Maico MA 42, MA 41 Operation Manual

Operation Manual
MA 42

Table of Contents

Operation Manual MA 42

Introduction ................................................................................................................. 4

1.1 General ...................................................................................................................... 4

1.2 Intended Use Statement ............................................................................................ 4

1.3 Indications for Use Statement .................................................................................... 4

1.4 Contraindications of Use Statement .......................................................................... 4

1.5 Essential Performance............................................................................................... 5

1.6 Description ................................................................................................................. 5

For your Safety ........................................................................................................... 6

2.1 How to read this Operation Manual ........................................................................... 6

2.2 Customer Responsibility ............................................................................................ 7

2.3 Manufacturer’s Liability .............................................................................................. 7

2.4 Regulatory Symbols .................................................................................................. 8

2.5 General Precautions .................................................................................................. 9

2.6 Electrical Safety and Measuring Security .................................................................. 9

2.7 Device Control ......................................................................................................... 11

2.8 Electromagnetic Compatibility (EMC) ...................................................................... 11

Warranty, Maintenance and After-Sales Service ................................................... 12

3.1 Warranty .................................................................................................................. 12

3.2 Maintenance ............................................................................................................ 12

3.3 Cleaning and Disinfection Recommendations ......................................................... 13

3.4 Accessories and Replacement Parts ....................................................................... 14

3.5 Recycling and Disposal ........................................................................................... 14

Unpacking and Hardware Orientation..................................................................... 15

4.1 Unpacking the System ............................................................................................. 15

4.2 Hardware Orientation............................................................................................... 17

Operating the Device ................................................................................................ 20

5.1 Getting started with the MA 42 ................................................................................ 20

5.2 Functionality of Operating Elements ........................................................................ 20

5.3 The Display of the MA 42 ........................................................................................ 23

5.4 Measurement Methods of Audiometry ..................................................................... 23

5.5 User Menu ............................................................................................................... 40

5.6 Managing Test Results ............................................................................................ 44

5.7 Patient Management................................................................................................ 45

Technical Data .......................................................................................................... 47

6.1 The MA 42 Hardware .............................................................................................. 47

6.2 Connections ............................................................................................................. 49

6.3 Pin Assignment ........................................................................................................ 50

6.4 Calibration Values and Maximum Levels ................................................................. 51

6.5 Electromagnetic Compatibility (EMC) ...................................................................... 58

6.6 Electrical Safety, EMC and Associated Standards .................................................. 60

6.7 Checklist for subjective Audiometer Testing ............................................................ 61

8100460 Rev. 8 2 24/04/2017

Title: MA 42 – Operation Manual
Date of issue/last revision: 24/04/2017

Operation Manual MA 42

MAICO Diagnostics GmbH
Sickingenstr. 70-71
10553 Berlin
Germany
Tel.: + 49 30 / 70 71 46-50
Fax: + 49 30 / 70 71 46-99
E-mail: [e-mail]
Internet: www.maico.biz

MAICO Diagnostics
10393 West 70th Street
Eden Prairie, MN 55344
United States
Tel.: [phone]
Fax: [phone]
E-mail: [e-mail]
Internet: www.maico-diagnostics.com

FOR NORTH- AND SOUTH AMERICA

Copyright © 2017 MAICO Diagnostics.

All rights reserved. No part of this publication may be reproduced or transmitted in any
form or by any means without the prior written permission of MAICO. The information in
this publication is proprietary to MAICO.

Compliance

MAICO Diagnostics is an ISO 13485 certified corporation.

Caution for USA: Federal Law restricts this device to sale by or on the order of a licensed
medical professional.

Trademark Notice

QuickSIN® is a U.S. registered trademark of Etymotic Research, Inc.

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Operation Manual MA 42

Introduction

This section offers you important information about:

 the intended use of the device
 indications and contraindications of use
 essential performance
 features and benefits
 a description of the device

1.1 General

Thank you for purchasing a quality product from MAICO Diagnostics. The Audiometer
MA 42 is manufactured to meet all quality and safety requirements, and has been certified
with the CE-symbol according to Medical Directive 93/42/EEC.

In designing the MA 42 we placed particular importance on making it a user-friendly
device, meaning its operation is simple and easy to understand. All functions of the MA
42 are software controlled, allowing easy upgrades of new features and function in the
future.

The user manual should make it as easy as possible for you to become familiar with the
functions of the MA 42.

If you have questions or ideas for further improvements, please contact us.
Your MAICO Team

1.2 Intended Use Statement

The MA 42 is a portable or stand-alone audiometer intended to be used for the
identification of hearing loss and the factors that contribute to the occurrence of the
hearing loss in the age range of children to adults. It is intended to be used by
audiologists, ENTs, hearing healthcare professionals, or other trained technicians in a
hospital, clinic, healthcare facility or other suitable quiet environment as defined in
ANSI S3.1/ISO 8253-1 or equivalent.

1.3 Indications for Use Statement

The MA 42 is a portable two-channel air, bone, and speech audiometer. This audiometer
is used to screen, test, and diagnose hearing loss.

1.4 Contraindications of Use Statement

The patient is too young, sick or uncooperative to perform the tasks.

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1.5 Essential Performance

The following is considered essential performance:

 To generate and present stimulus signals in the audible range as specified in the

applicable IEC 60645 series in normal condition

 Record and store a patient response

1.6 Description

The MA 42 is a portable two-channel audiometer with pure tone and speech testing. The
device also includes special test function: Master Hearing Aid, Decay (Carhart), SISI,
ABLB and MLB. It can be used as a portable audiometer or a desktop unit for ENT
diagnostics, hearing aid fittings in the office, and for mobile audiometry in clinics and
abroad.

The MA 42 audiometer delivers 11 air conduction (AC) test frequencies from 125 Hz
to 8 kHz, with transducer dependent levels from -10 dBHL to 120 dBHL. Bone conduction
(BC) can be tested with 10 test frequencies from 250 Hz to 8 kHz with levels from

-10 dBHL to 80 dBHL (with the standard bone conductor B71). As an upgrade option, the
MA 42 is also capable of high frequency audiometry up to 16 kHz.

The large back lighted LCD color display shows level, frequency, transducer, signal type,
audiograms, and other information for each channel.

The sound presented to the patient’s ear can be monitored by the examiner with an
internal monitor speaker or external monitor phone.

The MA 42 performs tests using headphones, bone conduction receiver, and
configuration dependent insert phones or speakers. Built-in test signals include pure tone,
pulse tone, warble tone, narrow band noise, white noise, and speech noise. Inputs include
ports for a live speech microphone and a CD player for speech test material. Speech tests
can also be imported via a removable SD memory card. Outputs have separate jacks for
air conduction headphones, bone conduction transducer, configuration dependent insert
phones and sound field speakers.

Furthermore, the patient management feature provides the ability to store results in the
device for further evaluation and documentation.

Results can be printed directly via a USB printer or stored as a PDF file on the included
SD memory card or USB flash drive. The MA 42 can be connected to the PC via USB to
track the session and store the results in NOAH or the MAICO Database.

In order to remain current with present and future technologies the MA 42 is compatible
with PCs, easy to use, extremely reliable, and is adaptable to future developments. It is
also designed to be easily serviced as the need arises.

The speaker outputs can also be used as line level outputs for an external amplifier or
active speaker. Please, contact your authorized service center to change to line output
levels.

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Operation Manual MA 42

WARNING

For your Safety

This section offers you important information about:

 how to read the operation manual
 where to spend special attention
 the customer responsibility
 the explanation of all regulatory symbols used
 important cautions and warnings that have to be considered during the

whole time handling and operating your device

2.1 How to read this Operation Manual

This Operation Manual contains information pertinent to the use of the MAICO device
system including safety information as well as maintenance and cleaning
recommendations.

READ THIS ENTIRE MANUAL BEFORE ATTEMPTING TO USE THIS
SYSTEM!

Use this device only as described in this manual.

In this manual, the following two labels identify potentially dangerous or destructive
conditions and procedures:

CAUTION

NOTE: Notes help you identify areas of possible confusion and avoid potential
problems during system operation.

All images and screenshots are only examples and may differ in
appearance from the actual device settings.

The WARNING label identifies conditions or practices that may
present danger to the patient and/or user.

The CAUTION label identifies conditions or practices that could
result in damage to the equipment

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Operation Manual MA 42

WARNING

2.2 Customer Responsibility

All safety precautions given in this operation manual must be observed at all times.
Failure to observe these precautions could result in damage to the equipment and injury
to the operator or subject.

The employer should instruct each employee in the recognition and avoidance of unsafe
conditions and the regulations applicable to his or her work environment to control or
eliminate any hazards or other exposure to illness or injury.

It is understood that safety rules within individual organizations vary. If a conflict exists
between the material contained in this manual and the rules of the organization using this
instrument, the more stringent rules should take precedence.

This product and its components performs reliably only when
operated and maintained in accordance with the instructions
contained in this manual, accompanying labels, and/or inserts.
A defective product should not be used. Make sure all
connections to external accessories are snug and secured
properly. Parts which may be broken or missing or are visibly
worn, distorted, or contaminated should be replaced
immediately with clean, genuine replacement parts
manufactured by or available from MAICO.

NOTE: Customer responsibility includes proper maintenance and cleaning of the
device (see Sections 3.2 and 3.3). Breach of the customer responsibility can lead to
limitations of Manufacturer’s Liability and Warranty (see Sections 2.3 and 3.1).

2.3 Manufacturer’s Liability

Usage of the device in a way deviant from the intended use leads to a limitation or
termination of the manufacturer’s liability in case of damage. Improper use includes
disregarding the operation manual, the operation of the device by underqualified
personnel as well as making unauthorized alterations on the device.

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Operation Manual MA 42

REP

2.4 Regulatory Symbols

The following Table 1 gives an explanation of the symbols used on the device itself, on
the packaging and the accompanying documents including the Operation Manual.

Table 1 Regulatory Symbols

REGULATORY SYMBOLS
SYMBOL DESCRIPTION

Serial number

Date of manufacture

Manufacturer

Caution, consult accompanying documents

Warning, consult accompanying documents

Return to authorized representative, special disposal
required

Reference number

Patient applied part type B according to IEC 60601-1

Refer to instruction manual (mandatory)

Keep away from rain

Transport and storage temperature range

Transport and storage humidity limitations

Voltage transformer

Electrostatic sensitive devices

Do not reuse

Authorized representative

Conforms to European Medical Device Directive 93/42/EEC

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ETL listed mark

Logo

WARNING

WARNING

WARNING

WARNING

WARNING

2.5 General Precautions

Before starting a measurement make sure, that the device
works properly.
Use and store the instrument indoors only. For operation,
storage and transport conditions see Table in Section 6
Technical Data.
For operation in certain places, a recalibration may be
necessary.

No modification of this equipment is allowed.
Do not drop or otherwise cause undue impact to this device.
If the instrument is dropped or otherwise damaged, return it

to the manufacturer for repair and/or calibration. Do not use
the instrument if any damage is suspected.

