AURICAL HIT and the OTOsuite HIT Module Reference Manual March 2015

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AURICAL HIT and the

OTOsuite HIT Module

Reference Manual

Doc. No. 7-50-1150-EN/04

Part No. 7-50-11500-EN

Page 2

Copyrightnotice

No part of this documentation orprogram may be reproduced, stored in a retrieval system, ortransmitted, in any form orby any

means, electronic, mechanical, photocopying, recording,or otherwise,without the prior written consent of GN Otometrics A/S.

Copyright© 2015, GN Otometrics A/S

Published in Denmark byGN Otometrics A/S, Denmark

All information, illustrations, and specifications in this manual are based on the latest productinformation available at the time of

publication. GN Otometrics A/Sreserves the right to make changes at any time without notice.

Registered trademarks and Trademarks

MADSEN Itera II,MADSEN OTOflex 100, OTOsuite,AURICAL FreeFit, AURICAL Visible Speech, MADSEN Astera², MADSEN Xeta, ICS

Chartr 200 VNG/ENG, ICS Chartr EP, OTOcam 300, MADSEN AccuScreen, MADSEN AccuLink,ICS AirCal, AURICAL Aud, AURICAL HIT,

ICS Impulse, OTObase and MADSEN Capella² are either registered trademarks ortrademarks of GN Otometrics A/S.

Versionrelease date

2015-03-17

Technicalsupport

Please contact your supplier.

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5.2

5.3

5.4

31

32

32

32

32

33

33

33

33

5.3.3 Calibrating the coupler microphone

The battery simulator

35

36

6

Troubleshooting

37

7

Standards and Safety

7.1 AURICAL HIT

7.2 Warning notes

7.3 The OTOsuite HIT Module

7.4 Manufacturer

7.4.1 Responsibility of the manufacturer

38

38

38

39

40

40

8

Technical specifications

41

Index

4

5.1.2 Cleaning accessories

Service and repair

5.2.1 Replacing/updating the reference microphone

5.2.2 Replacing/updating the coupler microphone

5.2.3 Replacing floor lining

Calibration

5.3.1 How often is calibration necessary?

5.3.2 Environment Report

Procedure

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1

Introduction

AURICAL HIT is designed for Hearing Instrument Testing and Coupler-Based Fitting.

AURICAL HIT connects via USB to a computer running the OTOsuite software.

•

With the OTOsuite HIT Module you can perform traditional hearing instrument testing according to either the ANSI or IEC test protocols, and obtain a

consistent picture of every hearing instrument, regardless of manufacturer or

type.

•

With the OTOsuite PMM Module you can perform Probe Microphone Measurements in a coupler for pre-programming and pre-fitting hearing instruments

without the client being present.

Hearing instruments

It is easy to position hearing instruments on snap-on couplers inside the AURICAL HIT test chamber and it is easy to access

the hearing instruments in the test chamber during test without disturbing the test setup.

The battery pill types are recognized automatically, and the reference microphone ensures reliable positioning in the test

chamber.

Directionality

The Directionality feature provides for fast measurement of directionality and quality check of the hearing instruments.

RECD

Real ear response can be recorded without having AURICAL HIT at hand, and coupler-based fitting can be performed by

itself without using AURICAL FreeFit.

Coupler-based fitting using RECD is a "coupler" mode as part of the PMM functionality for providing simple hearing instrument fitting. Coupler-based fitting is described in the AURICAL FreeFit and the Probe Microphone Measurements User

Manual.

AURICAL HIT supports stored coupler values which drastically reduces the need for measuring coupler responses.

NOAH integration

AURICAL HIT can operate either as a stand-alone system, or under the NOAH software, which was developed by HIMSA as a

common software platform for programming and fitting hearing instruments. NOAH integrates client records, audiological

data and the dedicated fitting modules from various hearing instrument manufacturers.

1.1

Intended Use

AURICAL HIT is intended for testing purposes by audiologists, hearing instrument dispensers, and other health care professionals in testing programmable hearing instruments.

Required qualifications

It is assumed that the user has a basic knowledge of how to compare the results of the hearing instrument tests with the

specifications from the hearing instrument manufacturer and to detect typical malfunctions of the hearing instrument.

