Welch Allyn AM 232 User Manual

AM 232

TM

Manual Audiometer

Operating Instruction Manual

Part Number 1717-0101 - Rev. 05

12-16-08

1

Electromagnetic compatibility (EMC)

CE Mark per Medical Device Directive (93/42/EEC)

2

12-16-08

Table of contents

Electromagnetic compatibility (EMC) 2
Table of contents 3
Service and repair 5
Recalibration 5
Warranty 5
Rechargeable battery warranty 5
Safety notes 6
Specifications 7

Standards 7

Chapter 1

Introduction 9

Unpacking and inspection 10

Accessories supplied 10

Connectors, Controls, Indicators 11

Front panel controls and indicators (see Figure 1) 11
Rear panel connectors and indicators (see Figure 2) 12

Installation 14
Pretest procedure 15

Pretest noise recovery period 15
Elimination of ambient noise 16
Permissible noise levels 16

Disposal of non-contaminated electrical and electronic equipment
directive 2002-96-EC-WEEE 17

Chapter 2

Battery Option 19

NiCad BATTERY OPERATION 2 0
Recharging NiCad batteries 21
Replacing NiCad batteries 22
Alkaline battery installation/operation 23

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3

Chapter 3

Operation 25

Preliminary check 26
Instructing the subject 27
Placing the earphones 27
Response handswitch 27
Audiogram form 28
Routine calibration check 29
Routine test administration 30

HL control (F3) 30
Range Extension pushbutton (F2) 30
Tone Type Selector (F9) 30

Typical testing session 31

Pretest Review 31
Familiarization 31
Determining the threshold (Pure Tone) 32
Testing procedure 32

Chapter 4

Routine Maintenance 33

Calibration 34
Earphone cords 34
Hum and random noise 35
Distortion and frequency shift 35
Special messages 35

CAL 35
Exx 36

Bibliography 37

4

12-16-08

Service and repair

Technical Service Department Technical Service Department
Welch Allyn, Inc. Welch Allyn Canada Limited
4341 State Street Road 160 Matheson Boulevard, East
Skaneateles Falls, NY 13153-0220 Mississauga, Ontario, Canada L4Z 1V4
Tel.: [phone] (in U.S.A. only) Tel.: [phone] (in Canada only)

Recalibration

Welch Allyn recommends that the AM 232 Manual Audiometer be recalibrated
annually. Arrangements may be made by returning the instrument registration card or
by contacting Welch Allyn’s Technical Service Department (as listed above). A
moderate fee is charged for recalibration.

Warranty

Note: Return of the instrument registration card is required for proof of purchase
and warranty validation.

Welch Allyn, Inc. warrants the AM 232 Manual Audiometer to be free of original
defects in material and workmanship and to perform in accordance with
manufacturer’s specifications for a period of one year from the date of purchase. If
this instrument or any component thereof is found to be defective or a variance from
the manufacturer’s specifications during the warranty period, Welch Allyn will repair,
replace or recalibrate the instrument or component(s) at no cost to the purchaser.

This warranty only applies to instruments purchased new from Welch Allyn or its
authorized distributors or representatives. The purchaser must return the instrument
directly to Welch Allyn or an authorized distributor or representative and bear the
costs of shipping.

This warranty does not cover breakage or failure due to tampering, misuse, neglect,
accidents, modification or shipping, and is void if the instrument is not used in
accordance with manufacturer’s recommendations or if repaired or serviced by other
than Welch Allyn or a Welch Allyn authorized representative.

No other express or implied warranty is given.

Rechargeable battery warranty

Welch Allyn nickel-cadmium batteries are guaranteed by Welch Allyn for two years
from date of manufacture (when used in Welch Allyn instruments only). Defective
batteries will be replaced on a pro rata basis should failure occur prior to expiration
data on battery.

12-16-08

5

Safety notes

WARNING

!

with a hospital grade outlet. Injury to personnel or damage to equipment
can result when a three-prong or two-prong adapter is connected be­tween the AM 232 Manual Audiometer power plug and an AC outlet or
extension cord. Additionally, the AM 232 Manual Audiometer is equipped
with a specific power transformer which should not be interchanged with
any other transformer or supply.

This symbol indicates the location of a service adjustment part and

is intended for service personnel only. The AM 232 Manual Audiometer is
a specifically calibrated audiometer and the periodic service and adjust­ments for the instrument that may be required should be done only by an
authorized Welch Allyn service technician.

CAUTION

!

with the EMC requirements according to IEC 60601-1-2.

Radio transmitting equipment, cellular phones, etc. shall not be used in
the close proximity of the device since this could influence the perfor­mance of the device. Particular precaution must be considered during
use of strong emission sources such as High Frequency surgical equip­ment and similar device so that e.g., the HF-cables are not routed on or
near the device. If in doubt, contact a qualified technician or your local
representative. Refer to the Electromagnetic Compatibility (EMC) Guide
on CD 482-638702.

The AM 232 Manual Audiometer is designed to be used

The AM 232 Manual Audiometer is designed to comply

6

12-16-08

Specifications

Standards

The AM 232 Manual Audiometer meets ANSI S3.6 and IEC 645 Type 4 Audiometer
Standards.
UL 60601-1 Medical Electrical Equipment Requirements for Safety
IEC/EN 60601-1 General Requirements
CSA C22.2 No.601-1-M90

Protective Classification

This system is intended for continuous operation and has a protective classification
of Class II, Type B.