Calibration of the instrument: The audiometer and the
headphone complement each other and share the same
serial number (i.e. 7663252). Therefore, the instrument shall
not be used with any other headphone prior to recalibration.
Recalibration also needs to be conducted, when a defected
headphone is replaced.
Uncalibrated instruments may lead to faulty measurements
and sometimes even damage the hearing of the examinee.

Operation Manual MA 42

2.6 Electrical Safety and Measuring Security

This icon indicates that patient applied parts of the

In Case of Emergency

WARNING

In Case of Emergency

instrument conform to IEC 60601-1 Type B requirements.

In case of emergency, disconnect the instrument from the
computer.

In case of emergency, disconnect the instrument from
power supply.

Do not position the instrument in a way that it is difficult to
operate the disconnection device. The supply mains and
the power socket shall be accessible at all times.

Do not use the instrument if the mains cable and/or the
outlet is damaged.

To transfer data to a PC, establishing a PC-connection via
USB is required. See Section 4.2.4 on how to safely establish
a connection with a power supplied PC or laptop (medical
device/non-medical device) or to a battery-driven laptop.

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WARNING

WARNING

CAUTION

This equipment is intended to be connected to other equipment
thus forming a Medical Electrical System. External equipment
intended for connection to signal input, signal output or other
connectors shall comply with the relevant product standard e.g.
IEC 60950-1 for IT equipment and the IEC 60601-series for
medical electrical equipment. In addition, all such combinations
– Medical Electrical Systems – shall comply with the safety
requirements stated the general standard IEC 60601-1,
edition 3, clause 16. Any equipment not complying with the
leakage current requirements in IEC 60601-1 shall be kept
outside the patient environment i.e. at least 1.5 m from the
patient support or shall be supplied via a separation transformer
to reduce the leakage currents. Any person who connects
external equipment to signal input, signal output or other
connectors has formed a Medical Electrical System and is
therefore responsible for the system to comply with the
requirements. If in doubt, contact qualified medical technician
or your local representative. If the instrument is connect to a PC
(IT equipment forming a system) ensure not to touch the patient
while operating the PC.

If the instrument is connected to a PC (IT equipment
forming a system) assembly and modifications shall be
evaluated by qualified medical technician according to
safety regulations in IEC 60601.

The instrument is not intended for operation in areas with
an explosion hazard.

Never short-circuit the terminals.

In order to maintain a high level of safety and to ensure the
instrument works properly, it is necessary to have the
instrument and its power supply checked according to the
medical electrical safety standard IEC 60601-1 by a
qualified service technician at least once a year. For more
information see Section 3.

The use of non-calibrated devices can lead to incorrect test
results and is not advisable.

Prevent cable breakage: cables must not be bend or
buckled.

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Operation Manual MA 42

WARNING

2.7 Device Control

The user of the device should perform a subjective device check once a week according
ISO 8253-1. See Section 6.7 for a checklist.

For annual calibration please see Sections 2.6 and 3.1.

2.8 Electromagnetic Compatibility (EMC)

Electrostatic discharge (ESD) according to IEC 61000-4-2.
Use the device only in an electrostatic controlled
environment.

To avoid the risk of electric shock, this equipment must
only be connected to supply mains with protective earth.

The instrument fulfills the relevant EMC requirements.
Avoid unnecessary exposure to electromagnetic fields,
e.g. from mobile phones etc. If the device is used adjacent
to other equipment it must be observed that no mutual
disturbance appears.

Please also refer to EMC consideration in Section 6.5.

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Operation Manual MA 42

WARNING

Warranty, Maintenance and After-Sales Service

This section offers you important information about:

 warranty conditions
 maintenance
 cleaning and disinfection recommendations
 accessory and replacement parts
 recycling and disposal of the device

3.1 Warranty

The MAICO MA 42 is guaranteed for at least one year.
This warranty is extended to the original purchaser of the instrument by MAICO through

the distributor from whom it was purchased and covers defects in material and
workmanship for a period at least one year from date of delivery of the instrument to the
original purchaser.

The device shall only be repaired and serviced by your distributor or by an authorized
service center. Opening the instrument case voids the warranty.

No modification of this equipment is allowed.

In the event of repair during the guarantee period, please enclose evidence of purchase
with the instrument.

3.2 Maintenance

In order to ensure that the instrument works properly, it has to be checked and calibrated
at least once a year.

The service and calibration must be performed by your dealer or to a service center
authorized by MAICO.

When returning the instrument for repairs or calibration it is essential to send the acoustic
transducers with the device. Please include a detailed description of faults. In order to
prevent damage in transit, please use the original packing when returning the instrument.

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Operation Manual MA 42

WARNING

3.3 Cleaning and Disinfection Recommendations

It is recommended that parts (device and accessories like headphones, ear cushions)
which come in direct contact with the patient be subjected to standard cleaning and
disinfecting procedure between patients.

Recommendations for cleaning and disinfection of MAICO device presented in this
document are not intended to replace or contradict policies in effect or procedures
required for infection control at the facility.

If there is not a high infection potential, MAICO recommends:

 Before cleaning always switch off and disconnect the device from power supply.
 For cleaning use a lightly dampened cloth with soap water solution
 Disinfect the instrument and its accessories by wiping the surfaces with wet

Sani-Cloth® Active wipes or a comparable product and allow them to take effect
for the duration related to the specific disinfection aim listed in product data sheet
of the disinfection product. Please follow also its instructions for cleaning.

 Wipe before and after each patient
 After contamination
 After infectious patients

 Disinfect computer, keyboard, transport trolley etc. with Sani-Cloth® Active wipes:

 once a week
 after contamination
 when polluted

CAUTION

CAUTION

To avoid damage of the device and its accessories, please mind
the following:

Do not autoclave or sterilize.
Do not use the device in the presence of fluid that can come into

contact with any of the electronic components or wiring.
Should the user suspect fluids have contacted the system

components or accessories, the unit should not be used until
deemed safe by a MAICO certified service technician.

Do not use hard or pointed objects on the device or its accessories
Use 70 % isopropyl alcohol only on hard cover surfaces

Discard single-use equipment after use! In case of re-use of the
single-use equipment you enhance the risk of cross
contamination!

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Operation Manual MA 42

3.4 Accessories and Replacement Parts

Some reusable components are subject to wear with use over time. MAICO recommends
that you keep these replacement parts available (as appropriate for your MA 42 device
configuration). Ask your authorized local distributor when accessories need to be
replaced.

3.5 Recycling and Disposal

Within the European Union it is illegal to dispose of

electric and electronic waste as unsorted municipal
waste. According to this, all MAICO products sold after
August 13, 2005, are marked with a crossed-out wheeled
bin. Within the limits of Article (9) of
DIRECTIVE 2002/96/EC on waste electrical and
electronic equipment (WEEE), MAICO has changed their
sales policy. To avoid additional distribution costs we
assign the responsibility for the proper collection and
treatment according to legal regulations to our customers.

Non-European countries Outside the European Union, local regulations should be

followed when disposing of the product after its useful life.

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Operation Manual MA 42

Unpacking and Hardware Orientation

This section provides information on:

 unpacking the device
 components
 becoming familiar with the hardware inclusive connections
 how to store the device
 rear panel

4.1 Unpacking the System

Check Box and Contents for Damage

 It is recommended that you unpack your MA 42 carefully making sure that all

components are removed from the packing materials.

 Verify that all components are included as shown on the packing list included with

your shipment.

 If any component is missing, contact your distributor immediately to report the

shortage.

 If any component appears to be damaged in shipment, contact your distributor

immediately to report it. Do not attempt to use any component or device that
appears to be damaged.

Reporting Imperfections

Notify the carrier immediately if any mechanical damage is noted. This will insure that a
proper claim is made. Save all packaging material so the claim adjuster can inspect it as well.

Report Immediately any Faults

Any missing part or malfunction should be reported immediately to the supplier of the
device together with the invoice, serial number, and a detailed report of the problem.

Keep Packaging for Future Shipment

Save all the original packing material and the shipping container so the device can be
properly packed if it needs to be returned for service or calibration (see Section 3.2).

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Operation Manual MA 42

The availability of configurations with the following components is country
specific. Contact your local distributor for more information.

Components

DD45 Headphones *
TDH39 Headphones *
DD450 Headphones for high frequency audiometry (with High Tone License) *
B71 Bone Conductor *
B81 Bone Conductor *
BKH10 Bone Conductor with contra masking phone *
Holmco 8103 Headphones *
IP30 Insert Phones *
Canton CD220 Free Field Speaker *
Cable for Canton CD220 Free Field Speaker
Patient Response Switch
Carrying Case
Gooseneck Microphone
USB Cable
USB Flash Drive
SD Memory Card (2 GB)
Sennheiser PC 131 Headset for monitoring and talk forward
Stereo Adaptor, 1/8” to 1/4”
Monitor Phone for examiner
Talk-Back Microphone
Sound Room Patch Cords (single)

Sound Room Kit
CD Player incl. power supply and connecting cable
Operation Manual
Quick Guide

* Calibration required

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Operation Manual MA 42

WARNING

4.2 Hardware Orientation

4.2.1 Where to Setup

The MA 42 should be operated in a quiet room, so that the audiometric examinations are
not influenced by outside noises. Ambient sound pressure levels in an audiometric test
room shall not exceed the values specified in the norm ISO 8253-1:2010 or
ANSI S3.1-1999. For use in noisier environments, headphones with optional sound
insulation muffs are available.

Electronic devices, which emit strong electromagnetic fields (e.g. microwaves or
radiotherapy devices), can influence the function of the audiometer. Therefore, it is not
recommended to use these devices in close proximity to the audiometer as it may lead to
incorrect test results.

The test room must be at a normal temperature, usually from 15 °C/59 °F to 35 °C/95 °F,
and the device should be switched on approximately 10 minutes before the first
measurement. If the device has been cooled down (e.g. during transport), please wait until it
has warmed to room temperature before using.

External devices such as a computer, printer or Ethernet which
are connected to the device must meet electrical safety
requirements, such as IEC 60601-1 or UL 60601-1.
This is to avoid electrical shock to the user or the patient.
See Section 2 for more information

4.2.2 MA 42 Device

The ergonomic design of the MA 42 makes it easy to control the hearing level,
signal presentation, and frequency with one hand.

Figure 1

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Operation Manual MA 42

WARNING

11

13

14

16

15

12

9

10

8 7

6 5

4 2

1 3 17

4.2.3 Rear Panel Connections

Figure 2

: Power switch : CD input

: Power socket 100-240VAC/50-60Hz : Speaker left channel

: Network socket : Speaker right channel

: USB out socket : Bone conduction receiver

: USB in socket : Insert phone left channel

: Patient response switch socket : Insert phone right channel

: Talk Back microphone socket : Phone left channel

: Mic - live voice microphone socket : Phone right channel

: Mon - monitor phone output socket

4.2.4 Establishing a Connection to a PC, USB Printer or CD Player

To transfer data to a PC, establishing a PC connection via USB is required. If the MA 42
is used with office equipment that is not a medical device itself (see Table 2,
PC Connection 1), make sure to establish the PC connection in one of the following ways
(see Table 2, PC Connection 2, 3 or 4).

