 120 13.0 110
1500 8.0 120 14.0 110
1600 8.0 120 14.0 110
2000 8.0 120 14.0 110
2500 8.0 120 14.0 110
3000 8.0 120 14.0 110
3150 8.0 120 14.0 110
4000 9.0 120 14.0 110
5000 13.0 120 18.0 110
6000 20.5 115 25.5 105
6300 19.0 115 24.0 105
8000 12.0 110 17.0 100
WhiteNoise 0 120
TEN Noise 25.0 110
This value is interpolated on Interacoustics
IEC B71
Coupler 60318-6 2007
Tone Audiometer
Tone Narrow Band Noise
ISO 389-3 1994 ISO 389-4 1994
Frequency RETSPL MaxHL RETSPL MaxHL
125 - - - -
160 - - - -
200 - - - -
250 67.0 45 71.0 35
315 64.0 50 68.0 40
400 61.0 65 65.0 55
500 58.0 65 62.0 55
630 52.5 70 57.5 60
750 48.5 70 53.5 60
800 47.0 70 52.0 60
1000 42.5 70 48.5 60
1250 39.0 70 45.0 60
1500 36.5 70 42.5 60
1600 35.5 70 41.5 60
2000 31.0 75 37.0 65
2500 29.5 80 35.5 65
3000 30.0 80 36.0 65
3150 31.0 80 37.0 65
4000 35.5 80 40.5 65
5000 40.0 60 45.0 50
6000 40.0 50 45.0 45
6300 40.0 50 45.0 40
8000 40.0 50 45.0 40
WhiteNoise 42.5 70
IEC DD45
Coupler: IEC 60318-3 1998 (6ccm)
Tone Audiometer
Tone Narrow Band Noise
PTB DTU 2010 ISO 389-4 1994
Frequency RETSPL MaxHL RETSPL MaxHL
125 47.5 90 51.5 75
160 40.5 95 44.5 80
200 33.5 100 37.5 90
250 27.0 110 31.0 95
315 22.5 115 26.5 100
400 17.5 120 21.5 105
500 13.0 120 17.0 110
630 9.0 120 14.0 110
750 6.5 120 11.5 110
800 6.5 120 11.5 110
1000 6.0 120 12.0 110
1250 7.0 120 13.0 110
1500 8.0 120 14.0 110
1600 8.0 120 14.0 110
2000 8.0 120 14.0 110
2500 8.0 120 14.0 110
3000 8.0 120 14.0 110
3150 8.0 120 14.0 110
4000 9.0 120 14.0 110
5000 13.0 120 18.0 110
6000 20.5 115 25.5 105
6300 19.0 115 24.0 105
8000 12.0 110 17.0 100
WhiteNoise 0 120
TEN Noise 25.0 110
This value is interpolated on Interacoustics
AC40 Service Manual Page 9
ANSI Free Field
ANSI Free Field
ANSI S3.6-2010 Free Field max SPL
Free Field max HL is found by subtracting the selected RETSPL value
Binaural Monaural Free Field Power Free Field Line
0 45 90 0 45 90 Tone NB Tone NB
Frequency RETSPL RETSPL RETSPL RETSPL RETSPL RETSPL Max SPL Max SPL Max SPL Max SPL
125 22.0 21.5 21.0 24.0 23.5 23.0 97 82 102 97
160 18.0 17.0 16.5 20.0 19.0 18.5 93 83 98 93
200 14.5 13.5 13.0 16.5 15.5 15.0 94.5 84.5 104.5 99.5
250 11.5 10.5 9.5 13.5 12.5 11.5 96.5 86.5 106.5 101.5
315 8.5 7.0 6.0 10.5 9.0 8.0 93.5 83.5 103.5 98.5
400 6.0 3.5 2.5 8.0 5.5 4.5 96 86 106 101
500 4.5 1.5 0.0 6.5 3.5 2.0 94.5 84.5 104.5 99.5
630 3.0 -0.5 -2.0 5.0 1.5 0.0 93 83 103 98
750 2.5 -1.0 -2.5 4.5 1.0 -0.5 92.5 82.5 102.5 97.5
800 2.0 -1.5 -3.0 4.0 0.5 -1.0 92 87 107 102
1000 2.5 -1.5 -3.0 4.5 0.5 -1.0 92.5 82.5 102.5 97.5
1250 3.5 -0.5 -2.5 5.5 1.5 -0.5 93.5 83.5 103.5 98.5
1500 2.5 -1.0 -2.5 4.5 1.0 -0.5 92.5 82.5 102.5 97.5
1600 1.5 -2.0 -3.0 3.5 0.0 -1.0 96.5 86.5 106.5 101.5
2000 -1.5 -4.5 -3.5 0.5 -2.5 -1.5 93.5 83.5 103.5 98.5
2500 -4.0 -7.5 -6.0 -2.0 -5.5 -4.0 91 81 101 96
3000 -6.0 -11.0 -8.5 -4.0 -9.0 -6.5 94 84 104 94
3150 -6.0 -11.0 -8.0 -4.0 -9.0 -6.0 94 84 104 94
4000 -5.5 -9.5 -5.0 -3.5 -7.5 -3.0 94.5 84.5 104.5 99.5
5000 -1.5 -7.5 -5.5 0.5 -5.5 -3.5 93.5 83.5 108.5 98.5
6000 4.5 -3.0 -5.0 6.5 -1.0 -3.0 94.5 84.5 104.5 99.5
6300 6.0 -1.5 -4.0 8.0 0.5 -2.0 96 86 106 96
8000 12.5 7.0 4.0 14.5 9.0 6.0 87.5 72.5 92.5 87.5
WhiteNoise 0.0 0.0 0.0 0.0 0.0 0.0 90 100
IEC Free Field
IEC Free Field
ISO 389-7 2005 Free Field max SPL
Free Field max HL is found by subtracting the selected RETSPL value
Binaural Monaural Free Field Power Free Field Line
0 45 90 0 45 90 Tone NB Tone NB
Frequency RETSPL RETSPL RETSPL RETSPL RETSPL RETSPL Max SPL Max SPL Max SPL Max SPL
125 22.0 21.5 21.0 24.0 23.5 23.0 97 82 102 97
160 18.0 17.0 16.5 20.0 19.0 18.5 93 83 98 93
200 14.5 13.5 13.0 16.5 15.5 15.0 94.5 84.5 104.5 99.5
250 11.5 10.5 9.5 13.5 12.5 11.5 96.5 86.5 106.5 101.5
315 8.5 7.0 6.0 10.5 9.0 8.0 93.5 83.5 103.5 98.5
400 6.0 3.5 2.5 8.0 5.5 4.5 96 86 106 101
500 4.5 1.5 0.0 6.5 3.5 2.0 94.5 84.5 104.5 99.5
630 3.0 -0.5 -2.0 5.0 1.5 0.0 93 83 103 98
750 2.5 -1.0 -2.5 4.5 1.0 -0.5 92.5 82.5 102.5 97.5
800 2.0 -1.5 -3.0 4.0 0.5 -1.0 92 87 107 102
1000 2.5 -1.5 -3.0 4.5 0.5 -1.0 92.5 82.5 102.5 97.5
1250 3.5 -0.5 -2.5 5.5 1.5 -0.5 93.5 83.5 103.5 98.5
1500 2.5 -1.0 -2.5 4.5 1.0 -0.5 92.5 82.5 102.5 97.5
1600 1.5 -2.0 -3.0 3.5 0.0 -1.0 96.5 86.5 106.5 101.5
2000 -1.5 -4.5 -3.5 0.5 -2.5 -1.5 93.5 83.5 103.5 98.5
2500 -4.0 -7.5 -6.0 -2.0 -5.5 -4.0 91 81 101 96
3000 -6.0 -11.0 -8.5 -4.0 -9.0 -6.5 94 84 104 94
3150 -6.0 -11.0 -8.0 -4.0 -9.0 -6.0 94 84 104 94
4000 -5.5 -9.5 -5.0 -3.5 -7.5 -3.0 94.5 84.5 104.5 99.5
5000 -1.5 -7.5 -5.5 0.5 -5.5 -3.5 93.5 83.5 108.5 98.5
6000 4.5 -3.0 -5.0 6.5 -1.0 -3.0 94.5 84.5 104.5 99.5
6300 6.0 -1.5 -4.0 8.0 0.5 -2.0 96 86 106 96
8000 12.5 7.0 4.0 14.5 9.0 6.0 87.5 72.5 92.5 87.5
WhiteNoise 0.0 0.0 0.0 0.0 0.0 0.0 90 100
The 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.
