Interacoustics AD629 User manual

Instructions for Use – EN
AD629
Science made smarter
D-0133833-A– 2022/09

Table of Contents
1INTRODUCTION ........................................................................................................................... 1
1.1 About this manual ............................................................................................................... 1
1.2 Intended use........................................................................................................................ 1
1.3 Product description ............................................................................................................. 2
1.4 Warnings ............................................................................................................................. 2
1.5 Complaints/safety reporting: ............................................................................................... 2
2UNPACKING AND INSTALLATION ............................................................................................ 3
2.1 Unpacking and inspection ................................................................................................... 3
2.2 Markings.............................................................................................................................. 4
2.3 General warnings and precautions ..................................................................................... 5
3GETTING STARTED - SETUP AND INSTALLATION................................................................. 7
3.1 Back panel external connections – standard accessories .................................................. 8
3.2 PC-interface ........................................................................................................................ 8
3.3 Patient communication and monitoring............................................................................... 9
Talk Forward ............................................................................................................. 9
Talk Back ................................................................................................................ 9
Monitoring ................................................................................................................ 9
3.4 Operating instructions ....................................................................................................... 10
3.5 Tests screens and function key descriptions .................................................................... 14
Tone test .............................................................................................................. 15
Stenger test............................................................................................................. 15
ABLB - Fowler test .................................................................................................. 16
Tone in noise test (Langenbeck test)...................................................................... 16
Weber .............................................................................................................. 17
Speech test ............................................................................................................. 17
Speech – CH2On.......................................................................................... 20
Speech in noise ............................................................................................ 20
3.6 Setup ................................................................................................................................ 26
AD629 setup ........................................................................................................... 27
Common settings .................................................................................................... 27
Tone settings .......................................................................................................... 29
Speech settings ...................................................................................................... 30
Auto settings ........................................................................................................... 31
Sessions and clients ............................................................................................... 31
Save session ................................................................................................ 32
Clients........................................................................................................... 32
3.7 Printing .............................................................................................................................. 33
3.8 AD629 stand alone unit, print logo update........................................................................ 33
3.9 Diagnostic Suite ................................................................................................................ 35
AD629 setup ........................................................................................................... 35
SYNC mode ............................................................................................................ 36
The SYNC tab......................................................................................................... 36
Client upload ........................................................................................................... 37
Session download................................................................................................... 37
3.10 Hybrid (online/PC-controlled) mode.................................................................................. 39
3.11 About Diagnostic Suite...................................................................................................... 40
4MAINTENANCE .......................................................................................................................... 41
4.1 General maintenance procedures..................................................................................... 41
4.2 How to clean Interacoustics products ............................................................................... 42
4.3 Concerning repair.............................................................................................................. 42
4.4 Warranty............................................................................................................................ 43

5GENERAL TECHNICAL SPECIFICATIONS.............................................................................. 44
5.1 AD629 technical specification ........................................................................................... 44
5.2 Survey of reference and max hearing level tone audiometer. .......................................... 48
5.3 AD629 pin assignments .................................................................................................... 59
5.4 Electromagnetic compatibility (EMC) ................................................................................ 60

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1Introduction
1.1 About this manual
This manual is valid for the AD629. This product is manufactured by:
Interacoustics A/S
Audiometer Allé 1
5500 Middelfart
Denmark
Tel.: [phone]
Fax: [phone]
E-mail: [e-mail]
Web: www.interacoustics.com
1.2 Intended use
The AD629 audiometer is designed to be a device for diagnosing hearing loss. Output and specificity of this
type of device are based on the test characteristics defined by the user and may vary depending on
environmental and operating conditions. The diagnosing of hearing loss using this kind of diagnostic
audiometer depends on the interaction with the patient. However, for patients not responding well
possibilities of various tests allow the tester to have at least some evaluative result. Thus, a “normal hearing”
result should not allow for ignoring other contra indications in this case. A full audiologic evaluation should be
administered if concerns about hearing sensitivity persist.
The AD629 audiometer is intended to be used by an audiologist, hearing healthcare professional or trained
technician in an extremely quiet environment according to the ISO standard 8253-1. This AD629 is intended
for all patient groups regarding sex, age, and health. Careful handling of the AD629 whenever in contact with
a patient should be of high priority. Calm and stable positioning while testing is preferred for optimal
accuracy.