Class II Type B

Degree of protection against harmful ingress of water: Ordinary (no protection)

Frequency Range

Discrete Frequencies: 125, 250, 500, 750, 1000, 1500, 2000, 3000, 4000, 6000, 8000 Hz
Accuracy: ±3%
Total Harmonic Distortion: <2%

Intensity

Ranges: 125 Hz: -1 0 to 5 0 dB H L

500 to 6000 Hz: -10 to 9 0 dB HL
250 and 8000 Hz: -10 to 70 dB HL (Increments of 5 dB steps)

Note: A “+10” dB switch extends maximum at all frequencies by 10 dB.

Accuracy: 125 to 4000 Hz: ±3 dB

6000 to 8000 Hz: ±5 dB

Signal to Noise Ratio: >70 dB

Tone Type

Rise/Fall Time: 20-50 msec
Continuous: Steady when present bar depressed
Pulsed: 2.5 pulse/sec
FM: 5 Hz, ±5%

equipment symbols

Head set

Telephones TDH39 Earphones with MX41AR Cushions (60 ohm impedance).

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7

Power

Line Voltage: 100-240 V (±10%) Note: Desktop power supply
Range: 50-60 Hz (± 5%)
Consumption: 9 Watts

Battery

Types: Rechargeable (NiCad) or Non-Rechargeable (Alkaline)
Range: 7.0 V - 9.0 V
Capacity: NiCad - 22 hours continuous operations

Alkaline - 45 hours continuous operations

Environmental
Temperature:

Operating: 60° F to 105° F (15° C to 40° C)
Powerline Storage: -40° F to 140 ° F (-40° C to 60° C)
Battery Storage: -40° F to 105° F (-40° C to 40° C)
Humidity: 5% to 90%
Warm-up Time: 10 minutes for instruments stored at room temperature

Mechanical

Dimensions: 13.25" W x 14" D x 3.75" H

(33.66 cm x 35.56 cm x 9.53 cm)

Weight 5.6 lb (2.53 kg) net

8 lb (3.64 kg) shipping
10 lb (4.55 kg) shipping with battery included

Supplied Accessories Catalog Numbers

Test headset (TDH39) 23223
Audiogram Forms (1 pad of 50) 52300
Instruction Manual 232001
AC Power Module 8000-0246

Optional Accessories

Response Handswitch 23220
Patch Cord, 2 Conductor 23221
Audiocups 23222
Replacement NiCad Battery Only 72320
Battery Pack Assembly 72329

Battery Pack includes Welch Allyn supplied NiCad battery. May also be used
with six (6), Size C, Alkaline batteries (not included) Replacement NiCad

Catalog Listings

AM 232 Manual Audiometer, AC Power (USA) 23200
AM 232 Manual Audiometer, AC Power and Battery (USA) 23210
AM 232 Manual Audiometer , AC Power (Export) 23205
AM 232 Manual Audiometer, AC Power and Battery (Export) 23215

8

12-16-08

Chapter 1

Introduction

The AM 232 Manual Audiometer is a single-channel, pure tone, air conduction,
portable instrument designed to provide basic audiometric screening capability for
physicians’ offices, schools and industry. The lightweight design allows easy
transport to a variety of testing locations, and the built-in storage cavity and case
provide enough room to contain all instrument accessories. The clearly labeled front
panel controls and full frequency range make accurate, reliable testing a simple matter
for any user.

The AM 232 Manual Audiometer is a precisely designed and calibrated instrument.
With proper care it will deliver accurate sound-pressure levels to subject ears for your
hearing screening program.

Note: The AM 232 Manual Audiometer should be recalibrated yearly (or sooner if a
problem develops). See Chapter 4.

12-16-08

9

Unpacking and inspection

Although your AM 232 Manual Audiometer was carefully tested, inspected and
packed for shipping, it is good practice after receiving the instrument to immediately
examine the exterior of the container for any signs of damage. Notify your carrier if
any damage is noted.

Carefully remove your AM 232 Manual Audiometer from its shipping container. If
the instrument appears to have suffered mechanical damage, notify the carrier
immediately so that a proper claim can be made. Be certain to save all packing
materials so that the claim adjuster can inspect it as well. As soon as the carrier has
completed the inspection, notify your Welch Allyn representative.

If the instrument must be returned to the factory, repack it carefully (in the original
container if possible) and return it prepaid to the factory for necessary adjustments.
Check that all accessories itemized in Accessories supplied below are received in
good condition. If any accessories are missing, contact Welch Allyn immediately.
See the Specifications section for the catalog numbers of accessories and also for a
listing of optional accessories.

Accessories supplied

Test Headset Assembly (TDH39)
Audiogram Pad (1 pad of 50)
Battery Pack Assembly (used with #23210 and #23215 models only)
AC power cord

10

12-16-08

Connectors, Controls, Indicators

Figure 1: Front panel.

Front panel controls and indicators (see Figure 1)

F1 - Power switch and indicator for ON and OFF .

F2 - Range extension pushbutton allows you to increase the stimulus intensity 10 dB

above the standard maximum HL at any frequency. When in use, a “+” appears
on the LCD.

F3 - HL control for setting stimulus intensity level. Level is indicated on LCD.

F4 - Present bar for stimulus presentation.

F5 - Stimulus being presented via an earphone. Presentation indicated by illuminated

green LED.

F6 - Subject response indicator shows you when the test subject has pressed the

handswitch button by an illuminated green LED (with optional handswitch only).

F7 - Control for setting stimulus frequency. Frequency is indicated in the window

adjacent to the control.

F8 - Routing switch for stimulus presentation to the earphone. Left or right indicated

by illustration of subject.