In case a CD player shall be connected proceed accordingly to PC Connection 3
(if used with a CD player with power supply) or 4 (if used with a battery driven CD player).

Make sure you use only office equipment with the device that
is a medical device itself or meets the requirements of
IEC 60950. If a non-medical device is used within the patient
environment (1.5 m from patient as defined in IEC 60601)
a voltage transformer must be used (exception: a battery driven
laptop is used).

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Table 2 PC-Connections

PC CONNECTIONS

PC Connection 1:
Medical device – Medical device

Operation Manual MA 42

PC Connection 2:
Medical device – Non-Medical device

PC Connection 3:
Medical device – Non-Medical device

PC Connection 4:
Medical device – Laptop (battery-driven)

4.2.5 Storage

When the MA 42 is not in use, store it in a location where it will be safe from damage to
the screen or other sensitive components such as the acoustic transducers and cables.
Store according to the recommended temperature conditions described in Section 6.1.

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Operation Manual MA 42

Operating the Device

This section offers you information about:

 how to get started with the MA 42
 the device layout
 the function keys
 performing the measurement methods of Audiometry
 patient management
 documentation of results
 changing settings in the user menu

5.1 Getting started with the MA 42

Place the MA 42 on a stable counter or table. Plug the power cord into the power socket
on the rear panel. Connect all accessories with the appropriate sockets as shown in
Section 4.2.3. Plug the power cord into a grounded outlet.

Turn On: The device can be turned on with the power switch, which is located on the rear
panel of the MA 42.

NOTE: A device should always be off when inserting or removing an accessory from
the rear panel connectors.

The device performs its initialization and boot up. Please wait until the test screen
appears, this can take up to 90 seconds. If an error is detected the startup is stopped and
a description of the error is shown on the display. In this case please contact your local
dealer for service.

Turn Off: The operation of the device can be safely terminated by using the power switch
found on the rear of the device or by disconnecting the power cable.

5.2 Functionality of Operating Elements

The main functions of the MA 42 are directly accessible by using the function buttons
which are located around the display (see Figure 3). As the buttons have changing
functionality, the actual function of each button is shown in the blue boxes on the screen
above the button.

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Operation Manual MA 42

The following table describes the main functions of each button for the tone and speech
audiometry screen:

Figure 3

(1) Level control: adjusts the hearing level for the left/right ear.
(2) STIM bar: presents or interrupts the signal for the left/right ear.
(3) STORE button: stores results for the left/right ear.
(4) Frequency Up: changes to higher frequency for tone audiometry, enters a correct

answer for Word Recognition Score (WRS) testing, or selects the next word in the
word list for Speech Recognition Threshold (SRT) testing with Wave files.

(5) Frequency Down: changes to lower frequency for tone audiometry, enters an

incorrect answer for WRS testing, or selects a previous word in the word list for
SRT testing with Wave files.

(6) Function button: Monitor with options to adjust monitor and talk back settings;

for speech, the input calibration for microphone or CD player can be adjusted.
(7) Function button: Function is displayed on the screen based on test screen:
Tone: Select New, to delete all stored results and start a new session.
Speech: Reset the result percentage counter or play Wave file.
(8) Channel STIM Mode/TALK button: to change from presenter to interrupter mode,

or to talk to the patient by pressing and holding the button down

(only one STIM/TALK button should be pressed for Talk Forward capability)

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Operation Manual MA 42

(9) Function button: to select left, right or swap
(10) Transducer selector button: to choose between Phones, Insert, Bone and Speaker

(only calibrated transducers are available)
(11) Function button: Function is displayed on the screen based on test screen:

Tone: signal selector, to choose between tone, narrow band noise, white noise,

or to switch the channel off

Speech: Select microphone, external CD player, Wave file or speech noise

as signal source.
(12) Test Signal selector button: Steady, Pulse, Warble, or P&W (pulse and warble tone)
(13) Function button: Function is displayed on the screen based on test screen:

Tone: Select test for selected receiver, either the pure tone threshold, Hearing

Level (HL), Most Comfortable Loudness (MCL), Uncomfortable Loudness (UCL),

or Over Threshold (OT) tests.

Speech: Select Speech Recognition Threshold (SRT), Word Recognition Score

(WRS), Master Hearing Aid (MHA), Most Comfortable Level (MCL),

or Uncomfortable Level (UCL).
(14) Select Unlock: Lock (locks the presentation of the signal in both channels), Track

(activates the masking noise to automatically increase and decrease level in

relationship to the signal), L&T (Lock and Track)
(15) Function button: Function is displayed on the screen:

Tone: signal selector, to choose between tone, narrow band noise, white noise,

or to switch the channel off

Speech: Select microphone, external CD player, Wave file or speech noise

as signal source.
(16) Transducer selector button: to choose between Phones, Insert, Bone and Speaker

(only calibrated receivers are available for selection)
(17) Function button: to select left, right, or swap
(18) Function button: to switch from tone to speech and back
(19) Function button - Menu: To enter the user menu, where settings can be adjusted,

results can be printed out sor stored as PDF on SD memory card or USB flash

drive or the patient list can be entered.
(20) SD memory card slot
(21) VU-Level meter

NOTE: When a Function button is grey, this identifies it as an inactive button with the
current test set-up (E.g. ).

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5.3 The Display of the MA 42

The device is set to air conduction and pure tone by default. When starting the MA 42 the
tone audiometry screen opens.

Figure 4

The default frequency is set to 1 kHz and the level of the tone is set to 30 dBHL for the
right channel, and 0 dBHL noise for the left. The level limits of the chosen transducer are
marked by gray shading in the lower area of the audiogram.

NOTE: Once the default settings are changed, the device applies the new settings.
Reset the device to return to the default settings.

The display has an energy saving function; the backlight of the display is automatically
dimmed after approximately three minutes. Any action with the MA 42, such as pressing
a button or rotating the dial, immediately illuminates the backlight.

5.4 Measurement Methods of Audiometry

The patient should sit at a distance of at least 1 m from the device.
Remove any obstructions that interferes with the earphone cushion placement over the

ear (e.g. hats, eyeglasses). Always use the headphones with appropriate padded ear
cushions.

Ensure the headphones are placed correctly over the patient’s ears and that the red side
is over the right ear and the blue side is over the left ear. Adjust the headband of the
headphones so that the receivers are at the correct height (the sound output grid on the
inside of the headphone should be directly over the ear canal).

Ask the patient to press the button on the patient response switch when the tone is heard,
even if it is barely audible.

For hygienic reasons it is important to clean and disinfect the ear cushions on the
headphone between patients (see Section 9).

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5.4.1 Tone Audiometry

The MA 42 supports tone audiometric testing methods. The following testing methods
can be started in the tone audiometry mode and the results can be saved to the device.

 Air conduction testing
 Bone conduction testing
 High tone audiometry (configuration dependent)
 Sound field testing
 Uncomfortable Loudness (UCL)
 Most Comfortable Loudness (MCL)
 Over threshold test: Decay, SISI, ABLB, and MLB

5.4.1.1 Pure Tone Testing

During pure tone audiometry, the patient’s hearing threshold is measured in comparison
with the normal hearing threshold. The examination starts with air conduction on the ear
with better hearing.

Figure 5

The default setting: right channel is set to air conduction pure tone and the left channel to
air conduction narrow band noise with manual masking. The frequency is automatically
set to 1000 Hz.

The audiometer provides two channels, which can be separately routed to the left or right
ear. Each channel can play back a signal and can be routed to one of the outputs. The
signal can be set for each channel independently to tone, narrow band noise or white
noise by the Function buttons (11) and (15).

Select the ear to be tested by pressing the Right or Left key (9), (17) on the control panel
underneath the screen.

Next, select the transducer to be used, headphones (Phones), insert phones (Insert),
bone conductor (Bone), or sound field speaker (Speaker) by pressing the appropriate
button (10), (16). Only calibrated transducers are selectable.

The level and frequency is displayed as a numerical value at the top of the screen and is
also indicated by the cursor within the audiogram.

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The dBHL level can be changed with the Level control dial on both sides (1) of the device.
Set the Level control dial to a value just below expected hearing loss and turn down the
level of the other ear.

Use the Frequency Up (4) or Down (5) keys to increase or decrease the frequency. Press
the STIM button (the blue part next to the Level control dial) to present or interrupt the
tone. The status LED for the Stimulus Mode button (8) illuminates when the tone
is presented.

Follow your preferred procedure for the hearing threshold evaluation.

NOTE: A warning prompt appears on the display in the event that the hearing level
exceeds 100 dBHL. The warning prompt disappears after approximately 3 seconds. As
long as the prompt is visible on the display, no further entries can be made.

Test the frequencies: Starting at 1,000 Hz, test the higher frequencies first, then the lower
frequencies.

Use the Frequency Up key (4) to select the next higher frequency and use the Frequency
Down key (5) to select the next lower frequency.

Once a threshold value is established at the desired frequency, press the Store button
(3) to store the threshold. The appropriate symbol plots in the audiogram on the display.

To delete a stored test point, select the corresponding frequency and then press both
frequency down keys (5) at the same time. The symbol of the stored test point disappears
from the audiogram. Make sure, that the correct transducer and test type (HL, MCL or
UCL) is selected before deleting.

If the patient is not responding, the current value can be marked as “no response” by
holding the store button pressed for 3 seconds. Once all frequencies are tested, select
the poorer ear and repeat the hearing threshold test.

Pulse Tone

If required, the test can also be performed with a pulsed tone. Set the Test Signal button
(12) on Pulse and the pure tone is switched to a pulsating tone.

Warble Tone

If required, the test can also be performed with a warble (frequency modulated) tone.
Press the Test Signal button (12) and the pure tone is frequency modulated. The warble
tone can also be pulsed as described above.

Noise

The signal may be changed from a pure tone to narrow-band noise or white noise by
pressing the signal key (11), (15) underneath the display, whichever one corresponds to
the current test channel. This changes the status displayed in the test channel from
“Tone” to “Noise.”

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5.4.1.2 Masking

Masking is required if there is a notable threshold difference between the left and right
ears. It is possible for sound to be transmitted to both ears via bone conduction while
testing the poorer ear. This is called “crossover.”

Crossover occurs often while testing bone conduction, but it can also occur during air
conduction testing. Relevant to crossover is the sound level received by the opposite ear.
The difference between the original test signal in the test ear and the received signal in
the opposite ear is called “interaural attenuation”.

For bone conduction measurements the interaural attenuation is 0 to 15 dB. Bone
conduction crossover is therefore possible even with a slight difference in hearing loss
between ears.