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1.3 Product description
The AD629 is a 2 channel clinical audiometer offering air, bone, speech and free field line output. It
offers a wide range of clinical test features such as high frequency, SISI, etc.
1.4 Warnings
Throughout this manual, the following meaning of warnings, cautions and notices are used:
1.5 Complaints/safety reporting:
Please contact your local distributor in case of any incident related to product defects (hardware
defects or software bugs) or adverse events (which does not necessarily have a causal
association to the product). It is recommended for a user to report all the known facts about the
incident. Upon receipt of any serious incident with serious health impact for the patient or user
(serious adverse events), local distributor shall report to Interacoustics through its appropriate
vigilance system. Interacoustics shall ensure that the regulatory authority in patient’s home country is
informed according to the vigilance requirements. Interacoustics shall handle all the product complaints and
adverse events as per the internal procedure.
1) Applied parts according to IEC60601-1
Included parts
DD45 Audiometric headset1
B71 Bone conductor1
APS3 Patient response button1
Goose neck microphone
Power cable
Operation manual CD
Multilingual Instructions for Use
Optional parts
Diagnostic Suite software
OtoAccess® database
21925 Amplivox audio cups, noise reducing headset1
Carrying case (Standard or Trolly Style)
EARTone3A/5A Audiometric insert phones1
IP30 Audiometric insert phones1
HDA300 Audiometric headset with double mono 6.3mm jack
TDH39 Audiometric headset1
DD450 Audiometric headset1
DD65v2 Audiometric headset1
B81 Bone conductor1
Talk back microphone
Sound field speakers SP90 (with external power amp)
AP12 Power Amplifier 2x12 Watt
AP70 Power Amplifier 2x70 Watt
WARNING indicates a hazardous situation which, if not avoided, could result
in death or serious injury.
CAUTION, used with the safety alert symbol, indicates a hazardous situation
which, if not avoided, could result in damage of the equipment.
NOTICE NOTICE is used to address practices not related to personal injury or
damage of the equipment.

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2Unpacking and installation
2.1 Unpacking and inspection
Check for damage
When the AD629 is received, ensure that you have received all the components on the shipping checklist. All
the components should be checked visually for scratches and missing parts before use. All the contents of
the shipment have to be checked for their mechanical and electrical functioning. If the equipment is found
faulty, please contact your local distributor immediately. Keep the shipping materials for the carrier’s
inspection and insurance claim.
Keep carton for future shipment
The AD629 comes with shipping cartons, which are specifically designed for the components. It is
recommended to keep the cartons for future shipments in case of any need for return or service.
Reporting and returning procedure
Any missing part or malfunction or any damaged components (due to shipment) should be reported
immediately to the supplier/local distributor along with the invoice, serial number, and a detailed report of the
issue. For any on-site service-related information, please contact your local distributor. If the system /
components are to be returned for service, please fill all the details related to product issues in the ‘Return
Report’, which is attached to this manual. It is very important that you describe all the known facts about the
issue in the return report, as this will help the engineer to understand and solve the problem to your
satisfaction. Your local distributor holds the responsibility for coordinating any service/return procedure and
related formalities.
Storage
If you need to store the AD629 for a period, please ensure it is stored under the conditions specified in the
section for technical specifications:

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2.2 Markings
The following marking can be found on the AD629:
Symbol
Explanation
Type B applied parts
Follow instructions for use
WEEE (EU-directive)
This symbol indicates that when the end-user wishes to discard this product,
it must be sent to separate collection facilities for recovery and recycling.
0123
The CE-mark indicates that Interacoustics A/S meets the requirements of
Annex II of the Medical Device Directive 93/42/EEC. TÜV Product Service,
Identification No. 0123, has approved the quality system.
Year of manufacture
Manufacturer.
Medical Device
ETL listing mark
Logo

