Welch Allyn AudioScope 3 User manual

Portable

Audio Menu

Service Manual

Screening
Audiometer

Operating
Instructions

AudioScope®— U.S. Patent No. 4,567,881
AudioSpec®— Patent No. 4,380,998

Contents

Warnings ................................................................................ 2

Standards Compliance.......................................................... 3

AudioScope 3 – Introduction ................................................ 4

Hearing Loss.................................................................. 4

Traditional Hearing Testing............................................ 5

Screening Audiometry .......................................................... 7

Completing a Test.................................................................. 8

Guidelines for Selection of Screening Level ...................... 12

20 dB HL........................................................................ 12

25 dB HL........................................................................ 12

40 dB HL........................................................................ 12

General Protocol.................................................................... 13

Lamp and Battery Replacement.......................................... 14

Cover Removal and Replacement ................................ 14

Lamp Replacement ...................................................... 15

Battery Replacement .................................................... 16

Recharging ............................................................................ 17

Method 1: Using Charging Stand.................................. 17

Method 2: Using Charging Transformer........................ 18

Method 3: Using MicroTymp Printer/Charger................ 18

Wall Mounting Instructions .................................................. 19

Cleaning and Sterilization .................................................... 20

Charging Transformer/Charging Stand.......................... 20

AudioScope 3................................................................ 20

AudioSpecs.................................................................... 20

AudioScope 3 Parts and Accessories ................................ 21

Transformers (Charging) ................................................ 22

Service, Recalibration and Warranty .................................. 23

Service .......................................................................... 23

Recalibration .................................................................. 23

Warranty ........................................................................ 24

Technical Specifications ...................................................... 25

AudioScope 3................................................................ 25

Charging Stand Specifications...................................... 27

Charging Transformers.................................................. 28

Circuit Diagram for Charging Transformers .................. 28

1

Warnings

WARNING: Refer to Owner’s Manual.
Use with Welch Allyn Charging Stand (#71123, #71126);

Direct Plug-In Chargers (#71040, #71032, #71034,
#71036) and/or MicroTymp Printer/Chargers (#71130,
#71135, #71170, #71175) only.

Use with approved accessories only.
Lamp may be hot after use. Use caution during

replacement.
Not for use in the presence of flammable anesthetics.
For Service in North America, instrument should be

returned to an authorized Welch Allyn distributor or to
Technical Service Department, Welch Allyn, Inc., 4341
State Street Road, Skaneateles Falls, NY 13153-0220
U.S.A. Telephone: [phone] (U.S.A. ONLY) OR
315-685-4560; 1-800-561-8797 (CANADA ONLY) OR
416-890-0004.

AVERTISSEMENT : Se référer au Manuel de
l’operateur.

N’utiliser qu’avec le socle de charge Welch Allyn
(n° 71123, 71126), les chargeurs directs enfichables
(n° 71040, 71032, 71034, 71036) et/ou les imprimantes/
chargeurs MicroTymp (n° 71130, 71135, 71170, 71175).

N’utiliser qu’avec les accessoires agréés.
La lampe peut être brûlante après l’emploi. Observer

des précautions en la remplaçant.
Ne pas utiliser en présence d’anesthésiques

inflammables.
Clients situés en Amérique du Nord : réexpédier

l’instrument à réparer à un distributeur agréé Welch
Allyn ou au centre de service Welch Allyn suivant
uniquement : Technical Service Department, Welch
Allyn, Inc., 4341 State Street Road, Skaneateles Falls,
NY 13153-0220 U.S.A. Téléphone: 800-669-9771 (É.U.
UNIQUEMENT) ou 315-685-3445 ; 1-800-561-8797
(CANADA UNIQUEMENT) ou 416-890-0004.

2

Warnings and Standards

Standards Compliance

The Model 23300 AudioScope 3 complies with the following
standards to the extent that they apply to this instrument:

Type BF equipment

ANSI S3.6-1969 (R1973): Standard for Audiometers

IEC 645-1979: Standard for Audiometers

ETL listed: UL2601, CSA C22.2, No 601-1, IEC 601-1

71040 Only: UL Recognized, CSA Certified

The CE mark on this device indicates it has been
tested to and conforms with the provisions noted
within the 93/42/EEC Medical Device Directive.

0050

La marque CE figurant sur ce produit indique que
les ésultats des tests auxquels il a été soumis sont
conformes aux dispositions
enregistrées dans la Directive 93/42/CEE

0050

concernant les instruments médicaux.

Compliance

Authorized European Representative Address:
Adresse du représentant européen agréé :

European Regulatory Manager
Welch Allyn, Ltd.,
Kells Road, Navan,
County Meath,
Republic of Ireland
Tel. [phone]
Fax [phone]

3

AudioScope 3 – Introduction

Thank you for purchasing the AudioScope 3. The operating and
maintenance instructions found in this manual should be followed
to ensure many years of accurate and reliable service. Please read

these instructions thoroughly before using your new AudioScope 3.

HEARING LOSS

The Invisible Handicap Role of the Professional/Paraprofessional

Over 20 million people in the United States (one out of every 15
individuals) suffer from hearing loss. Many other countries report
similar statistics.

Hearing problems can affect an individual’s social adjustment,
speech and Ianguage development, academic progress, as well as
the psychological well-being of that individual and his or her family.