F9 - Switch for setting the stimulus tone type.

FM = warble tone
__ = steady tone

- - - = pulsed tone

F10 - Low battery indicator to alert you of a limited operating time. Recharge or

replace batteries (dependent on whether NiCad or Alkaline batteries are used).

12-16-08

11

Rear panel connectors and indicators (see Figure 2)

Figure 2: Rear panel.

R1 - Power input jack (5-pin DIN Connector) with front panel illustration showing its

location and a rear panel label giving the input power specifications.

R2 -

R3 - Earphone output jacks (standard phone jacks). Front panel illustration shows

R4 - Response handswitch input jack (standard phone jack) with front panel illustra-

R5 - Entry by qualified service personnel only.

Note: The above symbol is located inside the storage compartment. It denotes a

Type B, Class II product per IEC 878 as referenced in IEC 60601-1.

Attention, consult accompanying document for instructions or warnings

!

pertaining to these parts.

left and right phone.

tion showing location.

12

12-16-08

Note: There is a symbol on the bottom panel (marked B1 in Figure 3) that indicates
entry by qualified service personnel only.

Figure 3 : Bottom panel.

12-16-08

13

Installation

1. Plug the power cord into the appropriate jack (R1) on the back panel of the

instrument.

2. Plug the other end into a line power (mains) outlet.

3. Plug the earphones into the earphone jacks (R3) on the rear panel. Note the

symbol along the top of the front panel, which indicates which is right (RED) and
which is left (BLUE).

4. Turn the power switch to ON.

Note: For battery operation, please refer to Chapter 2.

14

12-16-08

Pretest procedure

Note: The AM 232 is a versatile audiometer designed for use in doctor offices,
schools, industrial settings, the military, etc. The generic term “subject” used in this
manual is used to identify the person whose hearing is being evaluated.

Any program aimed at obtaining reliable records of hearing thresholds should be
staffed and supervised by appropriately-trained individuals. Training courses
leading to certification are available for audiometric technicians in most urban areas.

Two prerequisites are of particular importance to the procurement of reliable audio­grams:

• Prior to testing, allow adequate time for the subject to recover from the effects of

a previous exposure to high-level sound.

• Tests should be performed in a quiet area.

Pretest noise recovery period

Exposure to high levels of sound (unmuffled lawn mowers, power tools, loud music,
gunfire, etc.) tends to create a temporary threshold shift (TTS), which diminishes with
time after exposure. Any subject tested soon after such exposure may manifest a
hearing loss that does not reflect the subject’s normal hearing threshold. It is,
therefore, important that the testing procedure prescribe some time interval - usually
at least 16 hours - between the last exposure to high-level sound and the administra­tion of any hearing test.

12-16-08

15

Elimination of ambient noise

Excessive noise in the test environment such as that produced by conversation,
typewriters, or other machines also reduces test validity because it tends to mask the
test signals particularly at the lower frequencies where earphone cushions provide
less effective attenuation. An acoustically tested room may be required if ambient
noise at the subject’s ears reaches objectionable levels - i.e., sufficient to cause
apparent hearing loss at the low frequencies. Also, Audiocups are available from
Welch Allyn as an optional accessory. If the test subject is in the same room as the
audiometer, it is recommended that the subject be seated about 1 meter (-3 ft) away
from the instrument.

Maximum permissible test environment sound-pressure levels are specified by
American National Standard Criteria for Permissible Background Noise during
Audiometric Testing, S3.1-1977 (revised). Table 2 shows the maximum background
levels that can be present inside the room while a valid hearing test is being con­ducted. For more comprehensive information about hearing testing and hearing
conservation, refer to the Bibliography.

Permissible noise levels

Test Tone Frequency (Hz) 12 5 25 0 50 0 75 0 1000 1500 2000 3000 4000 6000 8000

Test Room

Test Room

* 34.0 22.5 19.5 21.5 26.5 26.5 28.0 33.5 34.5 38.0 43.5
** 29.0 17.5 14.5 16.5 21.5 21.5 23.0 28.5 29.5 33.0 38.5

*Ears covered maximum permissible octave band levels.
**Ears covered maximum permissible one-third octave band levels.

16

12-16-08

Disposal of non-contaminated electrical and
electronic equipment directive 2002-96-EC-WEEE

English Do not dispose of this product as unsorted municipal waste. Prepare this product for reuse or separate collection as

ý

esky Tento výrobek nelikvidujte s netĜídČným domovním odpadem. PĜipravte ho k novému použití nebo do sbČru

Dansk Produktet må ikke bortskaffes som usorteret husholdningsaffald. Produktet skal forberedes til genbrug eller særskilt

Deutsch Dieses Produkt darf nicht mit unsortiertem Hausmüll entsorgt werden. Bereiten Sie dieses Produkt zur

Español No deseche este producto como residuos municipales sin clasificar. Prepare este producto para su reutilización o

Eesti keeles Ärge vabanege antud tootest kui sorteerimata olmejäätmest. Valmistage toode ette korduvkasutamiseks või

ǼȜȜȘȞȚțȐ ȂȘȞ ĮʌȠȡȡȓʌIJİIJİ IJȠ ʌȡȠȧȩȞ ıIJĮ țȠȚȞȐ įȘȝȠIJȚțȐ ĮʌȠȡȡȓȝȝĮIJĮ. ȆȡȠİIJȠȚȝȐıIJİ IJȠ ʌȡȠȧȩȞ ȖȚĮ İʌĮȞĮȤȡȘıȚȝȠʌȠȓȘıȘ Ȓ

Français Ne mettez pas au rebus ce produit avec les ordures ménagères non triées. Préparez-le en vue d'un recyclage ou d'une

specified by Directive 2002/96/EC of the European Parliament and the Council of the European Union on Waste
Electronic and Electrical Equipment (WEEE). If this product is contaminated, this directive does not apply.