AC40 Service Manual Page 10
Survey of reference and max hearing level Speech Audiometer
ANSI Speech
ANSI TDH39
Coupler: ANSI S3.7-1995 (NBS-9A) / IEC 60318-3 1998 (6ccm)
Speech Audiometer
Speech Speech Noise
ANSI S3.6-2010 ANSI S3.6-2010
RETSPL MaxHL RETSPL MaxHL
Linear Type A 19.5 110 19.5 100
Equ. FF Type A-E 15.5 105 15.5 100
Not Linear 7.0 120 7.0 115
Speech WN 22.0 95
ANSI HDA 280
Coupler: ANSI S3.7-1995 (NBS-9A) / IEC 60318-3 1998 (6ccm)
Speech Audiometer
Speech Speech Noise
RETSPL MaxHL RETSPL MaxHL
Linear Type A 20.0 100 20.0 95
Equ. FF Type A-E 21.5 95 21.5 90
Not Linear 7.5 120 7.5 120
Speech WN 22.5 95
ANSI HDA 200
Coupler: IEC60318-2 with type 1 adaptor
Speech Audiometer
Speech Speech Noise
ANSI S3.6-2010 ANSI S3.6-2010
Frequency RETSPL MaxHL RETSPL MaxHL
Linear Type A 19.0 90 19.0 85
Equ. FF Type A-E 18.5 85 18.5 80
Not Linear 5.5 110 5.5 105
Speech WN 21.5 90
ANSI DD45
Coupler: ANSI S3.7-1995 (NBS-9A) / IEC 60318-3 1998 (6ccm)
Speech Audiometer
Speech Speech Noise
ANSI S3.6-2010 ANSI S3.6-2010
RETSPL MaxHL RETSPL MaxHL
Linear Type A 18.5 110 18.5 100
Equ. FF Type A-E 18.5 100 18.5 100
Not Linear 6.0 120 6.0 115
Speech WN 21.0 95
This value come from pure tone 1kHz RETSPL value. (Not linear describe
there is no equalizing of the signal flat electrical response)
ANSI Ear 3A
Coupler: ANSI S3.7-1995 (HA-2 with 5mm rigid Tube)
Speech Audiometer
Speech Speech Noise
ANSI S3.6-2010 ANSI S3.6-2010
RETSPL MaxHL RETSPL MaxHL
Speech 12.5 110 12.5 100
Speech WN 15.0 95
ANSI Ear 5A
Coupler: IEC 60318-5 2006
Speech Audiometer
Speech Speech Noise
ANSI S3.6-2010 ANSI S3.6-2010
RETSPL MaxHL RETSPL MaxHL
Speech 12.5 110 12.5 100
Speech WN 15.0 95
ANSI CIR 22/CIR33
Coupler: ANSI S3.7-1995 (HA-2)
Speech Audiometer
Speech Speech Noise
ANSI S3.6-2010 ANSI S3.6-2010
RETSPL MaxHL RETSPL MaxHL
Speech 12.5 100 12.5 100
Speech WN 15.0 95
ANSI B71
Coupler: ANSI S3.13-1987 (R2002)
Speech Audiometer
Speech Speech Noise
ANSI S3.6-2010 ANSI S3.6-2010
RETSPL MaxHL RETSPL MaxHL
Speech 55.0 60 55.0 50
Speech WN 57.5 55
ANSI Free Field
ANSI S3.6-2010 Free Field max SPL
Free Field max HL is found by subtracting the
selected RETSPL value
Binaural Monaural Free Field Power Free Field Line
0 45 90 0 45 90 0 - 45 - 90 0 - 45 - 90
RETSPL RETSPL RETSPL RETSPL RETSPL RETSPL Max SPL Max SPL
Speech 15.0 11.0 9.5 17.0 13.0 11.5 90 100
Speech Noise 15.0 11.0 9.5 17.0 13.0 11.5 85 100
Speech WN 17.5 13.5 12.0 19.5 15.5 14.0 87.5 97.5
AC40 Service Manual Page 11
IEC Speech Calibration
IEC TDH39
Coupler IEC 60318-3 1998 (6ccm)
Speech Audiometer
Speech Speech Noise
IEC60645-2 1997 IEC60645-2 1997
RETSPL MaxHL RETSPL MaxHL
Linear Type A 20.0 110 20.0 100
Equ. FF Type A-E 0.5 120 0.5 115
Not Linear 7.0 120 7.0 115
Speech WN 22.5 95
IEC HDA 280
Coupler IEC 60318-3 1998 (6ccm)
Speech Audiometer
Speech Speech Noise
IEC60645-2 1997 IEC60645-2 1997
RETSPL MaxHL RETSPL MaxHL
Linear Type A 20.0 100 20.0 95
Equ. FF Type A-E 6.5 110 6.5 105
Not Linear 7.5 120 7.5 120
Speech WN 22.5 95
IEC HDA 200
Coupler IEC60318-1 with type 1 adaptor
Speech Audiometer
Speech Speech Noise
IEC60645-2 1997 IEC60645-2 1997
Frequency RETSPL MaxHL RETSPL MaxHL
Linear Type A 20.0 90 20.0 85
Equ. FF Type A-E 3.5 100 3.5 95
Not Linear 5.5 110 5.5 105
Speech WN 22.5 90
IEC DD45
Coupler IEC 60318-3 1998 (6ccm)
Speech Audiometer
Speech Speech Noise
IEC60645-2 1997 IEC60645-2 1997
RETSPL MaxHL RETSPL MaxHL
Linear Type A 20.0 110 20.0 100
Equ. FF Type A-E 3.5 115 3.5 115
Not Linear 6.0 120 6.0 115
Speech WN 22.5 95
This value come from pure tone 1kHz RETSPL value. (Not linear describe
there is no equalizing of the signal flat electrical response)
IEC Ear 3A
Coupler IEC 60318-5 2006
Speech Audiometer
Speech Speech Noise
IEC60645-2 1997 IEC60645-2 1997
RETSPL MaxHL RETSPL MaxHL
Speech 20.0 100 20.0 90
Speech WN 22.5 85
IEC Ear 5A
Coupler IEC 60318-5 2006
Speech Audiometer
Speech Speech Noise
IEC60645-2 1997 IEC60645-2 1997
RETSPL MaxHL RETSPL MaxHL
Speech 20.0 100 20.0 90
Speech WN 22.5 85
IEC CIR 22/CIR33
Coupler IEC 60318-5 2006
Speech Audiometer
Speech Speech Noise
IEC60645-2 1997 IEC60645-2 1997