To ensure that the patient does not experience crossover, mask the opposite ear.
Masking increases the hearing threshold of the opposite ear when crossover is occurring.
For bone conduction the masking signal is automatically routed to the opposite output of
the phones or inserts.

The masking is done with a noise signal which is transmitted by the headphone. For pure
tone audiometry a narrowband noise is used. This noise changes its center frequency
according to the frequency of the test signal.

Manual Masking

The masking is switched on by selecting the signal source as noise (11) or (15) and then
pressing the STIM button (8) on the side presenting the noise.

NOTE: Be cautious to set the noise to an appropriate level prior to selecting STIM (8)
and turning on the masking noise to the patient.

Once the threshold has been established with the introduction of noise, press the Store
button on either side of the device. The hearing threshold value is stored in the audiogram
with the corresponding masking symbol.

The masking sound should be continuously presented for effective masking by pressing
the STIM button (2). You can interrupt or turn off the masking signal by pressing the
STIM button (2) again.

Automatic Masking

With the manual masking, as described above, the masking level should be adjusted every
time you change the test signal level. The MA 42 has a tracking function for easy masking.

Set the tone level and the masking level to a desired difference for effective masking.
Press the TRACK button (14) to implement the automatic masking feature. The masking
level is automatically changed if you adjust the test signal level (e.g. if the test level is at
30 dBHL and the masking level 50 dBHL and you change the test level to 45 dBHL
the masking level adjusts automatically to 65 dBHL).

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5.4.1.3 High Tone Audiometry (configuration dependent)

When available, pure tone hearing threshold of high frequencies from 8 kHz to 16 kHz
can be tested. The High Tone option must be activated and a separate high tone
transducer must be calibrated for all frequencies.

First select the corresponding output Phone or Insert by the button (10) or (16). The item
High Tone is now available in the Function button (13). Select High Tone by pressing the
Function button (13) until High Tone is highlighted. The High Tone diagram is displayed,
combining the left and right ears results. Additional frequencies from 8 kHz to 16 kHz can
be selected now by the Frequency Up (4) or Down (5) key. The test procedure is identical
to the description in Section 5.4.1.1.

If a transducer is selected which is not calibrated for high frequencies, the standard
diagram is displayed and high frequencies are not available.

On the print out, pure tone audiometry results appear in a high tone diagram combining
left and right ear results.

5.4.1.4 Bone Conduction Testing

Bone conduction - the transmission of sound waves through the skull directly to the inner
ear - provides information about the function of the inner ear. For a neural hearing loss
the values of air conduction and bone conduction are the same. In this case a hearing
loss of the middle ear can be eliminated.

Place the bone conduction oscillator so that the flat, circular side of the transducer is
placed on the mastoid, at the noticeable ledge of the cranial bone behind but not touching
the pinna. The other side of the headband is placed in front of the opposite ear.
Set the receiver selector to Bone (10) or (16) and the signal selector to Tone (11) or (15).

Perform the test in the same way as described in the air conduction section above.
For hygienic reasons it is important to clean and disinfect the bone conduction oscillator

after each patient (see Section 3.3).

5.4.1.5 Sound Field Testing (configuration dependent)

Set the transducer selector (10) or (16) to Speaker. Perform the test in the same way as
described in the air conduction section above.

Warble tones should be used in the sound field as pure tones may provide inaccurate
results in the typical test room.

When results are stored using sound field an ‘S’ is displayed on the audiogram. This signals
sound field/speakers were used for testing and ear specific information cannot be determined.

Results may also be displayed with an ‘A’ on the tone screen, when speaker is selected
as the transducer and Aided is selected from the Function button (13).

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WARNING

5.4.1.6 Uncomfortable Loudness (UCL) Testing

Testing of UCL can be measured using pure tone or speech stimuli. The purpose is to
determine the dBHL level at which the stimuli becomes uncomfortable to the patient. The
UCL is described as the level between very loud and too loud as perceived by the patient
when listening to the test signal. This information is valuable for determining the limits of
a patient's dynamic range.

Because this test uses high sound pressure levels, it is
extremely important to perform this test using the utmost
caution to avoid causing hearing loss. To prevent the
possibility of extreme discomfort by the patient, it is important
to start the test at a comfortable level.

Press and release the test mode selector key (13) below the display to select UCL. The
LCD display in the bottom row changes from HL to UCL. Start with a test level of 60 dB
and present the tone briefly (max. 1 s.). If the signal was recognized by the patient as “not
uncomfortable,” increase the level and proceed as described before. If the signal was
uncomfortable for the patient store the value. Proceed accordingly with other test
frequencies.

HL

5.4.1.7 Most Comfortable Loudness (MCL)

Testing of MCL can be measured using pure tone stimuli or speech. The purpose is to
determine the most comfortable listening level for the patient for a given stimulus.
The dB level at which the stimulus is the most comfortable is determined. This level might
be described as the level at which the patient would be comfortable listening for an
extended period of time. Press the test mode selector key (13) underneath the display
and select MCL in order to test and store the Most Comfortable Loudness.

5.4.1.8 The SISI Test

The SISI (Short Increment Sensitivity Index) is guided by the principle that patients with
cochlear impairment are hypersensitive to small intensity increments. The continuous test
tone is increased by 1 dB for a period of 0.2 seconds every 4.8 seconds. Whenever the
increment is heard the patient has to press the response switch. The MA 42 calculates
the percentage of detected increments. The SISI test information and the test score are
shown on the LCD display. The test ends automatically after 20 presented increments.
The score is expressed as a percentage of ratio of the increments heard to the delivered
increments (all increments heard = 100 % and no increments heard = 0 %). A high score
indicates a cochlear impairment. A low score is related to normal hearing or conductive
or retrocochlear pathology.

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5.4.1.8.1 Preparation of the SISI Test

To start the test select SISI with the Function button (13), choose OT Tests and SISI Test.

Figure 6

Select the test frequency with the frequency keys (4), (5). For the test you should choose
the frequency where the maximum bone conduction hearing loss is measured as
described in Section 6.1.3.

Adjust the test intensity with the Level control dial (1) to a value of 20 dB above the
individual hearing threshold.

Recognize that in the SISI mode the test is presented continuously. You can interrupt the
test by pressing the Pause (9) button. Press Start (19) to resume the test.

5.4.1.8.2 Training of the Patient

Only with careful training during the following conditioning phase can a valid test result
can be achieved.

The training starts with level steps of 5 dB. That means a continuous tone, e.g. 65 dBHL,
is briefly increased by 5 dB, e.g. to 70 dBHL. During the increment time, a green box is
shown in the middle of the LCD display. The number of detected (recognized) increments
is counted and shown on the display. Furthermore, the number of presented (given)
increments is shown. Instruct the patient to press the patient response button when they
hear a change in loudness from the continuous presentation tone. The response button
must be pressed while the green box is displayed on the screen and thus the tone is being
presented to the patient for this to be counted.

When the patient has understood the procedure of the test press the “Inc” button (11) to
select the increment level for the test (i.e. 1, 2, 3, 4, or 5 dB increments). Once selected
the increment level is displayed at the top of the screen below the frequency.

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5.4.1.8.3 Performing the SISI Test

When the patient is ready, set the increment to 1 dB and press the Start (19) button
to run the SISI test.

Now 20 increments are presented to the patient.
You can delay the test by pressing the Pause (9) button. This could be helpful in

determining if the patient malingers.
The test ends automatically after 20 presented increments. The number of detected

increments is counted and indicated as percentage of the presented increments.
The result is only stored if a minimum 10 increments has been presented.

If you are sure that the result of the test is consistent you can abort the test at any time
by pressing the Stop (18) button. The result is then indicated accordingly.

Retrocochlear hearing impairment is represented by low scores (< 25 %), cochlear
defects by high scores (> 70 %). Press the EXIT (6) button to leave the SISI test.

5.4.1.9 The Threshold Decay (Carhart) Test

This examination is conducted as a fatigue test in cases of sensitivity loss.
To start the test select Decay with the Function button (13), choose OT Tests. When the

screen advances, select Decay Test. Make sure that the correct transducer is selected in
advance as you cannot change transducers in this screen.

Select left or right ear (9) and the test frequency with the frequency keys (4), (5).

Figure 7

Adjust the test level with the intensity control dial (1). The level should be set to a value
5 dB above the individual pure tone hearing threshold at this frequency.

Instruct the patient to hold the response switch while the tone is heard and to release
the switch as soon as the tone is no longer heard.

Press Start (19) to begin the test and present the test signal to the patient.

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The patient response LED lights and a stopwatch counts the seconds as long as the
patient response switch is pressed. As soon as the patient releases the response switch,
the level is increased for 5 dB.

The test stops automatically if the patient is able to hear the tone at the same level for
60 seconds or if the level is increased for 30 dB. Press Stop (18) to terminate the test
manually.

5.4.1.10 ABLB

The ABLB (Alternate Binaural Loudness Balance) test is a recruitment test. Alternating
tones between the two ears with headphones are used. The intensity of the tone in the
better hearing ear is varied until the loudness of the tone is judged by the patient to be
equivalent in both ears. This is called loudness balance.

To start the test select OT Test with the Function button (13), choose ABLB, then
the ABLB test screen is displayed:

Figure 8

The test can be performed at all frequencies between 125 Hz and 8 kHz. Select the test
frequency by the Frequency Up (4) and Down (5) key. Set the level of the better hearing
ear 5 dB above the threshold. Present the left or right STIM button (2). Adjust the level of
the hearing-impaired ear with the Level control (1) until the loudness in both ears
matches. Press the left or right Store button (3). Repeat the test for several levels.

To perform the test at another frequency, press the Frequency Up (4) or Down (5) key.
A new ladder diagram appears. Use the Function button (9) or (11) to jump to the previous
or next diagram. Select 500 ms or 1000 ms as modulation time by the Function button
(13). To exit the ABLB test screen press the EXIT button (6).

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5.4.1.11 MLB

The MLB (Monaural Level Balance) test is used to detect perceived loudness differences
between two frequencies in the same ear. A tone with two alternating frequencies is
presented to the same ear. The level of the frequency with normal hearing threshold is
adjusted until it matches the loudness of the other frequency. The patient has to indicate
if the loudness of both frequencies is equal.

To start the test select OT Tests with the Function button (13), choose MLB (15), then the
MLB test screen is displayed:

Figure 9

Select the left or right ear by the Function button (9). Then select left and/or right
Frequency Up (5) or Down (5) buttons for selection of the frequencies to test. Adjust the
level by the Level controls (1). Present the stimulus using the STIM button (2). Press the
Store button (3) to save the level of equal loudness. Repeat the procedure for several
different levels.

To compare the loudness of further frequencies press the Frequency Up (4) or Down (5)
button, a new ladder diagram appears. Use the Function button (9) or (11) to jump to the
previous or next diagram. Select 500 ms or 1000 ms as modulation time by the Function
button (13). To exit the MLB test screen press the Exit button (6).