For more specific disposal information, see www.welchallyn.com/weee, or contact Welch Allyn Customer Service at
[phone].

Č

separovaného odpadu podle sm
elektronických a elektrických za
kontaminován, tato sm

Podrobn

Č

jší smČrnice o likvidaci najdete na adrese www.welchallyn.com/weee nebo zavolejte oddČlení služeb

Ĥ

spoleþnosti Welch Allyn na þísle [phone].

zákazník

indsamling som angivet i Europa-Parlamentets og Rådets Direktiv 2002/96/EF om affald af elektrisk og elektronisk
udstyr (WEEE). Hvis produktet er kontamineret, gælder Direktivet ikke.

Yderligere oplysninger om bortskaffelse fås på www.welchallyn.com/weee eller ved at kontakte Welch Allyn
Kundeservice på [phone]

Wiederverwertung oder zur getrennten Sammlung entsprechend der Richtlinie 2002/96/EG des Europäischen
Parlaments und des Rats der Europäischen Union über Elektro- und Elektronik-Altgeräte (WEEE-Richtlinie) vor. Diese
Richtlinie gilt nicht bei Kontamination des Produkts.

Detailliertere Informationen zur Entsorgung finden Sie unter www.welchallyn.com/weee bzw. erhalten Sie beim
Kundendienst von Welch Allyn unter der Telefonnummer [phone]

recogida selectiva como se especifica en la Directiva 2002/96/CE del Parlamento Europeo y el Consejo sobre
residuos de aparatos eléctricos y electrónicos (RAEE). Si este producto está contaminado, no se aplica esta directiva.

Para obtener información más específica sobre los desechos, consulte www.welchallyn.com/weee o póngase en
contacto con el servicio de atención al cliente de Welch Allyn llamando al [phone].

lahuskogumiseks, nii nagu on kindlaks määratud Euroopa Parlamendi ja nõukogu direktiivis 2002/96/EÜ elektri- ja
elektroonikaseadmete jäätmete kohta. Kui toode on reostunud, siis nimetatud direktiiv ei kohaldu.

Täpsemat teavet jäätmekõrvaldamise kohta saab www.welchallyn.com/weee või võtke ühendust Welch
Allyn‘ klienditeenindusega telefonil [phone].

ȟİȤȦȡȚıIJȒ ıȣȜȜȠȖȒ ĮʌȠȡȡȚȝȝȐIJȦȞ ȩʌȦȢ țĮșȠȡȓȗİIJĮȚ ıIJȘȞ ȅįȘȖȓĮ
IJȠȣ ȈȣμȕȠȣȜȓȠȣ IJȘȢ ǼȣȡȦʌĮȧțȒȢ DzȞȦıȘȢ ıȤİIJȚțȐ μİ IJĮ ĮʌȩȕȜȘIJĮ İȚįȫȞ ȘȜİțIJȡȚțȠȪ țĮȚ ȘȜİțIJȡȠȞȚțȠȪ İȟȠʌȜȚıμȠȪ

ǹǾǾǼ

). ǹȞ

(

īȚĮ ʌİȡȚııȩIJİȡİȢ ʌȜȘȡȠijȠȡȓİȢ ıȤİIJȚțȐ ȝİ IJȘȞ ĮʌȩȡȡȚȥȘ, ȝİIJĮȕİȓIJİ ıIJȘȞ ȚıIJȠıİȜȓįĮ
İʌȚțȠȚȞȦȞȒıIJİ ȝİ IJȘȞ ǼȟȣʌȘȡȑIJȘıȘ ȆİȜĮIJȫȞ IJȘȢ

collecte séparée, comme stipulé par la Directive 2002/96/EC du Parlement européen et du Conseil de l'Union
européenne sur les déchets d'équipements électroniques et électriques (WEEE). Cette directive ne s'applique pas si le
produit est contaminé.

Pour des informations plus spécifiques sur la mise au rebus, visitez le site www.welchallyn.com/weee, ou contactez le
service clientèle Welch Allyn au [phone].

ĮȣIJȩ IJȠ ʌȡȠȧȩȞ İȓȞĮȚ ȝȠȜȣıȝȑȞȠ, Ș ʌĮȡĮʌȐȞȦ ȠįȘȖȓĮ įİȞ ȚıȤȪİȚ

rnice Evropského parlamentu a Rady Evropské unie þíslo 2002/96/EC o likvidaci

Ĝ

ízení (Waste Electronic and Electrical Equipment, WEEE). Pokud je výrobek

Č

rnice pro nČj neplatí.

Welch Allyn

2002/96/ǼȀ

ıIJȠ IJȘȜȑijȦȞȠ

IJȠȣ ǼȣȡȦʌĮȧțȠȪ ȀȠȚȞȠȕȠȣȜȓȠȣ țĮȚ

.

www.welchallyn.com/weee Ȓ

[phone].