RETSPL MaxHL RETSPL MaxHL
Speech 20.0 90 20.0 90
Speech WN 22.5 85
IEC B71
Coupler 60318-6 2007
Speech Audiometer
Speech Speech Noise
IEC60645-2 1997 IEC60645-2 1997
RETSPL MaxHL RETSPL MaxHL
Speech 55.0 60 55.0 50
Speech WN 57.5 55
IEC Free Field
ISO 389-7 2005 Free Field max SPL
Free Field max HL is found by subtracting the
selected RETSPL value
Binaural Monaural Free Field Power Free Field Line
0 45 90 0 45 90 0 - 45 - 90 0 - 45 - 90
RETSPL RETSPL RETSPL RETSPL RETSPL RETSPL Max SPL Max SPL
Speech 0.0 -4.0 -5.5 2.0 -2.0 -3.5 90 100
Speech Noise 0.0 -4.0 -5.5 2.0 -2.0 -3.5 85 100
Speech WN 2.5 -1.5 -3.0 4.5 0.5 -0.5 87.5 97.5
AC40 Service Manual Page 12
Swedish Speech calibration
SWEDEN TDH39
Coupler IEC 60318-3 1998 (6ccm)
Speech Audiometer
Speech Speech Noise
STAF 1996 STAF 1996
RETSPL MaxHL RETSPL MaxHL
Linear Type A 22.0 108 27.0 93
Equ. FF Type A-E 0.5 120 0.5 115
Not Linear 22.0 105 27.0 95
Speech WN 22.5 95
SWEDEN HDA 280
Coupler IEC 60318-3 1998 (6ccm)
Speech Audiometer
Speech Speech Noise
IEC60645-2 1997 IEC60645-2 1997
RETSPL MaxHL RETSPL MaxHL
Linear Type A 20.0 100 20.0 95
Equ. FF Type A-E 6.5 110 6.5 105
Not Linear 7.5 120 7.5 120
Speech WN 22.5 95
SWEDEN HDA 200
Coupler IEC60318-1 with type 1 adaptor
Speech Audiometer
Speech Speech Noise
IEC60645-2 1997 IEC60645-2 1997
Frequency RETSPL MaxHL RETSPL MaxHL
Linear Type A 20.0 90 20.0 85
Equ. FF Type A-E 3.5 100 3.5 95
Not Linear 5.5 110 5.5 105
Speech WN 22.5 90
SWEDEN DD45
Coupler IEC 60318-3 1998 (6ccm)
Speech Audiometer
Speech Speech Noise
STAF 1996 STAF 1996
RETSPL MaxHL RETSPL MaxHL
Linear Type A 22.0 108 27.0 93
Equ. FF Type A-E 3.5 115 3.5 115
Not Linear 22.0 104 27.0 94
Speech WN 22.5 95
SWEDEN EAR 3A
Coupler IEC 60318-5 2006
Speech Audiometer
Speech Speech Noise
STAF 1996 STAF 1996
RETSPL MaxHL RETSPL MaxHL
Speech 21.0 99 26.0 84
Speech WN 22.5 85
SWEDEN EAR 5A
Coupler IEC 60318-5 2006
Speech Audiometer
Speech Speech Noise
STAF 1996 STAF 1996
RETSPL MaxHL RETSPL MaxHL
Speech 21.0 99 26.0 84
Speech WN 22.5 85
SWEDEN CIR 22/CIR33
Coupler IEC 60318-5 2006
Speech Audiometer
Speech Speech Noise
STAF 1996 STAF 1996
RETSPL MaxHL RETSPL MaxHL
Speech 21.0 89 26.0 84
Speech WN 22.5 85
SWEDEN B71
Coupler 60318-6 2007
Speech Audiometer
Speech Speech Noise
IEC60645-2 1997 IEC60645-2 1997
RETSPL MaxHL RETSPL MaxHL
Speech 55.0 60 55.0 50
Speech WN 57.5 55
Sweden Free Field
ISO 389-7 2005 Free Field max SPL
Free Field max HL is found by subtracting the
selected RETSPL value
Binaural Monaural Free Field Power Free Field Line
0 45 90 0 45 90 0 - 45 - 90 0 - 45 - 90
RETSPL RETSPL RETSPL RETSPL RETSPL RETSPL Max SPL Max SPL
Speech 0.0 -4.0 -5.5 2.0 -2.0 -3.5 90 100
Speech Noise 0.0 -4.0 -5.5 2.0 -2.0 -3.5 85 100
Speech WN 2.5 -1.5 -3.0 4.5 0.5 -0.5 87.5 97.5
AC40 Service Manual Page 13
Norwegian Speech Calibration
Norway TDH39
Coupler IEC 60318-3 1998 (6ccm)
Speech Audiometer
Speech Speech Noise
Norway Norway
RETSPL MaxHL RETSPL MaxHL
Linear Type A 40.0 90 40.0 80
Equ. FF Type A-E 0.5 120 0.5 115
Not Linear 7.0 120 7.0 115
Speech WN 22.5 95
Norway HDA 280
Coupler IEC 60318-3 1998 (6ccm)
Speech Audiometer
Speech Speech Noise
Norway Norway
RETSPL MaxHL RETSPL MaxHL
Linear Type A 40.0 80 40.0 75
Equ. FF Type A-E 6.5 110 6.5 105
Not Linear 7.5 120 7.5 120
Speech WN 22.5 95
Norway HDA 200
Coupler IEC60318-1 with type 1 adaptor
Speech Audiometer
Speech Speech Noise
Norway Norway
Frequency RETSPL MaxHL RETSPL MaxHL
Linear Type A 40.0 70 40.0 65
Equ. FF Type A-E 3.5 100 3.5 95
Not Linear 5.5 110 5.5 105
Speech WN 22.5 90
Norway DD45
Coupler IEC 60318-3 1998 (6ccm)
Speech Audiometer
Speech Speech Noise
Norway Norway
RETSPL MaxHL RETSPL MaxHL
Linear Type A 40.0 90 40.0 80
Equ. FF Type A-E 3.5 115 3.5 115
Not Linear 6.0 120 6.0 115
Speech WN 22.5 95
Norway EAR 3A
Coupler IEC 60318-5 2006
Speech Audiometer
Speech Speech Noise
Norway Norway
RETSPL MaxHL RETSPL MaxHL
Speech 40.0 80 40.0 70
Speech WN 22.5 85
Norway EAR 5A
Coupler IEC 60318-5 2006
Speech Audiometer
Speech Speech Noise
Norway Norway
RETSPL MaxHL RETSPL MaxHL
Speech 40.0 80 40.0 70