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1 Introduction

1.2

Typographical conventions

The use of Warning, Caution and Note

To draw your attention to information regarding safe and appropriate use of the device or software, the manual uses precautionary statements as follows:

Warning • Indicates that there is a risk of death or serious injury to the user or patient.

Caution • Indicates that there is a risk of injury to the user or patient or risk of damage to data or the device.

Note • Indicates that you should take special notice.

1.2.1

Navigating this manual

Menus, icons and functions to select are shown in bold type, as for instance in:

•

6

Click the Set options icon on the toolbar or select Tools > Options.

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2 AURICAL HIT

2

AURICAL HIT

2.1

Unpacking AURICAL HIT

1. Unpack the device carefully.

When you unpack the device and accessories, it is a good idea to keep the packing material in which they were

delivered. If you need to send the device in for service, the original packing material will protect against damage during transport, etc.

2. Visually inspect the equipment for possible damage.

If damage has occurred, do not put the device into operation. Contact your local distributor for assistance.

3. Check with the packing list to make sure that you have received all necessary parts and accessories. If your package is

incomplete, contact your local distributor.

2.2

2.2.1

Installation

•

Place AURICAL HIT on an absolutely stable surface.

•

In order to exclude ambient noise and to comply with the ANSI S3.22 standard, place the system in a moderately

quiet room.

Connecting AURICAL HIT

1. Install OTOsuite on the PC. See the OTOsuite Installation Guide.

2. Connect the USB cable from the USB socket under AURICAL HIT to a USB socket in the PC. AURICAL HIT is powered by

the PC.

AURICAL HIT is selected automatically in OTOsuite.

If you wish to use a demo device, select Tools > Configuration Wizard. Click Configure next to AURICAL HIT, and

select Demo device.

2.2.2

Initial calibration

When you have connected AURICAL HIT to the PC, you must perform an initial calibration of the reference microphone.

See Calibrating the reference microphone ► 14.

Calibration procedures and general recommendations about calibration are described in Calibration ► 33.

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2.3

The test chamber

Using AURICAL HIT and positioning hearing instruments in the test chamber are described in Testing hearing instruments

► 14.

A. Reference microphone ► 9

B. BTE adapter tube ► 9

C. The coupler assembly ► 9

D. Battery simulator ► 11

E. Cable groove ► 11

F.

Elevation plate ► 11

G. Coupler microphone sockets ► 11

H. Sound absorbing foam lining ► 12

I.

Main loudspeaker ► 12

J.

Rear loudspeaker ► 12

K. The AURICAL HIT lid ► 12

L.

8

Telecoils ► 12

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2 AURICAL HIT

The AURICAL HIT handle ► 12

(some models only)

The Accessory Box ► 13

2.3.1

Reference microphone

The position of the reference microphone is easy to adjust. Make sure that the reference microphone does not come into

contact with AURICAL HIT when you close the lid so that the microphone is not pushed out of place when you close the

lid for testing.

2.3.2

BTE adapter tube

The BTE adapter tube can be bent to correctly position the microphone or microphones of

the hearing instrument in relation to the main loudspeaker. It is used for verification of BTE

hearing instruments as well as for measuring the coupler portion of RECD.

The adapter tube is compliant with ANSI and IEC requirements.

2.3.3

The coupler assembly

The coupler assembly consists of the following parts:

A. Coupler adapter

B. Coupler cavity

C. Coupler microphone

Coupler adapter

The Accessory Box provides a range of adapters for easy positioning of different types of hearing instruments.

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Coupler cavity

During tests in the test chamber, the hearing instrument is connected to a 2cc coupler cavity manufactured in accordance

with the ANSI standard. Alternatively, you can use an ear simulator. (Note that the ear simulator is not ANSI or IEC compliant, and is not recommended for RECD measurements.)

You can use the Coupler Type icons in the toolbar to toggle between 2cc coupler and ear simulator. The selected coupler type is saved with measurements for later reference.

Coupler microphone

The coupler microphone is located in a coupler bottom piece which must be attached to the coupler cavity.