12-16-08

17

Italiano Non smaltire questo prodotto con i normali rifiuti. Approntare il prodotto per il riutilizzo oppure smaltirlo in modo

Lietuviǐ k. Neišmeskite šio gaminio kartu su nernjšiuotomis miesto atliekomis. Paruoškite šƳ gaminƳ pakartotinam naudojimui ar

Magyar Ne dobja ki a terméket a települési vegyes hulladékgyĦjtĘbe. A terméket az újrafelhasználási vagy egyéb, speciálisan

Nederlands Dit product mag niet worden weggegooid bij niet-gesorteerd huishoudelijk afval. Het product moet worden

Norsk Produktet skal ikke kastes som restavfall. Produktet skal leveres for gjenbruk eller som spesialavfall i henhold til

Polski Nie naleĪy wyrzucaü tego produktu razem z nieposortowanymi odpadami komunalnymi. NaleĪy przygotowaü go do

Português Não elimine este produto como lixo urbano indiferenciado. Prepare este produto para reutilização ou recolha

Suomi Älä hävitä tätä tuotetta lajittelemattoman yhdyskuntajätteen mukana. Tuote on kierrätettävä tai vietävä erilliseen

Svenska Kassera inte denna produkt som osorterat kommunalt avfall. Förbered denna produkt för återanvändning eller särskild

differenziato, in base a quanto stabilito dalla Direttiva 2002/96/EC del Parlamento Europeo e del Consiglio dell'Unione
Europea in materia di smaltimento delle apparecchiature elettriche ed elettroniche (WEEE). Se il prodotto è
contaminato, tale direttiva non viene applicata.

Per ulteriori informazioni sui metodi di smaltimento, visitare il sito Web all'indirizzo www.welchallyn.com/weee oppure
contattare l'assistenza clienti Welch Allyn al numero [phone].

ơ

surinkimui atskirai, kaip nurodyta Europos Parlamento ir Tarybos direktyvoje 2002/96/EB d

Ƴ

rangos atliekǐ (EEƲA). Jei gaminys yra užkrơstas, direktyva jam netaikoma.

Nor

ơ

dami gauti daugiau specifinơs informacijos, žr. www.welchallyn.com/weee, arba susisiekite su Welch Allyn

ǐ

aptarnavimo skyriuje [phone].

Klient

ĦjtĘ

ilyen célokra kijelölt gy
berendezésekb

ĘzĘ

dött, az említett irányelv rendelkezései nem vonatkoznak a kidobására.

befert

A hulladékkezeléssel kapcsolatos részletes tájékoztatást megtalálhatja a www.welchallyn.com/weee webhelyen,
illetve érdekl

geprepareerd voor hergebruik of gescheiden inzameling conform de richtlijn 2002/96/EC van het Europees parlement
en de Raad van de Europese Unie inzake de verwerking van elektrisch en elektronisch afval (WEEE - Waste
Electronic and Electrical Equipment). Deze richtlijn is niet van toepassing indien het product is verontreinigd.

Ga voor specifieke instructies voor afvalverwijdering naar www.welchallyn.com/weee, of neem contact op met de
klantenservice van Welch Allyn op het nummer [phone]

Europaparlamentets og EU-rådets direktiv 2002/96/EF om avfall fra elektronisk og elektrisk utstyr (WEEE). Hvis
produktet er forurenset, gjelder ikke dette direktivet.

Se www.welchallyn.com/weee eller kontakt Welch Allyn kundeservice på [phone] for nærmere opplysninger
om avfallshåndtering.

ponownego wykorzystania lub rozdzieli
Europejskiego i Rady w sprawie zu
Electrical Equipment). Ta dyrektywa nie ma zastosowania, je

Szczegółowe informacje na temat usuwania mo
biurze obsługi klienta firmy Welch Allyn pod numerem [phone]

diferenciada em conformidade com a Directiva 2002/96/EC do Parlamento Europeu e do Conselho da União Europeia
sobre Reciclagem de Resíduos Eléctricos e Electrónicos (WEEE). Se este produto estiver contaminado, esta directiva
não será aplicável.

Para obter informações mais específicas sobre a eliminação de resíduos, consulte www.welchallyn.com/weee ou
contacte Welch Allyn Customer Service no número [phone]

keräyspisteeseen Euroopan parlamentin ja neuvoston antaman sähkö- ja elektroniikkalaiteromua koskevan direktiivin
2002/96/EY mukaisesti. Jos tuote on saastunut, direktiivi ei koske sitä.

Lisätietoja tuotteiden hävittämisestä saa käymällä osoitteessa www.welchallyn.com/weee tai ottamalla yhteyttä Welch
Allynin asiakaspalveluun, puh. [phone].

insamling enligt Europaparlamentets och rådets direktiv 2002/96/EG om avfall som utgörs av eller innehåller elektriska
eller elektroniska produkter (WEEE). Om denna produkt är kontaminerad gäller inte detta direktiv.

Gå in på www.welchallyn.com/weee eller kontakta kundtjänsten hos Welch Allyn på [phone] för mer information
om kassering.

Ę

dhet a Welch Allyn ügyfélszolgálatánál a [phone]-es számon.

helyen kell leadni, az Európai Parlament és a Tanács elektromos és elektronikai

Ę

l származó hulladékról (WEEE) szóló, 2002/96/EK számú irányelvének megfelelĘen. Ha a termék

ü

jego elementy, zgodnie z Dyrektywą nr 2002/96/WE Parlamentu

Ī

ytego sprzĊtu elektrycznego i elektronicznego (WEEE, Waste Electronic and

Ī

Ğ

li produkt jest skaĪony.

na znaleĨü na stronie www.welchallyn.com/weee lub uzyskaü w

l elektros ir elektroninơs

18

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Chapter 2

Battery Option

This chapter describes the battery option of the AM 232 Manual Audiometer. It
pertains only to those customers who purchased Models #23210 or #23215 with the
battery pack installed or to those who later purchased the #72329 Battery Pack
Assembly. In both cases, a rechargeable NiCad battery is included.