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2.3 General warnings and precautions
Read these instructions carefully and completely before using the product
Before connecting or while working with this AD629, the user should consider the following
warnings and act appropriately.
When connecting the AD629 to the computer, the following warnings must be observed:
•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
AD629 is connected to a PC (IT equipment forming a system) ensure not to touch the patient while
operating the PC.
A Separation Device (isolation device) is needed to isolate the equipment located outside the patient
environment from the equipment located inside the patient environment. In particular such a Separation
Device is required when a network connection is made. The requirement for the Separation Device is
defined in IEC 60601-1 clause 16
To avoid the risk of electric shock, this equipment must only be connected to supply mains with protective
earth. Do not use any additional multiple socket-outlet or extension cord.
This AD629 contains a coin-type lithium battery. The cell can only be changed by service personnel.
Batteries may explode or cause burns, if disassembled, crushed, or exposed to fire or high temperatures. Do
not short-circuit.
No modification of this equipment is allowed without Interacoustics’ authorization.
Interacoustics will make available on request circuit diagrams, component part lists, descriptions, calibration
instructions, or other information that will assist service personnel to repair those parts of this audiometer that
are designated by the Interacoustics as repairable by service personnel
Following general cautions to be considered while working with this AD629
Never insert or in any way use the insert headset without a new clean non defect test tip. Always make sure
that foam or ear-tip is mounted correctly. Ear tips and foam are meant for single use to avoid cross
contamination.
The AD629 is not intended to be used in environments exposed to fluid spills.

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It is recommended that the disposable foam ear tips supplied with the optional EarTone5A insert transducers
are replaced after each patient tested. Disposable plugs also ensure that sanitary conditions exist for each of
your patients, and that periodic cleaning of a headband or cushion is no longer required.
•The black tubing protruding the foam ear tip is attached to the sound tube nipple of the insert
transducer
•Roll the foam tip into the smallest possible diameter
•Insert into the ear canal of the patient
•Hold the foam tip until expanded and a seal is achieved
•After testing the patient, the foam tip including the black tubing is detached from the sound tube
nipple
•The insert transducer should be examined prior to attaching a new foam tip
The AD629 is not intended to be used in oxygen rich environments or use in conjunction with flammable
agents.
Although the AD629 fulfills the relevant EMC requirements, precautions should
be taken to 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 the
appendix regarding EMC.
Use of accessories, transducers, and cables other than specified, with the
exception of transducers and cables sold by Interacoustics or representatives,
may result in increased emission or decreased immunity of the equipment. For
a list of accessories, transducers and cables that fulfil the requirements please
also refer to the appendix regarding EMC.
NOTICE
To prevent system faults take appropriate precautions to avoid PC viruses and similar.
Using operating systems where Microsoft have discontinued software and security support will increase the
risk for viruses and malware, which may result in breakdowns, data loss and data theft and misuse.
Interacoustics A/S cannot be held liable for your data. Some Interacoustics A/S products support or may
work with operating systems unsupported by Microsoft. Interacoustics A/S recommends you to always use
Microsoft supported operating systems that are kept fully security updated.
Use only transducers calibrated with actual AD629. To identify a valid calibration, the serial number for the
AD629 will be marked on the transducer.
Within the European Union it is illegal to dispose electric and electronic waste as unsorted
municipal waste. Electric and electronic waste may contain hazardous substances and therefore
has to be collected separately. Such products will be marked with the crossed-out wheeled bin
shown below. The cooperation of the user is important in order to ensure a high level of reuse
and recycling of electric and electronic waste. Failing to recycle such waste products in an
appropriate way may endanger the environment and consequently the health of human beings.
To prevent system faults, take appropriate precautions to avoid PC viruses and similar.
CAUTION

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3Getting started - setup and installation
The following shows an overview of the AD629:
The top left part of the AD629 (display holder) contains monitor speaker.
The left side of the AD629 contains two mini jack connectors for a microphone and a headphone – or a
headset. This is used for talkback headphone/speaker (TB) and talk forward microphone (TF).
A goose neck microphone can be plugged into the top part of the AD629 just above the Talk Forward
button. This can be used for talk forward. When not plugged in the goose neck microphone can be placed
underneath the display. Please refer to the section about patient communication for more details.
The upper right side of the AD629 holds the on/off switch of the AD629.
Make sure that the audiometer is placed so that the patient cannot see/hear of the clinician uses the
AD629
Back Panel - connectors
Microphone
and
Headphone
(Headset)
mini jacks
Power
on/off
Front Panel
display &
buttons/dials
Talk
forward
mic.
Monitors
peaker