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5.4.1.12 Stenger

The Stenger test is used to confirm the presence of pseudohypacusis. During this test,
two tones of the same frequency are presented simultaneously to both ears, and only the
louder tone is perceived. Select HL to perform the Stenger test and setup the audiometer
to present a tone in both ears (9, 11, 15, 17). Instruct the patient to press the response
button when the tone is heard. Present a tone to the better hearing ear 10 dB above
threshold and wait for the patient to indicate the tone has been heard. Now present the
tone to the poorer ear 10 dB below the indicated threshold (the patient may “ignore” this
tone). Present the tones simultaneously by pressing the lock Function button (14) and the
STIM Mode button (8) to set it to interrupter mode. If the patient responds it is a negative.
If the patient does not respond it is a positive Stenger, indicating that the tone is heard in
the poorer ear and the patient is ignoring the stimulus.

5.4.1.13 Langenbeck

The Langenbeck noise audiometry investigates the hearing threshold of pure tones while
masking noise is presented simultaneously to the same ear with a constant level for all
frequencies. The tone in noise hearing threshold is typically as high as the level of the
noise. The noise has a higher influence to neural hearing losses and the tone in noise
hearing threshold is increased. Set the signal of the first channel to tone and the signal of
the second channel to noise and route both channels to the same ear. Set the level of the
noise to a fix value and test the hearing threshold.

5.4.2 Speech Audiometry

The MA 42 supports speech audiometry. To conduct speech tests using speech test
material you can use a CD player, Wave files from the SD memory card, or a microphone.

If you are using a CD player powered by electrical current, the
player must meet electrical safety requirements, such as IEC

CAUTION

60601-1 or UL 60601-1. This is to avoid electrical shock of
either the patient or you. If you are not sure if your player meets
these requirements it is safer to use battery power.

5.4.2.1 Input Calibration

The MA 42 must be calibrated to the particular speech test to ensure valid test levels.
That means every time you change the speech test CD you must recalibrate the device.

To calibrate the CD speech input, select CD with the signal selector key (11), (15).
Press the Monitor button (6) and then InCal (19) and the calibration screen appears
(see Input Calibration screen in Figure 11).

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Figure 10

Figure 11

On every CD with speech test material there is a reference signal, such as a reference
tone or speech simulating noise. Play back the reference signal from the CD. Use the left
or right Level control (1) and adjust the levels until the VU-meter (19) shows all yellow
lights and one green light.

If one or more red lights are on, reduce the level using the Level control dial (1).
To calibrate the microphone for live voice testing, select MIC with the Signal selector key

(11), (15). Press the Monitor button (6) and then InCal (19) and the calibration screen
appears. Use the left or right Level control (1) and adjust the levels until the VU-meter
(21) shows all yellow and one green light.

NOTE: When multiple individuals use the device, input calibration is required when
switching to a new user. The device stores that last input calibration for ease of use.

Store the calibration and leave the calibration mode by pressing the OK button on the left
side of the display.

The Wave files included with the device have been pre-calibrated and no input calibration
is required.

5.4.2.2 Performing Speech Testing

Use the Function button for Speech on the right side of the tone screen (18) to switch to
speech testing. The speech test screen opens, the right ear is selected, and the level is
set to the default value.

The Speech Recognition Threshold (SRT) is the hearing threshold for speech. It is the
lowest level at which the patient correctly recognizes 50 % of the speech. Speech testing
can be done via recorded speech test material from CD, Wave files, or with the
microphone and live voice using standardized word lists.

Ask the patient to repeat each word. Often times a carrier phrase such as, “Say the word
_______” may be used. The patient should sit at a distance of at least 1 meter from the
device. Additionally, any obstructions which may interfere with the placement of the
earphone cushions on the ear (i.e. hair, eyeglasses) should be removed.

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Figure 12

Ensure the headphones are put on correctly. Adjust the headband of the headphones so that
the receivers are at the correct height (the sound output grid should be placed directly over the
ear canal).

NOTE: When the patient is sitting in the same room as the tester, CD or Wave files
is recommended for stimulus presentation.

The signal can be set to microphone, CD, Wave file, Speech Noise (SN), or switched off, for
each channel independently by the Function buttons (11) and (15). Each channel can be
routed to the left or right ear by the Function buttons (9) or (17), this enables flexible mixing.

Select Phones, Insert, Bone, or Speaker (only calibrated receivers are available) by the
receiver Select button (10), (16). Toggle to the required signal by the Selector button (11)
or (15) to MIC/CD/Wave/SN.

5.4.2.3 Speech Audiometry with Microphone or CD player

Connect the microphone or CD player to the corresponding input on the rear side of your
MA 42. Set the signal of the test channel to microphone or CD by the Function button
(11). Make sure that the input signal is calibrated correctly, as described above.
Select the test SRT, WRS, MCL, MHA or UCL by the Function button (13).

For the SRT test familiarize the patient with a closed set of spondaic words at a level loud enough
for them to hear and understand. Begin the test and decrease the level as the patient repeats
the word. Once the threshold has been found press the Store button (3) to save the result.

For the WRS test, the level remains fixed and correct or incorrect answers can be entered
by the Frequency Plus (4) and Frequency Minus (5) button. Once the word list has been
completed by the patient, press the Store button to save the established WRS score.
To clear the word counter, press the Reset key (7) on the left side of the display.
If no counter is set the Reset key (7) is displayed grey.

If MCL is selected, the level is increased until the patient indicates the level is comfortable
to listen to. Store the value by pressing the Store button (3).

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For the UCL testing the level is increased until the patient indicates the level is
uncomfortable and the result can be saved by pressing the Store button (3).

To delete a stored test result, select the corresponding level, then press both frequency
down keys (5) at the same time. The test result disappears from the speech audiogram
or table. Make sure, that the correct transducer and test type (SRT, WRS, MCL or UCL)
is selected before deleting.

5.4.2.4 Speech Audiometry with Wave Files

If Wave is selected by the Speech Signal selector (11) or (15), a menu pops up with
available word lists which are stored on the SD memory card. A word list can be selected
by using the Level control (1) to scroll through the list. A list can be loaded by pressing
the Stimulus button (2). The word list is displayed on the speech audiometry screen.

The level is displayed as a numerical value at the top of the screen. The level can be
changed with the Level controls (1) on both sides of the device. Before starting the
playback of the Wave files, the first word can be selected by the Frequency Up (4) and
Down (5) buttons. Press the Function button Play (7) to start. Once the speech test is
started the test can only be stopped by pressing the Cancel (18) or Store (3).

Figure 13

The procedure for the SRT, WRS, MCL, and UCL test is the same as the procedure for CD
or microphone testing. For the SRT test, a word needs to be selected in the word list by the
Frequency up (4) or Down (5) key. When the Play button (7) is pressed, the selected word is
presented. Increase or decrease the level when the patient has a correct or incorrect
response until the SRT is estimated and store the result by pressing the Store button (3).

For the WRS test score, tally the correct words by pressing the Frequency Up (4) key and
the incorrect words by pressing the Frequency Down (5) key. The next word is played
back automatically. The correct word is displayed green, while incorrect word is displayed
red. By pressing Repeat (7), the word is repeated. Once a Wave file has been selected,
the intensity cannot be changed. Select the presentation level before selecting Play (7).

The percentage of the speech discrimination score is displayed and stored in the speech
table or audiogram as soon as the Store button (3) is pressed.

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Press the Function button List (6) to load another word list.
MCL and UCL measurements are best performed with the Passage Wave file included

with the device. Select the ear for testing and Wave as the speech signal. A menu pops
up with available word lists which are stored on the SD memory card, select Passages.
Press the Function button Play (7) to start the presentation. Rotate the Level control (1)
to increase the volume until the patient reports this is uncomfortably loud.
Press Store (3) to save the results.

5.4.2.5 Masking

Speech audiometry masking can be used in the same manner as described in Section

5.4.1.1 for pure tone audiometry. The signal of the non-testing ear is set to speech noise
(SN), instead of narrowband noise by the Function button (11) or (15). This channel needs
to be set to interrupter mode by pressing the channel STIM button (8) for continuous
presentation of the masking noise. Adjust the level of the masking channel by the
corresponding Level control (1) for effective masking.

5.4.2.6 Speech in Noise Tests - QuickSIN® (configuration dependent)

When performing speech in noise tests, speech and noise are given simultaneously in
two channels but in the same ear. The speech source can be provided by a microphone,
Wave files or an external CD player. Select the signal source on one channel
(button 11 or 13) and speech noise (SN) on the other channel.

To present the speech in noise in the same ear, the noise channel has to be routed to the
same ear the speech channel (button 9 or 17). Please make sure that the speech is
presented in interrupter mode (8) in order to present both signals simultaneously.

Speech-in-noise test, the QuickSIN®, was developed to provide a quick estimate of
signal-to-noise ratio (SNR) loss. Configuration dependent this test is incorporated into the
MA 42, with selection made in the speech testing screen under the Wave file lists
(11) or (15). For more information refer to Etymotic Research’s QuickSIN®
Speech-in-Noise Test manual. MA 42 does not incorporate the entire QuickSIN® lists but
provides Standard QuickSIN® lists 1-12 (i.e. Track 3-14 from the CD recording).

NOTE: Pre-calibration of the QuickSIN® lists was implemented into the recording and
installation of the Wave files on the MA 42. No input calibration is required.

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5.4.2.7 Master Hearing Aid (MHA)

After you have completed the speech audiometry testing you may wish to demonstrate to
the patient the difference a hearing aid can make. Use the MA 42 Master Hearing Aid
(MHA) to adjust various frequency slopes for speech signals.

Figure 14

The MHA feature utilizes input signals from the Live Voice (Mic), external CD/MP3 player
or Wave files. These signals are then filtered to simulate the benefit of hearing aids in the
case of a high frequency hearing loss. The level of the low frequencies can be reduced
by 6 dB, 12 dB, and 18 dB per octave.

Begin by selecting a signal source in the speech mode with the Function button (11) or
(15). Start the MHA function by pressing the Test Selection button (13). When using Wave
files begin testing by pressing the Play button (7) to play back the imbedded Wave files.
Press the Stimulus mode (11) or (15) indicator to alternate between signal sources like
the microphone or the CD. Change the dB presentation levels with the Level control dials
(1). The influence of the filters can be changed by using the Frequency Up (4) and Down
(5) keys. The MHA function can be performed using monaural or binaural presentations.

8100460 Rev. 8 38 24/04/2017

Operation Manual MA 42

5.4.3 Monitoring

All signals presented to the patient can be monitored by the examiner via a monitoring
headset or the internal speakers. For this purpose, press the Monitor button (6) and the
monitor screen appears. Then the monitor level of the left and right channel can be
adjusted with the corresponding Level control dial (1). Enable monitoring by pressing the
Function button Monitor (9), while Mic or CD is selected. Monitoring by the integrated
speaker is switched on by pressing the button (13) and the external headset is activated
for monitoring via button (11). In order to hear the signal given to the patient, make sure
to activate the corresponding channel for monitoring (9 and 17).