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19

NiCad BATTERY OPERATION

The AM 232 Manual Audiometer battery option is supplied with an installed,
rechargeable NiCad battery pack. It requires about 18 hours to charge fully, which will
provide about 22 hours of continuous operation. The green LED on the pack itself
illuminates when charging is in progress. The words LO BAT illuminates on the front
panel LCD when the battery charge is getting low, alerting you to recharge the
batteries. When LO BAT appears, the instrument will operate (continuously) for
about two more hours before it shuts down completely.

Note: In no instance will loss of battery power affect the instrument calibration.

To save battery life, the AM 232 Manual Audiometer has a special “Sleep Mode” in
which the instrument will shut down after 5 minutes of no operation. You will know
the instrument is “asleep” because the LCD will show three dash lines (- - -). To
“wake up” the instrument, press the Present bar. There is no danger of presenting a
loud tone to the test subject when the instrument “wakes up” because no tone is
presented until the Audiometer is awake. In addition, the instrument automatically
resets its output to 0 dB HL.

If the AM 232 Manual Audiometer is operated until the battery charge has dropped
below an acceptable voltage level, the instrument will cease to function. The display
will be blank except for the LO BAT indication, and the controls will cease to
function. To restore operation, the batteries must be recharged for some period of
time, up to 18 hours (full charge), or line power (mains) may be used. If the Audiom­eter is operated off of line power (mains) with the rechargeable batteries in place,
some battery charging will occur.

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Recharging NiCad batteries

Figure 1: Recharging the NiCad battery.

Refer to Figure 1 when recharging NiCad batteries and proceed as follows:

a. Be certain that the battery pack power cord is connected to the power cord

receptacle on the back panel of the audiometer - ( A )

b. Connect the instrument power cord to the receptacle on the lower edge of the

battery pack - ( B ).

c. Plug the power cord into a wall outlet.

CAUTION

!

will occur if the pack is left charging for more than the 18 hours required
for a full charge, the batteries should not be left charging for extended
periods several days) because the useful life of the rechargeable NiCad
pack will be shortened. Welch Allyn recommends unplugging the battery
pack power input cord from the back of the audiometer and plugging the
main line power cord into the jack if main line power is to be used most
of the time.

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Although no damage to the rechargeable NiCad batteries

21

Replacing NiCad batteries

Please refer to Figures 2, 3, 4 below and proceed as follows:

1. Unplug the AM 232 Manual Audiometer from the line power (mains).

2. Remove the two screws on the battery pack cover and lift off the cover.

3. Pull the NiCad battery out of the pack. The battery is actually a set of 6 batteries
wrapped in plastic, but they will be removed as a single unit.

Figure 2: Figure 3: Figure 4:
Removing the battery cover Removing the battery pack Internal view of the

battery compartment

4. Carefully disconnect the lead wires of the NiCad battery from the battery compart­ment by removing the small connector.

5. Remove the NiCad battery pack.

6. Attach the lead wire connector on the new NiCad battery to the mating connector
in the battery pack base.

7. Place the new NiCad into the battery pack.

8. Replace the battery pack cover. There is only one way that the cover can be
replaced and the screws tightened. Note that the screw housing is longer on one
end. Orient the top cover so that it will sit flat on the top of the battery compart­ments and replace screws.

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Alkaline battery installation/operation

For longer continuous battery operation, such when recharging on a regular basis is
not possible, the rechargeable batteries can be replaced with six size C alkaline
batteries. These batteries will provide about 45 hours of continuous operation.

The low voltage indicator operates the same way for alkaline batteries as it does for
NiCad batteries. The words LO BAT appears on the LCD when about 6 hours of
continuous battery operation remains. In addition, the “sleep mode” also works with
the alkaline batteries to prolong their useful life.

To install the alkaline batteries, refer to figures 2, 3 and 4 on the previous page, and
proceed as follows:

1. Unplug the AM 232 Manual Audiometer from the line power (mains).

2. Remove the two screws on the battery pack cover and lift off the cover.

3. Pull the NiCad battery out of the pack. The battery is actually a set of 6 batteries
wrapped in plastic, but they will be removed as a single unit.

4. Carefully disconnect the lead wires of the NiCad battery from the battery compart­ment by removing the small connector.

5. Remove the NiCad pack.

6. There are six spring mounts on the top and bottom of the battery compartment to
hold the alkaline batteries and the label on the bottom surface of the compartment
indicates the correct position for each battery. Place each one of the six batteries
into the pack matching the polarity ( + or - ) as shown on the label.

7. Replace the battery pack cover. Make sure the cover is positioned such that the
spring mounts touch the batteries. There is only one way that the cover can be
replaced and the screws tightened. Note that the screw housing is longer on one
end. Orient the top so that it will sit flat on top of the battery compartment and
replace screws.

Note: If the alkaline batteries are not going to be used on a regular basis, they
should not be stored in the audiometer. They should be removed from the battery
pack and stored in a cool, dry place.

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23

Blank page.

24

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Chapter 3

Operation

Throughout this chapter are references to front panel (F) and rear panel (R) connec­tors, controls and indicators. Please refer to Connectors, Controls and Indicators
and Figures 1 and 2 in Chapter 1 of this manual for specific descriptions and loca­tions.

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25

Preliminary check

1. Prior to testing, ensure that the power cord and earphone cords are plugged in

(R1 and R3 respectively).