You can use the coupler microphone either directly in AURICAL HIT or in the Accessory Box.

The system automatically detects and activates the coupler microphone regardless of which setup you are using.

AURICAL HIT

A. BTE testing - Low coupler position

B. ITE, RIE, thin-tube testing - High coupler position

The Accessory Box

Connect the mini-jack cable from the Accessory Box to the mini-jack socket under AURICAL HIT, and insert the coupler

microphone in the microphone socket in the Accessory Box.

A. Wireless hearing instrument testing

The purpose of using the coupler microphone in the Accessory Box is to acoustically separate the input signal from the

hearing instrument. This makes it possible to verify the external input device independently of the hearing instrument,

and is mainly used for testing devices such as FM and Bluetooth transmitters.

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2.3.4

Battery simulator

Using a battery simulator is highly recommended because it ensures that the hearing instrument is powered with the correct voltage and you avoid unnecessary battery waste for the purpose of coupler measurements.

See Using the battery simulator ► 17.

2.3.5

Cable groove

Wrap the programming cable of the hearing instrument once around the

cable groove. This prevents the hearing instrument from being pulled

out of place when you close the lid for testing.

2.3.6

Elevation plate

Use the elevation plate to facilitate positioning of wireless transmitters

and body worn hearing instruments at a level where the microphone or

microphones are approximately centered in relation to the loudspeaker.

•

2.3.7

To use the plate, lift it up from its recess and place it in the high-position coupler socket.

Coupler microphone sockets

AURICAL HIT

A. BTE testing - Low coupler position

B. ITE, RIE, thin-tube testing - High coupler position

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2.3.8

Sound absorbing foam lining

AURICAL HIT is lined with sound absorbing foam which is specifically designed to enhance the acoustic performance. Do

not remove any foam before measuring.

2.3.9

Main loudspeaker

The main loudspeaker is used for presenting regular acoustic test signals.

2.3.10

Rear loudspeaker

The rear loudspeaker presents the signal from behind the hearing instruments and is used for directional microphone testing.

2.3.11

The AURICAL HIT lid

The lid of AURICAL HIT has a closing mechanism that prevents the lid from slamming shut, which could upset the position

of the hearing instrument for testing.

Opening the lid

To open the lid, use only one hand to lift the lid gently.

Closing the lid

To close the lid, place your hand on the lid and press gently until the closing mechanism takes over the action.

2.3.12

Telecoils

4 induction loops are fitted in AURICAL HIT for testing telecoil functioning:

BTE testing

2.3.13

ITE testing

The AURICAL HIT handle

Note • This only applies to models equipped with a carrying handle.

The handle is designed for carrying AURICAL HIT.

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Caution • If you carry AURICAL HIT by its handle, do not use your other hand to support it by the lid, as this may

cause the lid to open and squeeze your fingers.

2.4

The Accessory Box

The Accessory Box is suited for storing coupler adapters,

battery simulators, etc., and fits in the test chamber when

not in use.

The Accessory Box serves as holder for the coupler microphone for testing hearing instruments outside

AURICAL HIT. See The coupler assembly ► 9.

Caution • Do not place the Accessory Box inside

AURICAL HIT during transportation.

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3

Testing hearing instruments

With AURICAL HIT and the OTOsuite HIT Module you can test the performance of hearing instruments according to both

ANSI and IEC standards. You can also perform coupler-based fitting as described in the AURICAL FreeFit and the Probe

Microphone Measurements User Manual.

Testing a hearing instrument involves the following main tasks:

1.

Calibrating the reference microphone

Otometrics recommends that you calibrate the reference microphone daily or weekly. Set up the interval to suit your purposes. See Calibrating the reference microphone ► 14.

2.

Positioning the hearing instrument

General instructions are described in

• Traditional BTE hearing instruments ► 19

•

Thin-tube hearing instruments ► 20

•

ITE hearing instruments ► 21

3.

Testing

When you have positioned the hearing instrument correctly, you can test it using the OTOsuite HIT module as described

in Testing the hearing instrument with OTOsuite HIT ► 25, or you can perform coupler-based fitting as described in the

AURICAL FreeFit and the Probe Microphone Measurements documentation.