Speech WN 22.5 85
Norway CIR 22/CIR33
Coupler IEC 60318-5 2006
Speech Audiometer
Speech Speech Noise
Norway Norway
RETSPL MaxHL RETSPL MaxHL
Speech 40.0 70 40.0 70
Speech WN 22.5 85
Norway B71
Coupler 60318-6 2007
Speech Audiometer
Speech Speech Noise
Norway Norway
RETSPL MaxHL RETSPL MaxHL
Speech 75.0 40 75.0 30
Speech WN 57.5 55
Norway Free Field
ISO 389-7 2005 Free Field max SPL
Free Field max HL is found by subtracting the
selected RETSPL value
Binaural Monaural Free Field Power Free Field Line
0 45 90 0 45 90 0 - 45 - 90 0 - 45 - 90
RETSPL RETSPL RETSPL RETSPL RETSPL RETSPL Max SPL Max SPL
Speech 0.0 -4.0 -5.5 2.0 -2.0 -3.5 90 100
Speech Noise 0.0 -4.0 -5.5 2.0 -2.0 -3.5 85 100
Speech WN 2.5 -1.5 -3.0 4.5 0.5 -0.5 87.5 97.5
AC40 Service Manual Page 14
Equivalent free field
Equivalent Free Field
Speech Audiometer
TDH39 HDA200 HDA280 DD45
IEC60645-2 1997
ANSI S3.6-2010
ISO389-8 2004 PTB
PTB DTU
IEC60318-3 1998 IEC60318-1 IEC60318-3 1998 2010
Frequency GF-GC GF-GC GF-GC GF-GC
125 -17,5 -5,0 -15,0 -21.5
160 -14,5 -4,5 -14,0 -17.5
200 -12,0 -4,5 -12,5 -14.5
250 -9,5 -4,5 -11,5 -12.0
315 -6,5 -5,0 -10,0 -9.5
400 -3,5 -5,5 -9,0 -7.0
500 -5,0 -2,5 -8,0 -7.0
630 0,0 -2,5 -8,5 -6.5
750 -5,0
800 -0,5 -3,0 -4,5 -4.0
1000 -0,5 -3,5 -6,5 -3.5
1250 -1,0 -2,0 -11,5 -3.5
1500 -12,5
1600 -4,0 -5,5 -12,5 -7.0
2000 -6,0 -5,0 -9,5 -7.0
2500 -7,0 -6,0 -7 -9.5
3000 -10,5
3150 -10,5 -7,0 -10,0 -12.0
4000 -10,5 -13,0 -14,5 -8.0
5000 -11,0 -14,5 -12,5 -8.5
6000 -14,5
6300 -10,5 -11,0 -15,5 -9.0
8000 +1,5 -8,5 -9,0 -1.5
General properties for earphones
Sound attenuation values for earphones
Frequenc
y
Attenuation
TDH39/DD45 with MX41/
AR or PN 51 cushion
EAR-Tone 3A
EAR-Tone 5A
HDA200
[Hz] [dB] [dB] [dB]
125 3 33,5 14,5
160 4
200 5
250 5 34,5 16
315 5
400 6
500 7 34,5 22,5
630 9
750 -
800 11
1000 15 35,0 28,5
1250 18
1500 -
1600 21
2000 26 33,0 32
2500 28
3000 -
3150 31
4000 32 39,5 45,5
5000 29
6000 -
6300 26
8000 24 43,5 44
AC40 Service Manual Page 15
Calibration properties
Calibrated Transducers: Earphones: Telephonics TDH39 with a static force of 4.5N 0.5N
Interacoustics DD45 with a static force of 4.5N 0.5N
Sennheiser HDA200 with a static force of 10N1.0N
Sennheiser HDA280 with a static force of 4.5N 0.5N
Bone conductor: Radioear B71 with a static force of 5.4N 0.5N
Insert phones: EAR Tone 3A (Option)
EAR Tone 5A (Option)
Accuracies: Generally the instrument is made and calibrated to be within and better than the tolerances required
in the specified audiometer standards:
Frequency: 0.1%
Pure tone levels: 3 dB for 125 4000Hz
5 dB for 6000 8000Hz
Speech frequency response : -0/-10 dB at 125 249 Hz
3 dB at 250 4000 Hz
5 dB at 4001 6300 Hz
Tone calibration standards and spectral properties:
Earphones Pure tone: Mean value of PTB report 1.61-4039503/09 and DTU report 27
October 2009 for DD45
ISO 389-1 1998 / ANSI S3.6-2010 for TDH39.
Narrow band noise: Pure Tone + ISO 389-4 1994 values / ANSI S3.6-2010
Spectral properties: IEC 60645-1 2012/ / ANSI S3.6-2010, Narrow band noise
White noise: SPL
Spectral properties: IEC 60645-1 2012, White noise
Bone conductor Pure tone: ISO 389-3 1994 / ANSI S3.6.- 2010 Valid for placement on the human
mastoid
Insert phones Pure tone: ISO 389-2 1994/ ANSI S3.6-2010
Narrow band noise: ISO 389-2 1994 + ISO 389-4 1994 values / ANSI S3.6-2010
Spectral properties: IEC 60645-1 2012, ANSI S3.6-2010 Narrow band noise, electrically
measured.
White noise: SPL
Spectral properties: IEC 60645-1 2012, White noise, electrically measured.
Free field output (calibrated
on location)
Pure tone: ISO 389-7 2005 + ISO8253-2 1992/ ANSI S3.6-2010 Free field
Narrow Band noise: ISO 389-7 2005 + ISO8253-2 1992/ ANSI S3.6-2010
Spectral properties: IEC 60645-1 2012 / ANSI S3.6-2010, Narrow band noise
White noise: SPL
Spectral properties: IEC 60645-1 2012, White noise 80-20000Hz measured with constant
bandwidth
80-20000Hz measured with 1/3 octave filtering
AC40 Service Manual Page 16
Accessories and Parts
Accessories
Item # IA Item Number Description
8010879
8010819
DD45 Audiometric headset/
TDH 39 Audiometric headset (Optional)