2. Turn the audiometer on.

3. Select the desired tone type (F9 - pulsed, steady or FM).

4. Make whatever notations your procedure requires on the audiogram form.

CAUTION

!

them to be squeezed together. Severe mechanical shock may change their operating
characteristics and require their replacement.

IMPORTANT: Always clean and maintain your earphone cushions, for hygiene
purposes. Check periodically for cracking or signs of wear. Cleanse cushions
daily or after each use (depending upon population being tested). Use a
solution of diluted alcohol or mild soap and water, taking care not to get any of
the cleaning solution into the earphone speaker. Use earphones only when
completely dry. Insert the earphone cords between the earphone cushions
during storage to prevent damage from mechanical shock.

Always handle earphones with care. Neither drop them nor permit

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Instructing the subject

You should put the subject as much at ease as possible before the test begins. In
addition, you should try to make the subject understand how the test is to be
conducted and what the subject will hear. For the sake of uniformity, an unvarying
explanation is advisable - something similar to the following:

“I am going to place these earphones over your ears. You will hear a variety of
tones - some high, some low, some loud, some very soft. Whenever you hear, or think
you hear one of these sounds, raise you hand. Lower your hand when you no longer
hear the sound.

Remember that though some of the tones will be easy to hear, others will be very
faint. Therefore, you should listen very carefully and raise your hand whenever you
think you hear the tone.”

Modify the instructions accordingly if the optional response handswitch is to be
used.

Placing the earphones

The most important thing to remember is that a good seal is required between the
earphone cushion and the subject’s head and ear. To increase the likelihood of a
good seal:

a. Eliminate all obstruction between earphone and subject (hair, eyeglasses,

earrings, hearing aids, etc.).

b. Adjust the headband so that it rests solidly on the crown of the subject’s head

and exerts firm pressure on both ears.

c. Center earphones carefully over both ears, earphone with red connector on right

ear. Take care to eliminate any visible gaps between earphone cushions and
portions of the subject’s head and the ear on which the cushion rests.

Response handswitch

If the optional response handswitch is to be used insure that the plugs and jacks are
properly connected. The AM 232 Manual Audiometer front panel indicator will be
illuminated when the subject presses the response button.

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27

Audiogram form

The AM 232 Audiogram form (see Figure 1) consists of three distinct parts:

• Space for entering information about the person to be tested.

• A convenient chart for manually plotting test data.

• Space for entering comments about the subject or the test.

28

Figure 1: Audiogram Form

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Routine calibration check

It is good practice to make and file, at the start of each month’s testing, the audiogram
of a single subject or of a small group of subjects who are likely to be routinely
available for this purpose. Where physical arrangements permit, you can serve as a
subject.

This procedure should be performed when the Audiometer is installed, and be
performed each month thereafter. If the AM 232 Manual Audiometer is to be used to
monitor employee thresholds as part of an industrial Hearing Conservation Program,
this “biological listening check” must be done at the beginning of each day the
audiometer is to be used (per CFR 1910.95 Occupational Noise Exposure, March 8,

1983).

Since individual thresholds can shift up or down as much as 5 dB from one day to the
next, variation within this range may be considered acceptable. Variations that exceed
this range, however, are likely to reveal problems that require attention. The routine
maintenance checks described in Chapter 4, may suggest the source and solution to
the problem. If they do not, the instrument should receive technical service by a
certified technician before further use.

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29

Routine test administration

HL control (F3)

The HL control increases or decreases the presented intensity in 5 dB HL steps with
the currently available intensity displayed on the LCD. Rotating the Control knob
clockwise increases the intensity; counterclockwise decreases intensity. When the
maximum or minimum available intensity is reached for any frequency, the display will
flash to alert you that the available range can not be exceeded.

Range Extension pushbutton (F2)

This control allows the operator to present tones of up to 10 dB above the standard
maximum HL at any frequency. It will only function when the intensity is set within 10
dB below the maximum standard intensity at any frequency. This feature requires an
extra step to access or use the highest available intensities, requiring the operator to
make note of those individuals requiring testing at these levels. It also prevents
accidental presentation of the highest intensities to normal subjects, and it alerts the
operator to present the stimulus for only brief periods of time.

To enable the range extension feature, press the button labeled +10 dB. Note that a
“+” sign appears on the LCD. To disable the feature, either press the button a second
time, reduce the intensity (with the HL control knob) to 20 dB below the standard
maximum HL or change any other parameter (Frequency or Routing).

Tone Type Selector (F9)

This control allows you to choose the type of tone presented to the test subject. It
can be set on steady, pulsed (2.5 pulses per second) or FM (warble tone).

Pulsed tones and warble tones are often used with difficult to test subjects, such as
children and hard of hearing individuals, because they hold the subject’s attention
better than the steady tone.

30

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Typical testing session

Pretest Review

1. Turn the instrument on.

2. Check that the earphones are operating properly.

3. Seat subject comfortably in the test area.

4. Explain the test procedure.

5. Assist subject with the earphones.

6. Select the desired tone type.

7. Make appropriate entry on the subject’s audiogram.

Familiarization

1. Set the Routing selector to route the test tone to the selected ear.

2. Demonstrate the 1000 Hz tone at a 40 dB level. The Tone Duration should be
between 1 and 2 seconds.

3 Set the HL control to -10 dB.

4. Practice: Beginning with the tone on continuously (Present Bar held down),
gradually increase the intensity by turning the HL control until a response
occurs. Switch the tone off for at least two seconds and present the tone again at
the same level. If there is a second positive response, proceed to threshold
measurement. If a second response does not occur, repeat this step. Practice is
preliminary to threshold measurement determination and is to be completed at
each new frequency setting.