Figure 15

The talk back microphone is activated by the button (15) and its level adjusted by the
Frequency Up (4) and Down buttons (5).

5.4.4 Talk Forward

Connect the microphone headset (or optional gooseneck microphone) to the microphone
socket (8) on the rear side of the device.

NOTE: Only connect the microphone when the unit is off.

To talk to the patient press and hold the STIM/TALK button (8) and speak into the microphone.
Pressing only one STIM/TALK button is required to activate this feature. Adjust the level by
turning the left or right Level control (1) while pressing and holding the STIM/TALK button.

8100460 Rev. 8 39 24/04/2017

Operation Manual MA 42

5.5 User Menu

The User Menu enables the user to customize the device to meet their specific needs.
Additionally, the menu allows the user to print out the results via USB printer, store the
results as a PDF on an SD memory card or USB flash drive, and the ability to enter the
patient list. To enter the User Menu press the Menu button (19) on the right side of the
display.

Figure 16

To choose an item from the menu use the Level control dials (1). A short description of
the selected setting item are displayed below the user menu list.

To display the sub items or change the setting of the selected item press the
STIM Presenter button (2).

To confirm the changes press the OK button (7) on the left side of the display, or press
Cancel (6) to return without any change.

NOTE: When changes have been made to the menu and saved, restart the device
to confirm all changes are implemented.

8100460 Rev. 8 40 24/04/2017

Back

: Frequency control jumps to

Level

Steps

5 dB

;

2 dB; 1 dB

Change effect on dialing an

D

efines what happens if Swap

Pulse

500 ms, slow pulsing

250 ms, fast pulsing

These menu items are available:

Operation Manual MA 42

Setup Menu

Frequency Settings Default Frequency

Frequency Roll

Standard Frequencies

Level Default Level

Inverse Dialing

Speech Level Unit

Signal Default Signal Types

Swap Function

Display of the Left

and Right ear

Presenter Duration

Interrupter/Presenter

Description

Default Frequency Set (On/Off): set
default frequency to 1,000 Hz if side,
transducer or signal type has changed.

1,000 Hz if the highest and lowest
frequency was reached.
Stop: Frequency control function
stops at highest and lowest frequency.
Wrap: Jumps to the lowest/highest
frequency when the highest/lowest
frequency is reached.

Select/Deselect lists of available
frequencies in device.

On/Off: Set default level after
changing signal type.
Set Default Levels: Set the default level
for tone, noise and speech signals.

encoder: This changes the direction
of rotation of the dial required for
increasing or decreasing the level of
the signal (Dial Up; Dial Down).

dBSPL/dBHL: Select the level unit
for speech signals.

defines which signals are selected by
default: Signal/Noise or Signal/Signal.

is selected:
Swap Ears, the left and right ear
is interchanged, the signals of the
channels remain.
Swap signals, only the signals are
interchanged and the ears remain.

Same, left dial controls level of the
left ear, right dial controls the level
of the right ear
Interchanged, left and right dial
controls the level of the opposite ear

Unlimited, signal is presented as long
as the STIM bar is pressed:

1.5 seconds, signal is switched off
after 1.5 seconds.
User defined duration, user can define
a maximum presentation duration.

Default Presenter or Interrupter mode

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Operation Manual MA 42

Change the level after storing a

(10, 20, or 30

dB).

Stores PDF files to a USB flash drive

Change the display brightness

by pressing the Store button (3)

.

Setup Menu

Noise Interrupter/Presenter
Pure Tone Average

(PTA)

CD Channel Select the CD Channel
Store Properties

Change Frequency
after Store

Change Level after
Store

Default Transducer

Selection of Default
Transducer

Monitoring Monitoring
Tests Start Test

Printer Settings Set Printer Settings

PDF Save Option Save on SD Card

Save on USB Flash
Drive

Device Information Show Information
Date/Time Set Date/Time

Display Brightness

Description

Default presenter or interrupter mode
Select/Deselect frequencies for the

calculation of the PTA value for the
default transducer (500, 1000, 2000).

Both / Channel A / Channel B
Next: Move to next test frequency

after storing a threshold.
Remain: Stay on same frequency
after storing (Remain).

threshold. Stay at the same test level
(0 dB) or increase/decrease by

Headphones (on) or Inserts (off)

Monitor Speech only or All Signals
Tone/Speech defines test which

is loaded after start-up.
Opens a dialog to select a printer

and configure its settings
Stores PDF files to SD memory card

Shows device information
Opens a dialog to change the date,

time, and the date format to US or Int

from 1 % to 100 % by using the
Level controls (1), store new value

Language

Diagram Settings Display in Speech Test

Bone Lines

Symbol Setting

Import/Export
User Settings

8100460 Rev. 8 42 24/04/2017

Number of Diagrams
in Tone Test

English/Deutsch/Italiano/Français/
Español, etc.
Language change requires a restart
of the device.

Diagram or Table
None: No audiogram displayed,

only the level and frequency.
One: one combined audiogram
Two: two separate audiograms
for left and right

On/Off, displays a dotted line,
connecting the bone conduction results

Int Symbols / US Symbols /
UK Symbols

Export User Settings to SD Card or
Import User Settings from SD Card.
Provides the possibility to store the
user settings on a SD Card.

Operation Manual MA 42

5.5.1 Setup Date and Time

Select Date/Time in the User Menu by scrolling down with the left or right Level control (1) and
select Set Date/Time by using the Stimulus Presenter bar (2). The following screen appears:

Figure 17

Set the date format to International or US by the Function button (9). Jump to the required
position of the date or the time by the left Frequency Up/Down button (4) or (5) and
change the value by the right Frequency Up/Down button (4) or (5) or left Level control
(1). Press the Function button OK (6) to store the changes or Exit (7) to leave the
Date/Time setting screen without saving the changes.

5.5.2 Set Printer Settings

Select the printer by turning the left or right Level control (1) down. The color mode is
automatically adjusted. If the color mode is wrong adjust the color mode as well. Jump to
the field paper format by pressing the Stimulus Presenter bar (2) several times and select
A4 or Letter format by using the Level controls. If the printer is connected to your Ethernet
network select Ethernet as port. Additionally, the IP address of the printer needs to be
entered in the field “IP Address.” Select the number of the IP address by rotating the Level
controls and press the Store button to enter the selected number.

Save the settings and return to the User Menu by pressing the Function button OK (7).

Figure 18

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Operation Manual MA 42

Test your printer settings by a sample print before starting the audiological assessment.
The wrong settings may require a restart of the device.

Enter the field clinic name by using the STIM button (2). Select letters by rotating the
Level control (1) and enter the selected letter by pressing the Store button (3). Save the
settings and return to the User Menu by pressing the Function button OK (7).

5.6 Managing Test Results

All stored results can be directly printed via the USB printer. Make sure that a compatible
printer is connected via the USB port (4) and the device is configured according to the
connected printer settings; refer to menu settings in Section 5.5.2.

The results can also be stored as a PDF file on a SD memory card or USB flash drive
to be later transferred to a PC for further usage. The PDF file contains the measurement
results. An SD memory card needs to be inserted in the SD card slot (20) or a USB flash
drive connected to the USB socket (4) on the rear side of the device.

NOTE: It is recommended using the USB flash drive for storing PDF results.

NOTE: Please refer to the Audiometry Module operation manual for transferring

of results to the PC. This is located on the included CD and USB.
Before transferring data to a PC make sure that you have installed the PC software

properly according to the separately delivered operation manual.

When the examination is complete, press the Menu button (19) in the tone or speech test
mode. The user menu is opened and the functionality of the Function buttons (11), (13)
and (15) changes to PDF, Print, and Patients, respectively.

To print out the results press the Print button (13). Make sure that a compatible printer is
connected and the printer settings are correct.

To store the results on the SD memory card or USB flash drive, press the PDF button
(11). A PDF is created and stored on for further transfer to a PC or print out via a PC
connected printer. Make sure that the setting PDF Save Option is set to correct storage
medium SD memory card or USB flash drive.

Enter the patient list by pressing the Patient button (15) to store the results.
After printing or creating a PDF you return automatically to the tone or speech test mode.
To store the results within the Patient Management, review Section 5.7.

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Operation Manual MA 42

5.7 Patient Management

The patient management option allows the results of the audiological tests to be stored
on the SD memory card. The results can be reloaded at a later time to be reviewed,
edited, or printed. The patients can be stored by a number ID or by entering the name
and birth date. The demographic patient information can be entered using the Level
controls (1) or a connected USB keyboard.

Enter the User Menu by pressing the Menu button (19) in the tone or speech audiometry
screen. Press the button Patients (15) to display the patient list.

To comply with patient privacy laws the option to add a PIN code for entering to this list
has been offered when the language is set to English. Enter the Patient List and select
New Patient by pressing the New Patient button (15). Select Login On by pressing the
functional button Login On/Off (15). A screen appears to set your personal four digit login
PIN. Select four numbers between 0 and 9 by the level dial and enter each by pressing
the STIM button (2) and confirm your personal login PIN by pressing the button OK (9).

Caution: Remember the PIN very well, otherwise it is not possible to enter the
patient list anymore!

Each time you enter the patient list this PIN must be entered by selecting the digit by the
Level control dial and entering it by pressing the STIM bar (2). Moving forward, the PIN
is required to enter the patient list. To deactivate the PIN, select Login Off after following
the same steps as listed above.

Figure 19

Select a patient using the Level controls and press the Stimulus button (2) to display the
stored sessions. Select a session and press the PDF button (11) to save the PDF on the
SD memory card or USB flash drive. To print the results to a connected printer press
Print (13). The patient information is only included on the print out, if it is done in the
patient list, or if the PDF is created in the patient list screen.

Current results can be stored to a numbered patient or to a named patient. Entering the
Patient List, a patient with a new number is selected automatically. Just press the
Save button (9) to save the current session to the new patient number. To save the results
to an existing patient, select a patient by the Level controls and press the Save button.

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Operation Manual MA 42

To save the current results to a new patient with a new patient name, press the button
New Patient (15) and a screen appears to enter the patients last name, first name, ID
and date of birth.

Figure 20

Enter the characters of the name by scrolling through the alphabet with the Level controls
(1) and enter the selected character by using the Stimulus button (2). Jump to the next or
previous field by using the Frequency Up (4) or Down (5) button. The date can be entered
in the same manner with the Level controls. Delete the last character or number by
pressing the Delete button (19).

A USB keyboard can also be utilized to enter the patient information. Connect it to the
USB connector (4) and type in the characters. Jump to the next field with the tab key.
Press the Function button OK (6) to save the new patient and go back to the patient list.
The new patient is selected and the current measurement results can be saved to this
new patient by pressing the Function button Save (9).

Press the button No Name (9) to store the results only by a patient number, without
entering a name or use Cancel (6) to go back to the Patient List without saving.