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3.1 Back panel external connections – standard accessories
The back panel contains all the rest of the main connectors (sockets):
Special notes:
•In addition to the standard DD45 headset, four other air conduction transducers may be used
(they all connect to specific outputs on the AD629):
•HDA300: High Frequency requires a HF headset
•EAR-Tone 3A or 5A general purpose insert phone: Insert headphone EAR-Tone 3A or
5A are high quality transducers that may be used instead of the DD45/TDH39. It
improves cross hearing from the normal approximately 40dB of the TDH39 to
approximately 70dB. Masking as well as avoiding over-masking is thus easier with this
type of headphone.
•IP30 insert phone is the standard insert phone with same properties as EAR-Tone 3A
•The LAN connection is currently not used for any application (only internally in production)
•Mic 2: Please refer to the section about Patient Communication (Talk Forward and Talk Back)
•CD-input: It is required that any attached CD-player has a linear frequency response in order to
comply with the requirements of IEC 60645-2
•USB connections is used for:
•PC connection to Diagnostic Suite (the large USB connector)
•Direct print
•PC-keyboard (for entering client names)
3.2 PC-interface
Please refer to the Diagnostic Suite operation manual regarding hybrid mode (on-line and PC-operated
mode) as well as patient/session data transfer.
3 USB A
connectors for
printer, mouse
keyboard and
memory stick
Standard
Headphones
DD45/TDH39/H
DA300/DD65v2
Bone
conductor
B71
Patient
Response
Switch
For Talk Back
Mic.
USB B Connector
for PC connection
Power
connector
LAN (for
future use)
Free Field 1
and 2 (external
amplification)
Insert Phone
Eartone 3A /
IP30
Insert
masking
Extra Talk
forward mic.,
e.g., for table
mic.
External CD /
MP3 input

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3.3 Patient communication and monitoring
Talk forward
Talk Forward is activated by the “Talk Forward” button (21). AD629 contains three microphone
connectors which will work in the following priority (depending on which one(s) is connected):
•Priority 1: The mini jack in the left side of the AD629 – can be used with a headset together with
the headphone connector. This has the first priority
•Priority 2: The swan neck microphone (1) of the AD629 is located above the “Talk Forward” (21)
button. If no mic. is connected to the priority 1 mic., this with be used
The image below will be shown while the talk forward (21) is active (by hold the button down) where the
calibration (gain) level and intensity level for patient communication can be adjusted. To change the
calibration level the clinician would adjust the HL dB dial (41) to the appropriate level. To adjust the
Intensity level the dial in channel 2 (43) would be used.
Talk back
The operator may use Talk Back (28) in one of the following ways:
•If no headphone is connected to the Talk Back (left side connector), the voice is wired through
the Talk Back speakers next to the display (2)
•If a headphone/headset is connected to the AD629, talk back will come through this instead
To adjust the TB level, hold down the TB button and use left/right rotary wheels to adjust the level.
Monitoring
Monitoring of channel 1, 2 or both channels together is available by selecting the “Monitor” button (27)
once, twice or three times. Selecting it a fourth time will switch off the monitoring function again. To adjust
the monitor levels, hold down the monitor button and use left/right rotary wheels to adjust the level.
Selecting desired way of listening:
The monitor signal will be available through the monitor headset if connected, the internal monitor
speaker.

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3.4 Operating instructions
The figure below shows the outline of the front plate of the AD629 including buttons, dials, and display:
The following table describes the functions of the various buttons and dials.
Name(s)/Function(s)
Description
1
Microphone
For live voice speech and talk forward instruction to the patient in
the test cabin.
2
Talk back Speaker
For speech feedback from the patient in the test cabin.
3
Color Display Screen
For displaying the different test screens. Will be further explained
in the sections describing the individual tests.
4
Tone and Response
Indicator
Indication light seen when a tone is presented to the patient.
Indication light seen when the patient activates the patient signal
using the patient response.
5
Channel 1
Indicates intensity level for channel 1, e.g.:
(21)
(4)
(3)
(5)
(15)
(16)
(7
(8
(9
(10)
(11)
(12)
(13)
(14
(17)
(18)
(19)
(20)
(22)
(23)
(24)
(25)
(26)
(27)
(28)
(29)
(30)
(31)
(32)
(33)
(34)
(35)
(36)
(37)
(38)
(39)
(40)
(41)
(43)
(42)
(2)
(6)
(1)