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31

Determining the threshold (Pure Tone)

1. The level of the first presentation shall be 10 dB below the level at which the
subject responded during the familiarization procedure. Present the tone for a
period of one or two seconds. Time between tones can be varied, but not shorter
than the duration of the test tone itself. After each failure to respond to a signal,
the level is increased by 5 dB until the first response occurs. After the response,
the intensity is decreased 10 dB and another ascending series is begun.

Note: Down 10 dB, Up 5 dB

2. The threshold is considered to be the minimum dial setting at which a response
has occurred two out of three times. Record this setting on the audiogram form.

Testing procedure

1. Repeat the Familarization and Determining the threshold (Pure Tone) proce­dures for each tone-setting in the following order: 1000, 2000, 3000, 4000, 6000,
and 8000 Hz.

2. Retest 1000 followed by 500 and 250.

If there is a difference of 20 dB or more between two successive octaves, test the
inter-octave responses (i.e., 750, 1500, 3000 Hz). Record this information on the
audiogram form.

3. Repeat Familarization, Determining the threshold (Pure Tone) and Testing
procedure for the other ear.

32

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Chapter 4

Routine Maintenance

12-16-08

33

Calibration

The biological listening check, or routine calibration check, should be performed at
least monthly. (See Routine calibration check in Chapter 3).

The following checks should be made at periodic intervals, even if routine calibration
checks do not reveal any problems. These procedures presuppose normal hearing on
the part of the person doing the checking.

Earphone cords

With extended use, earphone cords tend to fray internally at the junctions of both
earphone and audiometer connectors. This fraying will ultimately either decrease the
signal level in the associated earphone or cause signals to be intermittent as the cord
is flexed.

To check for either condition:

1. Set the Audiometer frequency control (F7) to 1000 or 2000 Hz.

2. Set the HL control (F3) at a comfortable audible level.

3. Press the Present bar (F4) and flex earphone cord next to plug at both ends,
listening for intermittent signal, abrupt changes in signal level, or a scratchy
sound superimposed over the signal that coincides with the flexing of the cord.
The presence of any of these three conditions signifies that the cord should be
replaced.

4. Repeat the test for the other earphone.

34

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Hum and random noise

This test can be made during the check for attenuator noise. With the instrument set
on 1000 Hz, move the HL control (F3) from 0 to 60 dB and listen for low-frequency
hum (60 to 120 Hz) and random noise (hiss or low rushing sound) at all attenuator
levels. Some audible random noise at levels above 60 dB is permissible. Below 60 dB,
however, only the signal should be audible. Any of these noises can be confused
with the signal by naive subjects and affect the accuracy of the audiogram. Schedule
the audiometer for immediate service if any of the three is detected.

Distortion and frequency shift

This check can be best made by listening to the output of the AM 232 Manual
Audiometer through the earphones while presenting all 11 frequencies at a loud, but
not uncomfortable, level (70 to 80 dB HL for normal ears.)

Listen for rattling, rasping or distortion in the tones presented. Listen also to ascer­tain that signal frequencies change plausibly when the frequency selector (F7) is
moved to a new position. If distortion is heard in one earphone but not in the other,
the chances are high that the earphones are at fault and should be replaced. In any
case, the audiometer should be scheduled for immediate maintenance.

Special messages

The AM 232 Manual Audiometer performs a self-check each time the instrument is
turned on (the self-check does not occur when instrument operation resumes from the
“sleep mode”). Certain messages will be displayed on the front panel LCD if any error
in the instrument operation is detected. These messages are described below.

CAL

When a transducer or frequency is selected that has a calibration error (e.g., right
earphone at 2000 Hz), the word “CAL” will be displayed. The audiometer will not
function at this frequency with this transducer, so no invalid results can be recorded.
The word “CAL” will be displayed as long as the erroneous transducer and fre­quency settings are selected. If the calibration error is an isolated situation, changing
either the frequency or the transducer (e.g., left earphone at 3000 Hz) will restore
normal instrument function.

As in the case with any instrument malfunction, a certified service technician should
be contacted immediately. Remember to make note of the combination of transducer
and frequency that cause the “CAL” message.

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35

Exx

When an error code consisting of an “E” and a two digit number xx = number)
appears on the audiometer’s display, a system error has been detected. The AM 232
Manual Audiometer will enter a “lockout” mode which will not permit the instrument
to operate. The specific error code will remain on the display for several seconds,
then the instrument will shut itself down completely. Should an Exx appear on the
LCD, take the following steps:

1. Power down, power up again. This could be only a temporary failure and may
never appear again. However, should the Exx message appear again, proceed to
steps b and c.

a. Write down the numbers displayed on the display.

b. Contact your certified service representative and give them the numbers you

recorded.

36

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Bibliography

American National Standard Specifications for Audiometers (ANSI S3.6 - 1989)

Criteria for Permissible Ambient Noise During Audiometric Testing (ANSI S3.1 - 1977)

Methods for Manual Pure-Tone Threshold Audiometry (ANSI S3.21 - 1978)

Michael, P.L., and Bienvenue, G.R., “Noise Attenuation Characteristics of Supra­Aural Audiometric Headsets Using the Models MX41/AR and 51 Earphone Cush­ions,” J. Accoust. Soc. Am., 70(5), Nov. 1981, 1235-1238

Newby, H.A., Audiology (4th ed.), New Jersey: Prentice-Hall Inc. (1979)

U.S. Department of Labor, Occupational Noise Exposure, CFR 1910.95, March 8, 1983

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37

Blank page.

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