8010876 DD45 telephone 10 ohm
8010625 TDH39P 10 Ohm Earphone Telephonics
8010817 HBA Audiometric head band
For DD45/TDH39 headsets
8010894 DD51 cushion
For DD45/TDH39 headsets
8010822 Earphone cable IEC-M21 symmetric mono
For DD45/TDH39 headsets
8010815Eartone 3A 10 Ohm Insert Earphones
8000713Replacement cable
Earphone 3A 10ohm
AC40 Service Manual Page 17
8010797 EARtone 5A Insert Earphones including
4 large 3C, 10 small 3B and 50 medium 3A Ear
tips
8010893 HDA200 Headset 30 plugs
8010796
8010901
TDH39AA Audiometric Headset with
Amplivox Audiocups
DD45AA Audiometric Headset with
Amplivox Audiocups
8010794
8010953
TDH39 Audiometric Headset
DD45 Audiometric headset
8010872 Headset HDA280 complete
8010870 Monitor Headset with boom PC-131 stereo
headset
8010800 B71 Bone Conductor
30 plug
8011094 IEC-B11 Conductor cable
8011096 B71 Bone Conductor
8011098 P3333 Headband for B71
8001705 Accessory box
For B71 Bone conductor
AC40 Service Manual Page 18
8010937 CIR33 Insert earphone kit
8011091 APS3 Patient response switch
8013227 Optical USB 1.1 isolation MED
8006480 Gooseneck 1059
8011241 Cable USB 2m
8011273 Cable TCC connection
Minijack to minijack for external CD player
8011237 Mainscable E/F
8011391
up to8011397
8011402
8011406
Mains cables Country specific
Mains cable Brazil
Mains cable Japan
8012959 Cleaning cloth
AC40 Service Manual Page 19
Consumables and Parts
Consumables
Item # IA Item Number Description
8011371 Pen set and AF12 audiogram chart kit
Parts
Item # IA Item Number Description
PCA Main board 1060
For exchange contact Interacoustics
PCA Key board 1060
For exchange contact Interacoustics
8006375 PCA Back Board 1060
8006376 PCA Side Board 1060
8006284 PCA Encoder PCB 1058/1059/...
8009262 Connection PCB 2062
8100308 Micro Secure Digital Card
4GB microSD MLC
8010604 Display LCD 170.4x127.8 color TFY-LCD
8001604 Glass cover display 1060
Display cable
For exchange contact Interacoustics
8004158 Ribbon cable 380mm 40pins pitch 0.5mm FFC
AC40 Service Manual Page 20
8006060 Power Supply 200W order with cable below
8004427 Cable power supply 2062/1060
8003518 Cable tie 92x2.4mm black
For power cable
8010686 Speaker 4ohm with wire and plug
For exchange contact Interacoustics
8002686 Cover Display 1060
8002608 Cover Front 1060
8002521 Button rotary 1059
8102492 Cover upper 1059/1060
8001567 Impeller rotary button 1059
8003677 Bearing 17x30x2
AC40 Service Manual Page 21
Schematics
Block Diagram
TDM
codec
Output Att .
+20-100 dB
Fix Att.
0-25 dB
Ext .
Ranges
+20 dBTDH39
TDH 50
DD 45Input
switch
Ch1
Input Att .
+30-100 dB
Input Att .
+30-100 dB
Talk Forward
Mic 1 Int
Mic 2
CD 1
CD 2
EAR 3A
EAR 5A
Bone
1
Stereo
Monitor
Headset
Output DAC Ch 1 Fix Att. Ch1
Output Sw Ch 1
Output Sw Ch 2
Output Sw Ch 3
Input DAC Ch 2
Input DAC Ch 1
Input Sw Ch 1
Input Sw Ch 2
Output
switch
Ch1
Output
switch
Ch2
Output
switch
Ch3
Output
switch
Ch4
Input
switch
Ch2
2*Mono
2*Mono
Phone
Insert
TDM Serial
SD
card
Socket
SPI
Flash
Reset
DSP
FlashDDR
Ram
USB Device
Pat. R.
2
USB Host
SP
I
IRQ
CP
U
IRQ
DS
P
Pat . R.
1
B71
Author
Current revision
File Location
AC40 BlockDiagram
AC40 block diagram
Document Name
Project Name
Revision date
Ib Pedersen
2.0
08-06-2012
D-0100718
Input Ch 1-2
select
Fix Att. Ch1-2
code
Output Ch 1-2
code
Input Ch 3-4
Select
Mute Ch 1-2
FF1-2 Line
Fix Att Ch3-4
Code
Output Ch 3-4
Code
Mute Ch 3-4
FF3-4 Line
SPI DAC 1
DSP
SPI
CS
FLag 20FLag 21
FLag 22
SPI Row 1
SPI Row 0
SPI Row 2
SPI Codec
Stereo
Assistent
Headset
Phone - HF
HDA200
2*Mono
+20dB Ch 1
Output Sw Ch 4
8
channel
DAC
Att. Ch1 Output DAC
Att. Ch2 Output DAC
Att. Ch4 Output DAC
Att. Ch3 Output DAC
Att. Ch1 Intput DAC
Att . Ch2 Intput DAC
Att . Ch3 Intput DAC
SPI Keyboard
matrix /
encoders
Display
600*800
SPI
Key Led ctrl
Keyboard
Ext. Keyboard
Ext . Mouse
Laptop -PC
HUB
USB Host 1
USB Host 4
CPU
SPI
CS
SD
RAMFLag 20
FLag 21
FLag 22
Real
time
clock
Input
110-240V
Power supply
Talk Forward
Mic 1 Ext
FF 1
Power
HDMI
Att . Ch4 Intput DAC
CD
Monitor
LSP 1
Left
Right
Phone 2 L
Phone HF R
Phone 1 R
Phone - HF L
Insert L
Insert R
Insert / HF
Phone 1/2
Insert / HF
FF1
20W
FF1
LineFF1 Line
FF 2
Power
FF2
20W
FF2
Line
FF2 Line
FF2 P
FF1-2 FF1 P
Talk Back Mic
Monitor Ch1
Monitor Ch2
Output Ch 1
Output Ch 2
Output Ch 3
Output Ch 4
Input Ch 1
Input Ch 2
Input Ch 3
Input Ch 4
Output Ch 5
Output Ch 6
Input
switch
Ch3
Input Att .
+30-100 dB
Input DAC Ch 3
Input Sw Ch 3
Input
switch
Ch4
Input Att .
+30-100 dB
Input DAC Ch 4
Input Sw Ch 4
Mute
Mute Ch 1
Output Att .
+20-100 dB
Fix Att.
0-25 dB
Ext .
Ranges
+20 dB
Output DAC Ch 2 Fix Att. Ch2 +20dB Ch 2
Mute
Mute Ch 2
Output Att .
+20-100 dB
Fix Att.
0-25 dB
Ext .
Ranges
+20 dB
Output DAC Ch 3 Fix Att. Ch3 +20dB Ch 3
Mute
Mute Ch 3
Output Att .
+20-100 dB
Fix Att.
0-25 dB
Ext .
Ranges
+20 dB
Output DAC Ch 4 Fix Att. Ch4 +20dB Ch 4
Mute
Mute Ch 4
FF 3
Power
FF3
20W
FF3
Line
FF3 Line
FF 4
Power
FF4
20W
FF4
Line
FF4 Line
FF4 P
FF3-4 FF3 P
Bone
2B71
Bone
1
Bone
2
Insert
Masking
Ins
M
Phone 1 L
Phone 2 R
Phone 1/2
+
+
Master
Volume
Master
VolumeInput Ch 4
Input Ch 4
Input Ch 3Input Ch 2
Input Ch 1
Input Ch 4
Input Ch 4Input Ch 4
+
+
Monitor
LSP 2
Reset
Mon Input FF3-4 PwrMon Ass
Ch1/Ch2
SPI Codec
Option
off
LAN
Unik
ID
HDMI
CPU
CPU SPI in
LVDS
Ext. Power
FF. Control
Ext. FF0.5A
Ext . FF Ctrl
5V
AC40 Service Manual Page 22
Disassembly
Open the Cabinet
All screws used are Torx
To open the cabinet remove - in total 20 pcs. of 3x8mm screws and 2 pcs. of 3x16mm screws
After removing the screws the top and bottom part can be divided
4
pcs
4
pcs
4
pcs
6
pcs
2
pcs
2
pcs
AC40 Service Manual Page 23
Remove the PCA Back Board and Side Board
Remove boards be mean of M3x5mm screws. Notice not to unscrew the spacer nuts.
Disconnect the connection cables when assembling be aware to lock the cables. Disconnect the USB cables from
the Side Board
5
pcs.
4 pcs
Cable lock
AC40 Service Manual Page 24
Remove the Power Supply
Remove 4x M3x5 screws from the cabinet bottom
Remove the cable tiess and disconnect the connection cable
Disconnect power and ground cable
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AC40 Service Manual Page 25
Remove the Display
Remove the display cover by means of 6 pcs. 2.5x8mm screws on the rear side. The display cover can be romoved
Remove the display glass and the display gasket
Remove 4xM3x5mm screws disconnect the display cable
For change of the display cable contact Interacoustics
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AC40 Service Manual Page 26
Adjusting the knobs after reassembly
Before the covers are mounted check the functionality of the knobs
Turn the knob both clockwise and anti-clockwise.
