Interacoustics AT235 Service Manual

Table of Contents
1 Introduction ...................................................................................................................................................... 1
1.1 About this manual .................................................................................................................................... 1
1.2 About warnings and cautions .................................................................................................................. 1
1.3 General information ................................................................................................................................. 1
2 Maintenance and Disassembly ....................................................................................................................... 2
2.1 General cleaning and maintenance procedure ....................................................................................... 2
2.2 Maintenance of the pump module ........................................................................................................... 3
2.3 Disassembling the Cabinet ...................................................................................................................... 6
2.3.1 Mainboard .................................................................................................................................... 7
2.3.2 Rotary dial .................................................................................................................................... 8
2.3.3 Display ......................................................................................................................................... 9
2.3.4 Nice to know ................................................................................................................................ 9
3 Calibration Procedure ................................................................................................................................... 10
3.1 Service, adjustment and repair .............................................................................................................. 10
3.1.1 Hardware calibration – requirements ........................................................................................ 10
3.2 Equipment requirements ....................................................................................................................... 11
3.2.1 Equipment requirements for impedance calibrations ................................................................ 11
3.2.2 Equipment requirements for audiometer calibrations ................................................................ 11
3.3 Calibration of test equipment ................................................................................................................. 12
3.3.1 Calibration mode entering ......................................................................................................... 12
3.3.2 Checklist for calibration ............................................................................................................. 13
3.4 Installing the Diagnostic Suite ............................................................................................................... 14
3.5 Main startup ........................................................................................................................................... 16
3.6 Saving the calibration data .................................................................................................................... 17
4 Calibration of Transducers ........................................................................................................................... 19
4.1 Calibration standard for Impedance ...................................................................................................... 19
4.1.1 Transducer setup ....................................................................................................................... 19
4.1.2 Probe tone speaker calibration .................................................................................................. 20
4.1.3 Transducer calibration ............................................................................................................... 21
4.1.4 Volume calibration ..................................................................................................................... 22
4.1.5 Pressure calibration ................................................................................................................... 23
4.1.6 Calibration standard for Audiometer .......................................................................................... 24
4.2 Selecting a transducer / how-to-guide ................................................................................................... 25
4.2.1 Transducer types and equipment requirements for calibration ................................................. 27
5 Testing the Tympanometer Functionality ................................................................................................... 29
5.1 Pressure test .......................................................................................................................................... 29
5.2 Diode test ............................................................................................................................................... 30
5.3 Volume test ............................................................................................................................................ 31
5.4 Attenuator test ....................................................................................................................................... 33
6 Appendix A – Technical Specifications .......................................................................................................... I
6.1 Calibration properties.............................................................................................................................. III
6.2 Reference values for stimulus calibration ................................................................................................ V
6.3 Reference equivalent threshold values for transducers ......................................................................... VI
6.4 Survey of reference and max. hearing level Tone Audiometer ............................................................. VII
6.5 Survey of reference and max. hearing level Tympanometer.................................................................. IX
7 Appendix B – Block Diagram .......................................................................................................................... x
8 Appendix C – Parts & Accessories ............................................................................................................... XI
9 Appendix D – Firmware Update Procedure ................................................................................................ XVI

Interacoustics AT235 Specifications

General

Brand	Interacoustics
Model	AT235
Category	Measuring Instruments
Language	English