Aearo 0808B Users Manual

Installation & Operation Manual

This Product is Listed by
UNDERWRITERS LABORATORIES INC.

and Bears the Mark:

UL60601-1, IEC60601-1,

3TEM CAN/CSA C22.2 No. 601.1

“CE” Mark
& WEEE (symbol)

here

Wilat_Op_Man_23Oct08.doc CONFIDENTIAL

Table of Contents

1. INTRODUCTION .....................................................................................................................................4

1.1. SYSTEM OVERVIEW ..........................................................................................................................5

1.2. FUNCTION IDENTIFICATION ................................................................................................................ 5

Table 1.1 WBU user functions and controls ............................................................................5

Table 1.2 WRU user functions and controls ............................................................................6

2. INSTALLATION AND SET UP................................................................................................................8

2.1 Setting the input impedance.......................................................................................................8

2.2 Setting a Link ID...........................................................................................................................9

2.3 Installing the WBU .....................................................................................................................10

2.4 Installing the WRU .....................................................................................................................11

3. CALIBRATION......................................................................................................................................11

3.1 PURE TONE CALIBRATION...............................................................................................................11

Table 3.1 - ANSI S3.6-2004 / ISO 389- 2:1994 Calibration Values..........................................12

3.2 CALIBRATION FOR SPEECH AUDIOMETRY ..........................................................................................13

Table 3.2 ANSI / IEC Maximum Hearing Level values in dB HL by frequency.....................13

4. USING THE WILAT SYSTEM............................................................................................................... 13

Table 4.1 Summary of channel mode selection......................................................................14

4.1 PRE-TEST PROCEDURES...................................................................................................................14

Table 4.2 Obtained Interaural Attenuation ..............................................................................15

5. BACKGROUND NOISE REDUCTION..................................................................................................16

Table 5.1 (From: ANSI S3.1-1999)............................................................................................16

6. WRU POWER MANAGEMENT............................................................................................................17

7. PRECAUTIONS, MAINTENANCE, AND TROUBLESHOOTING ........................................................18

7.1 INTERFERENCE WITH OTHER WIRELESS DEVICES ..............................................................................18

7.2 SEVERE MECHANICAL SHOCK .......................................................................................................... 18

7.3 DEVICE END OF LIFE DISPOSAL ........................................................................................................18

7.4 WBU OVERFLOW ALERT.................................................................................................................18

7.5 NO LINK CONDITION .......................................................................................................................18

8. REPLACING THE WRU BATTERY......................................................................................................19

9. SPECIFICATIONS.................................................................................................................................20

10. LIMITED WARRANTY.......................................................................................................................... 21

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1. Introduction

Congratulations on the purchase of your new E-A-R-TONE® WiLAT Audiometric Earphone
System. The E-A-RTONE
an audiometer and its earphones, bone conduction oscillator, and patient response button with a
wireless link. Test subjects within, or as required outside of a sound isolated room, can receive
calibrated air and bone conduction signals from an audiometer without the inconvenience and
frailty of a wired tether between the transducers and the audiometer or the sound room inside
wall. With appropriate set up and calibration, the E-A-R-TONE
(ANSI/IEC) specified characteristics for audiometers that require10Ω or 50Ω transducers, without
a wire connection between the test subject and the audiometer. The E-A-R-TONE
utilizes a redesigned E-A-RTONE 5A Insert Earphone as its transducer, providing all of the
clinical advantages of audiometric insert earphones in addition to remote operation capability.

Because the subject’s external canal is sealed with an E-A-R-LINK
both as a sound delivery system and ambient noise attenuator, reliable threshold measurement
can be accomplished in environments unsuitable for hearing testing with a traditional supra-aural
earphone.

Direct coupling also produces greater sound separation between ears across the test frequency
range. Clinically, that means more instances where the need for masking is eliminated, or the
level necessary for effective masking is lower. Your average testing time will decrease without
sacrificing reliability. The higher inter-aural attenuation values, relative to the accepted supra­aural values, cited in the Table 3.2 on page 13 of this manual should be applied. Basic masking
procedures are otherwise unaffected, i.e. only the crossover values in dB HL need to be adjusted.