3.1

Calibrating the reference microphone

1. Launch OTOsuite and select the HIT module in the Navigation

panel.

2. Position the microphones in the center of the test chamber.

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3. Position the reference microphone (1) pointing straight down from

above and centered 1-2 millimeters above the coupler measurement microphone (3).

4. During calibration the microphones must have the exact same distance to the main loudspeaker (2), along the Z axis. You can ensure

this by looking at the test chamber from the side when you adjust

the reference microphone position for calibration.

5. Close the lid.

6. Select Tools> AURICAL HIT Calibration > Reference Microphone.

7. Follow the on-screen instructions.

3.2

Positioning the hearing instrument for testing

How you position the hearing instrument for testing in the test chamber depends on the type of hearing instrument or

device you wish to test.

Regardless of form factor (the type of hearing instrument), the only two important things to remember are:

• Aligning directional microphones along the loudspeaker axis.

•

Positioning the reference microphone as close as possible to the front microphone of the hearing instrument without

touching it.

Single-microphone omni mode:

If the hearing instrument is not capable of single-microphone omni mode, it is recommended that you position the

hearing instrument at a 90° angle so that the distance is the same between the AURICAL HIT main loudspeaker and

the two hearing instrument microphones.This also means that you must reposition the hearing instrument in the

standard position before directional measurements are performed.

3.2.1

General guidelines for positioning the hearing instrument

The absolute position of the hearing instrument is not critical, as long as the reference microphone is correctly positioned.

You can position the hearing instrument to perform all standard hearing instrument tests without repositioning the hearing instrument between the individual tests:

• acoustic measurements,

•

inductive telecoil measurements,

•

directional microphone test.

1.

Positioning the hearing instrument

–

Angle or turn the hearing instrument so that the front microphone (1) faces the main loudspeaker as it would

when worn on a person’s ear.

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3 Testing hearing instruments

–

Position the hearing instrument so that a line through the front and rear directional microphones coincide with

the loudspeaker axis.

BTE

2.

Thin tube and RIE

ITE

Positioning the reference microphone

–

As a rule of thumb, position the reference microphone as close as possible to the front microphone of the hearing

instrument without actually touching it.

Maximum permitted distances are:

16

Vertically (Y axis)

8 mm (above)

Sideways (X axis)

±12 mm

Back-to-front (Z axis)

±3 mm

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3 Testing hearing instruments

BTE

Thin tube

ITE

3.2.2

Using the battery simulator

1. Select a battery simulator and insert it in the hearing instrument.

With AURICAL HIT you receive a set of 4 color-coded battery simulators, which are used to power the hearing instrument. They are also used as probes for measuring the power consumption.

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3 Testing hearing instruments

Red

A5

Yellow

A10

Brown

R41

Orange

R48

Blue

R44

The metal strip between the battery simulator and the handle fits between the battery door and the hearing instrument casing.

2. Insert the mini-jack connector of the battery simulator in the battery simulator socket in the test chamber.

AURICAL HIT automatically detects the battery simulator.

Caution • When you have connected the battery simulator, make

sure that it does not touch other metal parts as this may shortcircuit the system.

3.2.3

Coupler adapters

Adapters for use with the coupler are snapped onto the coupler cavity.

The adapters in the Accessory Box make it easy to position hearing instruments in the test chamber for testing

•

HA-2 (BTE)

Traditional BTE hearing instruments ► 19

•

HA-1 (ITE, RIE, thin-tube)

Thin-tube hearing instruments ► 20 and ITE hearing instruments ► 21

•

18

Thin-tube hearing instruments ► 20

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To fix the hearing instrument on the adapter, snap the adapter off the coupler cavity, and attach the hearing instrument to

the adapter outside the test chamber.

3.3

Traditional BTE hearing instruments

This procedure applies to any type of standard BTE hearing instruments with traditional ear molds.

Positioning the hearing instrument for directional testing is described in General guidelines for positioning the hearing

instrument ► 15.