Fortunately, most hearing problems can be very successfully
addressed through medical treatment and/or aural rehabilitation.

The crucial element and first step is early detection, and it is here
that professionals and paraprofessionals play a vital role.

While audiologists and otolaryngologists are specially trained for
testing and treating ear diseases, the primary care setting is ideally
suited for first and early detection of the problem, since people fre­quently visit these groups: pediatricians, family practitioners, gener­al practitioners, speech-language pathologists, nurse practitioners,
physician assistants, public health personnel, school health nurses
and volunteers.

With a fast, simple, accurate method of hearing screening, early
detection and appropriate referrals can be more efficiently and
effectively accomplished.

4

TRADITIONAL HEARING TESTING

Tuning forks were one of the first methods used to determine the
type of hearing loss. They may still be used by some to differenti­ate between conductive and sensorineural losses. However, they
have in great part been replaced by the audiometer.

Traditional audiometers produce pure tones of varying frequency
and intensity. Frequency is measured in Hertz (Hz) or cycles per
second, and is perceived as pitch. Human hearing ranges from
approximately 20 to 20,000 Hz. Intensity is measured in decibels
(dB) and is perceived as loudness.

Most often, hearing is measured by specialists in terms of thresh­old, or the faintest sound which an average listener can just hear in
the quiet. Thresholds are measured at various frequencies, usually
in the speech range (500 Hz to 4000 Hz) and just beyond (125 Hz
to 8000 Hz).

The magnitude or degree of loss is recorded on a form called an
audiogram shown on Table 1 (p. 6).

Measurements are made by air conduction, where the sound is
introduced through a headphone into the ear. Measurements may
also be made by bone conduction, where the sound is introduced
through a vibrator which is placed on the mastoid bone behind the
ear. By comparing these two measurements, the type of loss (con­ductive, sensorineural or mixed), can be determined.

AudioScope 3 –

Introduction

5

TABLE 1

NORMAL

MILD

SEVERE

MODERATE
MODERATELY SEVERE

PROFOUND

Audiogram Showing Scale of Hearing Impairment*
Frequency in Hz

Hearing
Level (HL)
in dB
ANSI 1969

*Katz, J. “Handbook of Clinical Audiology,” Williams & Wilkins, 1985.

6

Screening Audiometry

The process of threshold and bone conduction testing can be time­consuming and costly in terms of equipment and personnel. Such
testing should be done in a soundproof room.

This is not practical for many people for detection purposes.
Therefore, many use a traditional audiometer but conduct a screen­ing audiometric test.

Generally, screening is conducted at 20 dB HL, 25 dB HL or
40 dB HL using the speech frequencies (500 Hz, 1000 Hz,
2000 Hz, 4000 Hz). Individuals who fail to respond at one or
more frequencies in either ear are then referred.

This type of hearing screening is often done in school systems at
several grade levels and by speech-language therapists in private
practice. RARELY IS SCREENING PERFORMED IN OTHER NEED­ED AREAS: in the physician’s office as part of a routine physical
examination; in each and every school grade; hospital admitting;
pediatric and ENT areas; nursing homes; high schools and col­leges; industrial areas; public health clinics; and health mainte­nance organizations.

The Welch Allyn AudioScope 3 provides a unique means for accu­rate and efficient early detection of hearing loss.

AudioScope 3 provides screening at the speech frequencies of 1000,
2000, 4000 and 500 Hz respectively, at a fixed decibel level. Choices
of decibel levels include: 20 dB HL, 25 dB HL and 40 dB HL. Prior to
the screening tones a practice tone or pretone (PT) is delivered at
1000 Hz and at 20 dB HL above the screening level.
For example:

When Screening at: The 1000 Hz Pretone is set at:

20 dB HL 40 dB HL
25 dB HL 45 dB HL
40 dB HL 60 dB HL

The pretone allows the patient to hear a test tone at a level which
is more audible than the screening level itself, thus allowing for
practice.

Screening Audiometry

7

Completing a Test

1. Before starting, check that the lens is centered in the instrument.

2. Select an area that is relatively quiet and free from distracting
conversation, fan noises, etc. (see p. 27 for allowable ambient
noise specifications).

3. Select a small, medium or large AudioSpec ear speculum. Use
the largest speculum that can be inserted comfortably into the
ear canal, yet still allow visualization of the tympanic membrane.
A snug fit assures an acoustic seal of the speculum in the ear
and occludes ambient noise. Secure the AudioSpec to
AudioScope 3 by twisting it clockwise onto the instrument.

NOTE: Use only gray-tipped Welch Allyn AudioSpecs.
Other types of specula will cause inaccurate results.

4. Turn AudioScope 3 “ON” by sliding the selection switch to the
desired screening level (20 dB HL, 25 dB HL, or 40 dB HL; see
p. 12 for guidelines). The white indicator band should completely
fill the square next to desired sound level. The green “READY”
indicator will become illuminated indicating that the instrument is
ready for service.

Should the yellow “LO BATT” indicator illuminate, see recharging
instructions (p. 17 - p. 18).

Step 1

Centering
the lens

Lens

Tone
Indicators

Pretone
Indicator

“READY”
Indicator

Start
Button

Charging
Jack

Step 4

Low Battery
Indicator

dB Level
and ON/OFF
Switch

8