While turning the knob, notice the little square on the screen (see detail picture). The square should ONLY move
after each full click/when it feels like the knob clicks.
Continue with this test, if the square moves before the knob completes one full click.
Hold on to the knob and loosen the nut a little bit. Hold on to the knob and carefully tighten the
encoder, as shown. Tighten clockwise
AC40 Service Manual Page 27
Hold on to the knob and fasten the nut.
Check if the other knob has to be adjusted
Press the Mask on/off button, to activate it. Turn knob clockwise and anti-clockwise.
If the knob has to be adjusted, use same procedure as described.
Turn the knob clockwise and anti-clockwise, to see if the knob is correctly adjusted. If not, adjust it again!
Remember! The square should ONLY move after each full click/when it feels like the knob clicks .
Continue with this test, if the square moves before the knob completes one full click.
AC40 Service Manual Page 28
Calibration Procedure
Service, adjustment and repair
Annual calibration (ANSI/ASA S3.6)
The calibration procedure will validate all relevant performance requirements given in ANSI/ASA S3.6. After the
audiometric equipment has been submitted for calibration, a calibration certificate showing the values recorded
must be filled out, signed and dated by the technician, demonstrating that the instrument conforms to all relevant
requirements given in this standard.
NOTE It is considered good practice to perform annual checks of the audiometric test rooms noise level as part of annual
calibration using the applicable table per ANSI/ASA S3.1 American National Standard Maximum Permissible Ambient Noise
Levels for Audiometric Test Rooms to ensure that audiometer performance will not be affected by any changes in the
audiometric test rooms noise levels.
Annual calibration (IEC 60645-1)
A basic calibration shall be performed by a competent laboratory. The procedure shall be such that, after the
audiometric equipment has been submitted for a basic calibration, it shall meet the relevant requirements given in
IEC 60645-1.
When the instrument is returned after basic calibration, it should be checked in accordance with procedures
outlined in 12.3 or 12.4 before being put back into service.
It is recommended that a calibration check label be attached to the equipment, giving the date on which the next
calibration is due.
Equipment needed to perform audiometer calibrations
Type 1 sound level meter Octave band filter set (1/3 octave, range of minimum 125 Hz to 16000 Hz) 1.
must meet Type 1 sound level meter (ANSI S1.4). Sound level meters to be checked before use with a
calibrator.
Mechanical Coupler (used for bone conduction calibration) B&K 4930 Artificial Mastoid or other 2.
mechanical coupler. Must meet ANSI S3.13.
System to measure:3.
Frequency
Rise time
Fall time
Duration
Over shoot
THD (Total Harmonic Distortion)
Piston phone or sound level meter calibrator.4.
Ear Simulator ANSI/ASA S3.7 or IEC 60318-1, Part 1: Electroacoustics - Simulators of human head
and ear - Part 1: Ear simulator for the measurement of supra-aural and circumaural earphones
Acoustic Coupler NBS9A (6cc) ANSI/ASA S3.7, or IEC 60318-3, Part 3: Electroacoustics
Simulators of human head and ear Part 3: Acoustic coupler for the calibration of supra-aural
earphones used in audiometry.
IEC 60318-5, Electroacoustics Simulators of human head and ear Part 5: 2 cm3 coupler for the
measurement of hearing aids and earphones coupled to the ear by means of ear inserts
IEC 60318-6, Electroacoustics Simulators of human head and ear Part 6: Mechanical coupler
for the measurement of bone vibrators
Specification / calibration information for all microphones, filters, SLM, and couplers showing correction 5.
values needed to be applied to maintain accuracy.
Other couplers and adapters as stated or specified by manufacturer of the audiometer.6.
Calibration reports/sheets that demonstrate the audiometer meets the requirements and records the 7.
measurement results of the calibration.
AC40 Service Manual Page 29
Phasing of headphones
Before headphone calibration of DD45/TDH39 take place the phase of the speakers must be checked.
Phasing of the Headset
Start the audiometer in user mode1.
Select Left ,Tone, Rev. 125 Hz 70dBHL in channel 1.2.
Connect channel 1 of an oscilloscope to the socket on the left headphone ( set the trigger to 3.
channel 1).
Connect the Left earphone to Left output on the Audiometer and place it on the artificial ear, which 4.
again is connected to a sound level meter.
The sound level meter must be in the range 110 to 115dB.5.
Connect the channel 2 on the oscilloscope to the output of the sound level meter.6.
The oscilloscope must display both channels.7.
Looking at the oscilloscope, notice the phase difference between channel 1 and channel 2.8.
Exchange the Left earphone plug with the Right earphone plug. Replace Left earphone with Right 9.
earphone on the artificial ear
Connect channel 1 of the oscilloscope to the socket on the right speaker.10.
Looking at the oscilloscope, notice if the phase difference between channel 1 and channel 2 is the 11.
same as it was in point 8
If the phase difference is identical the headset is correct connected.12.
If not identical, the plug on the headphone must be turned 180 degrees. Make a new control to be 13.
sure that the oscilloscope picture is the same for point 8 and 11.
Calibration of test equipment
All test equipment used for the calibration of audiometers is to be calibrated annually. Calibration of all test
equipment is to be performed by a laboratory which is traceable to the National Institute of Standards and
Technology (NIST) or equivalent. Test equipment calibration documents are to be kept on file.
Calibration Mode Entering
The calibration program is activated by selecting:
Windows XP: C:\Program Files\Interacoustics\Diagnostic Suite\Calibration AD629AC40.exe
Windows 7: C\program files(X86)\Interacoustics\Diagnostic Suite\ Calibration AD629AC40.exe Follow the
instructions on the screen.
AC40 Service Manual Page 30
Checklist for calibration
Functional checks A /NA Pass/Fail
Visual inspection, safety - Check power cord and accessory cords for
signs of wear or damage and general physical condition of
instrument.
Headband Tension.
Cushions - Check condition; replace if needed.
Patch cords - Check plugs and leads for intermittency.
Patient response - Check for proper operation.
Pure-tone electroacoustic measurements
Frequency (Hz) - Actual measurement recorded (all frequencies).
Distortion (%) - Recorded as a percentage of THD on all frequencies.
Output levels (all transducers) - Recorded as a deviation from
standard
Linearity of all channels (all transducers) (dB) - Recorded as a
deviation from standard.
Rise/fall time (m/sec) - Actual measurement recorded.
Overshoot (dB) - Actual measurement recorded.
On/off ratio - Measured and recorded in dB down.
Crosstalk - Measured and recorded in dB down.
Pulse tones - Duration (m/sec) - Actual measurement recorded
(pass/fail).
SISI - Indicate pass or fail and deviation from standard.
Unwanted noise check - Record with (pass/fail):
Interrupter switch
Switch sounds
Mechanical sounds
Masking measurements
Narrow band noise output level - Measured and recorded as deviation
from standard, all transducers.
White noise output level - Measured and recorded as deviation from
standard, all transducers.
Speech electroacoustic measurements
Speech output level - Signal applied to input, VU meter at zero -
Measured and recorded as deviation from standard, all transducers.