8100460 Rev. 8 46 24/04/2017

Operation Manual MA 42

Technical Data

This section offers you important information about

 the MA 42 hardware specifications
 connections
 the pin assignment
 calibration values
 electromagnetic compatibility (EMC)
 electrical safety, EMC and associated Standards

6.1 The MA 42 Hardware

The MA 42 audiometer is an active, diagnostic medical

product according to the class IIa of the EU medical
directive 93/42/EEC.

General Information About Specifications

The performance and specifications of the device can only be guaranteed if it is
subject to technical maintenance at least once per year.

MAICO Diagnostics puts diagrams and service manuals at the disposal of authorized
service companies.

STANDARDS

Medical CE mark
Standards: ANSI S3.6: Type 2A

IEC 60645-1: Type 2
IEC 60645-2: Type A
ISO 389 Acoustics – Reference zero for calibration
of audiometric equipment
IEC 60601-1 class I, protection class B, International
Standards for Medical Electrical Equipment
Medical Device Directive 93/42/EEC

DEVICE SPECIFICATIONS

Power supply: 100 - 240 V~ 50/60 Hz ±10 %
Power Consumption: Approximately ~60 VA
Environmental

conditions:

Operation: +15 °C … +35 °C / +59 °F … +95 °F

Humidity: 30 % … 90 %, non-condensing

Storage: 0 °C … +50 °C / +32 °F … +122 °F

Humidity: 10 % … 95 %, non-condensing

Transport: -20 °C … +50 °C / -4 °F … +122 °F

Humidity: 10 % … 95 %, non-condensing

8100460 Rev. 8 47 24/04/2017

Operation Manual MA 42

Weight: 1.5 kg/2.7 lbs
Dimensions: W x D x H: 34.5 x 20 x 8 cm / 13.4” x 7.9” x 3.2”
Monitor: Build in monitor speaker, headset
Device Fuses: 2 x 1A slow blow
Warm-up Time: Less than 10 min after power on
Communication: Talk forward and talk back
Mode of Operation: Continuous
Stimulus Functions: Tone Presenter/Interrupter

Interlock (tone presentation of both channels simultaneously)
Tracking (fixed level difference between both channels)
Masking

Data Connection: USB, LAN Ethernet
External Devices: CD Player, USB Printer, USB Keyboard
Supported Printers: HP (PCL 3 and PCL 5e)

Epson (ESC/P2, LQ, Stylus Color)

AUDIOMETRY

Test signals: Pure tone, Pulse tone, Warble tone
Level Steps: 5 dB, 2 dB or 1 dB level steps (user selectable)
Test Frequencies: 125 Hz to 8,000 Hz

9,000 Hz to 16,000 Hz optional*

Masking Signals:

Narrow Band Noise: With the same center frequency resolution as pure tone

White Noise:

Speech Noise:12 dB/octave above 1 kHz (+/-5 dB)

Speech Signals:

External CD Player, Microphone, WAV file from SD memory card.

Maximum Sound Pressure Level:

AC with Headphone: -10 dBHL to 120 dBHL
BC with Bone Conduction

-10 dBHL to max. 80 dBHL

Oscillator:
Insert earphones: -10 dBHL to 120 dBHL
Sound field speaker from

Amp:

Tone: -10 dBHL to 100 dB
Speech: -10 dBHL to 90 dB

HL

HL

Modulation:
Pulse Tone: 0.25/0.5 s on time
Warble Tone: 5 % sinus frequency modulation, repetition rate 5 Hz

Tests:

Tone: HL, MCL, UCL
Speech: SRT, WRS, MCL, UCL, MHA
Over Threshold Test Decay, SISI, ABLB, MLB
Patient Response: Handheld response switch

8100460 Rev. 8 48 24/04/2017

7 6 5 4 2

6.2 Connections

Operation Manual MA 42

Figure 21

1

9

3

8

10

11

13

12

Table 3 Connections on Backside

CONNECTIONS

No Connection socket Specification

1 On/Off Power
2 Power (100 ... 240 V~ 50/60 Hz)
3 Network Ethernet
4 USB Out USB 2.0
5 USB In USB 2.0
6 Patient Response Switch
7 Talk Back Microphone
8 Mic (Microphoney)
9 Monitor Phone
10 CD Input
11 Speaker Left
12 Speaker Right
13 Bone (Bone Conductor)
14 Insert Phone Left
15 Insert Phone Right
16 Phone Left (Headphone)
17 Phone Right (Headphone)

RI= 500 Ω
ZI= 1 kΩ, UI= 0.38 - 500 mV
ZI= 1 kΩ, UI= 0.38 - 500 mV
ZA= 250 Ω, UA= 8 V

eff

ZI= 47 kΩ, UI= 0.04 - 5 V
ZA= 4 Ω, UA= 8 V
ZA= 4 Ω, UA= 8 V
ZA= 4 Ω, UA= 8 V
ZA=10 Ω, UA=1 V
ZA=10 Ω, UA=1 V
ZA=10 Ω, UA=1 V
ZA=10 Ω, UA=1 V

eff

eff

eff

eff

eff

eff

eff

14

15

eff

eff

eff

17

16

8100460 Rev. 8 49 24/04/2017

6.3 Pin Assignment

Operation Manual MA 42

Socket No. Connector Pin L

(left)

2

DC socket

L (Live)

Rated current
international:
250 V/2,5 A

Socket No. LAN Ethernet

3

RJ45 Socket

RJ45 Cable Plug

4

Pin G
(top)

G
(Ground)

Pin N
(right)

N (Neutral)

TX + Transmit Data
TX- Transmit Data­RX+ Receive Data+
Not connected
RX- Receive Data

1. +5 VDC

2. Data -

3. Data +

4. Ground

5

Socket No. Connector Pin 1 Pin 2 Pin 3

6; 7; 8; 11;
12; 13; 14;

Ground DC bias Signal

15; 16; 17

6.3 mm Stereo

-

9; 10

Ground DC bias Signal

Ground Right Left

3.5 mm Stereo

1. +5 VDC

2. Data -

3. Data +

4. Ground

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Operation Manual MA 42

6.4 Calibration Values and Maximum Levels

Calibration values and Max Levels: Headphone DD45

Coupler IEC 60318-3, Force 4-5 N, PTB-DTU Report 2009-2010

Frequency
[Hz]

Tone RETSPL
dB re 20µPa

NBN RETSPL
dB re 20µPa

Max Tone

[dBHL]

Max NBN

[dBHL]

125 47.5 51.5 90 75
250 27.0 31.0 110 95
500 13.0 17.0 120 110
750 6.5 11.5 120 110
1000 6.0 12.0 120 110
1500 8.0 14.0 120 110
2000 8.0 14.0 120 110
3000 8.0 14.0 120 110
4000 9.0 14.0 120 110
6000 20.5 25.5 120 110
8000 12.0 17.0 110 100

Signal IEC 60645-2

RETSPL

IEC Max

Level [dBHL]

ANSI S3.6

RETSPL

ANSI Max

Level [dBHL]

Speech 20.0 110 18.5 100
SN 20.0 110 18.5 110
WN 0.0 110 0.0 110

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Operation Manual MA 42

Calibration values and Max Levels: Headphone TDH39

Coupler IEC 60318-3, Force 4-5 N, ANSI S3.6 and ISO 389-1

Frequency
[Hz]

Tone RETSPL
dB re 20µPa

NBN RETSPL
dB re 20µPa

Max Tone

[dBHL]

Max NBN

[dBHL]

125 45.0 49.0 90 75
250 25.5 29.5 110 95
500 11.5 15.5 120 110
750 8/7.5 13/12.5 120 110
1000 7.0 13.0 120 110
1500 6.5 12.5 120 110
2000 9.0 15.0 120 110
3000 10.0 16.0 120 110
4000 9.5 14.5 120 110
6000 15.5 20.5 120 110
8000 13.0 18.0 110 100

Signal IEC 60645-2

RETSPL

IEC Max

Level [dBHL]

ANSI S3.6

RETSPL

ANSI Max

Level [dBHL]

Speech 20.0 110 19.5 110
SN 20.0 110 19.5 110
WN 0.0 110 0.0 110

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Operation Manual MA 42

Calibration values and Max Levels: Headphone Holmco 8103

Coupler IEC 60318-3, Force 4-5 N, PTB

Frequency
[Hz]

Tone RETSPL
dB re 20µPa

NBN RETSPL
dB re 20µPa

Max Tone

[dBHL]

Max NBN

[dBHL]

125 39.5 43.5 90 80
250 25.0 29.0 105 95
500 18.5 22.5 110 100
750 13.5 18.5 120 105
1000 12.0 18.0 120 110
1500 10.0 16.0 120 110
2000 9.5 15.5 120 110
3000 9.0 15.0 115 110
4000 9.0 14.0 110 110
6000 19.5 24.5 100 110
8000 20.0 25.0 100 110

Signal IEC 60645-2

RETSPL [dBHL]

IEC Max

Level [dBHL]

ANSI S3.6

RETSPL

ANSI Max

Level [dBHL]

Speech 20.0 110 24.5 110
SN 20.0 110 24.5 110
WN 0.0 110 0.00 110

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Operation Manual MA 42

Calibration values and Max Levels: Headphone DD450

Ear simulator IEC60318-1 with adapter, Force 8.8 N ± 0.5 N, ANSI 3.6 and ISO 389-8/ISO 389-5

Frequency
[Hz]

Tone RETSPL
[dB

SPL

]

NBN RETSPL
[dB

SPL

]

Max Tone

[dBHL]

Max NBN

[dBHL]

125 30.5 34.5 100 75
250 18.0 22.0 110 85
500 11.0 15.0 115 95
750 6.0 11.0 120 100
1000 5.5 11.5 120 100
1500 5.5 11.5 115 100
2000 4.5 10.5 115 100
3000 2.5 8.5 115 100
4000 9.5 14.5 115 100
6000 17.0 22.0 105 90
8000 17.5 22.5 105 90
9000 19.0 24.0 100 85
10000 22.0 27.0 100 85
11200 23.0 28.0 95 80
12500 27.5 32.5 90 75
14000 35.0 40.0 80 70
16000 56.0 61.0 60 60

Signal IEC 60645-2

RETSPL

IEC Max

Level [dBHL]

ANSI S3.6

RETSPL

ANSI Max

Level [dBHL]

Speech 20 90 19 90
SN 20 85 19 85
WN 0.0 115 0.0 115

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Operation Manual MA 42

Calibration values: Insert phone Eartone 3A and IP30

Reference equivalent threshold sound pressure level
Coupler IEC 60318-5, ANSI 3.6 and ISO 389-2