3.3.1

With BTE adapter tube

1. Attach the BTE adapter tube to the tube stub on the HA-2 BTE adapter.

The tube must completely cover the tube stub on the adapter.

If a metal wire protrudes from the BTE adapter tube, turn the tube

upside down or use a new one.

2. Attach the hearing instrument to the free end of the BTE adapter tube

so that the metal wires in the tube align with the sides of the hearing

instrument.

3. Click the adapter with hearing instrument into place on the coupler and

place the coupler in the low position in AURICAL HIT.

.

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4. Align the microphones along the loudspeaker axis.

5. Position the reference microphone as close as possible to the front

microphone of the hearing instrument without touching.

6. Close the lid. You are ready to start testing.

3.4

Thin-tube hearing instruments

This type of procedure applies to any type of thin-tube hearing instruments, including instruments with the Receiver In

the Ear (RIE)/Receiver In the Canal (RIC), and pre-bent tubing.

Positioning the hearing instrument for directional testing is described in General guidelines for positioning the hearing

instrument ► 15.

3.4.1

Using the HA-1 ITE, RIE, thin-tube adapter

1. Remove the dome or tulip ear piece from the thin tube.

2. Wrap a thin roll of acoustic putty around the end of the thin tube.

3. Place the thin tube in the center of the hole in the HA-1 adapter so that

the thin tube’s entry hole is flush with the underside of the adapter.

4. Press the acoustic putty firmly around the thin tube.

5. Position the hearing instrument horizontally on a piece of acoustic putty

on the surface of the adapter so that the receiver part and the tubing

are not subjected to twisting or excessive force.

6. If you place some acoustic putty on the receiver wire, this will shift its

resonance frequency and prevent the wire from vibrating and creating

feedback during testing.

7. Click the adapter with hearing instrument into place on the coupler and

place the coupler in the high position in AURICAL HIT.

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8. Align the microphones along the loudspeaker axis.

9. Position the reference microphone as close as possible to the front

microphone of the hearing instrument without touching.

10. Close the lid. You are ready to start testing.

3.5

ITE hearing instruments

This procedure applies to any type of custom hearing instruments, including ITE (In The Ear), ITC (In The Canal), CIC (Completely In the Canal).

Positioning the hearing instrument for directional testing is described in General guidelines for positioning the hearing

instrument ► 15.

1. Wrap a thin roll of acoustic putty around the receiver end of the hearing

instrument.

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2. Place the receiver end in the center of the hole in the HA-1 adapter so

that the receiver end’s entry hole is flush with the underside of the

adapter.

3. Click the adapter with hearing instrument into place on the coupler and

place the coupler in the high position in AURICAL HIT.

4. Align the microphones along the loudspeaker axis.

5. Position the reference microphone as close as possible to the front

microphone of the hearing instrument without touching.

6. Close the lid. You are ready to start testing.

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3.6

Telecoil testing

1. Position the hearing instrument in AURICAL HIT as described in Traditional BTE hearing instruments ► 19, Thintube hearing instruments ► 20 or ITE hearing instruments ► 21, so that the maximum field strength will be

achieved for the hearing instrument.

During telecoil testing AURICAL HIT automatically detects the orientation of the hearing instrument.

2. Enable telecoil mode in the hearing instrument.

3. Close the lid and start testing.

3.7

Hearing instruments with wireless transmitters (e.g. FM)

When you test hearing instruments with wireless sound transmission, it is sometimes necessary to separate the input

device (transmitter) from the output device (receiver).

•

To do so, place the transmitter in AURICAL HIT and the receiver on the coupler microphone in the Accessory Box.

•

To set up the Accessory Box, see The coupler assembly ► 9.

This procedure applies to hearing instruments with FM functionality. Use the procedure to verify that the FM system is correctly adjusted for transparency and FM advantage.

The FM verification measurements (reference, transparency and FM advantage measurements) involve coupler measurements both inside and outside the test chamber.