Speech through external inputs - CD / tape / phono - VU meter at
zero - Measured and recorded as deviation from standard all
transducers.
Distortion - Recorded as percentage of THD.
Speech noise - Output measured and recorded as deviation from
standard.
Sound field measurements
Warble/FM output level - Actual measurement recorded (all
frequencies) as deviation from standard.
Speech inputs in sound field output level - Signal applied to input, VU
meter set at zero Measured and recorded as deviation from
standard.
Narrow band noise output level - Measured and recorded as deviation
from standard, all transducers.
Speech/white noise output level - Measured and recorded as
deviation from standard, all transducers.
Distortion - Recorded as percentage of THD.
Operation of instrument should be checked for normal function post calibration.
AC40 Service Manual Page 31
Calibration standard for Audiometer
Select Standard to select standard, options IEC or ANSI
Select Calibration method, to select the calibration method, options SPL mode or HL mode
SPL mode: The tab marked standard is default set to SPL (sound pressure level) so you dont have to
take the standard for the transducer you are calibrating into account. For correction of your 6cc or 2cc
coupler/microphone you have to add or subtract from the 90dB SPL level which can be read on your sound
level meter
HL mode: If you select HL (hearing level) you can perform the calibration like on a regular audiometer
where you add the standard to the HL values and then the corrections for your coupler/microphone.
Figure 1
AC40 Service Manual Page 32
Selecting TDH39 headset
Select Transducer Setup (Figure 2)
Select Headset phone to select TDH39 headset
Enter the serial numbers for the left and right phones in the field Left and Right
Figure 2
Calibration of TDH39
Equipment needed for TDH39 calibration:
Measuring amplifier
Acoustical IEC 60318-3 (IEC 303) coupler
Frequency counter
Correction values for coupler
AC40 Service Manual Page 33
Select Transducer Calibration
Place the transducer on the 6cc IEC 60318-3 (IEC 303) coupler (Figure 3)
Figure 3
Adjust the Adjustment slider until the calibration level is obtained on the measurement amplifier
(i.e. 90 dB SPL) (Figure 4)
Figure 4
Note: Remember to add or subtract the correction for your microphone
Check the frequency accuracy with a frequency counter. The accuracy has to be better than 1%
Press Next, when the calibration level is obtained, to get the next frequency
AC40 Service Manual Page 34
Repeat Next until all stimuli is calibrated, for both left and right transducer.
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Write the calibration to Hardware
Select the Main menu (Figure 5)
Select Write to hardware
A dialog box will appear with the message Calibration data successfully written to hardware
Figure 5
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Selecting DD45 headset
Select Transducer Setup (Figure 6)
Select Headset phone to select DD45 headset
Enter the serial numbers for the left and right phones in the field Left and Right
Figure 6
Calibration of DD45
Equipment needed for DD45 calibration:
Measuring amplifier
Acoustical IEC 60318-3 (IEC 303) coupler
Frequency counter
Correction values for coupler
AC40 Service Manual Page 37
Select Transducer Calibration
Place the transducer on the 6cc IEC 60318-3 (IEC 303) coupler (Figure 7)
Adjust the Adjustment slider until the calibration level is obtained on the measurement amplifier
(i.e. 90 dB SPL) (Figure 8)
Figure 8
Note: Remember to add or subtract the correction for your microphone
Check the frequency accuracy with a frequency counter. The accuracy has to be better than 1%
Press Next, when the calibration level is obtained, to get the next frequency
Repeat Next until all stimuli is calibrated, for both left and right transducer.
Figure 7
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Write the calibration to Hardware
Select the Main menu (Figure 9)
Select Write to hardware
A dialog box will appear with the message Calibration data successfully written to hardware
Figure 9
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Selecting HDA200 headset
Select Transducer Setup (Figure 10)
Select Headset phone and select HDA200 headset
Enter the serial numbers for the left and right phones in the field Left and Right
Figure 10
Calibration of HDA200
Equipment needed for the HDA200 calibrating
Measuring amplifier
Acoustical IEC 60318-1 coupler
Frequency counter
Correction values for coupler
Spacer for HDA200 to coupler IEC 60318-1
AC40 Service Manual Page 40
Select Transducer Calibration
Place the transducer on the IEC 60318-1 coupler (Figure 11)
Figure 11
Adjust the Adjustment slider until the calibration level is obtained on the measurement amplifier
(i.e. 80 dB SPL) (Figure 12)
Figure 12
Note: Remember to add or subtract the correction for your microphone
Check the frequency accuracy with a frequency counter. The accuracy has to be better than 1%
AC40 Service Manual Page 41
Press Next, when the Calibration level is obtained, to get the next frequency
Repeat Next until all stimuli is calibrated, for both left and right transducer.
AC40 Service Manual Page 42
Write the calibration to Hardware
Select the Main menu (Figure 13)
Select the Write to hardware
A dialog box will appear with the message Calibration data successful written to hardware
Figure 13
AC40 Service Manual Page 43
Selecting HDA280 headset
Select the Transducer Setup (Figure 14)
Select Headset phone and select HDA280 headset
Enter the serial numbers for the left and right phone in the field Left and Right
Figure 14
Calibration of HDA280
Equipment needed for the HDA280 calibration:
Measuring amplifier
Acoustical IEC IEC 60318-3 (IEC 303) coupler
Frequency counter
Correction values for coupler
Spacer for HDA280 to coupler IEC 60318-3 (IEC 303)
30 adaptor cable
AC40 Service Manual Page 44
Select Transducer calibration
Place the transducer on the 6cc IEC 60318-3 (IEC 303) coupler (Figure 15)
Figure 15
Adjust the Adjustment slider until the calibration level is obtained on the measurement amplifier
(i.e. 90 dB SPL) (Figure 16)
Figure 16
Note: Remember to add or subtract the correction for your microphone
Check the frequency accuracy with a frequency counter. The Press Next, when the calibration level is
obtained, to get the next frequency Repeat Next until all stimuli is calibrated, for both left and right
AC40 Service Manual Page 45
transducer.
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Write the calibration to Hardware
Select the Main menu (Figure 17)
Select Write to hardware
A dialog box will appear with the message Calibration data successfully written to hardware
Figure 17
AC40 Service Manual Page 47
Selecting EAR3A Insert phone
Select Transducer Setup (Figure 18)
Select Insert phone and select EAR3A
Enter the serial numbers for the left and right phones in the field Left and Right
Figure 18
Calibration of EAR3A
Equipment needed for calibration of EAR3A:
Measuring amplifier
Acoustical IEC 60318-5 (IEC126) coupler
Frequency counter
Correction values for coupler
30 adaptor cable
AC40 Service Manual Page 48
Select Transducer calibration
Place the transducer on the 2cc 60318-5 (IEC126) coupler (Figure 19)
Figure 19
Adjust the Adjustment slider until the calibration level is obtained on the measurement amplifier
(i.e. 90 dB SPL) (Figure 20)
Figure 20
Note: Remember to add or subtract the correction for your microphone
Check the frequency accuracy with a frequency counter. The accuracy has to be better than 1%
AC40 Service Manual Page 49
Press Next, when the calibration level is obtained, to get the next frequency
Repeat Next until all stimuli is calibrated, for both left and right transducer.