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6
Masking / Channel 2
Indicates masking or Intensity level for channel 2, e.g.:
7-14
Function Keys
These keys are context sensitive and depend on the selected test
screen. Will be further explained in the sections describing the
individual tests
.
15
Shift
The shift function will enable the clinician to activate the sub
functions written in italic underneath the buttons.
16
Temp Setup
Allows the clinician to make temporary changes in certain settings
within each test. To save the changes as default (for the next
session) press “Shift (15)” and then (14). Choose
between the different settings using the right rotary wheel (43).
Change the individual settings using the left rotary wheel (41).
17
Setup /
Tests
The common setting menu can be accessed for more specific
tests and changes to general settings can be made. This is also
where the special tests are accessed: Auto tests (HW, Békésy),
MHA, SISI. To save the changes as default (for the next session)
press “Shift (15)” and then (14). Choose between
the different settings using the right rotary wheel (43). Change the
individual settings using the left rotary wheel (41).
18
Delete /
del curve
Delete points during testing delete. Delete the entire test curve of a
graph by holding “Shift (15)” together with this button.
19
Save Session/
New Session
Saving a session after testing or alternatively add a new session by
holding the “Shift (15)” together with this button. (A new session will
recall the default settings saved in 16 and 17)
20
Print
Allows results to be printed directly after testing (via a supported
USB printer).
21
Talk Forward
Instruction to the patient directly through his headphones via the
microphone can be given. The intensity changes by turning the
“HL dB” (41) while holding the “Talk Forward” button.
22
Tone / Warble
Pure tones or warble tones can be chosen as stimuli by activating
this button once or twice. The stimuli chosen will be shown on the
display, e.g.:
23
Wavefile
Enables one to perform speech testing using loaded wave files,
i.e. pre-recorded speech material. Please see setup under Temp
Setup (15). Requires installation of speech material.

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24
Mic
For live speech testing through the microphone (1). The VU meter
can be seen on the display screen. Adjust the microphone gain by
holding down the Mic button for one second.
25
1 CD 2
By pressing this function once or twice it is possible to have
recorded speech in either channel 1 or channel 2 separately.
Adjust the gain of CD 1 and 2 by holding down the CD button for
one second.
26
Ext Range
Extended Range: Usually the maximum output is e.g., 100dB but
if a higher output e.g., 120 dB is needed then “Ext Range” can be
activated when reaching a certain level.
27
Ch 1 Monitor 2
With the activation of this button, presentation to the patient from
e.g., CD can be heard through the built in monitor of the AD629 or
monitor headset in both channel 1 and 2. Adjust the gain by holding
down the button for one second.
28
Talk Back
Talk back, when active allows the clinician to hear comments or
responses from the patient through the AD629 or monitor
headset. Adjust the gain by holding down the button for one
second.
29
Right / Insert
For selecting the right ear during testing. Insert phones for the
right ear can be activated by pressing twice.
30
Left / Insert
For selecting the left ear during testing. Insert phones for the left
ear can be activated by pressing twice.
31
R Bone L
For bone conduction testing.
•First push: selects the right ear for testing
•Second push: selects the left ear for testing
32
1 FF 2
Pressing “1 FF 2” will select free field speaker as output for Channel
1.
•First push: Free Field speaker 1
•Second push: Free Field speaker 2

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33
Man / Rev
Manual / Reverse tone presentation modes:
•First push: Manual tone presentation each time “Tone
Switch” (42) is activated
•Second push: The reverse function- continuous tone
presentation which will be interrupted each time “Tone
Switch” (42) is activated
34
Single / Multi
Pulsing modes:
•First push: the tone presented will have a pre-set length
when “Tone Switch” is activated. (Set up in the
“Setup/Tests” (17))
•Second push: the tone will be pulsing continuously.
•Third push: returns back to normal mode
35
Mask On/Off
Masking channel on/off:
•First push: turns masking on
•Second push: turns masking off
36
Sync
This allows the masking attenuator to the tone attenuator to be
activated. This option is used for e.g., synchronous masking.
37
Store
Use this function to store test thresholds / results.
38
No Resp
Use this function if the patient has shown no response to stimuli.
39
Down / Incorrect
Used to decrease the frequency level.
The AD629 has an incorporated automatic speech score counter.
Therefore, as a second function you can use this button as an
“Incorrect” button when performing speech tests. For automatic
speech score counting while testing speech push this button after
each word not heard correctly by the patient.
40
Up / Correct
Used to increase the frequency level.
The AD629 has an incorporated automatic speech score counter.
Therefore, as a second function you can use this button as a
“Correct” button when performing speech tests. For automatic
speech score counting while testing speech push this button after
each word heard correctly by the patient.
41
HL db Channel 1
This allows for the adjusting of the intensity in channel 1 shown at
(5) in the display.
42
Tone Switch / Enter
Used for tone presentation where the “Tone” light (4) will show.
Can also be used as “Enter” (selection) button.
43
Masking Channel 2
Adjust the intensity level in channel 2 or masking levels when
masking is used. Shown at (6) in the display.