What you need for testing

•

AURICAL HIT

•

An FM transmitter

•

Hearing instrument with FM receiver

•

Coupler assembly (adapter, coupler cavity and coupler microphone) placed in Accessory Box

•

Coupler cable between Accessory Box and AURICAL HIT

•

Insulating pad under Accessory Box

•

Acoustic putty (sealing material), such as Bostik Blu-Tack™

The measurement procedures described below serve as a guideline to show the intended workflow. This includes a

description of how to use OTOsuite’s two special tests for FM Sequence testing with the Feature-2-Benefit functionality in

OTOsuite PMM.

For detailed instructions on FM and hearing instrument settings, as well as interpretation of these measurements, see the

documentation provided by the manufacturer of the specific FM device.

Use the two special tests for FM testing in the PMM module. You can use these tests to automatically collect and compare

the relevant measurements for FM transparency and advantage. These special tests are based on a traditional 65 dB SPL

speech signal for reference and transparency, and an 80 dB SPL speech signal for FM advantage.

Perform reference measurements

1. To perform reference measurements, position the hearing instrument as described in Traditional BTE hearing instruments ► 19, Thin-tube hearing instruments ► 20 and ITE hearing instruments ► 21. Leave the hearing instrument placed on the coupler assembly in AURICAL HIT.

2. Set the hearing instrument to FM+HI mode.

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3 Testing hearing instruments

3. Make sure that only the hearing instrument receives an input signal by muffling the FM transmitter microphone.

4. In the OTOsuiteTest Selector select the special test FM Reference Sequence - HI in AURICAL HIT on the PMM tab.

The FreeStyle test screen in PMM is launched.

5. Close AURICAL HIT and click the Sequence button in the Control Panel to measure curves 1 and 3.

Perform FM transparency and FM advantage measurements

1. Connect the coupler cable from the Accessory Box to AURICAL HIT.

2. Place the hearing instrument setup in the top position coupler hole

of the Accessory Box and place the Accessory Box on an insulating

pad to prevent noise and vibration from influencing the test.

3. Raise the elevation plate in the test chamber.

4. Make sure that you have removed the material used to muffle the

FM transmitter microphone for the reference measurements.

For FM transmitter with built-in microphone:

–

Place the FM transmitter on the elevation plate in the test

chamber. If the transmitter has two or more microphones for

directionality, align them along the loudspeaker axis.

For FM transmitter with lapel microphone:

–

24

If the FM transmitter is equipped with a lapel microphone, run

the cable into the test chamber and fix the microphone to the

elevation plate.

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3 Testing hearing instruments

5. Position the reference microphone as close as possible to the microphone of the FM transmitter, but without touching.

6. In the OTOsuiteTest Selector select the special test FM Transparency & Advantage Sequence - HI outside AURICAL HIT on the

PMM tab.

7. Close the lid and click the Sequence button in the Control Panel to

measure curves 2 and 4.

8. Check the results in the dB Gain Difference graphs in the Feature2-Benefit view.

3.8

Body-worn hearing instruments

This procedure applies to body-worn hearing instruments.

What you need for testing

•

Coupler assembly (coupler cavity and coupler microphone) in Accessory Box

•

Adapter for body-worn hearing instrument

•

Coupler cable between Accessory Box and AURICAL HIT

1. Raise the elevation plate in AURICAL HIT.

2. Place the body-worn device on the elevation plate in the test chamber. If the device

has two or more microphones for directionality, align them along the loudspeaker

axis.

3. Remove the ear mold, if any, from the ear piece and attach the ear piece to the

adapter.

4. Connect the coupler cable from the Accessory Box to AURICAL HIT.

5. Place the ear piece setup in the top position coupler hole of the Accessory Box.

6. Close the lid. You are ready to start testing.

3.9

Testing the hearing instrument with OTOsuite HIT

When you have positioned the hearing instrument, you are ready to start testing.

3.9.1

•

To perform standard hearing instrument testing, see How to perform a standard test ► 25.

•

To perform coupler-based fitting, see the AURICAL FreeFit and the Probe Microphone Measurements manual.

How to perform a standard test

With OTOsuite you can perform standard electro-acoustic verification of hearing instruments according to the latest ANSI

and IEC standards. You can also customize the available options and save them as user tests or start-up settings.

The procedure

1. Launch the fitting software for the hearing instrument so that you can control its parameters.

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