E-A-R-LINK

®

tips are available in five sizes; three foam, and two PVC versions for infant testing.
The standard (3A) size foam eartip will comfortably fit most adult ear canals, a smaller (3B) size
is appropriate for pediatric testing, and an extra large (3C) size can be used to couple the
transducers to very large or surgically altered ear canals. To accommodate EACs too small for
the 3B tip, 3.5mm and 4.0mm PVC “Infant Eartips” are now available for your youngest patients.
E-A-RLINK tips should be disposed of after each use. Disposable plugs insure that sanitary
conditions exist for every test you perform, and the task of cleaning a headband and earphone
cushions is eliminated.

The WiLAT System can be set for either 10Ω or 50Ω impedance to match the output of most
commercially available audiometers. The E-A-RTONE
equipment designed for transducers with input impedance in excess of 50 ohms.

The RETSPL values and procedure for insert earphones cited in the ANSI S3.6–2004 Standard,
and reproduced in this booklet, must be used to calibrate your audiometer, before initial use, and
at least annually thereafter.

This instruction booklet is intended to provide information to allow you to perform hearing testing
with your audiometer and the E-A-RTONE
will be comparable to, or in certain instances more reliable than, measurements performed with
supra-aural earphones. Most questions regarding the use and calibration of the WiLAT can be
answered by reviewing this booklet and/or ANSI S3.6-2004, or its subsequent revision(s). For
information regarding technical assistance or replacement items, please contact your distributor,
or E-A-R Auditory Systems Customer Service at: [e-mail]



WiLAT has been designed to replace the wired connection between

®

WiLAT system will maintain the

®

foam plug, which functions

®

WiLAT is not compatible with audiometric

®

WiLAT System with the confidence that test results

.

®

WiLAT

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1.1. System Overview

The E-A-RTONE WiLAT system includes the following main components;

1. A Wireless Base Unit (WBU): connected via replaceable cables to each of the audiometer’s

Left Phone, Right Phone, and Bone Conduction (BC) analog audio outputs, and to a User
Response Button (URB) switch input. The WBU communicates with a patient worn wireless
remote unit via a digital radio frequency (RF) link.

2. A Wireless Remote Unit (WRU): a small rechargeable battery-operated device worn on the

patient’s chest, supported by an adjustable neck loop and connected via replaceable wires to
Left and Right insert phone transducers, and to a (test facility-provided) BC oscillator.

3. A user response button (URB): connected with a short wire to the WRU.

4. A charger for the WRU.

5. An AC/DC adaptor (power supply) for the WBU.

1.2. Function identification

Table 1.1 WBU user functions and controls

No. Function Description

Power jack Power from 110VAC/12VDC adaptor

1

Antenna jack For connecting the antenna or the antenna extension cord

2

Service jack Authorized technician use only

3

URB jack Connection to the audiometer’s user/patient response input plug

4

BC jack Input from audiometer’s bone conductor output

5

Right jack Input from audiometer’s right channel output

6

Left jack Input from audiometer’s left channel output

7

ON/OFF switch Push towards the back of the unit to turn ON,

8

ON LED Glows when the unit is turned ON

9

No Link LED Flashes when there is no link with the WRU

10

Low Bat. LED Flashes when WRU battery is low

11

OVFLO LED Glows when the input signal is too high

12

Right LED Red LED glows when the Right AC channel is selected

13

BC LED Green LED glows when the bone conduction channel is selected

14

Left LED Blue LED glows when the Left AC channel is selected

15

BC/RM Button Press to test bone conduction on the left ear and mask the right ear

16

AC L&R Button Press to test via Left and Right AC channels

17

BC/LM Button Press to test bone conductor on the right ear and mask the left ear

18

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Table 1.2 WRU user functions and controls

No Function Description

Right jack Output to the right insert phone

19

BC jack Output to the user provided bone conductor

20

Left jack Output to the left insert phone

21

ON/No Link LED Glows when the unit is ON. Flashes in No Link power down

22

Low BAT LED

23

ON/OFF switch To turn ON, push towards the bottom of the unit

24

URB jack Connection for the URB

25

Charging jack Connection for the wall charger.

26

Glows when the battery is low. Flashes (along with an audible alert from
WBU) when battery is completely discharged

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