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3.5 Tests screens and function key descriptions
The following tests are available from the Test (17) button. Use rotary wheels (41)/(43) to select the
individual test screen:
•Tone
•Stenger
•ABLB – Fowler
•Tone in noise – Langenbeck
•Weber
•Speech
•Auto – Hughson Westlake
•Auto – Békésy
•QuickSIN – Quick speech in noise
•SISI – Short increment sensitivity index
•MHA – Master Hearing Aid
•HLS – Hearing Loss Simulator
The (optional) HF (High Frequency) / HFz (High Frequency Zoom) test features are activated from the
Tone Screen – i.e. as extensions to the Tone audiogram test screen.
Please note that the tests available in this list depend on the test licenses installed on the AD629. This
may also vary from country to country.

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Tone test
The Tone test screen is used for pure/warble tone audiometry via normal headphones or insert phones,
bone conduction, free field audiometry, multi frequency (optional test) as well as high frequency/high
frequency zoom (optional). When using Bone conduction, masking must be applied to obtain correct
results.
Function key
Description
10
Only available if High Frequency is available (optional license) on the AD629.
Selects the HF phone connected to the separate HF connectors.
11
Choose between HL, MCL and UCL by holding the Function Key (8) and
select the required measuring type by using one of the rotary wheels (41)/(43).
12
Not used in this test screen.
13
Switch between magnified top bar and normal sized top bar.
14
View the masking levels (dual audiogram mode only).
15
Multi frequency (optional MF license).
16
High Frequency (optional HF license).
17
High Frequency Zoom (optional HF license).
Stenger test
The Stenger test is a test when a patient is suspected of feigning/faking a hearing loss and is based on
the auditory phenomenon, “The Stenger Principle”, that states that only the louder of two similar tones
presented to both ears at the same time will be perceived. As a general rule it has been recommended to
perform the Stenger test in case of unilateral hearing losses or significant asymmetries.
Please refer to the Tone Test section above for key function descriptions for Function Keys (7), (10), (11),
(12), (13), (14).

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ABLB - Fowler test
ABLB (Alternate Binaural Loudness Balancing) is a test to detect perceived loudness differences between
the ears. The test is designed for people with unilateral hearing loss. It serves as a possible test for
recruitment.
The test is performed at frequencies where recruitment is presumed. The same tone is presented
alternatively to both ears. The intensity is fixed in the impaired ear (20 dB above pure tone threshold).
The task of the patient is to adjust the level of the better ear until the signal in the two ears is of equal
intensity. Note however that the test may also be performed by fixing the intensity in the normal hearing
ear and having the patient set the tone for the impaired ear.
Please refer to the Tone Test section above for key function descriptions for Function Keys (7), (10), (11),
(12), (13), (14).
Tone in noise test (Langenbeck test)
Please refer to the Tone Test section above for key function descriptions for Function Keys (7), (8), (10),
(11), (12), (13), (14).

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AD629 - Instructions for Use - EN Page 17
Weber
The Weber test distinguished between conductive and sensorineural hearing loss through use of a bone
conductor. Use the indications to show where the tone is perceived. If the patient hears the tone better in
the poorer ear the hearing loss is conductive, and the tone is heard better in the better ear the hearing
loss is sensorineural at the given frequency.
The symbols for Weber correspond with the soft buttons:
Percieved right
Percieved center
Percieved left
Not heard
No reaction
Speech test
Speech testing can be done via pre-recorded wave files (23) (if installed), microphone (43) or CD input
(25).
Most people acquire hearing aids because they themselves or their relatives report that they have trouble
hearing speech. Speech audiometry has the advantage of other speech signals and is used to quantify
the patient’s ability to understand everyday communication. It examines the patient’s processing ability in
relation to their degree and type of hearing loss which can vary greatly between patients with the same
hearing loss configuration.
Speech audiometry can be performed using a number of tests. For example, SRT (Speech Reception
Threshold) refers to the level at which the patient can repeat 50% of the presented words correctly. It
serves as a check of the pure tone audiogram, gives an index of hearing sensitivity for speech, and helps
determine the starting point for other supra-threshold measures such as WR (Word Recognition). WR is
sometimes also referred to as SDS (Speech Discrimination Scores) and represents the number of words
correctly repeated expressed as a percentage.