Write the calibration to Hardware
Select the Main menu (Figure 21)
Select Write to hardware
A dialog box will appear with the message Calibration data successfully written to hardware
Figure 21
AC40 Service Manual Page 50
Selecting EAR5A Insert phone
Select Transducer Setup (Figure 22)
Select Insert phone and select EAR5A
Enter the serial numbers for the left and right phones in the field Left and Right
Figure 22
Calibration of EAR5A
Equipment needed for calibrating the EAR5A:
Measuring amplifier
Acoustical IEC 60318-5 (IEC126) coupler
Frequency counter
Correction values for coupler
30 adaptor cable
AC40 Service Manual Page 51
Select the Transducer Calibration
Place the transducer on the 2cc IEC 60318-5 (IEC126) coupler (Figure 23)
Figure 23
Adjust the Adjustment slider until the calibration level is obtained on the measurement amplifier
(i.e. 90 dB SPL) (Figure 24)
Figure 24
Note: Remember to add or subtract the correction for your microphone
Check the frequency accuracy with a frequency counter. The accuracy has to better than 1%
AC40 Service Manual Page 52
Press Next, when the calibration level is obtained, to get the next frequency
Repeat Next until all stimuli is calibrated, for both left and right transducer.
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Write the calibration to Hardware
Select the Main menu (Figure 25)
Select Write to hardware
A dialog box will appear with the message Calibration data successfully written to hardware
Figure 25
AC40 Service Manual Page 54
Selecting CIR22/CIR33 Insert masking transducer
Select Transducer Setup (Figure 26)
Select Insert masking transducer and select CIR22/CIR33
Figure 26
Calibration of CIR22/CIR33
Equipment needed for calibrating the CIR22/CIR33:
Measuring amplifier
Acoustical IEC 60318-5 (IEC126) coupler, fitted with Eartip 10
Frequency counter
Correction values for coupler
AC40 Service Manual Page 55
Select Transducer calibration
Place the transducer on the 2cc IEC60318-5 (IEC126)coupler (Figure 27)
Figure 27
Adjust the Adjustment slider until the calibration level is obtained on the measurement amplifier
(i.e. 90 dB SPL) (Figure 28)
Figure 28
Note: Remember to add or subtract the correction for your microphone
Check the frequency accuracy with a frequency counter. The accuracy has to be better than 1%
Press Next, when the calibration level is obtained, to get the next frequency
Repeat Next until all stimuli is calibrated.
AC40 Service Manual Page 56
Write the calibration to Hardware
Select the Main menu (Figure 29)
Select Write to hardware
A dialog box will appear with the message Calibration data successfully written to hardware
Figure 29
AC40 Service Manual Page 57
Selecting B71 Bone transducer
Select Transducer Setup (Figure 30)
Select Bone conductor or Bone conductor 2 and select B71
Figure 30
Calibration of B71
Equipment needed for calibrating the B71:
Measuring amplifier
Artificial Mastoid IEC 60318-6
Frequency counter
Correction values for Mastoid
AC40 Service Manual Page 58
Select Transducer Calibration
Place the transducer on the artificial mastoid. (Figure 31)
Figure 31
Adjust the Adjustment slider until the calibration level is obtained on the measurement amplifier
(i.e. 80 dB SPL) (Figure 32)
Figure 32
Note: Remember to add or subtract the correction for your Mastoid
Check the frequency accuracy with a frequency counter. The accuracy has to be better than 1%
Press Next, when the calibration level is obtained, to get the next frequency
Repeat Next until all stimuli is calibrated.
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Write the calibration to Hardware
Select the Main menu (Figure 33)
Select Write to hardware
A dialog box will appear with the message Calibration data successfully written to hardware
Figure 33
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Calibration procedure Free Field and Custom Max
Select standard: ANSI / IEC (Figure 34)
Figure 34
AC40 Service Manual Page 61
Select Free field setup
Free Field Setup.
Speaker output.
Figure 35
AC40 Service Manual Page 62
Custom max.
If the speakers / amplifier setup is not powerful enough to stimulate with the predefined maximum output, the
maximum output can be decreased to fit the current configuration.
To use custom max, follow instructions on screen or below, read carefully before start. (Figure 36)
When custom max is not used the check mark (use custom max. values) has to be unchecked.
Figure 36
Select speaker.(Figure 37)
Select frequencies
Adjust slider until speaker is distorting or the slider is at the highest.1.
Notices max output level on the Sound level meter (SLM).2.
Type value from the SLM.3.
Select next freq.
Figure 37
2
1
3
AC40 Service Manual Page 63
AC40 Service Manual Page 64
Transducer calibration
Calibrate left and right speaker.
Figure 38
AC40 Service Manual Page 65
Update procedure - Firmware
New firmware will be available on the Interacoustics web site and the firmware is packaged in a zip archive.
After archiving the firmware follow the instructions below.
Unzip the firmware archive on a new FAT32 formatted USB stick.1.
Insert the USB in the unpowered AC40 instrument. 2.
Turn on the instrument and wait for the Tone test.3.
Enter Common Setting using the Setup/Tests Button.4.
Press the function key named Install, and follow the instructions on the instrument display. 5.
Wait for the instrument to return to the Tone test.6.
WARNING: The instrument will restart several times.
WARNING: Dont turn off the instrument while updating.
Installing MHA (Master Hearing Aid) wave files:
MHA/HIS wave files can be installed the following way:
Zip the selected wave files into a file named update_mha.mywavefiles.bin (make sure the file extension is 1.
bin and not zip)
Copy the files to a newly FAT32 formated USB memory stick2.
Insert the stick into one of the USB connections on the AC40.3.
Go to Common Setup and press Install4.
Wait for the installation to complete.5.
Restart the AC40.6.
AC40 Stand Alone Unit, Print Logo Update
AC40 direct printout allows results to be printed directly after testing (via a supported USB printer please contact
Interacoustics customer service for a list of supported PC printers if in doubt). The printout logo can be configured
via the audiometer itself (see below) or via the Diagnostic Suite (in the General Setup a logo impage can be
downloaded to the instrument from the PC).
Open up the Paint program1.
Open up Image Properties, by pushing the Ctrl + E keys2.
Set the Width to 945 and the Height to 190 as shown. Click on OK3.
Edit the Image and the Company data to fit inside the set area4.
Save the created file as PrintLogo.bmp5.
Zip the PrintLogo.bmp file to the following name update_user.logo.bin6.
The update_user.logo.bin file is now ready to be used
Find a USB thumb drive with at least 32MB in total size and insert it into your PC7.
Go to My Computer and right click on the USB thumb drive and select Format **Note-this will erase 8.
AC40 Service Manual Page 66
everything on your USB thumb drive*
Ensure that FAT32 is selected as your File System- Leave other settings as listed9.
Click Start-depending on the size of your thumb drive these may take a while. When the format is complete 10.
you will receive a pop-up indicating it has formatted successfully
Copy update_user.logo.bin file onto the formatted thumbdrive11.
It is very important that this file and only this file is present on the USB thumb drive12.
With the audiometer turned off insert the thumb drive into any available USB port13.
Turn on the instrument and push the Temp/Setup Button from the Tone test screen14.
Enter Common Settings using the Setup/Tests Button15.
For the question Do you want to install press the Yes button16.
After installation is completed, press the Back button to get to the testing screen17.
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AC40 Service Manual Appendix A Page 1
Appendix A Update News
Following modifications are made for manual version 8100837 Rev 2 instruments from 10/2013
Minor visual changes to manual format
8100837_Rev 2_AC40 1060 Service manual.docx