Frequency Hz Tone IEC

60318-5
RETSPL dB
re 20µPa

NBN IEC
60318-5
RETSPL dB
re 20µPa

Tone

Max Level

dBHL

Max Level

dBHL

125 26.0 30.0 90 90
250 14.0 18.0 105 105
500 5.5 9.5 110 110
750 2.0 7.0 115 110
1000 0.0 6.0 120 110
1500 2.0 8.0 120 110
2000 3.0 9.0 120 110
3000 3.5 9.5 120 110
4000 5.5 10.5 115 110
6000 2.0 7.0 100 100
8000 0.0 5.0 95 95

Signal IEC 60645-2

RETSPL

IEC Max Level

[dBHL]

ANSI S3.6

RETSPL

ANSI Max

Level [dBHL]

NBN

Speech 20.0 100 12.5 100
SN 20.0 100 12.5 100
WN 0.0 100 0.0 100

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Operation Manual MA 42

vcvcvc

Calibration values: Bone conductor Radioear B71/B71W/B81/BKH10
Force: 4.9 ... 5.9 N Mastoid placement

Coupler IEC 60318-6, ANSI 3.6-2010 and ISO 389-3

Frequency [Hz] Reference

Air radiation Max level

equivalent
threshold force
level for tone

[dB] (re 1µN) Min - max

[dB]

(ONLY for BKH10)

125

82.5 - -

Tone

[dBHL]

250 67 - 45
500 58 - 65
750 48.5 - 70
1000 42.5 - 70
1500 36.5 - 70
2000 31 - 75
3000 30 4-18 80
4000 35.5 - 80
6000 40 10.5-31 50
8000 40 - 50

Signal IEC 60645-2

RETSPL

IEC Max

Level [dBHL]

ANSI S3.6

RETSPL

ANSI Max

Level [dBHL]

Speech 55.00 60 55.00 65
SN 55.00 60 55.00 65
WN - - - -

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Operation Manual MA 42

Calibration values: Sound field (0 degree incidence)

Reference equivalent threshold sound pressure level and maximum hearing levels

For Canton CD220

ISO 389 – 7 and ANSI S3.6-1996

Frequency
[Hz]

Tone RETSPL
[dB

SPL

]

NBN RETSPL
[dB

SPL

]

Max level

Tone [dBHL]

CD220

Max level

NBN [dBHL]

CD220

125 22.0 22.0 65 55
250 11.0 11.0 75 70
500 4.0 4.0 85 75
750 2.0 2.0 85 75
1000 2.0 2.0 85 75
1500 0.5 0.5 90 80
2000 -1.5 -1.5 90 85
3000 -6.0 -6.0 90 85
4000 -6.5 -6.5 95 85
6000 2.5 2.5 85 80
8000 11.5 11.5 80 70

Signal IEC60645-2

RETSPL
[dBSPL]

IEC Max

Level [dBHL]

CD220

ANSI S3.6

RETSPL

[dBHL]

ANSI Max

Level [dBSPL]

CD220

Speech 0.0 90 14.5 75.5
SN 0.0 90 14.5 75.5
WN 0.0 90 0.0 75.5

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Operation Manual MA 42

Guidance and manufacturer’s declaration

- electromagnetic emissions

The

MA 42

is intended for use in the electromagnetic environment specified below. The customer or the user of the

MA 42

should assure that it is used in such an environment.

Emissions Test

Compliance

Electromagnetic environment

- guidance

Recommended separation distances between portable and mobile RF communications equipment and the

MA 42

.

Rated Maximum output

Separation distance according to frequency of transmitter

[m]

√



√



√



0.01

0.1

1

10

100

Guidance and Manufacturer’s Declaration

- Electromagnetic Immunit

y

Immunity Test

IEC 60601 Test

Compliance

Electromagnetic

< 5 %

UT

6.5 Electromagnetic Compatibility (EMC)

Portable and mobile RF communications equipment can affect the MA 42. Install and operate the MA 42 according to the EMC
information presented in this section.
The MA 42 has been tested for EMC emissions and immunity as a standalone MA 42. Do not use the MA 42 adjacent to or stacked with
other electronic equipment. If adjacent or stacked use is necessary, the user should verify normal operation in the configuration.
The use of accessories, transducers and cables other than those specified, with the exception of servicing parts sold by MAICO as
replacement parts for internal components, may result in increased EMISSIONS or decreased IMMUNITY of the device.
Anyone connecting additional equipment is responsible for making sure the system complies with the IEC 60601-1-2 standard.

RF emissions
CISPR 11

RF emissions
CISPR 11
Harmonic emissions
IEC 61000-3-2
Voltage fluctuations /
flicker emissions
IEC 61000-3-3

The MA 42 is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled. The customer or
the user of the MA 42 can help prevent electromagnetic interferences by maintaining a minimum distance between portable and
mobile RF communications equipment (transmitters) and the MA 42 as recommended below, according to the maximum output
power of the communications equipment.

power of transmitter [W]

0.12 0.12 0.23

0.37 0.37 0.74

1.17 1.17 2.33

3.70 3.70 7.37

11.70 11.70 23.30
For transmitters rated at a maximum output power not listed above, the recommended separation distance d in meters (m) can be
estimated using the equation applicable to the frequency of the transmitter, where P is the maximum output power rating of the
transmitter in watts (W) according to the transmitter manufacturer.

Note 1 At 80 MHz and 800 MHZ, the higher frequency range applies.
Note 2 These guidelines may not apply to all situations. Electromagnetic propagation is affected by absorption and reflection from

structures, objects and people.

Group 1 The MA 42 uses RF energy only for its internal function.

Class B The MA 42 is suitable for use in all commercial, industrial,

Complies
Class A Category
Complies

150 kHz to 80 MHz
d = 1.17

Therefore, its RF emissions are very low and are not likely to cause
any interference in nearby electronic equipment.

business, and residential environments.

80 MHz to 800 MHz
d = 1.17

800 MHz to 2.5 GHz
d = 2.23

The MA 42 is intended for use in the electromagnetic environment specified below. The customer or the user of the Instrument
should assure that it is used in such an environment.

Electrostatic Discharge
(ESD)

IEC 61000-4-2

Electrical fast
transient/burst

IEC61000-4-4
Surge

IEC 61000-4-5

Voltage dips, short
interruptions and voltage
variations on power
supply lines

IEC 61000-4-11

level

+6 kV contact

+8 kV air

+2 kV for power supply lines

+1 kV for input/output lines

+1 kV differential mode

+2 kV common mode

(>95 % dip in UT) for 0.5
cycle

40 % UT
(60 % dip in UT) for 5 cycles

70 % UT
(30 % dip in UT) for 25 cycles

<5 % UT
(>95 % dip in UT) for 5 sec

+6 kV contact

+8 kV air

+2 kV for power supply lines

+1 kV for input/output lines

+1 kV differential mode

+2 kV common mode

< 5 % UT
(>95 % dip in UT) for

0.5 cycle

40 % UT
(60 % dip in UT) for 5 cycles

70 % UT
(30 % dip in UT) for
25 cycles

<5 % UT

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Environment-Guidance

Floors should be wood, concrete or
ceramic tile. If floors are covered with
synthetic material, the relative
humidity should be greater than 30%.

Mains power quality should be that of
a typical commercial or residential
environment.

Mains power quality should be that of
a typical commercial or residential
environment.

Mains power quality should be that of
a typical commercial or residential
environment. If the user of the MA 42
requires continued operation during
power mains interruptions, it is
recommended that the MA 42 be
powered from an uninterruptable
power supply or its battery.

Operation Manual MA 42

Note:

Guidance and manufacturer’s declaration

— electromagnetic immunity

(a)

Power frequency (50/60
Hz)

IEC 61000-4-8

UT is the A.C. mains voltage prior to application of the test level.

The MA 42 is intended for use in the electromagnetic environment specified below. The customer or the user of the MA 42 should
assure that it is used in such an environment,
Immunity test IEC/EN 60601

Conducted RF
IEC/EN 61000-4-6

Radiated RF
IEC/EN 61000-4-3

3 A/m

test level

3 Vrms
150kHz to 80 MHz

3 V/m
80 MHz to 2,5 GHz

3 A/m

Compliance level Electromagnetic environment –

3 Vrms

3 V/m

Power frequency magnetic fields
should be at levels characteristic of a
typical location in a typical commercial
or residential environment.

guidance
Portable and mobile RF
communications equipment should be
used no closer to any parts of the MA
42, including cables, than the
recommended separation distance
calculated from the equation
applicable to the frequency of the
transmitter.

Recommended separation distance

Pd 2,1
Pd 2,1

80 MHz to 800 MHz

Pd 3,2

Where P is the maximum output
power rating of the transmitter in watts
(W) according to the transmitter
manufacturer and d is the
recommended separation distance in
meters (m).

Field strengths from fixed RF
transmitters, as determined by an
electromagnetic site survey, (a)
should be less than the compliance
level in each frequency range (b)

Interference may occur in the vicinity
of equipment marked with the
following symbol:

800 MHz to 2,5 GHz

NOTE 1 At 80 MHz and 800 MHz, the higher frequency range applies
NOTE 2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from
structures, objects and people.

Field strengths from fixed transmitters, such as base stations for radio (cellular/cordless) telephones and land mobile radios,
amateur radio, AM and FM radio broadcast and TV broadcast cannot be predicted theoretically with accuracy. To assess the
electromagnetic environment due to fixed RF transmitters, an electromagnetic site survey should be considered. If the measured field
strength in the location in which the MA 42 is used exceeds the applicable RF compliance level above, the MA 42 should be observed
to verify normal operation, If abnormal performance is observed, additional measures may be necessary, such as reorienting or
relocating the MA 42.

(b)

Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.

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Operation Manual MA 42

6.6 Electrical Safety, EMC and Associated Standards

1. UL 60601-1: Medical Electrical Equipment, Part 1 General Requirements for Safety

2. IEC/EN 60601-1: Medical Electrical Equipment, Part 1 General Requirements for Safety

3. CAN/CSA-C22.2 No. 60601-1: Medical Electrical Equipment, Part 1
General Requirements for Safety Electrical Equipment for Laboratory Use

4. IEC/EN 60601-1-1: Collateral Standard, Safety Requirements for
Medical Electrical Systems

5. IEC/EN 60601-1-2: Medical Electrical Equipment, Part 1 - Electromagnetic
Compatibility - Requirements and Tests

6. Essential Requirements of the current European Union Medical Device
Directive 93/42/EEC

7. 2011/65/EU of 8 June 2011 on the restriction of the use of certain hazardous
substances in electrical and electronic equipment (RoHS)

8. Directive 2002/96/EC of the European Parliament and of the Council of
27 January 2003 on waste electrical and electronic equipment (WEEE)

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Operation Manual MA 42

6.7 Checklist for subjective Audiometer Testing

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Internet:

www.maico.biz

Specifications are subject to change

Operation Manual MA 42

MAICO Diagnostics GmbH
Sickingenstr. 70-71
10553 Berlin
Germany
Tel.: + 49 30 / 70 71 46-50
Fax: + 49 30 / 70 71 46-99
E-mail: [e-mail]

8100460 Rev. 8 62 24/04/2017