Interacoustics AC40 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

Interacoustics AC40 Specifications

General

Brand	Interacoustics
Model	AC40
Category	Measuring Instruments
Language	English